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Wang D, Su N, Wang R, Zhang L, Qi Z, Liu Z, Yang J, Leng J, Xiang Y. Serous surface papillary borderline ovarian tumors: correlation of sonographic features with clinic pathological findings. Ultrasound Obstet Gynecol 2024; 63:691-698. [PMID: 37592848 DOI: 10.1002/uog.27454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 07/23/2023] [Accepted: 08/04/2023] [Indexed: 08/19/2023]
Abstract
Serous surface papillary borderline ovarian tumor (SSPBOT) is a distinct subtype of serous borderline ovarian tumor characterized by solid tissue deposition confined to the ovarian surface. Because SSPBOT is rare, there are few published reports on the ultrasonographic features of this condition. In this retrospective study, we investigated 12 cases of SSPBOT. Ultrasound imaging of SSPBOT showed grossly normal ovaries that were encased partially or wholly by tumor deposits that were confined to the surface, with clear demarcation between normal ovarian tissue and surrounding tumors. Color Doppler imaging demonstrated the 'fireworks sign' in all cases of SSPBOT, corresponding to an intratumoral vascular bundle originating from the ovarian vessels and supplying hierarchical branching blood flow to the surrounding tumor. No patient with ovarian high-grade serous carcinoma showed these morphological and Doppler features. In our series, the fireworks sign appeared to be a characteristic feature of SSPBOT that could facilitate correct identification of this tumor. © 2023 International Society of Ultrasound in Obstetrics and Gynecology.
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Affiliation(s)
- D Wang
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Obstetric and Gynecologic Diseases, Beijing, People's Republic of China
| | - N Su
- Department of Ultrasound, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - R Wang
- Department of Ultrasound, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - L Zhang
- Department of Ultrasound, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Z Qi
- Department of Ultrasound, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - Z Liu
- Department of Ultrasound, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China
| | - J Yang
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Obstetric and Gynecologic Diseases, Beijing, People's Republic of China
| | - J Leng
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Obstetric and Gynecologic Diseases, Beijing, People's Republic of China
| | - Y Xiang
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, National Clinical Research Center for Obstetric and Gynecologic Diseases, Beijing, People's Republic of China
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Gao Q, Luo N, Liang M, Zhou W, Li Y, Li R, Hu X, Zou T, Wang X, Yu J, Leng J, Chen H. A Stepwise Multivariate Granger Causality Method for Constructing Hierarchical Directed Brain Functional Network. IEEE Trans Neural Netw Learn Syst 2024; 35:4974-4984. [PMID: 36099216 DOI: 10.1109/tnnls.2022.3202535] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The directed brain functional network construction gives us the new insights into the relationships between brain regions from the causality point of view. The Granger causality analysis is one of the powerful methods to model the directed network. The complex brain network is also hierarchically constructed, which is particularly suited to facilitate segregated functions and the global integration of the segregated functions. Therefore, it is of great interest to explore new approach to model the hierarchical architecture of the directed network. In the present study, we proposed a new approach, namely, stepwise multivariate Granger causality (SMGC), considering both the directed and hierarchical features of brain functional network to explore the stepwise causal relationship in the network. The simulation study demonstrated that the diverse and complex hierarchical organization could be embedded in the apparently simple directed network. The proposed SMGC method could capture the multiple hierarchy of the directed network. When applying to the real functional magnetic resonance imaging (fMRI) datasets, the core triple resting-state networks in human brain showed within-network directed connections in the first-level directed network and rich and diverse between-network pathways in the second-level hierarchical network. The default mode network (DMN) had a prominent role in the resting-state acting as both the causal source and the important relay station. Further exploratory research on the adaption of directed hierarchical network in athletes suggested the enhanced bidirectional communication between the DMN and the central executive network (CEN) and the enhanced directed connections from the salience network (SN) to the CEN in the athlete group. The SMGC approach is capable of capturing the hierarchical architecture of the brain directed functional network, which refreshes the new stepwise causal relationship in the directed network. This might shed light on the potential application for exploring the altered hierarchical organization of brain directed network in neuropsychiatric disorders.
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Li Y, Zhang F, Liu Y, Leng J. A Tailorable Series of Elastomeric-To-Rigid, Selfhealable, Shape Memory Bismaleimide. Small 2024; 20:e2307244. [PMID: 37997160 DOI: 10.1002/smll.202307244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/09/2023] [Indexed: 11/25/2023]
Abstract
In recent years, there has been rapid development in the field of shape memory materials with active deformation performance. However, bismaleimide, a widely used thermosetting material in aerospace, has been largely overlooked in shape memory applications. This work presents the synthesis of a molecule containing an alkene bond adjacent to an oxygen atom. Through molecular design, a one-time reaction between this specialized molecule and the bismaleimide molecule is successfully achieved, facilitated by the steric hindrance effect. Therefore, a new series of shape memory bismaleimide materials are obtained. By introducing a diamine to adjust the chain length, the properties of material are further improved, resulting in increasing static modulus by 506 times. The synthesized materials exhibit a broad glass transition temperature (Tg) range exceeding 153 °C, remarkable stiffness tunability. Notably, in the synthesis process of this materials series, the disulfide bonds are introduced, which facilitates the realization of self-healing and reprocessable functionalities in the resulting thermosetting materials. This significant advancement lays a solid foundation for the future recycling and reuse of aircraft, satellites, and other equipment, offering promising prospects for enhancing sustainability and efficiency within the aerospace industry.
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Affiliation(s)
- Yuejia Li
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No.2 Yikuang Street, P.O. Box 3011, Harbin, 150080, P. R. China
| | - Fenghua Zhang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No.2 Yikuang Street, P.O. Box 3011, Harbin, 150080, P. R. China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), No. 92 West Dazhi Street, P.O. Box 301, Harbin, 150001, P. R. China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No.2 Yikuang Street, P.O. Box 3011, Harbin, 150080, P. R. China
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Huo J, Yu J, Wang M, Yi Z, Leng J, Liao Y. Coexistence of Cyclic Sequential Pattern Recognition and Associative Memory in Neural Networks by Attractor Mechanisms. IEEE Trans Neural Netw Learn Syst 2024; PP:1-12. [PMID: 38442060 DOI: 10.1109/tnnls.2024.3368092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
Neural networks are developed to model the behavior of the brain. One crucial question in this field pertains to when and how a neural network can memorize a given set of patterns. There are two mechanisms to store information: associative memory and sequential pattern recognition. In the case of associative memory, the neural network operates with dynamical attractors that are point attractors, each corresponding to one of the patterns to be stored within the network. In contrast, sequential pattern recognition involves the network memorizing a set of patterns and subsequently retrieving them in a specific order over time. From a dynamical perspective, this corresponds to the presence of a continuous attractor or a cyclic attractor composed of the sequence of patterns stored within the network in a given order. Evidence suggests that the brain is capable of simultaneously performing both associative memory and sequential pattern recognition. Therefore, these types of attractors coexist within the neural network, signifying that some patterns are stored as point attractors, while others are stored as continuous or cyclic attractors. This article investigates the coexistence of cyclic attractors and continuous or point attractors in certain nonlinear neural networks, enabling the simultaneous emergence of various memory mechanisms. By selectively grouping neurons, conditions are established for the existence of cyclic attractors, continuous attractors, and point attractors, respectively. Furthermore, each attractor is explicitly represented, and a competitive dynamic emerges among these coexisting attractors, primarily regulated by adjustments to external inputs.
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Yan S, Zhang F, Luo L, Wang L, Liu Y, Leng J. Shape Memory Polymer Composites: 4D Printing, Smart Structures, and Applications. Research (Wash D C) 2023; 6:0234. [PMID: 37941913 PMCID: PMC10629366 DOI: 10.34133/research.0234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 09/01/2023] [Indexed: 11/10/2023]
Abstract
Shape memory polymers (SMPs) and their composites (SMPCs) are smart materials that can be stably deformed and then return to their original shape under external stimulation, thus having a memory of their shape. Three-dimensional (3D) printing is an advanced technology for fabricating products using a digital software tool. Four-dimensional (4D) printing is a new generation of additive manufacturing technology that combines shape memory materials and 3D printing technology. Currently, 4D-printed SMPs and SMPCs are gaining considerable research attention and are finding use in various fields, including biomedical science. This review introduces SMPs, SMPCs, and 4D printing technologies, highlighting several special 4D-printed structures. It summarizes the recent research progress of 4D-printed SMPs and SMPCs in various fields, with particular emphasis on biomedical applications. Additionally, it presents an overview of the challenges and development prospects of 4D-printed SMPs and SMPCs and provides a preliminary discussion and useful reference for the research and application of 4D-printed SMPs and SMPCs.
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Affiliation(s)
- Shiyu Yan
- Centre for Composite Materials and Structures,
Harbin Institute of Technology (HIT), No.2 Yikuang Street, Harbin 150000, People’s Republic of China
| | - Fenghua Zhang
- Centre for Composite Materials and Structures,
Harbin Institute of Technology (HIT), No.2 Yikuang Street, Harbin 150000, People’s Republic of China
| | - Lan Luo
- Centre for Composite Materials and Structures,
Harbin Institute of Technology (HIT), No.2 Yikuang Street, Harbin 150000, People’s Republic of China
| | - Linlin Wang
- Centre for Composite Materials and Structures,
Harbin Institute of Technology (HIT), No.2 Yikuang Street, Harbin 150000, People’s Republic of China
| | - Yanju Liu
- Department of Astronautic Science and Mechanics,
Harbin Institute of Technology (HIT), No. 92 West Dazhi Street, Harbin 150000, People’s Republic of China
| | - Jinsong Leng
- Centre for Composite Materials and Structures,
Harbin Institute of Technology (HIT), No.2 Yikuang Street, Harbin 150000, People’s Republic of China
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Guan Q, Liu L, Sun J, Wang J, Guo J, Liu Y, Leng J. Multifunctional Soft Stackable Robots by Netting-Rolling-Splicing Pneumatic Artificial Muscles. Soft Robot 2023; 10:1001-1014. [PMID: 37074447 DOI: 10.1089/soro.2022.0104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2023] Open
Abstract
Soft robots equipped with multifunctionalities have been increasingly needed for secure, adaptive, and autonomous functioning in unknown and unpredictable environments. Robotic stacking is a promising solution to increase the functional diversity of soft robots, which are required for safe human-machine interactions and adapting in unstructured environments. However, most existing multifunctional soft robots have a limited number of functions or have not fully shown the superiority of the robotic stacking method. In this study, we present a novel robotic stacking strategy, Netting-Rolling-Splicing (NRS) stacking, based on a dimensional raising method via 2D-to-3D rolling-and-splicing of netted stackable pneumatic artificial muscles to quickly and efficiently fabricate multifunctional soft robots based on the same, simple, and cost-effective elements. To demonstrate it, we developed a TriUnit robot that can crawl 0.46 ± 0.022 body length per second (BL/s) and climb 0.11 BL/s, and can carry a 3 kg payload while climbing. Also, the TriUnit can be used to achieve novel omnidirectional pipe climbing including rotating climbing, and conduct bionic swallowing-and-regurgitating, multi-degree-of-freedom manipulation based on their multimodal combinations. Apart from these, steady rolling, with a speed of 0.19 BL/s, can be achieved by using a pentagon unit. Furthermore, we applied the TriUnit pipe climbing robot in panoramic shooting and cargo transferring to demonstrate the robot's adaptability for different tasks. The NRS stacking-driven soft robot here has demonstrated the best overall performance among existing stackable soft robots, representing a new and effective way for building multifunctional and multimodal soft robots in a cost-effective and efficient way.
