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Altheeb F, Elshafiey I, Altamimi M, Sheta AFA. Customized Millimeter Wave Channel Model for Enhancement of Next-Generation UAV-Aided Internet of Things Networks. Sensors (Basel) 2024; 24:1528. [PMID: 38475064 DOI: 10.3390/s24051528] [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: 01/06/2024] [Revised: 02/22/2024] [Accepted: 02/22/2024] [Indexed: 03/14/2024]
Abstract
The success of next-generation Internet of Things (IoT) applications could be boosted with state-of-the-art communication technologies, including the operation of millimeter-wave (mmWave) bands and the implementation of three-dimensional (3D) networks. With some access points (APs) mounted on unmanned aerial vehicles (UAVs), the probability of line-of-sight (LoS) connectivity to IoT nodes could be augmented to address the high path loss at mmWave bands. Nevertheless, system optimization is essential to maintaining reliable communication in 3D IoT networks, particularly in dense urban areas with elevated buildings. This research adopts the implementation of a geometry-based stochastic channel model. The model customizes the standard clustered delay line (CDL) channel profile based on the environmental geometry of the site to obtain realistic performance and optimize system design. Simulation validation is conducted based on the actual maps of highly dense urban areas to demonstrate that the proposed approach is comprehensive. The results reveal that the use of standard channel models in the analysis introduces errors in the channel quality indicator (CQI) that can exceed 50% due to the effect of the environmental geometry on the channel profile. The results also quantify accuracy improvements in the wireless channel and network performance in terms of the CQI and downlink (DL) throughput.
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Affiliation(s)
- Faisal Altheeb
- Electrical Engineering Department, King Saud University, Riyadh 12372, Saudi Arabia
| | - Ibrahim Elshafiey
- Electrical Engineering Department, King Saud University, Riyadh 12372, Saudi Arabia
| | - Majid Altamimi
- Electrical Engineering Department, King Saud University, Riyadh 12372, Saudi Arabia
| | - Abdel-Fattah A Sheta
- Electrical Engineering Department, King Saud University, Riyadh 12372, Saudi Arabia
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Hu J, Ma H, Zhou Y, Ma L, Zhao S, Shi S, Li J, Chang Y. Gas-Sensing Properties and Mechanisms of 3D Networks Composed of ZnO Tetrapod Micro-Nano Structures at Room Temperature. Materials (Basel) 2023; 17:203. [PMID: 38204056 PMCID: PMC10780012 DOI: 10.3390/ma17010203] [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: 10/30/2023] [Revised: 12/21/2023] [Accepted: 12/27/2023] [Indexed: 01/12/2024]
Abstract
Metal oxide semiconductors (MOSs) hold great promise for electronic devices such as gas sensors. The utilization of ZnO as a conductometric gas sensor material can be traced back to its early stages; however, its application has primarily been limited to high-temperature environments. A gas sensor based on highly porous and interconnected 3D networks of ZnO tetrapod (ZnO-T) micro-nano structures was fabricated via an easy chemical vapor deposition (CVD) method. Homemade instruments were utilized to evaluate the gas-sensing of the sample at room temperature. It exhibited good gas-sensing at room temperature, particularly with a response of up to 338.80% toward 1600 ppm ethanol, while also demonstrating remarkable repeatability, stability, and selectivity. Moreover, the unique gas-sensing properties of ZnO-T at room temperature can be reasonably explained by considering the effect of van der Waals forces in physical adsorption and the synergistic effect of carrier concentration and mobility. The aforementioned statement presents an opportunity for the advancement of gas sensors utilizing ZnO at room temperature.
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Affiliation(s)
- Jinjiang Hu
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Department of Mathematics and Physics, Hebei University of Architecture, Zhangjiakou 075000, China; (H.M.); (Y.Z.); (L.M.); (S.Z.); (S.S.); (J.L.)
