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Lu P, Li X, Xu J, Fan Y, Sun J, Liang Y, Tian L, Ming W, Ren L, Zhao J. Bio-Inspired Interlocking Structures for Enhancing Flexible Coatings Adhesion. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2312037. [PMID: 38409635 DOI: 10.1002/smll.202312037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Revised: 02/01/2024] [Indexed: 02/28/2024]
Abstract
The flexible protective coatings and substrates frequently exhibit unstable bonding in industrial applications. For strong interfacial adhesion of heterogeneous materials and long-lasting adhesion of flexible protective coatings even in harsh corrosive environments. Inspired by the interdigitated structures in Phloeodes diabolicus elytra, a straightforward magnetic molding technique is employed to create an interlocking microarray for reinforced heterogeneous assembly. Benefiting from this bio-inspired microarrays, the interlocking polydimethylsiloxane (PDMS) coating recorded a 270% improvement in tensile adhesion and a 520% increase in shear resistance, approaching the tensile limitation of PDMS. The elastic polyurethane-polyamide (PUPI) coating equipped with interlocking structures demonstrated a robust adhesion strength exceeding 10.8 MPa and is nearly unaffected by the corrosion immersion. In sharp contrast, its unmodified counterpart exhibited low initial adhesion and maintain ≈20% of its adhesion strength after 30 d of immersion. PUPI coating integrated with microarrays exhibits superior resistance to corrosion (30 d, |Z|0.01HZ ≈1010 Ω cm2, Rct≈108 Ω cm2), cavitation and long-term adhesion retention. These interlocking designs can also be adapted to curved surfaces by 3D printing and enhances heterogeneous assembly of non-bonded materials like polyvinylidene fluoride (PTFE) and PDMS. This bio-inspired interlocking structures offers a solution for durably bonding incompatible interfaces across varied engineering applications.
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Affiliation(s)
- Pengpeng Lu
- Key Laboratory of Bio-inspired Engineering, Ministry of Education, Jilin University, Changchun, 130022, China
| | - Xin Li
- College of Chemistry, Jilin University, Changchun, 130022, China
| | - Jingyang Xu
- Key Laboratory of Bio-inspired Engineering, Ministry of Education, Jilin University, Changchun, 130022, China
| | - Yong Fan
- College of Chemistry, Jilin University, Changchun, 130022, China
| | - Jiyu Sun
- Key Laboratory of Bio-inspired Engineering, Ministry of Education, Jilin University, Changchun, 130022, China
| | - Yunhong Liang
- Key Laboratory of Bio-inspired Engineering, Ministry of Education, Jilin University, Changchun, 130022, China
| | - Limei Tian
- Key Laboratory of Bio-inspired Engineering, Ministry of Education, Jilin University, Changchun, 130022, China
| | - Weihua Ming
- Department of Chemistry and Biochemistry, Georgia Southern University, P.O. Box 8064, Statesboro, GA, 30460, USA
| | - Luquan Ren
- Key Laboratory of Bio-inspired Engineering, Ministry of Education, Jilin University, Changchun, 130022, China
| | - Jie Zhao
- Key Laboratory of Bio-inspired Engineering, Ministry of Education, Jilin University, Changchun, 130022, China
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2
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Xu Q, Tao Y, Wang Z, Zeng H, Yang J, Li Y, Zhao S, Tang P, Zhang J, Yan M, Wang Q, Zhou K, Zhang D, Xie H, Zhang Y, Bowen C. Highly Flexible, High-Performance, and Stretchable Piezoelectric Sensor Based on a Hierarchical Droplet-Shaped Ceramics with Enhanced Damage Tolerance. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2311624. [PMID: 38281059 DOI: 10.1002/adma.202311624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 01/07/2024] [Indexed: 01/29/2024]
Abstract
Stretchable self-powered sensors are of significant interest in next-generation wearable electronics. However, current strategies for creating stretchable piezoelectric sensors based on piezoelectric polymers or 0-3 piezoelectric composites face several challenges such as low piezoelectric activity, low sensitivity, and poor durability. In this paper, a biomimetic soft-rigid hybrid strategy is used to construct a new form of highly flexible, high-performance, and stretchable piezoelectric sensor. Inspired by the hinged bivalve Cristaria plicata, hierarchical droplet-shaped ceramics are manufactured and used as rigid components, where computational models indicate that the unique arched curved surface and rounded corners of this bionic structure can alleviate stress concentrations. To ensure electrical connectivity of the piezoelectric phase during stretching, a patterned liquid metal acts as a soft circuit and a silicone polymer with optimized wettability and stretchability serves as a soft component that forms a strong mechanical interlock with the hierarchical ceramics. The novel sensor design exhibits excellent sensitivity and durability, where the open circuit voltage remains stable after 5000 stretching cycles at 60% strain and 5000 twisting cycles at 180°. To demonstrate its potential in heathcare applications, this new stretchable sensor is successfully used for wireless gesture recognition and assessing the progression of knee osteoarthritis.
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Affiliation(s)
- Qianqian Xu
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Yong Tao
- School of Civil Engineering, Central South University, Changsha, Hunan, 410083, China
| | - Zhenxing Wang
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Hanmin Zeng
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Junxiao Yang
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Yuan Li
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Senfeng Zhao
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China
| | - Peiyuan Tang
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Jianxun Zhang
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Mingyang Yan
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Qingping Wang
- Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, UK
| | - Kechao Zhou
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Dou Zhang
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Hui Xie
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Yan Zhang
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
| | - Chris Bowen
- Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, UK
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3
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Krishna SBN, Jakmunee J, Mishra YK, Prakash J. ZnO based 0-3D diverse nano-architectures, films and coatings for biomedical applications. J Mater Chem B 2024; 12:2950-2984. [PMID: 38426529 DOI: 10.1039/d4tb00184b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
Thin-film nano-architecting is a promising approach that controls the properties of nanoscale surfaces to increase their interdisciplinary applications in a variety of fields. In this context, zinc oxide (ZnO)-based various nano-architectures (0-3D) such as quantum dots, nanorods/nanotubes, nanothin films, tetrapods, nanoflowers, hollow structures, etc. have been extensively researched by the scientific community in the past decade. Owing to its unique surface charge transport properties, optoelectronic properties and reported biomedical applications, ZnO has been considered as one of the most important futuristic bio-nanomaterials. This review is focused on the design/synthesis and engineering of 0-3D nano-architecture ZnO-based thin films and coatings with tunable characteristics for multifunctional biomedical applications. Although ZnO has been extensively researched, ZnO thin films composed of 0-3D nanoarchitectures with promising thin film device bio-nanotechnology applications have rarely been reviewed. The current review focuses on important details about the technologies used to make ZnO-based thin films, as well as the customization of properties related to bioactivities, characterization, and device fabrication for modern biomedical uses that are relevant. It features biosensing, tissue engineering/wound healing, antibacterial, antiviral, and anticancer activity, as well as biomedical diagnosis and therapy with an emphasis on a better understanding of the mechanisms of action. Eventually, key issues, experimental parameters and factors, open challenges, etc. in thin film device fabrications and applications, and future prospects will be discussed, followed by a summary and conclusion.
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Affiliation(s)
- Suresh Babu Naidu Krishna
- Institute for Water and Wastewater Technology, Durban University of Technology, Durban-4000, South Africa
- Department of Biomedical and Clinical Technology, Durban University of Technology, Durban-4000, South Africa
| | - Jaroon Jakmunee
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Yogendra Kumar Mishra
- Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, 6400, Sønderborg, Denmark
| | - Jai Prakash
- Department of Chemistry, National Institute of Technology Hamirpur, Hamirpur 177005, (H.P.), India.