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Affiliation(s)
- Qinghua Guan
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin, People's Republic of China
| | - Liwu Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin, People's Republic of China
| | - Jian Sun
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin, People's Republic of China
| | - Jiale Wang
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin, People's Republic of China
| | - Jianglong Guo
- School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, People's Republic of China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin, People's Republic of China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin, People's Republic of China
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Zhao Z, Li X, Wei D, Sun J, Leng J. Design of Superhydrophobic Shape Memory Composites with Kirigami Structures and Uniform Wetting Property. Polymers (Basel) 2023; 15:3738. [PMID: 37765592 PMCID: PMC10536611 DOI: 10.3390/polym15183738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/07/2023] [Accepted: 09/10/2023] [Indexed: 09/29/2023] Open
Abstract
With the continuous increase in human demand to improve aircraft performance, intelligent aircraft technologies have become a popular research field in recent years. Among them, the deformable skin structure has become one of the key technologies to achieve excellent and reliable performance. However, during the service, deformable skin structures may encounter problems such as surface impact and adhesion of droplets in rainy weather or surface icing in low-temperature environments, which can seriously affect the flight safety of the aircraft. One way to overcome these issues is to use superhydrophobic shape memory materials in the structure. In this regard, first, shape memory composites were prepared with shape memory epoxy resin as the matrix and carbon fiber orthogonal woven fabric as the reinforcement material. Superhydrophobic shape memory composites (SSMCs) were then obtained by casting the kirigami composite with superhydrophobic carbon nanotube-polydimethylsiloxane (CNT@PDMS) mixture, and the surface was processed by laser micromachining. Shape memory performance and surface wetting performance were determined by material testing methods. The results showed that the shape memory recovery rate can reach 85.11%, the surface is superhydrophobic, the average water contact angle is 156.9 ± 4.4°, and the average rolling angle is 3 ± 0.5°. The three-point bending test of the specimens with different kirigami cell configurations showed that the shape memory composite based on the rectangular structure has the best deformability with an aspect ratio of 0.4. From the droplet impact test, it was found that the impact speed of water droplets and the curvature of the surface can greatly affect the dynamic performance of water. This work is expected to be of significant research value and importance for developing functional deformable skin materials.
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Affiliation(s)
- Zhe Zhao
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China; (Z.Z.); (J.L.)
| | - Xinlin Li
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China; (Z.Z.); (J.L.)
| | - Dongsong Wei
- Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, China;
| | - Jian Sun
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China; (Z.Z.); (J.L.)
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China; (Z.Z.); (J.L.)
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Wang L, Zhang F, Du S, Leng J. 4D Printing of Triple-Shape Memory Cyanate Composites Based on Interpenetrating Polymer Network Structures. ACS Appl Mater Interfaces 2023; 15:21496-21506. [PMID: 37084334 DOI: 10.1021/acsami.3c01750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The triple-shape memory polymer (TSMP) can be programmed into two temporary shapes (S1 and S2) and shows an ordinal recovery from S2 to S1 and eventually to the permanent shape upon heating, which realizes more complex stimulus-response motions. We introduced a novel strategy for forming triple-shape memory cyanate ester (TSMCE) resins with high strength and fracture toughness via three-step curing, including four-dimensional (4D) printing, UV post-curing, and thermal curing. The obtained TSMCE resins presented two separated glass transition temperature (Tg) regions due to the formation of an interpenetrating polymer network (IPN), which successfully endowed the polymers with the triple-shape memory effect. The two Tg increased with the increasing cyanate ester (CE) prepolymer content; their ranges were 82.7-102.1 °C and 164.4-229.0 °C, respectively. The fracture strain of the IPN CE resin was up to 10.9%. Moreover, the cooperation of short carbon fibers (CFs) and glass fibers (GFs) with the polymer-accelerated phase separation resulted in two well-separated Tg peaks exhibiting better excellent triple-shape memory behaviors and fracture toughness. The strategy for combining the IPN structure and 4D printing provides insight into the preparation of shape memory polymers integrating high strength and toughness, multiple-shape memory effect, and multifunctionality.
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Affiliation(s)
- Linlin Wang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150080, People's Republic of China
| | - Fenghua Zhang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150080, People's Republic of China
| | - Shanyi Du
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150080, People's Republic of China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150080, People's Republic of China
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Li C, Zhang F, Zhao W, Wang L, Liu Y, Leng J. Preparation and Properties of Shape Memory PEG/IEM Resin and Its Composite Designed for Ureter Stent. Adv Healthc Mater 2023:e2300400. [PMID: 37071549 DOI: 10.1002/adhm.202300400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 04/12/2023] [Indexed: 04/19/2023]
Abstract
In this paper, isocyanoethyl methacrylate (IEM) is used to functionalize the two ends of poly(ethylene glycol)(PEG) diol with acrylic acid groups through an urethanisation reaction. The synthesized PEG/IEM resin is then photo-cured with a 405 nm ultraviolet lamp. Ttrans of the PEG/IEM resin can be regulated by the different molecular weights of PEG and the use of plasticizer Triacetin to reach 44°C, which is closer to the human body temperature. Cytotoxicity assay and DMA shape memory cycling testing show that the PEG/IEM resin has excellent biocompatibility and shape memory properties. The flower structure is prepared and its shape recovery process is demonstrated. The performance of 10wt% nano Fe3 O4 /PEG4000/IEM resin and its composite spring stent structure satisfy the requirement of the stent properties in vivo, and can quickly recover to the original shape under magnetically driven. This work provides a material option for developing new biological application devices such as ureter stents. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Ce Li
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin, 150080, P. R. China
| | - Fenghua Zhang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin, 150080, P. R. China
| | - Wei Zhao
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), No. 92 West Dazhi Street, Harbin, 150001, P. R. China
| | - Linlin Wang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin, 150080, P. R. China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), No. 92 West Dazhi Street, Harbin, 150001, P. R. China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin, 150080, People's Republic of China
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Ping Z, Xie F, Gong X, Liu L, Leng J, Liu Y. Effects of Accelerated Aging on Thermal, Mechanical and Shape Memory Properties of Cyanate-Based Shape Memory Polymer: III Vacuum Thermal Cycling. Polymers (Basel) 2023; 15:polym15081893. [PMID: 37112039 PMCID: PMC10141106 DOI: 10.3390/polym15081893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/08/2023] [Accepted: 04/10/2023] [Indexed: 04/29/2023] Open
Abstract
Shape memory polymers (SMPs) with intelligent deformability have shown great potential in the field of aerospace, and the research on their adaptability to space environments has far-reaching significance. Chemically cross-linked cyanate-based SMPs (SMCR) with excellent resistance to vacuum thermal cycling were obtained by adding polyethylene glycol (PEG) with linear polymer chains to the cyanate cross-linked network. The low reactivity of PEG overcame the shortcomings of high brittleness and poor deformability while endowing cyanate resin with excellent shape memory properties. The SMCR with a glass transition temperature of 205.8 °C exhibited good stability after vacuum thermal cycling. The SMCR maintained a stable morphology and chemical composition after repeated high-low temperature cycle treatments. The SMCR matrix was purified by vacuum thermal cycling, which resulted in an increase in its initial thermal decomposition temperature by 10-17 °C. The continuous vacuum high and low temperature relaxation of the vacuum thermal cycling increased the cross-linking degree of the SMCR, which improved the mechanical properties and thermodynamic properties of SMCR: the tensile strength of SMCR was increased by about 14.5%, the average elastic modulus was greater than 1.83 GPa, and the glass transition temperature increased by 5-10 °C. Furthermore, the shape memory properties of SMCR after vacuum thermal cycling treatment were well maintained due to the stable triazine ring formed by the cross-linking of cyanate resin. This revealed that our developed SMCR had good resistance to vacuum thermal cycling and thus may be a good candidate for aerospace engineering.
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Affiliation(s)
- Zhongxin Ping
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China
| | - Fang Xie
- Department of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
| | - Xiaobo Gong
- School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
| | - Liwu Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin 150001, China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin 150001, China
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Li Y, Zhang Y, Zhou W, Li R, Yu J, Gong L, Leng J, Lu F, Hou J, Chen H, Gao Q. Depression mediated the relationships between precentral-subcortical causal links and motor recovery in spinal cord injury patients. Cereb Cortex 2023:7034218. [PMID: 36775985 DOI: 10.1093/cercor/bhad035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/13/2023] [Accepted: 01/14/2023] [Indexed: 02/14/2023] Open
Abstract
Depression after brain damage may impede the motivation and consequently influence the motor recovery after spinal cord injury (SCI); however, the neural mechanism underlying the psychological effects remains unclear. This study aimed to examine the casual connectivity changes of the emotion-motivation-motor circuit and the potential mediating effects of depression on motor recovery after SCI. Using the resting-state functional magnetic resonance imaging data of 35 SCI patients (24 good recoverers, GR and 11 poor recoverers, PR) and 32 healthy controls (HC), the results from the conditional Granger causality (GC) analysis demonstrated that the GR group exhibited sparser emotion-motivation-motor GC network compared with the HC and PR groups, though the in-/out-degrees of the emotion subnetwork and the motor subnetwork were relatively balanced in the HC and GR group. The PR group showed significantly inhibitory causal links from amygdala to supplementary motor area and from precentral gyrus to nucleus accumbens compared with GR group. Further mediation analysis revealed the indirect effect of the 2 causal connections on motor function recovery via depression severity. Our findings provide further evidence of abnormal causal connectivity in emotion-motivation-motor circuit in SCI patients and highlight the importance of emotion intervention for motor function recovery after SCI.