- Zhangjiakou Smart Control Technology Innovation Center, Zhangjiakou 075000, China
| | - Hong Ma
- Department of Mathematics and Physics, Hebei University of Architecture, Zhangjiakou 075000, China; (H.M.); (Y.Z.); (L.M.); (S.Z.); (S.S.); (J.L.)
| | - Yang Zhou
- Department of Mathematics and Physics, Hebei University of Architecture, Zhangjiakou 075000, China; (H.M.); (Y.Z.); (L.M.); (S.Z.); (S.S.); (J.L.)
| | - Liyong Ma
- Department of Mathematics and Physics, Hebei University of Architecture, Zhangjiakou 075000, China; (H.M.); (Y.Z.); (L.M.); (S.Z.); (S.S.); (J.L.)
| | - Shuyin Zhao
- Department of Mathematics and Physics, Hebei University of Architecture, Zhangjiakou 075000, China; (H.M.); (Y.Z.); (L.M.); (S.Z.); (S.S.); (J.L.)
| | - Shuzheng Shi
- Department of Mathematics and Physics, Hebei University of Architecture, Zhangjiakou 075000, China; (H.M.); (Y.Z.); (L.M.); (S.Z.); (S.S.); (J.L.)
| | - Jirong Li
- Department of Mathematics and Physics, Hebei University of Architecture, Zhangjiakou 075000, China; (H.M.); (Y.Z.); (L.M.); (S.Z.); (S.S.); (J.L.)
| | - Yongqin Chang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
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Manjunatha Y, Sharma V, Iwahori Y, Bhuyan MK, Wang A, Ouchi A, Shimizu Y. Lymph node detection in CT scans using modified U-Net with residual learning and 3D deep network. Int J Comput Assist Radiol Surg 2023; 18:723-732. [PMID: 36630071 DOI: 10.1007/s11548-022-02822-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 05/08/2022] [Accepted: 12/20/2022] [Indexed: 01/12/2023]
Abstract
PURPOSE Lymph node (LN) detection is a crucial step that complements the diagnosis and treatments involved during cancer investigations. However, the low-contrast structures in the CT scan images and the nodes' varied shapes, sizes, and poses, along with their sparsely distributed locations, make the detection step challenging and lead to many false positives. The manual examination of the CT scan slices could be time-consuming, and false positives could divert the clinician's focus. To overcome these issues, our work aims at providing an automated framework for LNs detection in order to obtain more accurate detection results with low false positives. METHODS The proposed work consists of two stages: candidate generation and false positive reduction. The first stage generates volumes of interest (VOI) of probable LN candidates using a modified U-Net with ResNet architecture to obtain high sensitivity but with the cost of increased false positives. The second-stage processes the obtained candidate LNs for false positive reduction using 3D convolutional neural network (CNN) classifier. We further present an analysis of various deep learning models while decomposing 3D VOI into different representations. RESULTS The method is evaluated on two publicly available datasets containing CT scans of mediastinal and abdominal LNs. Our proposed approach yields sensitivities of 87% at 2.75 false positives per volume (FP/vol.) and 79% at 1.74 FP/vol. with the mediastinal and abdominal datasets, respectively. Our method presented a competitive performance in terms of sensitivity compared to the state-of-the-art methods and encountered very few false positives. CONCLUSION We developed an automated framework for LNs detection using a modified U-Net with residual learning and 3D CNNs. The results indicate that our method could achieve high sensitivity with relatively low false positives, which helps avoid ineffective treatments.
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Affiliation(s)
- Yashwanth Manjunatha
- Dept. of Electronics & Electrical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Vanshali Sharma
- Dept. of Computer Science & Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.
| | - Yuji Iwahori
- Dept. of Computer Science, Chubu University, Kasugai, 487-8501, Japan
| | - M K Bhuyan
- Dept. of Electronics & Electrical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
- Mehta Family School of Data Science and Artificial Intelligence, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Aili Wang
- Higher Educational Key Laboratory for Measuring and Control Technology and Instrumentations of Heilongjiang, Harbin University of Science and Technology, Harbin, 150080, China
| | - Akira Ouchi
- Dept. of Gastroenterological Surgery, Aichi Cancer Center Hospital, Nagoya, 464-8681, Japan
| | - Yasuhiro Shimizu
- Dept. of Gastroenterological Surgery, Aichi Cancer Center Hospital, Nagoya, 464-8681, Japan
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Pietsch K, Storm-Johannsen L, Schmidt-Thomée A, Pompe T. Correlation between Fibrin Fibrillation Kinetics and the Resulting Fibrin Network Microstructure. Adv Healthc Mater 2023; 12:e2202231. [PMID: 36494086 DOI: 10.1002/adhm.202202231] [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: 09/01/2022] [Revised: 11/27/2022] [Indexed: 12/14/2022]
Abstract
Fibrin, the prominent extracellular matrix in early wound tissue, is discussed to influence immune cells and healing. The nature of fibrinogen/fibrin to form fibrillary networks is frequently exploited to engineer microenvironments for cellular analysis. This study focuses on revealing the correlation of fibril formation kinetic and the resulting network microstructure of engineered 3D fibrin networks. Different concentrations of fibrinogen (1-3 mg mL-1 ), thrombin (0.01-0.15 U mL-1 ), sodium chloride (40-120 mm), and calcium chloride (1-10 mm) are applied to assess the impact on the fibril growth kinetics by turbidity analysis and on the resulting fibril and pore diameter by laser scanning microscopy. The results highlight a direct influence of the sodium chloride concentration on fibrillation kinetics and reveal a strong correlation between fibrillation kinetics and network microstructure. With the assumption of a first-order growth kinetic, an increase of the growth constant k (0.015-0.04 min-1 ) is found to correlate to a decrease in fibril diameter (1-0.65 µm) and pore diameter (11-5 µm). The new findings enable an easy prediction of 3D fibrin network microstructure by the fibril formation kinetic and contribute to an improved engineering of defined scaffolds for tissue engineering and cell culture applications.