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4
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Didier CM, Fox D, Pollard KJ, Baksh A, Iyer NR, Bosak A, Li Sip YY, Orrico JF, Kundu A, Ashton RS, Zhai L, Moore MJ, Rajaraman S. Fully Integrated 3D Microelectrode Arrays with Polydopamine-Mediated Silicon Dioxide Insulation for Electrophysiological Interrogation of a Novel 3D Human, Neural Microphysiological Construct. ACS APPLIED MATERIALS & INTERFACES 2023; 15:37157-37173. [PMID: 37494582 DOI: 10.1021/acsami.3c05788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
Advances within in vitro biological system complexity have enabled new possibilities for the "Organs-on-a-Chip" field. Microphysiological systems (MPS) as such incorporate sophisticated biological constructs with custom biological sensors. For microelectromechanical systems (MEMS) sensors, the dielectric layer is critical for device performance, where silicon dioxide (SiO2) represents an excellent candidate due to its biocompatibility and wide utility in MEMS devices. Yet, high temperatures traditionally preclude SiO2 from incorporation in polymer-based BioMEMS. Electron-beam deposition of SiO2 may provide a low-temperature, dielectric serving as a nanoporous MPS growth substrate. Herein, we enable improved adherence of nanoporous SiO2 to polycarbonate (PC) and 316L stainless steel (SS) via polydopamine (PDA)-mediated chemistry. The resulting stability of the combinatorial PDA-SiO2 film was interrogated, along with the nature of the intrafilm interactions. A custom polymer-metal three-dimensional (3D) microelectrode array (3D MEA) is then reported utilizing PDA-SiO2 insulation, for definition of novel dorsal root ganglion (DRG)/nociceptor and dorsal horn (DH) 3D neural constructs in excess of 6 months for the first time. Spontaneous/evoked compound action potentials (CAPs) are successfully reported. Finally, inhibitory drugs treatments showcase pharmacological responsiveness of the reported multipart biological activity. These results represent the initiation of a novel 3D MEA-integrated, 3D neural MPS for the long-term electrophysiological study.
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Affiliation(s)
- Charles M Didier
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - David Fox
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Kevin J Pollard
- Tulane University, 6823 St Charles Ave, New Orleans, Louisiana 70118, United States
| | - Aliyah Baksh
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Nisha R Iyer
- University of Wisconsin-Madison, 330 N. Orchard Street, Madison, Wisconsin 53717, United States
| | - Alexander Bosak
- Tulane University, 6823 St Charles Ave, New Orleans, Louisiana 70118, United States
| | - Yuen Yee Li Sip
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Julia F Orrico
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Avra Kundu
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Randolph S Ashton
- University of Wisconsin-Madison, 330 N. Orchard Street, Madison, Wisconsin 53717, United States
| | - Lei Zhai
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
| | - Michael J Moore
- Tulane University, 6823 St Charles Ave, New Orleans, Louisiana 70118, United States
- AxoSim Inc., 1441 Canal St., New Orleans, Louisiana 70112, United States
| | - Swaminathan Rajaraman
- University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816, United States
- Primordia Biosystems Inc., 1317 Edgewater Drive, #2701, Orlando, Florida 32804, United States
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5
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Liao M, Zhu Y, Gong G, Qiao L. Thin-Film Composite Membranes with a Carbon Nanotube Interlayer for Organic Solvent Nanofiltration. MEMBRANES 2022; 12:817. [PMID: 36005732 PMCID: PMC9414755 DOI: 10.3390/membranes12080817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
Compared to the traditional chemical-crosslinking-based polymer, the porous polytetrafluoroethylene (PTFE) substrate is considered to be an excellent support for the fabrication of thin-film composite (TFC) organic solvent nanofiltration (OSN) membranes. However, the low surface energy and chemical inertness of PTFE membranes presented major challenges for fabricating a polyamide active layer on its surface via interfacial polymerization (IP). In this study, a triple-layered TFC OSN membrane was fabricated via IP, which consisted of a PA top layer on a carbon nanotube (CNT) interlayer covering the macroporous PTFE substrate. The defect-free formation and cross-linking degree of the PA layer can be improved by controlling the CNT deposition amount to achieve a good OSN performance. This new TFC OSN membrane exhibited a high dye rejection (the rejection of Bright blue B > 97%) and a moderate and stable methanol permeated flux of approximately 8.0 L m−2 h−1 bar−1. Moreover, this TFC OSN membrane also exhibited an excellent solvent resistance to various organic solvents and long-term stability during a continuous OSN process.
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Affiliation(s)
- Mingjia Liao
- Chemical Engineering Department, Chongqing Chemical Industry Vocational College, Chongqing 401228, China
| | - Yun Zhu
- Institute of Resources and Security, Chongqing Vocational Institute of Engineering, Chongqing 401228, China
| | - Genghao Gong
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Lei Qiao
- Chongqing Academy of Eco-environmental Sciences, Chongqing 401147, China
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6
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Huang S, Wan Y, Ming X, Zhou J, Zhou M, Chen H, Zhang Q, Zhu S. Adhering Low Surface Energy Materials without Surface Pretreatment via Ion-Dipole Interactions. ACS APPLIED MATERIALS & INTERFACES 2021; 13:41112-41119. [PMID: 34406738 DOI: 10.1021/acsami.1c11822] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Low surface energy materials resist adhesion due to their chemical inertness and non-wetting properties. Herein, we report the creation of a transparent ionogel adhesive that uses ion-dipole interactions to achieve a higher bonding performance to polytetrafluoroethylene (PTFE) relative to most commercial glues. The ionogel adhesive is composed of a poly(hexafluorobutyl acrylate-co-methyl methacrylate) random copolymer and a hydrophobic ionic liquid. The prepared ionogel can adhere to various hydrophobic substrates, such as PTFE, polypropylene, and polyethylene, as well as hydrophilic glass, ceramics, and steel. The design strategy and adhesion behavior are well interpreted using the density functional theory calculations and molecular dynamics simulations. The straightforward ultraviolet-curing method, high optical clarity, versatile adhesion ability, and reversible adhesion capabilities make this high-performance adhesive a promising product for commercialization.
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Affiliation(s)
- Shuaishuai Huang
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China
- University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Yichen Wan
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China
| | - Xiaoqing Ming
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China
| | - Jiaming Zhou
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China
| | - Miaomiao Zhou
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China
| | - Hong Chen
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China
| | - Qi Zhang
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China
| | - Shiping Zhu
- School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, P. R. China
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7
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Yang C, Wu Y, Nie M, Wang Q, Liu Y. Highly Stretchable and Conductive Carbon Fiber/Polyurethane Conductive Films Featuring Interlocking Interfaces. ACS APPLIED MATERIALS & INTERFACES 2021; 13:38656-38665. [PMID: 34346227 DOI: 10.1021/acsami.1c08266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Stretchable conductors are essential assembly units of next-generation flexible electronics, requiring excellent conductivity and stretchability simultaneously. However, poor interfacial adhesion between conductive fillers and polymer matrixes often triggers the relative slippage and dislocation of the conductive network, deteriorating the final conductivity. Herein, we constructed interlocking interfaces in a polyurethane (PU) conductive composite by introducing brush-like carbon fibers (CFs) with laterally grown zinc oxide nanowires (ZnO NWs). The ZnO NW-enabled construction of the functional interfaces integrated the CFs tightly with the polymer matrix to greatly improve the interfacial adhesion and suppress the sliding displacement of conductive fillers upon external load, contributing to excellent mechanical strength and conductive stability. Specifically, the combination of high mechanical strength (7.19 MPa) and stable conductivity (26.3 S/m under 100% strain, approaching 30 S/m of the initial conductivity) was demonstrated for the brush-like CF/PU film. Finally, the application potential of the novel stretchable conductor as a thermal therapy unit and connecting wire in a flexible circuit was explored successfully under complex dynamic deformations. Accordingly, this inspiring result creatively combines the interface geometry with conductive stability, and offers a facile and effective route to prepare excellent stretchable conductors, which can be easily applied to other conductive composites.