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Affiliation(s)
- Yan Li
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China
| | - Yang Zhang
- The Southwest Hospital, Third Military Medical University, Chongqing, Gaotanyan Road, Shapingba District, 400038, P.R. China
| | - Weiqi Zhou
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China
| | - Rong Li
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China
| | - Jiali Yu
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China
| | - Lisha Gong
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China
| | - Jinsong Leng
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China
| | - Fengmei Lu
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China
| | - Jingming Hou
- The Southwest Hospital, Third Military Medical University, Chongqing, Gaotanyan Road, Shapingba District, 400038, P.R. China
| | - Huafu Chen
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China.,The Center of Psychosomatic Medicine, Sichuan Provincial Center for Mental Health, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, Yihuan Road, Qingyang District, 610072, P.R. China
| | - Qing Gao
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, No. 2006, Xiyuan Ave, West Hi-Tech Zone, 611731, P.R. China
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12
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Lin C, Huang Z, Wang Q, Zou Z, Wang W, Liu L, Liu Y, Leng J. 4D Printing of Overall Radiopaque Customized Bionic Occlusion Devices. Adv Healthc Mater 2023; 12:e2201999. [PMID: 36337009 DOI: 10.1002/adhm.202201999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/28/2022] [Indexed: 11/09/2022]
Abstract
Percutaneous closure of ventricular septal defect (VSD) can effectively occlude abnormal blood flow between ventricles. However, commonly used Nitinol occlusion devices have non-negligible limitations, such as nondegradability leading to life-threatening embolization; limited device size predisposing to displacement and wear; only a few radiopaque markers resulting in inaccurate positioning. Nevertheless, the exploration of customized, biodegradable, and overall radiopaque occluders is still vacant. Here, overall radiopaque, biodegradable, and dynamic reconfigurable 4D printed VSD occluders are developed. Based on wavy bionic structures, various VSD occluders are designed and manufactured to adapt to the position diversity of VSD. The customized configuration, biocompatibility, and biodegradability of the developed 4D printed bionic occluders can eliminate the series of complications caused by traditional occluders. The overall radiopacity of 4D printed VSD occluders is validated ex vivo and in vivo, whereby accurate positioning can be assured. Notably, the preparation strategies for 4D printed occluders are scalable, eliminating the barriers to mass production, and marking a meaningful step in bridging the gap between modeling and clinical application of 4D printed occlusion devices. This work opens attractive perspectives for the rapid manufacturing of customized intelligent medical devices for which overall radiopacity, dynamic reconfigurability, biocompatibility, and biodegradability are sought.
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Affiliation(s)
- Cheng Lin
- Centre for Composite Materials and Structures, Harbin Institute of Technology, No. 2 Yikuang Street, Harbin, 150001, P. R. China
| | - Zhipeng Huang
- Tangdu Hospital of the Air Force Military Medical University, No. 1, Xinsi Road, Xi'an, 710038, P. R. China
| | - Qinglong Wang
- Tangdu Hospital of the Air Force Military Medical University, No. 1, Xinsi Road, Xi'an, 710038, P. R. China
| | - Zhichen Zou
- The First Affiliated Hospital of Harbin Medical University, No. 23 Youzheng Street, Nangang District, Harbin, 150001, P. R. China
| | - Wenbo Wang
- The First Affiliated Hospital of Harbin Medical University, No. 23 Youzheng Street, Nangang District, Harbin, 150001, P. R. China
| | - Liwu Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, No. 92 West Dazhi Street, Harbin, 150001, P. R. China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, No. 92 West Dazhi Street, Harbin, 150001, P. R. China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology, No. 2 Yikuang Street, Harbin, 150001, P. R. China
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13
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Liu W, He Y, Leng J. Humidity-Responsive Shape Memory Polyurea with a High Energy Output Based on Reversible Cross-Linked Networks. ACS Appl Mater Interfaces 2023; 15:2163-2171. [PMID: 36571177 DOI: 10.1021/acsami.2c18489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
High-performance shape memory polymers with multifunctions are essential in sensors, wearable flexible electronics, artificial muscle actuators, and reversible morphing structures. In this work, a transparent and humidity-responsive shape memory polyurea featuring a high tensile strength (51 MPa), a high recovery stress (12 MPa) with an high energy output (0.98 J/g), and tolerance to extreme environments (retains great malleability at -196 °C) is prepared through constructing a bioinspired hard-soft nanophase structure and through hierarchical hydrogen bonding in the molecular network. The hard segment of a strong hydrogen bonding region is in charge of humidity-responsive behavior, and the soft segment of a weak bonding region provides the flexibility of the molecular chain. Furthermore, the periodicity of the phase-separated domains is 12 nm as characterized by small-angle X-ray scattering. The hydrogen bonding cross-linked network can be opened under the action of stress and re-bonded by heating, just like a zipper structure of reversible linking property. This unique molecular structure contributes to the humidity-responsive behavior of polyurea rolling up 160° in 20 s on the palm, as well as a high energy output lifting a 100 g weight exceeding 1631 times its own mass to 60 mm. The molecular structure of the hard-soft nanophase and the hierarchical hydrogen bonding offer an effective approach toward achieving a high-performance shape memory polymer with humidity-sensitive functions.
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Affiliation(s)
- Wen Liu
- Center for Composite Materials and Structures, Harbin Institute of Technology, 150080Harbin, P. R. China
| | - Yang He
- Center for Composite Materials and Structures, Harbin Institute of Technology, 150080Harbin, P. R. China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology, 150080Harbin, P. R. China
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14
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Zhao W, Yue C, Liu L, Liu Y, Leng J. Research Progress of Shape Memory Polymer and 4D Printing in Biomedical Application. Adv Healthc Mater 2022:e2201975. [PMID: 36520058 DOI: 10.1002/adhm.202201975] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 11/06/2022] [Indexed: 12/23/2022]
Abstract
As a kind of smart material, shape memory polymer (SMP) shows great application potential in the biomedical field. Compared with traditional metal-based medical devices, SMP-based devices have the following characteristics: 1) The adaptive ability allows the biomedical device to better match the surrounding tissue after being implanted into the body by minimally invasive implantation; 2) it has better biocompatibility and adjustable biodegradability; 3) mechanical properties can be regulated in a large range to better match with the surrounding tissue. 4D printing technology is a comprehensive technology based on smart materials and 3D printing, which has great application value in the biomedical field. 4D printing technology breaks through the technical bottleneck of personalized customization and provides a new opportunity for the further development of the biomedical field. This paper summarizes the application of SMP and 4D printing technology in the field of bone tissue scaffolds, tracheal scaffolds, and drug release, etc. Moreover, this paper analyzes the existing problems and prospects, hoping to provide a preliminary discussion and useful reference for the application of SMP in biomedical engineering.
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Affiliation(s)
- Wei Zhao
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin, 150001, P. R. China
| | - Chengbin Yue
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin, 150001, P. R. China
| | - Liwu Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin, 150001, P. R. China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin, 150001, P. R. China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), P.O. Box 3011, No. 2 Yikuang Street, Harbin, 150080, P. R. China
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15
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Abstract
Soft adhesion is capable of attaching and bonding to rough surfaces and gripping nonplanar materials. It is preferable for material handling applications where safe interactions with external environments and enhanced adaptability to changing conditions are required. Soft electroadhesion (EA) is an emerging controllable adhesion technology that is especially suited to soft adhesion applications, but is prone to contact peeling that causes unwanted de-adhesion and cannot lift heavy objects unless the lifting force is applied parallel to the surface. Variable stiffness electroadhesion (VSEA) can be used to overcome these issues. Here a VSEA solution is developed by integrating electrostatic layer jamming and soft EA into a monolithic electrically controllable structure. The VSEA pad can achieve rapid response (within 1 s) and significant stiffness change (2200%), resist over four times the peeling force under a weight of 70 g, and generate 24.2%, 34.8%, and 49.3% greater adhesive forces on flat, convex, and concave surfaces, respectively. The promising gripping performance of the VSEA gripper was demonstrated by lifting and moving curved and flat objects. The VSEA concept and solution shown in this work may pave the way for the ready integration of EA into soft robotic systems and promote the broad application of EA technologies.
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Affiliation(s)
- Rui Chen
- State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China
| | - Zhuo Zhang
- State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China
| | - Jianglong Guo
- School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, China
| | - Fuyou Liu
- State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, China
| | - Jonathan Rossiter
- SoftLab, Bristol Robotics Laboratory, University of Bristol, Bristol, United Kingdom
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16
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Deng Y, Yang B, Zhang F, Liu Y, Sun J, Zhang S, Zhao Y, Yuan H, Leng J. 4D printed orbital stent for the treatment of enophthalmic invagination. Biomaterials 2022; 291:121886. [DOI: 10.1016/j.biomaterials.2022.121886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/31/2022] [Accepted: 10/26/2022] [Indexed: 11/09/2022]
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17
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Li Q, Le Duigou A, Guo J, Thakur VK, Rossiter J, Liu L, Leng J, Scarpa F. Biobased and Programmable Electroadhesive Metasurfaces. ACS Appl Mater Interfaces 2022; 14:47198-47208. [PMID: 36201852 PMCID: PMC9585522 DOI: 10.1021/acsami.2c10392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 09/09/2022] [Indexed: 06/16/2023]
Abstract
Electroadhesion has shown the potential to deliver versatile handling devices because of its simplicity of actuation and rapid response. Current electroadhesion systems have, however, significant difficulties in adapting to external objects with complex shapes. Here, a novel concept of metasurface is proposed by combining the use of natural fibers (flax) and shape memory epoxy polymers in a hygromorphic and thermally actuated composite (HyTemC). The biobased material composite can be used to manipulate adhesive surfaces with high precision and controlled environmental actuation. The HyTemC concept is preprogrammed to store controllable moisture and autonomous desorption when exposed to the operational environment, and can reach predesigned bending curvatures up to 31.9 m-1 for concave and 29.6 m-1 for convex shapes. The actuated adhesive surface shapes are generated via the architected metasurface structure, incorporating an electroadhesive component integrated with the programmable biobased materials. This biobased metasurface stimulated by the external environment provides a large taxonomy of shapes─from flat, circular, single/double concave, and wavy, to piecewise, polynomial, trigonometric, and airfoil configurations. The objects handled by the biobased metasurface can be fragile because of the high conformal matching between contacting surfaces and the absence of compressive adhesion. These natural fiber-based and environmentally friendly electroadhesive metasurfaces can significantly improve the design of programmable object handling technologies, and also provide a sustainable route to lower the carbon and emission footprint of smart structures and robotics.