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Affiliation(s)
- Katja Pietsch
- Institute of Biochemistry, Leipzig University, Johannisallee 21-23, 04103, Leipzig, Germany
| | - Lisa Storm-Johannsen
- Institute of Biochemistry, Leipzig University, Johannisallee 21-23, 04103, Leipzig, Germany
| | - Antonia Schmidt-Thomée
- Institute of Biochemistry, Leipzig University, Johannisallee 21-23, 04103, Leipzig, Germany
| | - Tilo Pompe
- Institute of Biochemistry, Leipzig University, Johannisallee 21-23, 04103, Leipzig, Germany
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Huang Z, Dang C, Sun Z, Qi H. High-Efficiency Air Filter Media with a Three-Dimensional Network Composed of Core-Shell Zeolitic Imidazolate Framework-8@Tunicate Nanocellulose for PM0.3 Removal. ACS Appl Mater Interfaces 2021; 13:57921-57929. [PMID: 34797631 DOI: 10.1021/acsami.1c17052] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Particulate matter (PM) in air has seriously endangered human health. Especially, PM0.3 can easily enter the lungs and blood through breathing. Herein, an air filter with a three-dimensional (3D) network consisting of core-shell structured fibers was designed by in situ growth of zeolitic imidazolate framework-8 on tunicate nanocellulose/glass fiber composite filter media (ZIF-8@TNC/GF). The filtration performance of the obtained ZIF-8@TNC/GF membranes against sodium chloride particles with the MPPS (most penetrating particle size) was investigated. The air filter media at the optimal ratio of ZIF-8 exhibited an ultrahigh efficiency of 99.998% and a quality factor of 0.0308 Pa-1 for PM0.3. Further characterizations showed that the ZIF-8@TNC/GF air filter had a hierarchical and rich pore structure, showing a large specific surface area (50.3 m2 g-1). More significantly, compared with the TNC/GF prepared by the dipping method, TNCs changed from the original two-dimensional (2D) nonuniform network to a uniform 3D network after the ZIF-8 was introduced. Moreover, the ZIF-8@TNC fibers with a core-shell structure inhibited the aggregation of nanocellulose. This study will shed light on the fabrication of high-efficiency TNC composite air filter media with fluffy 3D networks.
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Affiliation(s)
- Zhongyuan Huang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, GuangZhou 510641, China
| | - Chao Dang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, GuangZhou 510641, China
| | - Zhaoxia Sun
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, GuangZhou 510641, China
| | - Haisong Qi
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, GuangZhou 510641, China
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Yang Y, Mallick S, Izquierdo-Ruiz F, Schäfer C, Xing X, Rahm M, Börjesson K. A Highly Conductive All-Carbon Linked 3D Covalent Organic Framework Film. Small 2021; 17:e2103152. [PMID: 34494364 DOI: 10.1002/smll.202103152] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 07/18/2021] [Indexed: 06/13/2023]
Abstract
Here an all-carbon linked 3D covalent organic framework (COF) is introduced by employing a templated surface reaction in a continuous flow (TSRCF). The presented method of synthesis provides spatial control over the reaction chemistry and allows for the creation of ultrasmooth COF films of desired thickness and significant crystallinity. The films show high electrical conductivity (≈3.4 S m-1 ) after being doped with tetracyanoquinodimethane (TCNQ), setting a new record for 3D COF materials. The concurrence of 3D nanosized channels and high conductivity opens up for a number of hitherto unexplored applications for this class of materials, such as high surface area electrodes, electrochemical transistors, and for electronic sensing.