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Affiliation(s)
- Changhua Yang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Yanan Wu
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Min Nie
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Qi Wang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Yuansen Liu
- Technology Innovation Center for Exploitation of Marine Biological Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
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8
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Siebert L, Luna-Cerón E, García-Rivera LE, Oh J, Jang J, Rosas-Gómez DA, Pérez-Gómez MD, Maschkowitz G, Fickenscher H, Oceguera-Cuevas D, Holguín-León CG, Byambaa B, Hussain MA, Enciso-Martinez E, Cho M, Lee Y, Sobahi N, Hasan A, Orgill DP, Mishra YK, Adelung R, Lee E, Shin SR. Light-controlled growth factors release on tetrapodal ZnO-incorporated 3D-printed hydrogels for developing smart wound scaffold. ADVANCED FUNCTIONAL MATERIALS 2021; 31:2007555. [PMID: 36213489 PMCID: PMC9536771 DOI: 10.1002/adfm.202007555] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Indexed: 05/27/2023]
Abstract
Advanced wound scaffolds that integrate active substances to treat chronic wounds have gained significant recent attention. While wound scaffolds and advanced functionalities have previously been incorporated into one medical device, the wirelessly triggered release of active substances has remained the focus of many research endeavors. To combine multiple functions including light-triggered activation, anti-septic, angiogenic, and moisturizing properties, we have developed a 3D printed hydrogel patch encapsulating vascular endothelial growth factor (VEGF) decorated with photoactive and antibacterial tetrapodal zinc oxide (t-ZnO) microparticles. To achieve the smart release of VEGF, t-ZnO was modified by chemical treatment and activated through UV/visible light exposure. This process would also make the surface rough and improve protein adhesion. The elastic modulus and degradation behavior of the composite hydrogels, which must match the wound healing process, were adjusted by changing t-ZnO concentrations. The t-ZnO-laden composite hydrogels can be printed with any desired micropattern to potentially create a modular elution of various growth factors. The VEGF decorated t-ZnO-laden hydrogel patches showed low cytotoxicity and improved angiogenic properties while maintaining antibacterial functions in vitro. In vivo tests showed promising results for the printed wound patches, with less immunogenicity and enhanced wound healing.
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Affiliation(s)
- Leonard Siebert
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
- Functional Nanomaterials, Institute for Materials Science, Faculty of Engineering, Kiel University, Kaiserstr. 2, D-24143, Kiel, Germany
| | - Eder Luna-Cerón
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
| | - Luis Enrique García-Rivera
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
| | - Junsung Oh
- Department of Nano-biomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 31116, Republic of Korea
| | - JunHwee Jang
- Department of Nano-biomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 31116, Republic of Korea
| | - Diego A Rosas-Gómez
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
| | - Mitzi D Pérez-Gómez
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
| | - Gregor Maschkowitz
- Institute for Infection Medicine, Kiel University and University Medical Center Schleswig-Holstein, Brunswiker Str. 4, D-24105 Kiel, Germany
| | - Helmut Fickenscher
- Institute for Infection Medicine, Kiel University and University Medical Center Schleswig-Holstein, Brunswiker Str. 4, D-24105 Kiel, Germany
| | - Daniela Oceguera-Cuevas
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
| | - Carmen G Holguín-León
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
| | | | - Mohammad A Hussain
- Department of Electrical and Computer Engineering, King Abdulaziz University, Jeddah 21569, Saudi Arabia
| | - Eduardo Enciso-Martinez
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
| | | | - Yuhan Lee
- Department of Anesthesiology, preoperative and pain medicine, Center for Nanomedicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Nebras Sobahi
- Department of Electrical and Computer Engineering, King Abdulaziz University, Jeddah 21569, Saudi Arabia
| | - Anwarul Hasan
- Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha, Qatar
- Biomedical Research Centre (BRC), Qatar University, Doha, Qatar
| | - Dennis P Orgill
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Yogendra K Mishra
- Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, 6400, Sønderborg, Denmark
- Functional Nanomaterials, Institute for Materials Science, Faculty of Engineering, Kiel University, Kaiserstr. 2, D-24143, Kiel, Germany
| | - Rainer Adelung
- Functional Nanomaterials, Institute for Materials Science, Faculty of Engineering, Kiel University, Kaiserstr. 2, D-24143, Kiel, Germany
| | - Eunjung Lee
- Department of Nano-biomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan 31116, Republic of Korea
| | - Su Ryon Shin
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA
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9
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Hsieh GW, Ling SR, Hung FT, Kao PH, Liu JB. Enhanced piezocapacitive response in zinc oxide tetrapod-poly(dimethylsiloxane) composite dielectric layer for flexible and ultrasensitive pressure sensor. NANOSCALE 2021; 13:6076-6086. [PMID: 33687415 DOI: 10.1039/d0nr06743a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We demonstrate polymeric piezocapacitive pressure sensors based on a novel composite dielectric film of poly(dimethylsiloxane) elastomeric silicone and zinc oxide tetrapod. With an appropriate loading of zinc oxide tetrapods, composite piezocapacitive pressure sensors show a 75-fold enhancement of pressure sensitivity over pristine devices, achieving a marked value as high as 2.55 kPa-1. The limit of detection was estimated to be about 10 mg, corresponding to a subtle stimulus of only 1.0 Pa. Besides, versatile functionalities such as detection of finger bending/straightening, calligraphy writing, and air flow blowing have been investigated. It is expected that the proposed piezocapacitive pressure sensors incorporating stress-sensitive additives of zinc oxide nanostructures may provide a promising means for potential applications in ultrasensitive wearable, healthcare systems and human-machine interfaces.
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Affiliation(s)
- Gen-Wen Hsieh
- Institute of Lighting and Energy Photonics, College of Photonics, National Chiao Tung University, 301, Gaofa 3rd Road, Guiren District, Tainan 71150, Taiwan, Republic of China.
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10
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Kizilkan E, Strueben J, Staubitz A, Gorb SN. Bioinspired photocontrollable microstructured transport device. Sci Robot 2021; 2:2/2/eaak9454. [PMID: 33157866 DOI: 10.1126/scirobotics.aak9454] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Accepted: 12/15/2016] [Indexed: 11/02/2022]
Abstract
Geckos, which can walk upside down on vertical and underneath horizontal surfaces, owe this ability to the hierarchical structures under their toes. These structures are responsible for substantial adhesion and, at the same time, for quick detachment by mechanical stimulus through leg movements. Inspired by such stimuli-responsive systems in nature, we developed an artificial, photocontrollable microstructured transport device. Through tunable ultraviolet light illumination, the adhesive ability of this bioinspired transport device is reduced up to a factor of 2.7 in terms of adhesive forces and is quickly recovered when the light stimulus ceases. This bioinspired photocontrollable device has been used in a pick-up and drop-down system for transporting planar and three-dimensional solid objects.