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Affiliation(s)
- Qinyu Li
- Bristol
Composites Institute, University of Bristol, BS8 1TRBristol, U.K.
| | - Antoine Le Duigou
- Polymer
and Composites, Université Bretagne
Sud, IRDL UMR CNRS 6027, F-56100Lorient, France
| | - Jianglong Guo
- School
of Science, Harbin Institute of Technology
(Shenzhen), Shenzhen518055, P. R. China
| | - Vijay Kumar Thakur
- Biorefining
and Advanced Materials Research Center, Scotland’s Rural College (SRUC), Kings Buildings, West Mains Road, EH9 3JGEdinburgh, U.K.
- School
of Engineering, University of Petroleum
and Energy Studies (UPES), Dehradun248007, Uttarakhand, India
| | - Jonathan Rossiter
- SoftLab,
Bristol Robotics Laboratory, University
of Bristol, Ada Lovelace
Building, University Walk, BS8 1TWBristol, U.K.
| | - Liwu Liu
- Department
of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin150001, P. R. China
| | - Jinsong Leng
- National
Key Laboratory of Science and Technology on Advanced Composites in
Special Environments, Harbin Institute of
Technology (HIT), No.
2 Yikuang Street, P.O. Box 3011, Harbin150080, P. R. China
| | - Fabrizio Scarpa
- Bristol
Composites Institute, University of Bristol, BS8 1TRBristol, U.K.
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18
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Deng Y, Zhang F, Jiang M, Liu Y, Yuan H, Leng J. Programmable 4D Printing of Photoactive Shape Memory Composite Structures. ACS Appl Mater Interfaces 2022; 14:42568-42577. [PMID: 36097702 DOI: 10.1021/acsami.2c13982] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
4D printing is an advanced manufacturing technology combining additive manufacturing with smart materials. Based on light-active shape memory composites, smart medical structures with remote control capability, therapeutic function, and biocompatibility are hopefully fabricated by 4D printing. Here, a multifunctional composite with good mechanical properties, biocompatibility, and light-active shape memory performance is prepared by incorporating gold nanoparticles into a shape memory polyurethane matrix. The composites demonstrate a rapid and stable light-thermal effect, which can achieve localized and controlled breast tumor ablation, providing an approach to hyperthermia treatment for cancer cells. By directly bioprinting the composite melt, a series of 4D-printed structures are manufactured accurately in a convenient, clean, and safe way, which show a fast autonomous light-driven shape recovery process. The examples of a 4D-printed soft tissue scaffold and intraluminal scaffold can expand from a conveniently insertional shape to an expanded shape under light exposure. The proposed strategies provide great inspiration for customized multifunctional light-thermal therapeutic structures for minimally invasive treatment.
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Affiliation(s)
- Yongdie Deng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150000, People's Republic of China
| | - Fenghua Zhang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150000, People's Republic of China
| | - Menglu Jiang
- Department of Ophthalmology, The Second Affiliated Hospital of Harbin Medical University, No. 246 Xuefu Road, Harbin 150000, People's Republic of China
| | - Yanju Liu
- Department of Astronautic Science and Mechanics, Harbin Institute of Technology (HIT), No. 92 West Dazhi Street, Harbin 150000, People's Republic of China
| | - Huiping Yuan
- Department of Ophthalmology, The Second Affiliated Hospital of Harbin Medical University, No. 246 Xuefu Road, Harbin 150000, People's Republic of China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150000, People's Republic of China
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19
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Gao Q, Luo N, Sun M, Zhou W, Li Y, Liang M, Yang C, Zhang M, Li R, Gong L, Yu J, Leng J, Chen H. Neural efficiency and proficiency adaptation of effective connectivity corresponding to early and advanced skill levels in athletes of racket sports. Hum Brain Mapp 2022; 44:388-402. [PMID: 36053219 PMCID: PMC9842890 DOI: 10.1002/hbm.26057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 07/14/2022] [Accepted: 08/14/2022] [Indexed: 01/25/2023] Open
Abstract
This study explored how the neural efficiency and proficiency worked in athletes with different skill levels from the perspective of effective connectivity brain network in resting state. The deconvolved conditioned Granger causality (GC) analysis was applied to functional magnetic resonance imaging (fMRI) data of 35 elite athletes (EAs) and 42 student-athletes (SAs) of racket sports as well as 39 normal controls (NCs), to obtain the voxel-wised hemodynamic response function (HRF) parameters representing the functional segregation and effective connectivity representing the functional integration. The results showed decreased time-to-peak of HRF in the visual attention brain regions in the two athlete groups compared with NC and decreased response height in the advanced motor control brain regions in EA comparing to the nonelite groups, suggesting the neural efficiency represented by the regional HRF was different in early and advanced skill levels. GC analysis demonstrated that the GC values within the middle occipital gyrus had a linear trend from negative to positive, suggesting a stepwise "neural proficiency" of the effective connectivity from NC to SA then to EA. The GC values of the inter-lobe circuits in EA had the trend to regress to NC levels, in agreement with the neural efficiency of these circuits in EA. Further feature selection approach suggested the important role of the cerebral-brainstem GC circuit for discriminating EA. Our findings gave new insight into the complementary neural mechanisms in brain functional segregation and integration, which was associated with early and advanced skill levels in athletes of racket sports.
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Affiliation(s)
- Qing Gao
- Department of RadiologyFirst Affiliated Hospital to Army Medical UniversityChongqingPeople's Republic of China,School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China,The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High‐Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Life Science and TechnologyUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Ning Luo
- School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Mengli Sun
- School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Weiqi Zhou
- School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Yan Li
- School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Minfeng Liang
- School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Chengbo Yang
- The Third Department of Physical Education and TrainingChengdu Sport UniversityChengduPeople's Republic of China
| | - Mu Zhang
- Information Technology CenterChengdu Sport UniversityChengduPeople's Republic of China
| | - Rong Li
- The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High‐Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Life Science and TechnologyUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Lisha Gong
- School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Jiali Yu
- School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Jinsong Leng
- School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
| | - Huafu Chen
- Department of RadiologyFirst Affiliated Hospital to Army Medical UniversityChongqingPeople's Republic of China,The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, High‐Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, School of Life Science and TechnologyUniversity of Electronic Science and Technology of ChinaChengduPeople's Republic of China
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20
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Li X, Leng J, Yu L, Bai H, Li X, Wisniewski M, Liu J, Sui Y. Efficacy of the biocontrol agent Trichoderma hamatum against Lasiodiplodia theobromae on macadamia. Front Microbiol 2022; 13:994422. [PMID: 36118222 PMCID: PMC9470996 DOI: 10.3389/fmicb.2022.994422] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 08/15/2022] [Indexed: 11/27/2022] Open
Abstract
Macadamia (Macadamia integrifolia) trees are an important source of revenue in rainforest ecosystems. Their nuts are rich in vitamins, minerals, fiber, antioxidants, and monounsaturated oils. The fungus Lasiodiplodia theobromae, however, is a major disease problem, causing kernel rot and other disease symptoms. In the present study, a dual confrontation assay was used to evaluate the inhibitory effect of an endophytic strain of Trichoderma hamatum C9 from macadamia root against L. theobromae. Volatiles and cell-free culture filtrate of T. hamatum were also used to assess their antifungal activity against L. theobromae. Results suggested that T. hamatum exhibited a significant inhibitory effect against L. theobromae in vitro. Further results of a biocontrol assay indicated that a spray treatment of T. hamatum conidial suspension significantly decreased the size of lesions caused by artificially inoculated L. theobromae on macadamia leaves, as well as the disease index in young trees inoculated with L. theobromae, relative to sterile water controls. Collectively, our findings indicate that T. hamatum C9 represents a potential biocontrol agent that can be used to manage L. theobromae on macadamia.
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Affiliation(s)
- Xiaojiao Li
- School of Biotechnology and Bioengineering, West Yunnan University, Lincang, China
| | - Jinsong Leng
- Chongqing Key Laboratory of Economic Plant Biotechnology, College of Landscape Architecture and Life Science/Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, China
| | - Longfeng Yu
- School of Biotechnology and Bioengineering, West Yunnan University, Lincang, China
- *Correspondence: Longfeng Yu,
| | | | - Xiaojun Li
- School of Biotechnology and Bioengineering, West Yunnan University, Lincang, China
| | - Michael Wisniewski
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Jia Liu
- Chongqing Key Laboratory of Economic Plant Biotechnology, College of Landscape Architecture and Life Science/Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, China
- Jia Liu,
| | - Yuan Sui
- Chongqing Key Laboratory of Economic Plant Biotechnology, College of Landscape Architecture and Life Science/Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, China
- Yuan Sui,
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21
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Li Q, Sun R, Duigou AL, Guo J, Rossiter J, Li L, Leng J, Scarpa F. Large datasets of water vapor sorption, mass diffusion immersed in water, hygroscopic expansion and mechanical properties of flax fibre/shape memory epoxy hygromorph composites. Data Brief 2022; 43:108367. [PMID: 35770025 PMCID: PMC9234088 DOI: 10.1016/j.dib.2022.108367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 06/03/2022] [Indexed: 12/01/2022] Open
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22
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Lin C, Huang Z, Wang Q, Wang W, Wang W, Wang Z, Liu L, Liu Y, Leng J. 3D Printed Bioinspired Stents with Photothermal Effects for Malignant Colorectal Obstruction. Research (Wash D C) 2022; 2022:9825656. [PMID: 35909937 PMCID: PMC9285633 DOI: 10.34133/2022/9825656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 06/09/2022] [Indexed: 11/06/2022] Open
Abstract
Stent placement is an effective palliation therapy for malignant colorectal obstruction. However, recurrent obstruction is a common severe complication caused by tumor ingrowth into the stent lumen. Conventional covered stents play a part in preventing the tumor from growing inward but at the expense of significantly increasing the risk of stent migration. Therefore, there is an urgent demand to develop stents with sustained antitumor and antimigration abilities. Herein, we propose a facile method for fabricating multifunctional bioinspired colorectal stents using 3D printing technology. Inspired by high-adhesion biological structures (gecko feet, tree frog toe pads, and octopus suckers) in nature, different types of bioinspired colorectal stents are designed to reduce migration. After functionalization with graphene oxide (GO), bioinspired colorectal stents show excellent and controllable photothermal performance, which is validated by effective ablation of colon cancer cells in vitro and tumors in vivo. Besides, the bioinspired colorectal stents demonstrate the feasibility of transanal placement and opening of the obstructed colon. More importantly, the facile manufacturing process of multifunctional bioinspired colorectal stents is appealing for mass production. Hence, the developed multifunctional bioinspired colorectal stents exhibit a highly promising potential in clinical applications.