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Affiliation(s)
- Yizhou Yang
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, Gothenburg, 41296, Sweden
| | - Suman Mallick
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, Gothenburg, 41296, Sweden
| | - Fernando Izquierdo-Ruiz
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemivägen 10, Gothenburg, 41296, Sweden
| | - Clara Schäfer
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, Gothenburg, 41296, Sweden
| | - Xing Xing
- Research & Development Institute of Northwestern Polytechnical University (Shenzhen), Shenzhen, 518057, China
| | - Martin Rahm
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemivägen 10, Gothenburg, 41296, Sweden
| | - Karl Börjesson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, Gothenburg, 41296, Sweden
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7
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Liu X, Wu W, Liu C, Wang Y, Chen Q, Cui S. Preparation and mechanism research of bio-inspired dopamine decorated expanded graphite/silicone rubber composite with high thermal conductivity and excellent insulation. Nanotechnology 2021; 32:325702. [PMID: 33902011 DOI: 10.1088/1361-6528/abfb9d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 04/26/2021] [Indexed: 06/12/2023]
Abstract
This study looked at the process of designing and synthesized expanded graphite (EG) and modifying it with bio-inspired dopamine (DOPA). This is a process used to improve the thermal conductivity and dielectric properties of methyl vinyl silicone rubber (VMQ). The results demonstrated that the EG-DOPA-VMQ composites acquired an exceptional thermal conductivity of 1.015 W mK-1at the loading of 10 wt%, approximately 480% higher than that of pure silicone rubber (0.175 W mK-1). This enhancement is mainly attributed to the improved dispersion capability of EG-DOPA and the robust interfacial interaction between EG-DOPA-VMQ interfaces; specifically, this is the result when compared with pristine EG. Moreover, throughout this process, the composites maintained an excellent insulating property with a resistance of ≈1012Ω · cm; this particular result was due to the DOPA deposited on EG surfaces because they acted as an insulating layer, inhibiting the electron transfer in composites. Overall, this work demonstrated that it could present a promising strategy for synchronized manufacturing of polymer composites with high thermal conductivity and insulating capability.
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Affiliation(s)
- Xingrong Liu
- Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, People's Republic of China
| | - Wei Wu
- Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, People's Republic of China
| | - Chao Liu
- Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, People's Republic of China
| | - Yi Wang
- Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, People's Republic of China
| | - Qiming Chen
- Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, People's Republic of China
| | - Sufei Cui
- Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, People's Republic of China
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Thurakkal S, Feldstein D, Perea-Causín R, Malic E, Zhang X. The Art of Constructing Black Phosphorus Nanosheet Based Heterostructures: From 2D to 3D. Adv Mater 2021; 33:e2005254. [PMID: 33251663 DOI: 10.1002/adma.202005254] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 10/08/2020] [Indexed: 06/12/2023]
Abstract
Assembling different kinds of 2D nanosheets into heterostructures presents a promising way of designing novel artificial materials with new and improved functionalities by combining the unique properties of each component. In the past few years, black phosphorus nanosheets (BPNSs) have been recognized as a highly feasible 2D material with outstanding electronic properties, a tunable bandgap, and strong in-plane anisotropy, highlighting their suitability as a material for constructing heterostructures. In this study, recent progress in the construction of BPNS-based heterostructures ranging from 2D hybrid structures to 3D networks is discussed, emphasizing the different types of interactions (covalent or noncovalent) between individual layers. The preparation methods, optical and electronic properties, and various applications of these heterostructures-including electronic and optoelectronic devices, energy storage devices, photocatalysis and electrocatalysis, and biological applications-are discussed. Finally, critical challenges and prospective research aspects in BPNS-based heterostructures are also highlighted.