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Affiliation(s)
- Emre Kizilkan
- Department of Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 1-9, 24118 Kiel, Germany.
| | - Jan Strueben
- Otto Diels Institute for Organic Chemistry, Kiel University, Otto-Hahn-Platz 4, 24118 Kiel, Germany.,Institute for Organic and Analytical Chemistry, University of Bremen, Leobener Straße NW 2 C, 28359 Bremen, Germany.,MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstraße 1, 28359 Bremen, Germany
| | - Anne Staubitz
- Otto Diels Institute for Organic Chemistry, Kiel University, Otto-Hahn-Platz 4, 24118 Kiel, Germany. .,Institute for Organic and Analytical Chemistry, University of Bremen, Leobener Straße NW 2 C, 28359 Bremen, Germany.,MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstraße 1, 28359 Bremen, Germany
| | - Stanislav N Gorb
- Department of Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 1-9, 24118 Kiel, Germany.
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11
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Sivakumar R, Lee NY. Chemically robust succinimide-group-assisted irreversible bonding of poly(dimethylsiloxane)-thermoplastic microfluidic devices at room temperature. Analyst 2020; 145:6887-6894. [PMID: 32820755 DOI: 10.1039/d0an01268h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This study investigates surface chemical modification using anhydride silane and amino silane reagents at room temperature (RT) to realize bonding between silicon-based PDMS and non-silicon thermoplastics. The anhydride silane shows vigorous activity against water, forming a terminal dicarboxylic acid in the plasma-activated elastomeric poly(dimethylsiloxane) (PDMS) surface, and it can readily react with amino-silane-modified thermoplastic surfaces, resulting in a permanent bond via the formation of a stable succinimide group without the requirement for high temperature or additional pressure to initiate the bonding. The modified surfaces of PDMS and thermoplastics were successfully characterized by water contact angle measurement, fluorescence measurement, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The bond strength values of PDMS-thermoplastic assemblies, measured by the tensile test for PDMS-polystyrene (PS), PDMS-poly(methyl methacrylate) (PMMA), PDMS-polycarbonate (PC), and PDMS-poly(ethyl terephthalate) (PET) assemblies, were found to be approximately 519.5 ± 6, 259 ± 15, 476.6 ± 8, and 458.2 ± 27 kPa, respectively. Moreover, the bond strength was further examined by performing a burst test for PDMS-PMMA, PDMS-PS, PDMS-PC, and PDMS-PET microfluidic devices, which were found to have the maximum pressure values at approximately 344.73, 448.15, 413.68, and 379.21 kPa, respectively. Based on these results, the hybrid microfluidic devices can be used for high-pressure experiments such as blood plasma separation and continuous-flow polymerase chain reaction (CF-PCR). We have also performed the large area bonding of the PDMS-PC assembly (10 × 10 cm2), ensuring the high robustness and reliability of the proposed surface chemical bonding method.
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Affiliation(s)
- Rajamanickam Sivakumar
- Department of Industrial Environmental Engineering, College of Industrial Environmental Engineering, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea
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12
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13
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Ryu WM, Kim SN, Min CH, Choy YB. Dry Tablet Formulation of PLGA Nanoparticles with a Preocular Applicator for Topical Drug Delivery to the Eye. Pharmaceutics 2019; 11:pharmaceutics11120651. [PMID: 31817173 PMCID: PMC6955998 DOI: 10.3390/pharmaceutics11120651] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/28/2019] [Accepted: 12/02/2019] [Indexed: 12/30/2022] Open
Abstract
To enhance ocular drug bioavailability, a rapidly dissolving dry tablet containing alginate and drug-loaded poly(lactic-co-glycolic acid) (PLGA) nanoparticles was proposed. For hygienic and easy administration of an accurate drug-dose with this tablet, the use of a preocular applicator was suggested. Herein, a dry tablet was prepared by embedding dexamethasone-loaded PLGA nanoparticles in alginate, which was deposited on the tip of the applicator. The nanoparticles were loaded with 85.45 μg/mg drug and exhibited sustained drug release for 10 h. To evaluate in vivo efficacy, dexamethasone concentration in the aqueous humor was measured after topical administration of the dry tablet, with the applicator, to rabbit eyes and was compared to that achieved with Maxidex®, a commercially-available dexamethasone eye drops. When applied with the preocular applicator, the dry tablet containing alginate could be fully detached and delivered to the eye surface. In fact, it showed up to 2 h of nanoparticle retention on the preocular surface due to tear viscosity enhancement, causing an estimated 2.6-fold increase in ocular drug bioavailability compared to Maxidex®. Therefore, the preocular applicator combined with a dry alginate tablet containing PLGA nanoparticles can be a promising system for aseptically delivering an accurate dose of ophthalmic drug with enhanced bioavailability.
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Affiliation(s)
- Woo Mi Ryu
- Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, Seoul 08826, Korea; (W.M.R.); (C.H.M.)
| | - Se-Na Kim
- Institute of Medical & Biological Engineering, Medical Research Center, Seoul National University, Seoul 03080, Korea;
| | - Chang Hee Min
- Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, Seoul 08826, Korea; (W.M.R.); (C.H.M.)
| | - Young Bin Choy
- Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, Seoul 08826, Korea; (W.M.R.); (C.H.M.)
- Institute of Medical & Biological Engineering, Medical Research Center, Seoul National University, Seoul 03080, Korea;
- Department of Biomedical Engineering, Seoul National University College of Medicine, Seoul 03080, Korea
- Correspondence: ; Tel.: +82-2-740-8592
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14
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Long S, Cao X, Huang R, Xu F, Li N, Huang A, Sun G, Bao S, Luo H, Jin P. Self-Template Synthesis of Nanoporous VO 2-Based Films: Localized Surface Plasmon Resonance and Enhanced Optical Performance for Solar Glazing Application. ACS APPLIED MATERIALS & INTERFACES 2019; 11:22692-22702. [PMID: 31199111 DOI: 10.1021/acsami.9b03586] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Poly(tetrafluoroethylene) (Teflon) has been selected as the self-template structural material in the preparation of VO2 films using a reactive magnetron sputtering method and post-annealing process. VO2 films with spontaneous random nanoporous structures growing on quartz glasses have been deliberately established via bottom-up processing through this novel and facile approach. The nanoporous VO2 films exhibit an excellent optical performance based on the localized surface plasmon resonance, with ultrahigh luminous transmittance ( Tlum-L) up to 78.0% and the promoted solar modulation ability (Δ Tsol) of 14.1%. Meanwhile, the ingenious microstructure of the film provides an antireflection function from multiple perspectives on visible light and indicates the potential of the windshield on vehicles for smart solar modulation. The nanoporous films expand the practical application of thermochromic VO2 to a fire-new field, breaking the optical performance envelope of the single-layer dense VO2 film away, and offering a universal method to prepare homogeneous nanoporous structures for thin films.