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Affiliation(s)
- Cheng Lin
- Centre for Composite Materials and Structures, Harbin Institute of Technology, No. 2 Yikuang Street, Harbin 150001, China
| | - Zhipeng Huang
- Tangdu Hospital of the Air Force Military Medical University, No. 1, Xinsi Road, Xi'an 710038, China
| | - Qinglong Wang
- The First Affiliated Hospital of Harbin Medical University, No. 23 Youzheng Street, Nangang District, Harbin 150001, China
| | - Wantao Wang
- The First Affiliated Hospital of Harbin Medical University, No. 23 Youzheng Street, Nangang District, Harbin 150001, China
| | - Wenbo Wang
- The First Affiliated Hospital of Harbin Medical University, No. 23 Youzheng Street, Nangang District, Harbin 150001, China
| | - Zhen Wang
- The Second Affiliated Hospital of Harbin Medical University, No. 246 Xuefu Street, Nangang District, Harbin 150001, China
| | - Liwu Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, No. 92 West Dazhi Street, Harbin 150001, China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology, No. 92 West Dazhi Street, Harbin 150001, China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology, No. 2 Yikuang Street, Harbin 150001, China
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23
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Leng J, Dai Y, Qiu D, Zou Y, Wu X. Utilization of the antagonistic yeast, Wickerhamomyces anomalus, combined with UV-C to manage postharvest rot of potato tubers caused by Alternaria tenuissima. Int J Food Microbiol 2022; 377:109782. [DOI: 10.1016/j.ijfoodmicro.2022.109782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 05/21/2022] [Accepted: 06/04/2022] [Indexed: 10/18/2022]
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Leng J, Yu L, Dai Y, Leng Y, Wang C, Chen Z, Wisniewski M, Wu X, Liu J, Sui Y. Recent advances in research on biocontrol of postharvest fungal decay in apples. Crit Rev Food Sci Nutr 2022; 63:10607-10620. [PMID: 35608023 DOI: 10.1080/10408398.2022.2080638] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Apple is the largest fruit crop produced in temperate regions and is a popular fruit worldwide. It is, however, susceptible to a variety of postharvest fungal pathogens, including Penicillium expansum, Botrytis cinerea, Botryosphaeria dothidea, Monilia spp., and Alternaria spp. Decays resulting from fungal infections severely reduce apple quality and marketable yield. Biological control utilizing bacterial and fungal antagonists is an eco-friendly and effective method of managing postharvest decay in horticultural crops. In the current review, research on the pathogenesis of major decay fungi and isolation of antagonists used to manage postharvest decay in apple is presented. The mode of action of postharvest biocontrol agents (BCAs), including recent molecular and genomic studies, is also discussed. Recent research on the apple microbiome and its relationship to disease management is highlighted, and the use of additives and physical treatments to enhance biocontrol efficacy of BCAs is reviewed. Biological control is a critical component of an integrated management system for the sustainable approaches to apple production. Additional research will be required to explore the feasibility of developing beneficial microbial consortia and novel antimicrobial compounds derived from BCAs for postharvest disease management, as well as genetic approaches, such as the use of CRISPR/Cas9 technology.
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Affiliation(s)
- Jinsong Leng
- Chongqing University of Arts and Sciences, Yongchuan, Chongqing, China
| | - Longfeng Yu
- School of Biotechnology and Bioengineering, West Yunnan University, Lincang, Yunan, China
| | - Yuan Dai
- Chongqing University of Arts and Sciences, Yongchuan, Chongqing, China
| | - Yan Leng
- School of Biotechnology and Bioengineering, West Yunnan University, Lincang, Yunan, China
| | - Chaowen Wang
- School of Biotechnology and Bioengineering, West Yunnan University, Lincang, Yunan, China
| | - Zhuo Chen
- Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, Guizhou, China
| | - Michael Wisniewski
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
| | - Xuehong Wu
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, Beijing, China
| | - Jia Liu
- Chongqing University of Arts and Sciences, Yongchuan, Chongqing, China
| | - Yuan Sui
- Chongqing University of Arts and Sciences, Yongchuan, Chongqing, China
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25
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Yang S, He Y, Leng J. Enhanced Shape Memory Metal-Coordinated Poly(aryl ether ketone)s with Tunable Gradient-Deformation Behaviors as well as Self-Healing and Reprocessing Abilities. ACS Appl Mater Interfaces 2022; 14:20032-20041. [PMID: 35470667 DOI: 10.1021/acsami.2c01728] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Reversible dynamic bonds are able to crack and recombine upon external stimuli, which endow polymers with exceptional self-healing, reprocessing, and reversible deformation ability. In this paper, we integrated the metal coordination bonds into shape memory poly(aryl ether ketone) (PAEK) to fabricate smart materials with multifunctionalities. Through tuning the metal ion content and species, the enhancement of shape memory behaviors was achieved, including the high recovery ratio (over 98%) and fixity ratio (over 98%), which was closely related to the synergic effect of the intrinsic motion ability of PAEK matrix and the cracking-recombination of coordination bonds. Besides, through the combination of the components with different Cu2+ contents, in addition to the components with Fe2+ coordination bonds, we fabricated the gradient shape memory structures with controllable shape memory and recovery behaviors. The manipulation of gradient coordination bonds resulted in different shape recovery speeds and directions. Furthermore, due to the dynamic cracking-recombination of coordination bonds, the metal-coordinated PAEK material exhibited the great self-healing and reprocessing performances, which were significant for largely extending its application range.
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Affiliation(s)
- Shuai Yang
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, P. R. China
| | - Yang He
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, P. R. China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, P. R. China
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Li W, Liu J, Chen L, Wei W, Qian K, Liu Y, Leng J. Application and Development of Shape Memory Micro/Nano Patterns. Small 2022; 18:e2105958. [PMID: 35362270 DOI: 10.1002/smll.202105958] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/12/2021] [Indexed: 06/14/2023]
Abstract
Shape memory polymers (SMPs) are a class of smart materials that change shape when stimulated by environmental stimuli. Different from the shape memory effect at the macro level, the introduction of micro-patterning technology into SMPs strengthens the exploration of the shape memory effect at the micro/nano level. The emergence of shape memory micro/nano patterns provides a new direction for the future development of smart polymers, and their applications in the fields of biomedicine/textile/micro-optics/adhesives show huge potential. In this review, the authors introduce the types of shape memory micro/nano patterns, summarize the preparation methods, then explore the imminent and potential applications in various fields. In the end, their shortcomings and future development direction are also proposed.
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Affiliation(s)
- Wenbing Li
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, 214122, P. R. China
| | - Junhao Liu
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, 214122, P. R. China
| | - Lei Chen
- Department of Biomedical Engineering, College of Engineering, Southern University of Science and Technology, Shenzhen, 518055, P. R. China
| | - Wanting Wei
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, 214122, P. R. China
| | - Kun Qian
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi, 214122, P. R. China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin, 150001, P. R. China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin, 150080, P. R. China
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Herath M, Emmanuel C, Jeewantha J, Epaarachchi J, Leng J. Distributed sensing based real‐time process monitoring of shape memory polymer components. J Appl Polym Sci 2022. [DOI: 10.1002/app.52247] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Madhubhashitha Herath
- Centre for Future Materials University of Southern Queensland Toowoomba Queensland Australia
- Department of Engineering Technology, Faculty of Technological Studies Uva Wellassa University Badulla Sri Lanka
| | - Chris Emmanuel
- Centre for Future Materials University of Southern Queensland Toowoomba Queensland Australia
- School of Mechanical and Electrical Engineering, Faculty of Health Engineering and Sciences University of Southern Queensland Toowoomba Queensland Australia
| | - Janitha Jeewantha
- Centre for Future Materials University of Southern Queensland Toowoomba Queensland Australia
- School of Mechanical and Electrical Engineering, Faculty of Health Engineering and Sciences University of Southern Queensland Toowoomba Queensland Australia
| | - Jayantha Epaarachchi
- Centre for Future Materials University of Southern Queensland Toowoomba Queensland Australia
- School of Mechanical and Electrical Engineering, Faculty of Health Engineering and Sciences University of Southern Queensland Toowoomba Queensland Australia
| | - Jinsong Leng
- Center for Composite Materials and Structures Harbin Institute of Technology Harbin China
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Huang Y, Yu J, Leng J, Liu B, Yi Z. Continuous Recurrent Neural Networks Based on Function Satlins. Neural Process Lett 2022. [DOI: 10.1007/s11063-021-10682-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Luo L, Zhang F, Leng J. Shape Memory Epoxy Resin and Its Composites: From Materials to Applications. Research (Wash D C) 2022; 2022:9767830. [PMID: 35360647 PMCID: PMC8949802 DOI: 10.34133/2022/9767830] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Accepted: 02/06/2022] [Indexed: 01/14/2023]
Abstract
Shape memory polymers (SMPs) have historically attracted attention for their unique stimulation-responsive and variable stiffness and have made notable progress in aerospace, civil industry, and other fields. In particular, epoxy resin (EP) has great potential due to its excellent mechanical properties, fatigue resistance, and radiation resistance. Herein, we focus on the molecular design and network construction of shape memory epoxy resins (SMEPs) to provide opportunities for performance and functional regulation. Multifunctional and high-performance SMEPs are introduced in detail, including multiple SMEPs, two-way SMEPs, outstanding toughness, and temperature resistance. Finally, emerging applications of SMEPs and their composites in aerospace, four-dimensional printing, and self-healing are demonstrated. Based on this, we point out the challenges ahead and how SMEPs can integrate performance and versatility to meet the needs of technological development.