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Affiliation(s)
- Shameel Thurakkal
- Division of Chemistry and Biochemistry, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, Göteborg, SE-412 96, Sweden
| | - David Feldstein
- Division of Condensed Matter and Materials Theory, Department of Physics, Chalmers University of Technology, Kemigården 1, Göteborg, SE-412 96, Sweden
| | - Raül Perea-Causín
- Division of Condensed Matter and Materials Theory, Department of Physics, Chalmers University of Technology, Kemigården 1, Göteborg, SE-412 96, Sweden
| | - Ermin Malic
- Division of Condensed Matter and Materials Theory, Department of Physics, Chalmers University of Technology, Kemigården 1, Göteborg, SE-412 96, Sweden
| | - Xiaoyan Zhang
- Division of Chemistry and Biochemistry, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigården 4, Göteborg, SE-412 96, Sweden
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9
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Pan H, Xie G, Pang W, Wang S, Wang Y, Jiang Z, Du X, Tai H. Surface Engineering of a 3D Topological Network for Ultrasensitive Piezoresistive Pressure Sensors. ACS Appl Mater Interfaces 2020; 12:38805-38812. [PMID: 32805963 DOI: 10.1021/acsami.0c11658] [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
Polypyrrole (PPy) is a good candidate material for piezoresistive pressure sensors owing to its excellent electrical conductivity and good biocompatibility. However, it remains challenging to fabricate PPy-based flexible piezoresistive pressure sensors with high sensitivity because of the intrinsic rigidity and brittleness of the film composed of dense PPy particles. Here, a rational structure, that is, 3D-conductive and elastic topological film composed of coaxial nanofiber networks, is reported to dramatically improve the sensitivity of flexible PPy-based sensors. The film is prepared through surface modification of electrospun polyvinylidene fluoride (PVDF) nanofibers by polydopamine (PDA), in order to homogeneously deposit PPy particles on the nanofiber networks with strong interfacial adhesion (PVDF/PDA/PPy, PPP). This unique structure has a high surface area and abundant contact sites, leading to superb sensitivity against a subtle pressure. The as-developed piezoresistive pressure sensor delivers a low limit of detection (0.9 Pa), high sensitivity (139.9 kPa-1), fast response (22 ms), good cycling stability (over 10,000 cycles), and reliability, thereby showing a promising value for applications in the fields of health monitoring and artificial intelligence.
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Affiliation(s)
- Hong Pan
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, PR China
| | - Guangzhong Xie
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, PR China
| | - Wenqian Pang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, PR China
| | - Si Wang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, PR China
| | - Yang Wang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, PR China
| | - Zhi Jiang
- Electrical and Electronic Engineering and Information Systems, The University of Tokyo, 113-8656 Tokyo, Japan
| | - Xiaosong Du
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, PR China
| | - Huiling Tai
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, PR China
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Onesto V, Accardo A, Vieu C, Gentile F. Small-world networks of neuroblastoma cells cultured in three-dimensional polymeric scaffolds featuring multi-scale roughness. Neural Regen Res 2020; 15:759-768. [PMID: 31638101 PMCID: PMC6975141 DOI: 10.4103/1673-5374.266923] [Citation(s) in RCA: 5] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Understanding the mechanisms underlying cell-surface interaction is of fundamental importance for the rational design of scaffolds aiming at tissue engineering, tissue repair and neural regeneration applications. Here, we examined patterns of neuroblastoma cells cultured in three-dimensional polymeric scaffolds obtained by two-photon lithography. Because of the intrinsic resolution of the technique, the micrometric cylinders composing the scaffold have a lateral step size of ~200 nm, a surface roughness of around 20 nm, and large values of fractal dimension approaching 2.7. We found that cells in the scaffold assemble into separate groups with many elements per group. After cell wiring, we found that resulting networks exhibit high clustering, small path lengths, and small-world characteristics. These values of the topological characteristics of the network can potentially enhance the quality, quantity and density of information transported in the network compared to equivalent random graphs of the same size. This is one of the first direct observations of cells developing into 3D small-world networks in an artificial matrix.