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Affiliation(s)
- Shiwei Long
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | | | - Rong Huang
- Key Laboratory of Polar Materials and Devices, Ministry of Education , East China Normal University , Shanghai 200241 , China
| | - Fang Xu
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Ning Li
- Department of Materials Science and Engineering , College of Science, China University of Petroleum Beijing , No. 18 Fuxue Road , Beijing 102249 , China
| | | | | | | | - Hongjie Luo
- School of Materials Science and Engineering , Shanghai University , Shangda Road 99 , Baoshan, Shanghai 200444 , China
| | - Ping Jin
- Materials Research Institute for Sustainable Development , National Institute of Advanced Industrial Science and Technology , Nagoya 463-8560 , Japan
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15
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Ohkubo Y, Endo K, Yamamura K. Adhesive-free adhesion between heat-assisted plasma-treated fluoropolymers (PTFE, PFA) and plasma-jet-treated polydimethylsiloxane (PDMS) and its application. Sci Rep 2018; 8:18058. [PMID: 30584251 PMCID: PMC6305381 DOI: 10.1038/s41598-018-36469-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 11/12/2018] [Indexed: 11/23/2022] Open
Abstract
Conventional low-temperature plasma treatment was reported to minimally improve the adhesion property of polytetrafluoroethylene (PTFE), whereas heat-assisted plasma (HAP) treatment significantly improved the same. An unvulcanized rubber was previously used as an adherent for PTFE. This study aimed to achieve strong adhesive-free adhesion between PTFE and vulcanized polydimethylsiloxane (PDMS) rubber. As-received vulcanized PDMS rubber did not adhere to HAP-treated PTFE, and as-received PTFE did not adhere to vulcanized rubber of plasma-jet (PJ) treated PDMS rubber; however, HAP-treated PTFE strongly adhered to vulcanized PJ-treated PDMS rubber, and both PTFE and PDMS exhibited cohesion failure in the T-peel test. The surface chemical compositions of the PTFE and PDMS sides were determined using X-ray photoelectron spectroscopy. The strong PTFE/PDMS adhesion was explained via hydrogen and covalent bond formation (C–O–Si and/or C(=O)–O–Si) between hydroxyl (C–OH) or carboxyl (C(=O)–OH) groups of the HAP-treated PTFE. This process was also applied to adhesive-free adhesion between a tetrafluoroethylene–perfluoroalkylvinylether copolymer (PFA) and PDMS; subsequently, a translucent PFA/PDMS assembly with strong adhesion was realized together with the PTFE/PDMS assembly. Strong adhesive-free adhesion between fluoropolymers (PTFE, PFA) and vulcanized PDMS rubber without using any adhesives and graft polymer was successfully realized upon plasma treatment of both the fluoropolymer and PDMS sides. Additionally, a PDMS sheet, which was PJ-treated on both sides, was applied to strongly adhere fluoropolymers (PTFE, PFA) to materials such as metal and glass. PJ-treated PDMS was used as an intermediate layer rather than a strong adhesive, achieving PTFE/PDMS/metal and PTFE/PDMS/glass assemblies. The PTFE/PDMS, PDMS/metal, and PDMS/glass adhesion strengths exceeded 2 N/mm.
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Affiliation(s)
- Yuji Ohkubo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Katsuyoshi Endo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kazuya Yamamura
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
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16
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An S, Kim HJ, Chi S, Lee J. Enhanced Adhesion of Polydimethylsiloxane Using an Interlocked Finger Structure. Macromol Rapid Commun 2018; 39:e1800106. [DOI: 10.1002/marc.201800106] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Revised: 06/02/2018] [Indexed: 01/12/2023]
Affiliation(s)
- Suyeong An
- Department of Chemical Engineering and Materials Science; Chung-Ang University; 221, Heukseok-dong Dongjak-gu Seoul 156-756 Republic of Korea
| | - Hyun Jin Kim
- Department of Chemical Engineering and Materials Science; Chung-Ang University; 221, Heukseok-dong Dongjak-gu Seoul 156-756 Republic of Korea
| | - Sangwon Chi
- Department of Chemical Engineering and Materials Science; Chung-Ang University; 221, Heukseok-dong Dongjak-gu Seoul 156-756 Republic of Korea
| | - Jonghwi Lee
- Department of Chemical Engineering and Materials Science; Chung-Ang University; 221, Heukseok-dong Dongjak-gu Seoul 156-756 Republic of Korea
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17
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Tramsen HT, Gorb SN, Zhang H, Manoonpong P, Dai Z, Heepe L. Inversion of friction anisotropy in a bio-inspired asymmetrically structured surface. J R Soc Interface 2018; 15:20170629. [PMID: 29298956 PMCID: PMC5805965 DOI: 10.1098/rsif.2017.0629] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 12/01/2017] [Indexed: 11/12/2022] Open
Abstract
Friction anisotropy is an important property of many surfaces that usually facilitate the generation of motion in a preferred direction. Such surfaces are very common in biological systems and have been the templates for various bio-inspired materials with similar tribological properties. So far friction anisotropy is considered to be the result of an asymmetric arrangement of surface nano- and microstructures. However, here we show by using bio-inspired sawtooth-structured surfaces that the anisotropic friction properties are not only controlled by an asymmetric surface topography, but also by the ratio of the sample-substrate stiffness, the aspect ratio of surface structures, and by the substrate roughness. Systematically modifying these parameters, we were able to demonstrate a broad range of friction anisotropies, and for specific sample-substrate combinations even an inversion of the anisotropy. This result highlights the complex interrelation between the different material and topographical parameters on friction properties and sheds new light on the conventional design paradigm of tribological systems. Finally, this result is also of great importance for understanding functional principles of biological materials and surfaces, as such inversion of friction anisotropy may correlate with gait pattern and walking behaviour in climbing animals, which in turn may be used in robotic applications.
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Affiliation(s)
- Halvor T Tramsen
- Department of Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Kiel, Germany
| | - Stanislav N Gorb
- Department of Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Kiel, Germany
| | - Hao Zhang
- College of Mechanical and Electric Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Poramate Manoonpong
- Embodied AI and Neurorobotics Lab, Centre for BioRobotics, The Mærsk Mc-Kinney Møller Institute, University of Southern Denmark, Odense, Denmark
- Bio-inspired Robotics and Neural Engineering Lab, School of Information Science & Technology, Vidyasirimedhi Institute of Science & Technology, Rayong, Thailand
| | - Zhendong Dai
- College of Mechanical and Electric Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Lars Heepe
- Department of Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Kiel, Germany
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18
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Shi S, Huang P, Nie M, Wang Q. Polypropylene/polyamide blend featuring mechanical interlocking via controlled interfacial diffusion and recrystallization. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.10.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Nasajpour A, Mandla S, Shree S, Mostafavi E, Sharifi R, Khalilpour A, Saghazadeh S, Hassan S, Mitchell MJ, Leijten J, Hou X, Moshaverinia A, Annabi N, Adelung R, Mishra YK, Shin SR, Tamayol A, Khademhosseini A. Nanostructured Fibrous Membranes with Rose Spike-Like Architecture. NANO LETTERS 2017; 17:6235-6240. [PMID: 28819978 PMCID: PMC5683165 DOI: 10.1021/acs.nanolett.7b02929] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Nanoparticles have been used for engineering composite materials to improve the intrinsic properties and/or add functionalities to pristine polymers. The majority of the studies have focused on the incorporation of spherical nanoparticles within the composite fibers. Herein, we incorporate anisotropic branched-shaped zinc oxide (ZnO) nanoparticles into fibrous scaffolds fabricated by electrospinning. The addition of the branched particles resulted in their protrusion from fibers, mimicking the architecture of a rose stem. We demonstrated that the encapsulation of different-shape particles significantly influences the physicochemical and biological activities of the resultant composite scaffolds. In particular, the branched nanoparticles induced heterogeneous crystallization of the polymeric matrix and enhance the ultimate mechanical strain and strength. Moreover, the three-dimensional (3D) nature of the branched ZnO nanoparticles enhanced adhesion properties of the composite scaffolds to the tissues. In addition, the rose stem-like constructs offered excellent antibacterial activity, while supporting the growth of eukaryote cells.