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Affiliation(s)
- Lan Luo
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China
| | - Fenghua Zhang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China
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Jeewantha LHJ, Epaarachchi JA, Forster E, Islam M, Leng J. Early research of shape memory polymer vascular stents. EXPRESS POLYM LETT 2022. [DOI: 10.3144/expresspolymlett.2022.66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Lin C, Liu L, Liu Y, Leng J. Recent developments in next-generation occlusion devices. Acta Biomater 2021; 128:100-119. [PMID: 33964482 DOI: 10.1016/j.actbio.2021.04.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 04/01/2021] [Accepted: 04/26/2021] [Indexed: 12/20/2022]
Abstract
Transcatheter closure has been widely accepted as a highly effective way to treat abnormal blood flows and/or embolization of thrombus in the heart. It allows the closure of four types of congenital heart defects (CHDs) and stroke-associated left atrial appendage (LAA). The four types of CHDs include atrial septal defect (ASD), patent foramen ovale (PFO), patent ductus arteriosus (PDA), and ventricular septal defect (VSD). Advancements in the materials and configurations of occlusion devices have spurred the transition from open-heart surgery with high complexity and morbidity, or lifelong medication with a high risk of bleeding, to minimally invasive deployment. A variety of occlusion devices have been developed over the past few decades, particularly novel ones represented by biodegradable and 3D-printed occlusion devices, which are considered as next-generation alternatives to conventional Nitinol-based occlusion devices due to biodegradability, customization, and improved biocompatibility. The aim here is to comprehensively review the next-generation occlusion devices in terms of materials, configurations, manufacturing methods, deployment strategies, and (if available) experimental results or clinical data. The current challenges and the direction of future work are also proposed. STATEMENT OF SIGNIFICANCE: Implantation of occlusion devices has become a widely accepted and highly effective treatment for occluding abnormal blood/thrombus flow within the heart. Due to the serious complications such as erosion and displacement of conventional Nitinol-based occluders, next-generation occluders with reduced risk of complications and improved biocompatibility has emerged. Here, we comprehensively review the next-generation occluders developed for atrial septal defect (ASD), patent foramen ovale (PFO), patent ductus arteriosus (PDA), ventricular septal defect (VSD), and left atrial appendage (LAA), with special emphasis on biodegradable occluders. Besides, intelligent materials (e.g., automatically deployable shape memory polymers) and rapid customized manufacturing methods (3D/4D printing) for the fabrication of occluders are also introduced. Lastly, the directions of future work are highlighted.
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Affiliation(s)
- Cheng Lin
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China
| | - Liwu Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China.
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin 150001, People's Republic of China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), P.O. Box 3011, No. 2 Yikuang Street, Harbin 150080, People's Republic of China.
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Abstract
Shape memory polymers (SMPs) are the simplest and most attractive alternatives for soft substrates of typical bilayer wrinkle systems because of shape fixity and recovery capabilities. Herein, we have successfully programmed large compressive strains in chemical cross-linking shape memory polystyrene (PS) microparticles via nanoimprint lithography, which acted as the substrate of a wrinkle system using a gold nanoparticle (Au NP) film as the top layer. When triggered by two different stimuli (direct heating and toluene vapors), the thin Au NP film could transform into various wrinkle structures atop the recovered PS particles. In addition, we also investigated the evolution mechanisms of wrinkling by heating and toluene vapors and tuned the wrinkled surfaces through altering the Au NP thickness and stimulation methods (direct heating and toluene vapors), which utilized the structural adjustability of Au NPs to program the amplitude, wavelength, and morphology of the wrinkles. The concept presented here provides a cost-effective approach to realize the surface wrinkling and can be extended to other available SMPs.
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Affiliation(s)
- Wenbing Li
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 YiKuang Street, P.O. Box 3011, Harbin 150080, PR China
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, PR China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin 150001, PR China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 YiKuang Street, P.O. Box 3011, Harbin 150080, PR China
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Abstract
Kiwifruit is purchased by consumers worldwide and is increasing in demand. Unfortunately, kiwifruit is susceptible to postharvest decay caused by a variety of fungal pathogens, including Botrytis cinerea, Penicillium expansum, Alternaria alternata, Botryosphaeria dothidea, and Diaporthe spp. Among these pathogens, B. cinerea is the most prevalent and devastating. Infections by these fungal pathogens result in a deterioration in fruit quality and a reduction in marketable yield. Eco-friendly methods to control kiwifruit postharvest decay have been explored as alternatives to the use of synthetic fungicides. In this review, we provide an overview and discuss the virulence and pathogenesis of fungi that are causal agents of kiwifruit decay, especially B. cinerea, including recent molecular and genomic studies. Advances in pre- and postharvest measures for postharvest decay management, including biological control, physical applications, the use of natural compounds and plant hormones, and the use of combined methods, are also reviewed. Eco-friendly control measures are a critical component of an integrated management approach for sustainable production of kiwifruit. The need for further research on the use of microbial consortia for the management of postharvest diseases of kiwifruit is also discussed.
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Affiliation(s)
- Yuan Dai
- Chongqing Key Laboratory of Economic Plant Biotechnology, College of Landscape Architecture and Life Science/Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, Chongqing, China
| | - Zhenshuo Wang
- Department of Plant Pathology, MOA Key Lab of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Beijing, China
| | - Jinsong Leng
- Chongqing Key Laboratory of Economic Plant Biotechnology, College of Landscape Architecture and Life Science/Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, Chongqing, China
| | - Yuan Sui
- Chongqing Key Laboratory of Economic Plant Biotechnology, College of Landscape Architecture and Life Science/Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, Chongqing, China
| | - Mingguo Jiang
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning, China
| | - Michael Wisniewski
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
| | - Jia Liu
- Chongqing Key Laboratory of Economic Plant Biotechnology, College of Landscape Architecture and Life Science/Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, Chongqing, China
| | - Qi Wang
- Department of Plant Pathology, MOA Key Lab of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Beijing, China
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Wang L, Zhang F, Liu Y, Du S, Leng J. Photosensitive Composite Inks for Digital Light Processing Four-Dimensional Printing of Shape Memory Capture Devices. ACS Appl Mater Interfaces 2021; 13:18110-18119. [PMID: 33845571 DOI: 10.1021/acsami.1c02624] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
High-performance shape memory thermosetting polymers and their composites for four-dimensional (4D) printing are essential in practical applications. To date, most printable thermosets suffer from complicated processes, poor thermodynamic performances, and low printing speed. Here, photosensitive composite inks for fast photocuring printing are developed. The inks consist of epoxy acrylate (EPAc), polyethylene glycol dimethacrylate (PEGDMA), and carbon fillers, which form a firm network structure when exposed to UV light. EPAc is synthesized via addition esterification of epoxy resin and acrylic acid under mild conditions. It is worth noting that raw materials for the reaction are diverse, including not only various epoxy resins but also molecules with epoxy groups. The 4D printing speed of up to 180 mm/h is mainly attributed to the exothermic reaction initiated by free radicals, which accelerates the polymerization of EPAc and PEGDMA. Most importantly, by increasing the exposure time of each layer from 1 s to 3 s during the printing process, the epoxy composite-infilled carbon nanotubes and carbon fibers are printed to ensure the integrity of the microlayer structure. Furthermore, we design a claw-like catcher device based on the above printable composite inks to demonstrate its potential applications in aerospace, such as grasping end-of-service spacecraft or explosive debris. Undoubtedly, 4D printing technology opens up a new portal for the manufacturing of thermoset epoxy composites and complex structures, which make the shape memory thermosetting epoxy resins and their composites possess excellent properties and good engineering application prospects.
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Affiliation(s)
- Linlin Wang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150080, People's Republic of China
| | - Fenghua Zhang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150080, People's Republic of China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), No. 92 West Dazhi Street, Harbin 150001, People's Republic of China
| | - Shanyi Du
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150080, People's Republic of China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 Yikuang Street, Harbin 150080, People's Republic of China
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Wei H, Lei M, Zhang P, Leng J, Zheng Z, Yu Y. Orthogonal photochemistry-assisted printing of 3D tough and stretchable conductive hydrogels. Nat Commun 2021; 12:2082. [PMID: 33828100 PMCID: PMC8027177 DOI: 10.1038/s41467-021-21869-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 02/16/2021] [Indexed: 12/30/2022] Open
Abstract
3D-printing tough conductive hydrogels (TCHs) with complex structures is still a challenging task in related fields due to their inherent contrasting multinetworks, uncontrollable and slow polymerization of conductive components. Here we report an orthogonal photochemistry-assisted printing (OPAP) strategy to make 3D TCHs in one-pot via the combination of rational visible-light-chemistry design and reliable extrusion printing technique. This orthogonal chemistry is rapid, controllable, and simultaneously achieve the photopolymerization of EDOT and phenol-coupling reaction, leading to the construction of tough hydrogels in a short time (tgel ~30 s). As-prepared TCHs are tough, conductive, stretchable, and anti-freezing. This template-free 3D printing can process TCHs to arbitrary structures during the fabrication process. To further demonstrate the merits of this simple OPAP strategy and TCHs, 3D-printed TCHs hydrogel arrays and helical lines, as proofs-of-concept, are made to assemble high-performance pressure sensors and a temperature-responsive actuator. It is anticipated that this one-pot rapid, controllable OPAP strategy opens new horizons to tough hydrogels.
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Affiliation(s)
- Hongqiu Wei
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, China
| | - Ming Lei
- School of Astronautics, Northwestern Polytechnical University, Xi'an, China
| | - Ping Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, China
| | - Zijian Zheng
- Institute of Textiles and Clothing & Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hong Kong, China
| | - You Yu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, China.
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Xie F, Gong X, Huang L, Liu L, Leng J, Liu Y. Effects of accelerated aging on thermal, mechanical, and shape memory properties of a cyanate-based shape memory polymer: II atomic oxygen. Polym Degrad Stab 2021. [DOI: 10.1016/j.polymdegradstab.2021.109515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Lin C, Liu L, Liu Y, Leng J. 4D Printing of Bioinspired Absorbable Left Atrial Appendage Occluders: A Proof-of-Concept Study. ACS Appl Mater Interfaces 2021; 13:12668-12678. [PMID: 33397086 DOI: 10.1021/acsami.0c17192] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The significant mismatch of mechanical properties between the implanted medical device and biological tissue is prone to cause wear and even perforation. In addition, the limited biocompatibility and nondegradability of commercial Nitinol-based occlusion devices can easily lead to other serious complications, such as allergy and corrosion. The present study aims to develop a 4D printed patient-specific absorbable left atrial appendage occluder (LAAO) that can match the deformation of left atrial appendage (LAA) tissue to reduce complications. The desirable bioinspired network is explored by iterative optimization to mimic the stress-strain curve of LAA tissue and LAAOs are designed based on the optimal network. In vitro degradation tests are carried out to evaluate the effects of degradation on mechanical properties. In addition, 48 weeks of long-term subcutaneous implantation of the occluder shows favorable biocompatibility, and the 20-cycle compression test demonstrates outstanding durability of LAAO. Besides, a rapid, complete, and remote-controlled 4D transformation process of LAAO is achieved under the trigger of the magnetic field. The deployment of the LAAO in an isolated swine heart initially exhibits its feasibility for transcatheter LAA occlusion. To the best of our knowledge, this is the first demonstration of the 4D printed LAA occlusion device. It is worth noting that the bioinspired design concept is not only applicable to occlusion devices, but also to many other implantable medical devices, which is conducive to reducing complications, and a broad range of appealing application prospects can be foreseen.