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Affiliation(s)
- Valentina Onesto
- Center for Advanced Biomaterials for Healthcare, Italian Institute of Technology, Naples, Italy
| | - Angelo Accardo
- Laboratoire d'Analyse et d'Architecture des Systemes (LAAS), Centre National de la Recherche Scientifique, Universite de Toulouse, CNRS, Toulouse, France; Current address: Department of Precision and Microsystems Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
| | - Christophe Vieu
- Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS), Centre National de la Recherche Scientifique, Université de Toulouse, CNRS; Institut National des Sciences Appliquées - INSA, Toulouse, France
| | - Francesco Gentile
- Department of Electric Engineering and Information Technology, University Federico II, Naples, Italy
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Ding D, Wang H, Wu Z, Chen Y, Zhang Q. Highly Thermally Conductive Polyimide Composites via Constructing 3D Networks. Macromol Rapid Commun 2019; 40:e1800805. [PMID: 30673150 DOI: 10.1002/marc.201800805] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 11/01/2018] [Revised: 12/23/2018] [Indexed: 01/12/2023]
Abstract
Easy and high efficient methods are in great demand to obtain polyimide (PI) composites with high thermal conductivity in the electronic packaging field. In this work, PI/boron nitride (BN) composites with high thermal conductivity are easily fabricated. Tightly connected and well-arranged BN platelets construct effective 3D thermally conductive networks in the PI matrix upon hot pressing, after BN platelets are coated on the surface of PI granules by the help of a kind of PI adhesive. The thermal conductivity of the PI/BN composites reaches as high as 4.47 W mK-1 at a low BN loading of 20 vol%, showing an enhancement of 2099%, compared to pure PI. Such enhancement of the thermal conductivity is the highest compared with the results in the open literature. Our work is a good example that utilized the sufficient physical connection (aggregates) of thermally conductive fillers to significantly promote the thermal conductivity of polymer composites.
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Affiliation(s)
- Dongliang Ding
- Department of Applied Chemistry, School of Science, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Haitao Wang
- Department of Applied Chemistry, School of Science, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Zhiqiang Wu
- Department of Applied Chemistry, School of Science, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Yanhui Chen
- Department of Applied Chemistry, School of Science, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Qiuyu Zhang
- Department of Applied Chemistry, School of Science, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi'an, 710072, China
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Luan P, Zhang Y, Zhang X, Li Z, Prathapan R, Bach U, Zhang J. Bismuth Vanadate with Electrostatically Anchored 3D Carbon Nitride Nano-networks as Efficient Photoanodes for Water Oxidation. ChemSusChem 2018; 11:2510-2516. [PMID: 29923319 DOI: 10.1002/cssc.201801119] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Indexed: 06/08/2023]
Abstract
In this study, we report a photoanode consisting of a polymeric/inorganic nanojunction between novel nanostructured 3D C3 N4 nano-networks and BiVO4 substrate. This nanojunction is formed such that 3D C3 N4 nano-networks with a positively charged surface are efficiently anchored on the BiVO4 photoanode with a negatively charged surface. This electrostatic self-assembly can initiate and contribute to an intimate contact at the interfaces, leading to an enhanced photoelectrochemical activity and stability compared with that fabricated by non-electrostatic assembly. The C3 N4 nano-network/BiVO4 photoanode achieved a remarkable photocurrent density of 4.87 mA cm-2 for water oxidation at 1.23 V (vs. reversible hydrogen electrode) after depositing FeOOH/NiOOH as oxygen-evolution co-catalyst, which is among the highest photocurrent densities reported so far for BiVO4 -based photoanodes.
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Affiliation(s)
- Peng Luan
- School of Chemistry, Monash University, Clayton, VIC, 3800, Australia
| | - Ying Zhang
- School of Chemistry, Monash University, Clayton, VIC, 3800, Australia
| | - Xiaolong Zhang
- School of Chemistry, Monash University, Clayton, VIC, 3800, Australia
| | - Zhijun Li
- Ministry of Education Key Laboratory of Functional Inorganic Material Chemistry, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China
| | - Ragesh Prathapan
- School of Chemistry, Monash University, Clayton, VIC, 3800, Australia
| | - Udo Bach
- Department of Chemical Engineering, Monash University, Clayton, VIC, 3800, Australia
| | - Jie Zhang
- School of Chemistry, Monash University, Clayton, VIC, 3800, Australia
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Wu YJ, Wang YC, Wang RX, Zhang PF, Yang XD, Yang HJ, Li JT, Zhou Y, Zhou ZY, Sun SG. Three-Dimensional Networks of S-Doped Fe/N/C with Hierarchical Porosity for Efficient Oxygen Reduction in Polymer Electrolyte Membrane Fuel Cells. ACS Appl Mater Interfaces 2018; 10:14602-14613. [PMID: 29565123 DOI: 10.1021/acsami.7b19332] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Reasonable design and synthesis of Fe/N/C-based catalysts is one of the most promising way for developing precious metal-free oxygen reduction reaction (ORR) catalysts in acidic mediums. Herein, we developed a highly active metal-organic framework-derived S-doped Fe/N/C catalyst [S-Fe/Z8/2-aminothiazole (2-AT)] prepared by thermal treatment. The S-Fe/Z8/2-AT catalyst with uniform S-doping possesses a three-dimensional macro-meso-micro hierarchically porous structure. Moreover, the chemical composition and structural features have been well-optimized and characterized for such S-Fe/Z8/2-AT catalysts; and their formation mechanism was also revealed. Significantly, applying the optimal S-Fe/Z8/2-AT catalysts into electrocatalytic test exhibits remarkable ORR catalytic activity with a half-wave potential of 0.82 V (vs reversible hydrogen electrode) and a mass activity of 18.3 A g-1 at 0.8 V in 0.1 M H2SO4 solution; the polymer electrolyte membrane fuel cell test also confirmed their excellent catalytic activity, which gives a maximal power density as high as 800 mW cm-2 at 1 bar. A series of designed experiments disclosed that the favorable structural merits and desirable chemical compositions of S-Fe/Z8/2-AT catalysts are critical factors for efficient electrocatalytic performance. The work provides a new approach to open an avenue for accurately controlling the composition and structure of Fe/N/C catalysts with highly activity for ORR.