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Affiliation(s)
- Amir Nasajpour
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard−MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Serena Mandla
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard−MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Sindu Shree
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany
| | - Ebrahim Mostafavi
- Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115-5000, United States
| | - Roholah Sharifi
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard−MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Akbar Khalilpour
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard−MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Saghi Saghazadeh
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard−MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Shabir Hassan
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard−MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Michael J. Mitchell
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Department of Chemical Engineering, David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Jeroen Leijten
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard−MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Developmental BioEngineering, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands
| | - Xu Hou
- State Key Laboratory of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Alireza Moshaverinia
- Weintraub Center for Reconstructive Biotechnology Division of Advanced Prosthodontics, School of Dentistry, University of California, Los Angeles, California 90095, United States
| | - Nasim Annabi
- Biomaterials Innovation Research Center, Division of Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, Massachusetts 02139, United States
- Harvard−MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115-5000, United States
| | - Rainer Adelung
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany
| | - Yogendra Kumar Mishra
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany
| | - Su Ryon Shin
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts 02115, United States
- Department of Bioindustrial Technologies, College of Animal Bioscience and Technology, Konkuk University, Seoul, 143-701, The Republic of Korea
| | - Ali Tamayol
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts 02115, United States
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, Nebraska 68588, United States
- Department of Bioindustrial Technologies, College of Animal Bioscience and Technology, Konkuk University, Seoul, 143-701, The Republic of Korea
| | - Ali Khademhosseini
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts 02115, United States
- Department of Bioindustrial Technologies, College of Animal Bioscience and Technology, Konkuk University, Seoul, 143-701, The Republic of Korea
- Center of Nanotechnology, King Abdulaziz University, Jeddah 21569, Saudi Arabia
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20
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Pham MH, Barz DP. Bonding Nafion ® with polydimethysiloxane: A versatile approach towards ion-exchange membrane microfluidic devices. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.05.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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21
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Zhou X, Ma G, Zhao H, Cui J. Self-Forming Interlocking Interfaces on the Immiscible Polymer Bilayers via Gelation-Mediated Phase Separation. Macromol Rapid Commun 2017; 38. [PMID: 28691381 DOI: 10.1002/marc.201700206] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 06/08/2017] [Indexed: 11/10/2022]
Abstract
Gelation-mediated phase separation is applied to prepare immiscible polymer bilayer films with an interlocking interface structure. Polymer systems consisting of copolymer of urea and polydimethylsiloxane and epoxy are selected to demonstrate the feasibility. When the epoxy fraction exceeds 25 wt%, well-defined bilayer structures self-form by a one-pot casting method in which the phase separation state is fixed by an evaporation-induced gelation. Microscopy studies of the resulting bilayers clearly reveal that interlocking structures form during the bilayer films construct. The interlocking structures lead to an enhanced interfacial adhesion and higher fracture energy. The current strategy might offer a facile way to in situ create an interlocking interface between immiscible polymer systems.
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Affiliation(s)
- Xiaozhuang Zhou
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany
| | - Guoqiang Ma
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany
| | - Huaixia Zhao
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany
| | - Jiaxi Cui
- INM - Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany
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22
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Huang P, Shi S, Liu Y, Nie M, Wang Q. Root-like natural fibers in polypropylene prepared via directed diffusion and self-assembly driven by hydrogen bonding. RSC Adv 2017. [DOI: 10.1039/c7ra05095j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Constructing root-like natural fibers in polypropylene via hydrogen bonding-driven diffusion and aggregation of self-assembling molecules.
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Affiliation(s)
- Pei Huang
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Shaohong Shi
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Yuansen Liu
- Engineering Research Center of Marine Biological Resource Comprehensive Utilization
- Third Institute of Oceanography
- State Oceanic Administration
- Xiamen
- China
| | - Min Nie
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
| | - Qi Wang
- State Key Laboratory of Polymer Materials Engineering
- Polymer Research Institute of Sichuan University
- Chengdu 610065
- China
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23
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Baytekin-Gerngross M, Gerngross MD, Carstensen J, Adelung R. Making metal surfaces strong, resistant, and multifunctional by nanoscale-sculpturing. NANOSCALE HORIZONS 2016; 1:467-472. [PMID: 32260710 DOI: 10.1039/c6nh00140h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Surfaces are the crucial and limiting factor in nearly all metal applications, especially when technologically relevant alloys are employed. Insufficient surface properties on the nano- and microscale of metals determine, e.g. metal-polymer composite stability, implant biocompatibility, or corrosion resistance. Conventional surface preparation is just like an arbitrary cut through the metal body optimized for bulk behavior so that such surfaces contain various element mixtures and complex microstructures in which grains and lattice planes vary in their chemical stability from weak to strong. In contrast, the here described novel nanoscale-surface sculpturing based on semiconductor etching knowledge turns surfaces of everyday metals into their most stable configuration, but leaves the bulk properties unaffected. Thus, nanoscale-sculpturing ensures stronger, reliable joints to nearly all materials, reduces corrosion vastly, and generates a multitude of multifunctional surface properties not limited to those shown below.
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Affiliation(s)
- M Baytekin-Gerngross
- Institute for Materials Science, Kiel University, Kaiserstr. 2, 24143 Kiel, Germany.
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24
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Wille S, Hölken I, Haidarschin G, Adelung R, Kern M. Biaxial flexural strength of new Bis-GMA/TEGDMA based composites with different fillers for dental applications. Dent Mater 2016; 32:1073-8. [DOI: 10.1016/j.dental.2016.06.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 03/11/2016] [Accepted: 06/16/2016] [Indexed: 11/29/2022]
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25
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Gu Z, Li S, Zhang F, Wang S. Understanding Surface Adhesion in Nature: A Peeling Model. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2016; 3:1500327. [PMID: 27812476 PMCID: PMC5066691 DOI: 10.1002/advs.201500327] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 11/03/2015] [Indexed: 05/11/2023]
Abstract
Nature often exhibits various interesting and unique adhesive surfaces. The attempt to understand the natural adhesion phenomena can continuously guide the design of artificial adhesive surfaces by proposing simplified models of surface adhesion. Among those models, a peeling model can often effectively reflect the adhesive property between two surfaces during their attachment and detachment processes. In the context, this review summarizes the recent advances about the peeling model in understanding unique adhesive properties on natural and artificial surfaces. It mainly includes four parts: a brief introduction to natural surface adhesion, the theoretical basis and progress of the peeling model, application of the peeling model, and finally, conclusions. It is believed that this review is helpful to various fields, such as surface engineering, biomedicine, microelectronics, and so on.