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Affiliation(s)
- Cheng Lin
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin 150001, China
| | - Liwu Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin 150001, China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin 150001, China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China
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Xia Y, He Y, Zhang F, Liu Y, Leng J. A Review of Shape Memory Polymers and Composites: Mechanisms, Materials, and Applications. Adv Mater 2021; 33:e2000713. [PMID: 32969090 DOI: 10.1002/adma.202000713] [Citation(s) in RCA: 231] [Impact Index Per Article: 77.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 05/18/2020] [Indexed: 05/23/2023]
Abstract
Over the past decades, interest in shape memory polymers (SMPs) has persisted, and immense efforts have been dedicated to developing SMPs and their multifunctional composites. As a class of stimuli-responsive polymers, SMPs can return to their initial shape from a programmed temporary shape under external stimuli, such as light, heat, magnetism, and electricity. The introduction of functional materials and nanostructures results in shape memory polymer composites (SMPCs) with large recoverable deformation, enhanced mechanical properties, and controllable remote actuation. Because of these unique features, SMPCs have a broad application prospect in many fields covering aerospace engineering, biomedical devices, flexible electronics, soft robotics, shape memory arrays, and 4D printing. Herein, a comprehensive analysis of the shape recovery mechanisms, multifunctionality, applications, and recent advances in SMPs and SMPCs is presented. Specifically, the combination of functional, reversible, multiple, and controllable shape recovery processes is discussed. Further, established products from such materials are highlighted. Finally, potential directions for the future advancement of SMPs are proposed.
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Affiliation(s)
- Yuliang Xia
- Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin, 150080, P. R. China
| | - Yang He
- Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin, 150080, P. R. China
| | - Fenghua Zhang
- Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin, 150080, P. R. China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin, 150001, P. R. China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin, 150080, P. R. China
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Chu H, Hu X, Wang Z, Mu J, Li N, Zhou X, Fang S, Haines CS, Park JW, Qin S, Yuan N, Xu J, Tawfick S, Kim H, Conlin P, Cho M, Cho K, Oh J, Nielsen S, Alberto KA, Razal JM, Foroughi J, Spinks GM, Kim SJ, Ding J, Leng J, Baughman RH. Unipolar stroke, electroosmotic pump carbon nanotube yarn muscles. Science 2021; 371:494-498. [PMID: 33510023 DOI: 10.1126/science.abc4538] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 12/17/2020] [Indexed: 12/19/2022]
Abstract
Success in making artificial muscles that are faster and more powerful and that provide larger strokes would expand their applications. Electrochemical carbon nanotube yarn muscles are of special interest because of their relatively high energy conversion efficiencies. However, they are bipolar, meaning that they do not monotonically expand or contract over the available potential range. This limits muscle stroke and work capacity. Here, we describe unipolar stroke carbon nanotube yarn muscles in which muscle stroke changes between extreme potentials are additive and muscle stroke substantially increases with increasing potential scan rate. The normal decrease in stroke with increasing scan rate is overwhelmed by a notable increase in effective ion size. Enhanced muscle strokes, contractile work-per-cycle, contractile power densities, and energy conversion efficiencies are obtained for unipolar muscles.
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Affiliation(s)
- Hetao Chu
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA.,Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China
| | - Xinghao Hu
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA.,Institute of Intelligent Flexible Mechatronics, Jiangsu University, Zhenjiang 212013, China
| | - Zhong Wang
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA.,Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Jiuke Mu
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Na Li
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA.,MilliporeSigma, Materials Science, Milwaukee, WI 53209, USA
| | - Xiaoshuang Zhou
- Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Shaoli Fang
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Carter S Haines
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA.,Opus 12 Incorporated, Berkeley, CA 94710, USA
| | - Jong Woo Park
- Center for Self-Powered Actuation, Department of Biomedical Engineering, Hanyang University, Seoul 04763, South Korea
| | - Si Qin
- Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia
| | - Ningyi Yuan
- Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Jiang Xu
- Institute of Intelligent Flexible Mechatronics, Jiangsu University, Zhenjiang 212013, China
| | - Sameh Tawfick
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA
| | - Hyungjun Kim
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080, USA.,Department of Mechanical and Aerospace Engineering, Seoul National University, Gwanak-gu, Seoul 08826, The Republic of Korea
| | - Patrick Conlin
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Maenghyo Cho
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080, USA.,Department of Mechanical and Aerospace Engineering, Seoul National University, Gwanak-gu, Seoul 08826, The Republic of Korea
| | - Kyeongjae Cho
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Jiyoung Oh
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Steven Nielsen
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Kevin A Alberto
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, TX 75080, USA
| | - Joselito M Razal
- Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia
| | - Javad Foroughi
- Faculty of Engineering and Information Sciences, University of Wollongong, Australia, Wollongong, New South Wales 2500, Australia
| | - Geoffrey M Spinks
- Intelligent Polymer Research Institute, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - Seon Jeong Kim
- Center for Self-Powered Actuation, Department of Biomedical Engineering, Hanyang University, Seoul 04763, South Korea
| | - Jianning Ding
- Institute of Intelligent Flexible Mechatronics, Jiangsu University, Zhenjiang 212013, China. .,Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, China.
| | - Ray H Baughman
- Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75080, USA.
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Zhang F, Zhao T, Ruiz-Molina D, Liu Y, Roscini C, Leng J, Smoukov SK. Shape Memory Polyurethane Microcapsules with Active Deformation. ACS Appl Mater Interfaces 2020; 12:47059-47064. [PMID: 32991802 DOI: 10.1021/acsami.0c14882] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
From smart self-tightening sutures and expandable stents to morphing airplane wings, shape memory structures are increasingly present in our daily life. The lack of methods for synthesizing intricate structures from them on the micron and submicron level, however, is stopping the field from developing. In particular, the methods for the synthesis of shape memory polymers (SMPs) and structures at this scale and the effect of new geometries remain unexplored. Here, we describe the synthesis of shape memory polyurethane (PU) capsules accomplished by interfacial polymerization of emulsified droplets. The emulsified droplets contain the monomers for the hard segments, while the continuous aqueous phase contains the soft segments. A trifunctional chemical cross-linker for shape memory PU synthesis was utilized to eliminate creep and improve the recovery ratios of the final capsules. We observe an anomalous dependence of the recovery ratio with the amount of programmed strain compared to previous SMPs. We develop quantitative characterization methods and theory to show that when dealing with thin-shell objects, alternative parameters to quantify recovery ratios are needed. We show that while achieving 94-99% area recovery ratios, the linear capsule recovery ratios can be as low as 70%. This quantification method allows us to convert from observed linear aspect ratios in capsules to find out unrecovered area strain and stress. The hollow structure of the capsules grants high internal volume for some applications (e.g., drug delivery), which benefit from much higher loading of active ingredients than polymeric particles. The methods we developed for capsule synthesis and programming could be easily scaled up for larger volume applications.
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Affiliation(s)
- Fenghua Zhang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 YiKuang Street, P.O. Box 3011, Harbin 150080, People's Republic of China
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, U.K
| | - Tianheng Zhao
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, U.K
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Daniel Ruiz-Molina
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra 08193, Barcelona, Spain
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), No. 92 West Dazhi Street, P.O. Box 301, Harbin 150001, People's Republic of China
| | - Claudio Roscini
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra 08193, Barcelona, Spain
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), No. 2 YiKuang Street, P.O. Box 3011, Harbin 150080, People's Republic of China
| | - Stoyan K Smoukov
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, U.K
- School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, U.K
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41
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Daniels SP, Leng J, Swann JR, Proudman CJ. Bugs and drugs: a systems biology approach to characterising the effect of moxidectin on the horse's faecal microbiome. Anim Microbiome 2020; 2:38. [PMID: 33499996 PMCID: PMC7807906 DOI: 10.1186/s42523-020-00056-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 10/02/2020] [Indexed: 02/08/2023] Open
Abstract
Background Anthelmintic treatment is a risk factor for intestinal disease in the horse, known as colic. However the mechanisms involved in the onset of disease post anthelmintic treatment are unknown. The interaction between anthelmintic drugs and the gut microbiota may be associated with this observed increase in risk of colic. Little is known about the interaction between gut microbiota and anthelmintics and how treatment may alter microbiome function. The objectives of this study were: To characterise (1) faecal microbiota, (2) feed fermentation kinetics in vitro and (3) metabolic profiles following moxidectin administration to horses with very low (0 epg) adult strongyle burdens. Hypothesis: Moxidectin will not alter (1) faecal microbiota, (2) feed fermentation in vitro, or, (3) host metabolome. Results Moxidectin increased the relative abundance of Deferribacter spp. and Spirochaetes spp. observed after 160 h in moxidectin treated horses. Reduced in vitro fibre fermentation was observed 16 h following moxidectin administration in vivo (P = 0.001), along with lower pH in the in vitro fermentations from the moxidectin treated group. Metabolic profiles from urine samples did not differ between the treatment groups. However metabolic profiles from in vitro fermentations differed between moxidectin and control groups 16 h after treatment (R2 = 0.69, Q2Y = 0.48), and within the moxidectin group between 16 h and 160 h post moxidectin treatment (R2 = 0.79, Q2Y = 0.77). Metabolic profiles from in vitro fermentations and fermentation kinetics both indicated altered carbohydrate metabolism following in vivo treatment with moxidectin. Conclusions These data suggest that in horses with low parasite burdens moxidectin had a small but measurable effect on both the community structure and the function of the gut microbiome.