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Zhou Y, Zeng HC. 3D Networks of CoFePi with Hierarchical Porosity for Effective OER Electrocatalysis. Small 2018; 14:e1704403. [PMID: 29682872 DOI: 10.1002/smll.201704403] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 03/03/2018] [Indexed: 06/08/2023]
Abstract
A series of amorphous 3D Co-based phosphate networks with hierarchical porosity, including the CoPi, the binary CoM1 Pi and the trinary CoM1 M2 Pi (Mi = NiII , FeIII , CeIII ) are produced via a novel bitemplate coprecipitation approach at room temperature. Interestingly, the integration of FeIII and CoII in the same network is found to significantly influence both the porosity and the electronic state of CoII . The CoFePi with a FeIII to CoII mole ratio of 0.91 has a specific surface area of 170 m2 g-1 and average pore size of 12.3 nm, larger than those of the CoPi network; furthermore, the CoII within such CoFePi exhibits a higher oxidation state than that in the CoPi. Due to such structural and compositional merits, the binary CoFePi network shows superior oxygen evolution reaction (OER) electrocatalytic activity, which gives an overpotential as low as 0.315 V at 10 mA cm-2 and a Tafel slope of 33 mV dec-1 in 0.10 m KOH. Additionally, the trinary CoFeNiPi demonstrates similar OER catalytic performance. The two phosphate networks also exhibit remarkable catalytic stability. In view of their easy preparation, superior activity, high stability, and low cost, such transition metal phosphate networks are promising catalysts for practical OER processes.
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Affiliation(s)
- Yao Zhou
- NUS Graduate School for Integrative Sciences and Engineering and Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore
| | - Hua Chun Zeng
- NUS Graduate School for Integrative Sciences and Engineering and Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore
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Wang K, Cao X, Wang S, Zhao W, Xu J, Wang Z, Wu H. Interpenetrated and Polythreaded Co II-Organic Frameworks as a Supercapacitor Electrode Material with Ultrahigh Capacity and Excellent Energy Delivery Efficiency. ACS Appl Mater Interfaces 2018; 10:9104-9115. [PMID: 29446614 DOI: 10.1021/acsami.7b16141] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Synthesizing kinetically stable coordination polymers (CPs) through ligand functionalization can effectively improve their supercapacitive performances. Herein, we have successfully synthesized three novel and topological Co-CPs by varying the flexible N-donor ligand and inorganic anions, namely, interpenetrated [Co(HTATB)( o-bib)]·H2O, extended two-dimensional (2D) layered Co(HTATB)( m-bib)·2H2O, and three-dimensional (3D) Co(HTATB)( m-bib), where bib is the flexible N-donor bis((1 H-imidazol-1-yl)methyl)benzene linker (where o- and m- refer to ortho and meta positions, respectively) ligand and HTATB is the partial deprotonation mode from 4,4',4″- s-triazine-2,4,6-triyl-tribenzoic acid. Various Co-CPs have been directly applied in the field of supercapacitors. All these framework materials exhibit high capacitance, excellent energy delivery efficiency, and good cycling performance. For instance, the maximum specific capacitance for penetrated 3D networks is 2572 F g-1 at 2.0 A g-1, and the mean energy delivery efficiency is up to 92.7% based on the tested current densities. Compared with extensional 2D layered and 3D networks, the 3D interpenetrated and polythreaded architectures could provide more active sites and thus promote fast charging and discharging processes. Furthermore, the Li+ uptake-release abilities of the Co-based CPs are also investigated, and the initial discharge capacity value for the 3D interpenetrated structures can reach up to 1792 mA h g-1 at a current density of 50 mA g-1.