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Affiliation(s)
- Zhen Gu
- Laboratory of Bio-Inspired Smart Interface Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 PR China
| | - Siheng Li
- Laboratory of Bio-Inspired Smart Interface Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 PR China
| | - Feilong Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS) Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China; University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Shutao Wang
- Laboratory of Bio-Inspired Smart Interface Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 PR China
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Regulation of MicroRNAs, and the Correlations of MicroRNAs and Their Targeted Genes by Zinc Oxide Nanoparticles in Ovarian Granulosa Cells. PLoS One 2016; 11:e0155865. [PMID: 27196542 PMCID: PMC4873213 DOI: 10.1371/journal.pone.0155865] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Accepted: 05/05/2016] [Indexed: 11/19/2022] Open
Abstract
Zinc oxide (ZnO) nanoparticles (NPs) have been applied in numerous industrial products and personal care products like sunscreens and cosmetics. The released ZnO NPs from consumer and household products into the environment might pose potential health issues for animals and humans. In this study the expression of microRNAs and the correlations of microRNAs and their targeted genes in ZnO NPs treated chicken ovarian granulosa cells were investigated. ZnSO4 was used as the sole Zn2+ provider to differentiate the effects of NPs from Zn2+. It was found that ZnO-NP-5 μg/ml specifically regulated the expression of microRNAs involved in embryonic development although ZnO-NP-5 μg/ml and ZnSO4-10 μg/ml treatments produced the same intracellular Zn concentrations and resulted in similar cell growth inhibition. And ZnO-NP-5 μg/ml also specifically regulated the correlations of microRNAs and their targeted genes. This is the first investigation that intact NPs in ZnO-NP-5 μg/ml treatment specifically regulated the expression of microRNAs, and the correlations of microRNAs and their targeted genes compared to that by Zn2+. This expands our knowledge for biological effects of ZnO NPs and at the same time it raises the health concerns that ZnO NPs might adversely affect our biological systems, even the reproductive systems through regulation of specific signaling pathways.
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27
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ZnO Hierarchical Nanostructure Photoanode in a CdS Quantum Dot-Sensitized Solar Cell. PLoS One 2015; 10:e0138298. [PMID: 26379268 PMCID: PMC4574909 DOI: 10.1371/journal.pone.0138298] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 08/29/2015] [Indexed: 11/19/2022] Open
Abstract
A hierarchical array of ZnO nanocones covered with ZnO nanospikes was hydrothermally fabricated and employed as the photoanode in a CdS quantum dot-sensitized solar cell (QDSSC). This QDSSC outperformed the QDSSC based on a simple ZnO nanocone photoanode in all the four principal photovoltaic parameters. Using the hierarchical photoanode dramatically increased the short circuit current density and also slightly raised the open circuit voltage and the fill factor. As a result, the conversion efficiency of the QDSSC based on the hierarchical photoanode was more than twice that of the QDSSC based on the simple ZnO nanocone photoanode. This improvement is attributable to both the enlarged specific area of the photoanode and the reduction in the recombination of the photoexcited electrons.
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Najim M, Modi G, Mishra YK, Adelung R, Singh D, Agarwala V. Ultra-wide bandwidth with enhanced microwave absorption of electroless Ni-P coated tetrapod-shaped ZnO nano- and microstructures. Phys Chem Chem Phys 2015; 17:22923-33. [PMID: 26267361 DOI: 10.1039/c5cp03488d] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A viable lightweight absorber is the current need for stealth technology as well as microwave absorption. Several microwave absorbers have been developed, but it is still a challenge to fabricate an absorber that facilitates microwave absorption in broad bandwidth or covers the maximum portion of the frequency range 2-18 GHz, the commonly used range for radar and other applications. Therefore, it is highly required to develop a wide bandwidth absorber that can provide microwave absorption in the most part of the frequency range 2-18 GHz while simultaneously being lightweight and can be fabricated in desired bulk quantities by the cost-effective synthesis methods. In this paper, an attempt has been made to design an ultra-wide bandwidth absorber with enhanced microwave absorption response by using nickel-phosphorus coated tetrapod-shaped ZnO (Ni-P coated T-ZnO). In the Ni-P coated T-ZnO absorber, ZnO acts as a good dielectric contributor, while Ni as a magnetic constituent to obtain a microwave absorbing composite material, which has favorable absorption properties. Ni-P coated ZnO nano-microstructures are synthesized by a simple and scalable two-step process. First, tetrapod-shaped ZnO (T-ZnO) structures have been grown by the flame transport synthesis (FTS) approach in a single step process and then they have been coated with Ni-P by an electroless coating technique. Their morphology, degree of crystallinity and existing phases were studied in detail by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The complex permittivity and permeability of the "as-fabricated" T-ZnO and Ni-P coated T-ZnO have been measured in the frequency range of 4-14 GHz and their microwave absorption properties are computed using the coaxial transmission-reflection method. The strongest reflection loss (RL) peak value of -36.41 dB has been obtained at a frequency of ∼8.99 GHz with coating thickness of 3.4 mm for the Ni-P coated T-ZnO sample with a broad bandwidth of 10.0 GHz (RL < -10 dB) in the frequency range of 4.0-14.0 GHz.
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Affiliation(s)
- Mohd Najim
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, Uttarakhand, India
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29
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Individual and Co Transport Study of Titanium Dioxide NPs and Zinc Oxide NPs in Porous Media. PLoS One 2015; 10:e0134796. [PMID: 26252479 PMCID: PMC4529095 DOI: 10.1371/journal.pone.0134796] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 07/14/2015] [Indexed: 11/19/2022] Open
Abstract
The impact of pH and ionic strength on the mobility (individual and co-transport) and deposition kinetics of TiO2 and ZnO NPs in porous media was systematically investigated in this study. Packed column experiments were performed over a series of environmentally relevant ionic strengths with both NaCl (0.1-10 mM) and CaCl2 (0.01-0.1mM) solutions and at pH 5, 7, and 9. The transport of TiO2 NPs at pH 5 was not significantly affected by ZnO NPs in solution. At pH 7, a decrease in TiO2 NP transport was noted with co-existence of ZnO NPs, while at pH 9 an increase in the transport was observed. At pH 5 and 7, the transport of ZnO NPs was decreased when TiO2 NPs was present in the solution, and at pH 9, an increase was noted. The breakthrough curves (BTC) were noted to be sensitive to the solution chemistries; the decrease in the breakthrough plateau with increasing ionic strength was observed under all examined pH (5, 7, and 9). The retention profiles were the inverse of the plateaus of BTCs, as expected from mass balance considerations. Overall, the results from this study suggest that solution chemistries (ionic strength and pH) are likely the key factors that govern the individual and co-transport behavior of TiO2 and ZnO NPs in sand.
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30
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Khan YA, Singh BR, Ullah R, Shoeb M, Naqvi AH, Abidi SMA. Anthelmintic Effect of Biocompatible Zinc Oxide Nanoparticles (ZnO NPs) on Gigantocotyle explanatum, a Neglected Parasite of Indian Water Buffalo. PLoS One 2015; 10:e0133086. [PMID: 26177503 PMCID: PMC4503779 DOI: 10.1371/journal.pone.0133086] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 06/22/2015] [Indexed: 01/05/2023] Open
Abstract
Helminth parasites of veterinary importance cause huge revenue losses to agrarian economy worldwide. With the emergence of drug resistance against the current formulations, there is a need to focus on the alternative approaches in order to control this menace. In the present study, biocompatible zinc oxide nanoparticles (ZnO NPs) were used to see their in vitro effect on the biliary amphistomes, Gigantocotyle explanatum, infecting Bubalus bubalis because these nanoparticles are involved in generation of free radicals that induce oxidative stress, resulting in disruption of cellular machinery. The ZnO NPs were synthesized by using egg albumin as a biotemplate and subsequently characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Diffraction and Spectrophotometrical, which showed that ZnO NPs were highly purified wurtzite type polycrystals, with a mean size of 16.7 nm. When the parasites were treated with lower concentrations (0.004% and 0.008%) of the ZnO NPs, the worms mounted a protective response by stimulating the antioxidant system but the treatment of G. explanatum with 0.012% ZnO NPs produced significant inhibition of the antioxidant enzymes like superoxide dismutase (SOD) (p< 0.05) and glutathione S- transferase (GST) (p<0.01), while the level of malondialdehyde (MDA), a lipid peroxidation marker, was significantly (p< 0.01) elevated. SEM and histopathology revealed pronounced tegumental damage showing the disruption of surface papillae and the annulations, particularly in the posterior region near acetabulum. The under expression of a number of polypeptides, loss of worm motility in a time dependent manner, further reflect strong anthelmintic potential of ZnO NPs. It can be concluded that the anthelmintic effect might be due to the production of reactive oxygen species that target a variety of macromolecules such as nucleic acid, protein and lipids which are involved in different cellular processes.