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Affiliation(s)
- S P Daniels
- School of Equine Management and Science, Royal Agricultural University, Cirencester, Gloucestershire, GL9 6JS, UK. .,School of Veterinary Medicine, University of Surrey, Guildford, Surrey, GU2 7TE, UK.
| | - J Leng
- School of Veterinary Medicine, University of Surrey, Guildford, Surrey, GU2 7TE, UK
| | - J R Swann
- Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London, SW7 2AZ, UK
| | - C J Proudman
- School of Veterinary Medicine, University of Surrey, Guildford, Surrey, GU2 7TE, UK
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42
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Guan Q, Sun J, Liu Y, Wereley NM, Leng J. Novel Bending and Helical Extensile/Contractile Pneumatic Artificial Muscles Inspired by Elephant Trunk. Soft Robot 2020; 7:597-614. [DOI: 10.1089/soro.2019.0079] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Affiliation(s)
- Qinghua Guan
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, China
| | - Jian Sun
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin, People's Republic of China
| | - Norman M. Wereley
- Department of Aerospace Engineering, University of Maryland, College Park, Maryland, USA
| | - Jinsong Leng
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, China
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43
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Li Y, Li J, Liu L, Yan Y, Zhang Q, Zhang N, He L, Liu Y, Zhang X, Tian D, Leng J, Jiang L. Switchable Wettability and Adhesion of Micro/Nanostructured Elastomer Surface via Electric Field for Dynamic Liquid Droplet Manipulation. Adv Sci (Weinh) 2020; 7:2000772. [PMID: 32999834 PMCID: PMC7509640 DOI: 10.1002/advs.202000772] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 06/11/2020] [Indexed: 05/13/2023]
Abstract
Dynamic control of liquid wetting behavior on smart surfaces has attracted considerable concern owing to their important applications in directional motion, confined wetting and selective separation. Despite much progress in this regard, there still remains challenges in dynamic liquid droplet manipulation with fast response, no loss and anti-contamination. Herein, a strategy to achieve dynamic droplet manipulation and transportation on the electric field adaptive superhydrophobic elastomer surface is demonstrated. The superhydrophobic elastomer surface is fabricated by combining the micro/nanostructured clusters of hydrophobic TiO2 nanoparticles with the elastomer film, on which the micro/nanostructure can be dynamically and reversibly tuned by electric field due to the electric field adaptive deformation of elastomer film. Accordingly, fast and reversible transition of wetting state between Cassie state and Wenzel state and tunable adhesion on the surface via electric field induced morphology transformation can be obtained. Moreover, the motion states of the surface droplets can be controlled dynamically and precisely, such as jumping and pinning, catching and releasing, and controllable liquid transfer without loss and contamination. Thus this work would open the avenue for dynamic liquid manipulation and transportation, and gear up the broad application prospects in liquid transfer, selective separation, anti-fog, anti-ice, microfluidics devices, etc.
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Affiliation(s)
- Yan Li
- Key Laboratory of Bio‐Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang UniversityBeijing100191P. R. China
| | - Jinrong Li
- National Key Laboratory of Science and Technology on Advanced Composites in Special EnvironmentsHarbin Institute of TechnologyHarbinHeilongjiang150080P. R. China
| | - Liwu Liu
- Department of Astronautical Science and MechanicsHarbin Institute of TechnologyHarbinHeilongjiang150001P. R. China
| | - Yufeng Yan
- Key Laboratory of Bio‐Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang UniversityBeijing100191P. R. China
| | - Qiuya Zhang
- Key Laboratory of Bio‐Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang UniversityBeijing100191P. R. China
| | - Na Zhang
- Key Laboratory of Bio‐Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang UniversityBeijing100191P. R. China
| | - Linlin He
- Key Laboratory of Bio‐Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang UniversityBeijing100191P. R. China
| | - Yanju Liu
- Department of Astronautical Science and MechanicsHarbin Institute of TechnologyHarbinHeilongjiang150001P. R. China
| | - Xiaofang Zhang
- School of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing100083P. R. China
| | - Dongliang Tian
- Key Laboratory of Bio‐Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang UniversityBeijing100191P. R. China
- Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing100191P. R. China
| | - Jinsong Leng
- National Key Laboratory of Science and Technology on Advanced Composites in Special EnvironmentsHarbin Institute of TechnologyHarbinHeilongjiang150080P. R. China
| | - Lei Jiang
- Key Laboratory of Bio‐Inspired Smart Interfacial Science and Technology of Ministry of EducationSchool of ChemistryBeihang UniversityBeijing100191P. R. China
- Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing100191P. R. China
- Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100191P. R. China
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Wan X, Luo L, Liu Y, Leng J. Direct Ink Writing Based 4D Printing of Materials and Their Applications. Adv Sci (Weinh) 2020; 7:2001000. [PMID: 32832355 PMCID: PMC7435246 DOI: 10.1002/advs.202001000] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 05/30/2020] [Indexed: 05/19/2023]
Abstract
4D printing has attracted academic interest in the recent years because it endows static printed structures with dynamic properties with the change of time. The shapes, functionalities, or properties of the 4D printed objects could alter under various stimuli such as heat, light, electric, and magnetic field. Briefly, 4D printing is the development of 3D printing with the fourth dimension of time. Among the fabrication techniques that have been employed for 4D printing, the direct ink writing technique shows superiority due to its open source for various types of materials. Herein, the state-of-the-art achievements about the topic of 4D printing through direct ink writing are summarized. The types of materials, printing strategies, actuated methods, and their potential applications are discussed in detail. To date, most efforts have been devoted to shape-shifting materials, including shape memory polymers, hydrogels, and liquid crystal elastomers, showing great prospects in areas ranging from the biomedical field to robotics. Finally, the current challenges and outlook toward 4D printing based on direct ink writing are also pointed out to leave open a significant space for future innovation.
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Affiliation(s)
- Xue Wan
- Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin150080P. R. China
| | - Lan Luo
- Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin150080P. R. China
| | - Yanju Liu
- Department of Astronautical Science and MechanicsHarbin Institute of TechnologyHarbin150001P. R. China
| | - Jinsong Leng
- Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin150080P. R. China
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46
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Abstract
Shape memory polymers (SMPs) are macromolecules in which linear chains and crosslinking points play a key role in providing a shape memory effect. As smart polymers, SMPs have the ability to change shape, stiffness, size, and structure when exposed to external stimuli, leading to potential uses for SMPs throughout our daily lives in a diverse range of areas including the aerospace and automotive industries, robotics, biomedical engineering, smart textiles, and tactile devices. SMPs can be fabricated in many forms and sizes from the nanoscale to the macroscale, including nanofibers, nanoparticles, thin films, microfoams, and bulk devices. The introduction of nanostructure into SMPs can result in enhanced mechanical properties, unique structural color, specific surface area, and multiple functions. It is necessary to enhance the current understanding of the various nano/microstructures of SMPs and their fabrication, and to find suitable approaches for constructing SMP-based nano/microstructures for different applications. In this review, we summarize the current state of different SMP nano/microstructures, fabrication techniques, and applications, and give suggestions for their future development.
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Affiliation(s)
- Fenghua Zhang
- National Key Laboratory of Science and Technology on Advanced Composites in Special Enviroments, Harbin Institute of Technology (HIT), Harbin 150080, P. R. China.
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48
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Fu JD, Yao JJ, Wang H, Cui WG, Leng J, Ding LY, Fan KY. Effects of EGCG on proliferation and apoptosis of gastric cancer SGC7901 cells via down-regulation of HIF-1α and VEGF under a hypoxic state. Eur Rev Med Pharmacol Sci 2020; 23:155-161. [PMID: 30657557 DOI: 10.26355/eurrev_201901_16759] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
OBJECTIVE To investigate the effects of epigallocatechin-3-gallate (EGCG) on proliferation and apoptosis of human gastric cancer SGC7901 cells under a hypoxic state. MATERIALS AND METHODS Human gastric cancer SGC7901 cells were sub-cultured, and the cobalt chloride (CoCl2) hypoxia model was established. The blank control group (normoxia group), hypoxia control group (hypoxia group) and hypoxia + different concentrations of EGCG subgroups (20, 40, 60, 80, 100 μg/mL EGCG) were set up. Cell viability was detected via methyl thiazolyl tetrazolium (MTT) assay, apoptosis was detected via flow cytometry, and expressions of hypoxia-inducible factor-1α (HIF-1α) and vascular endothelial growth factor (VEGF) were detected via reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting. RESULTS Relatively low concentrations of EGCG (20-80 μg/mL) presented no significant inhibiting effect on SGC7901 cell growth within a short time (24 h) (p>0.05). The increasing concentration of EGCG inhibited cell proliferation under a hypoxia state (p<0.05). EGCG induced apoptosis in a dose-dependent manner under hypoxia (p<0.05). EGCG could significantly impede expressions of HIF-1α and VEGF proteins (p<0.05), and down-regulate the level of VEGF mRNA (p<0.05), but it showed no significant effect on the HIF-1α mRNA expression (p>0.05). CONCLUSIONS EGCG inhibited cell proliferation under hypoxia via the downregulation of HIF-1α and its downstream target gene VEGF levels, providing a theoretical basis for the early diagnosis and treatment of gastric cancer in clinic.
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Affiliation(s)
- J-D Fu
- Department of Digestive Disease, People's Hospital of Rizhao, Affiliated Clinical Hospital of Jining Medical Univerity, Jining Medical University, Rizhao, Shandong, China.
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Huang X, Zhang F, Liu Y, Leng J. Active and Deformable Organic Electronic Devices based on Conductive Shape Memory Polyimide. ACS Appl Mater Interfaces 2020; 12:23236-23243. [PMID: 32338861 DOI: 10.1021/acsami.0c04635] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Smart, deformable, and transparent electrodes are a significant part of flexible optoelectronic devices. In this work, a novel approach to making highly transparent, smooth, and conductive shape memory polyimide hybrids has been proposed. Colorless shape memory polyimide (CSMPI) with high optical transparency and high heat resistance is served as the substrate for flexible electronic devices for the first time. A hybrid (Au/Ag) metal grid electrode embedded in CSMPI (BMG/CSMPI) is first fabricated via self-cracking template and solution-coating, the advantages of which include ultrasmooth surface, superior mechanical flexibility and durability, strong surface adhesion, and excellent chemical stability due to the unique embedded hybrid structure. The resulting white polymer light emitting diodes (WPLEDs) based on BMG/CSMPI with shape memory effect are active and deformable, and are converted from 2D device into 3D devices depending on its variable stiffness characteristics. The deformed 3D devices could actively recover to the original shape upon heating. Furthermore, ultrathin and flexible 3D optoelectronic devices fabricated using shape memory polymers can promote the development of advanced optoelectronic applications in the future.
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Affiliation(s)
- Xinzuo Huang
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology (HIT), Harbin, 150080, PR China
| | - Fenghua Zhang
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology (HIT), Harbin, 150080, PR China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin, 150001, PR China
| | - Jinsong Leng
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology (HIT), Harbin, 150080, PR China
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50
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Lan X, Liu L, Liu Y, Leng J. Thermomechanical properties and deformation behavior of a unidirectional carbon‐fiber‐reinforced shape memory polymer composite laminate. J Appl Polym Sci 2020. [DOI: 10.1002/app.48532] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xin Lan
- Center for Composite MaterialsHarbin Institute of Technology (HIT) Harbin 150080 People's Republic of China
| | - Liwu Liu
- Department of Aerospace Science and MechanicsHarbin Institute of Technology (HIT) Harbin 150001 People's Republic of China
| | - Yanju Liu
- Department of Aerospace Science and MechanicsHarbin Institute of Technology (HIT) Harbin 150001 People's Republic of China
| | - Jinsong Leng
- Center for Composite MaterialsHarbin Institute of Technology (HIT) Harbin 150080 People's Republic of China
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