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Affiliation(s)
- Kuaibing Wang
- Jiangsu Key Laboratory of Pesticide Sciences, Department of Chemistry, College of Science , Nanjing Agricultural University , Nanjing 210095 , P. R. China
- State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute , Nanjing University , Nanjing 210093 , P. R. China
| | - Xiaoran Cao
- Jiangsu Key Laboratory of Pesticide Sciences, Department of Chemistry, College of Science , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Saier Wang
- Jiangsu Key Laboratory of Pesticide Sciences, Department of Chemistry, College of Science , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Wenjia Zhao
- Jiangsu Key Laboratory of Pesticide Sciences, Department of Chemistry, College of Science , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | - Jiangyan Xu
- Jiangsu Key Laboratory of Pesticide Sciences, Department of Chemistry, College of Science , Nanjing Agricultural University , Nanjing 210095 , P. R. China
| | | | - Hua Wu
- Jiangsu Key Laboratory of Pesticide Sciences, Department of Chemistry, College of Science , Nanjing Agricultural University , Nanjing 210095 , P. R. China
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Wang G, Yuan C, Fu B, He L, Reichmanis E, Wang H, Zhang Q, Li Y. Flow Effects on the Controlled Growth of Nanostructured Networks at Microcapillary Walls for Applications in Continuous Flow Reactions. ACS Appl Mater Interfaces 2015; 7:21580-21588. [PMID: 26352859 DOI: 10.1021/acsami.5b06851] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Low-cost microfluidic devices are desirable for many chemical processes; however, access to robust, inert, and appropriately structured materials for the inner channel wall is severely limited. Here, the shear force within confined microchannels was tuned through control of reactant solution fluid-flow and shown to dramatically impact nano- through microstructure growth. Combined use of experimental results and simulations allowed controlled growth of 3D networked Zn(OH)F nanostructures with uniform pore distributions and large fluid contact areas on inner microchannel walls. These attributes facilitated subsequent preparation of uniformly distributed Pd and PdPt networks with high structural and chemical stability using a facile, in situ conversion method. The advantageous properties of the microchannel based catalytic system were demonstrated using microwave-assisted continuous-flow coupling as a representative reaction. High conversion rates and good recyclability were obtained. Controlling materials nanostructure via fluid-flow-enhanced growth affords a general strategy to optimize the structure of an inner microchannel wall for desired attributes. The approach provides a promising pathway toward versatile, high-performance, and low-cost microfluidic devices for continuous-flow chemical processes.
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Affiliation(s)
- Gang Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, and ‡Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University , Shanghai 201620, People's Republic of China
- School of Chemical and Biomolecular Engineering, ∥School of Chemistry and Biochemistry, and ⊥School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Cansheng Yuan
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, and ‡Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University , Shanghai 201620, People's Republic of China
- School of Chemical and Biomolecular Engineering, ∥School of Chemistry and Biochemistry, and ⊥School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Boyi Fu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, and ‡Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University , Shanghai 201620, People's Republic of China
- School of Chemical and Biomolecular Engineering, ∥School of Chemistry and Biochemistry, and ⊥School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Luye He
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, and ‡Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University , Shanghai 201620, People's Republic of China
- School of Chemical and Biomolecular Engineering, ∥School of Chemistry and Biochemistry, and ⊥School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Elsa Reichmanis
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, and ‡Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University , Shanghai 201620, People's Republic of China
- School of Chemical and Biomolecular Engineering, ∥School of Chemistry and Biochemistry, and ⊥School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Hongzhi Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, and ‡Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University , Shanghai 201620, People's Republic of China
- School of Chemical and Biomolecular Engineering, ∥School of Chemistry and Biochemistry, and ⊥School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Qinghong Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, and ‡Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University , Shanghai 201620, People's Republic of China
- School of Chemical and Biomolecular Engineering, ∥School of Chemistry and Biochemistry, and ⊥School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Yaogang Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, and ‡Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University , Shanghai 201620, People's Republic of China
- School of Chemical and Biomolecular Engineering, ∥School of Chemistry and Biochemistry, and ⊥School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
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