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Affiliation(s)
- Yasir Akhtar Khan
- Section of Parasitology, Department of Zoology, Aligarh Muslim University, Aligarh, 202002, India
| | - Braj Raj Singh
- Centre of Excellence in Material Science (Nanomaterial), Department of Applied Physics, ZHCET, Aligarh Muslim University, Aligarh, 202002, India
| | - Rizwan Ullah
- Section of Parasitology, Department of Zoology, Aligarh Muslim University, Aligarh, 202002, India
| | - Mohd Shoeb
- Centre of Excellence in Material Science (Nanomaterial), Department of Applied Physics, ZHCET, Aligarh Muslim University, Aligarh, 202002, India
| | - Alim H. Naqvi
- Centre of Excellence in Material Science (Nanomaterial), Department of Applied Physics, ZHCET, Aligarh Muslim University, Aligarh, 202002, India
| | - Syed M. A. Abidi
- Section of Parasitology, Department of Zoology, Aligarh Muslim University, Aligarh, 202002, India
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31
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Lee C, Kim SM, Kim YJ, Choi YW, Suh KY, Pang C, Choi M. Robust microzip fastener: repeatable interlocking using polymeric rectangular parallelepiped arrays. ACS APPLIED MATERIALS & INTERFACES 2015; 7:2561-2568. [PMID: 25615547 DOI: 10.1021/am507559d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report a highly repeatable and robust microzip fastener based on the van der Waals force-assisted interlocking between rectangular parallelepiped arrays. To investigate zipperlike interlocking behaviors, various line arrays were fabricated with three different spacing ratios (1, 3, and 5 of 800 nm in width) and width of parallelepipeds (400 nm, 800 nm, and 5 μm with the spacing ratio of 1). In addition, the different rigidity of line arrays was inspected for a repeatable microzip fastener. The normal and shear locking forces were measured with variation of the material rigidity as well as geometry of the array, in good agreement with a proposed theory based on the contact area and force balance. The maximum adhesion forces as high as ∼8.5 N cm(-2) in the normal direction and ∼29.6 N cm(-2) in the shear direction were obtained with high stability up to 1000 cycles. High stability of our fastening system was confirmed for preventing critical failures such as buckling and fracture in practical applications.
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Affiliation(s)
- Chanseok Lee
- Department of Mechanical and Aerospace Engineering, Seoul National University , Seoul 151-742, Republic of Korea
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32
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Som S, Das S, Dutta S, Visser HG, Pandey MK, Kumar P, Dubey RK, Sharma SK. Synthesis of strong red emitting Y2O3:Eu3+ phosphor by potential chemical routes: comparative investigations on the structural evolutions, photometric properties and Judd–Ofelt analysis. RSC Adv 2015. [DOI: 10.1039/c5ra13247a] [Citation(s) in RCA: 111] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
A comparative investigation on the structural and photoluminescence properties of Y2O3:Eu3+ phosphor prepared by different routes such as sol-lyophilisation, combustion, hydrothermal and microwave assisted hydrothermal combustion, has been reported for the first time.
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Affiliation(s)
- S. Som
- Department of Chemical Engineering
- National Taiwan University
- Taipei
- Taiwan
- Department of Applied Physics
| | - Subrata Das
- Department of Chemical Engineering
- National Taiwan University
- Taipei
- Taiwan
- Department of Applied Physics
| | - S. Dutta
- Department of Applied Physics
- Indian School of Mines
- Dhanbad
- India
- Department of Chemistry
| | - Hendrik G. Visser
- Department of Chemistry
- University of the Free State
- Bloemfontein 9300
- South Africa
| | | | - Pushpendra Kumar
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei
- Taiwan
| | - Ritesh Kumar Dubey
- Department of Physics
- S.G.R.P.G. College
- Purvanchal University
- Jaunpur
- India
| | - S. K. Sharma
- Department of Applied Physics
- Indian School of Mines
- Dhanbad
- India
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33
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Influence of Cr incorporation on structural, dielectric and optical properties of ZnO nanoparticles. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2014.01.047] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Roy AK, Dendooven J, Deduytsche D, Devloo-Casier K, Ragaert K, Cardon L, Detavernier C. Plasma-enhanced atomic layer deposition: a gas-phase route to hydrophilic, glueable polytetrafluoroethylene. Chem Commun (Camb) 2015; 51:3556-8. [DOI: 10.1039/c4cc09474c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PE-ALD functionalization of PTFE causes a permanent hydrophilic effect and a significant improvement of the “glueability” of PTFE to aluminium.
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Affiliation(s)
- Amit K. Roy
- Department of Solid State Sciences
- Faculty of Sciences
- Ghent University
- B-9000 Gent
- Belgium
| | - Jolien Dendooven
- Department of Solid State Sciences
- Faculty of Sciences
- Ghent University
- B-9000 Gent
- Belgium
| | - Davy Deduytsche
- Department of Solid State Sciences
- Faculty of Sciences
- Ghent University
- B-9000 Gent
- Belgium
| | - Kilian Devloo-Casier
- Department of Solid State Sciences
- Faculty of Sciences
- Ghent University
- B-9000 Gent
- Belgium
| | - Kim Ragaert
- Centre for Polymer and Material Technologies
- Faculty of Engineering and Architecture
- Ghent University
- B-9052 Zwijnaarde
- Belgium
| | - Ludwig Cardon
- Centre for Polymer and Material Technologies
- Faculty of Engineering and Architecture
- Ghent University
- B-9052 Zwijnaarde
- Belgium
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35
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Jin X, Deng M, Kaps S, Zhu X, Hölken I, Mess K, Adelung R, Mishra YK. Study of tetrapodal ZnO-PDMS composites: a comparison of fillers shapes in stiffness and hydrophobicity improvements. PLoS One 2014; 9:e106991. [PMID: 25208080 PMCID: PMC4160218 DOI: 10.1371/journal.pone.0106991] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 08/05/2014] [Indexed: 11/19/2022] Open
Abstract
ZnO particles of different size and structures were used as fillers to modify the silicone rubber, in order to reveal the effect of the filler shape in the polymer composites. Tetrapodal shaped microparticles, short microfibers/whiskers, and nanosized spherical particles from ZnO have been used as fillers to fabricate the different ZnO-Silicone composites. The detailed microstructures of the fillers as well as synthesized composites using scanning electron microscopy have been presented here. The tensile elastic modulus and water contact angle, which are important parameters for bio-mimetic applications, of fabricated composites with different fillers have been measured and compared. Among all three types of fillers, tetrapodal shaped ZnO microparticles showed the best performance in terms of increase in hydrophobicity of material cross-section as well as the stiffness of the composites. It has been demonstrated that the tetrapodal shaped microparticles gain their advantage due to the special shape, which avoids agglomeration problems as in the case for nanoparticles, and the difficulty of achieving truly random distribution for whisker fillers.
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Affiliation(s)
- Xin Jin
- Functional Nanomaterials, Institute for Materials Science, Christian-Albrechts University of Kiel, Kiel, Germany
| | - Mao Deng
- Synthesis and Real Structures, Institute for Materials Science, Christian-Albrechts University of Kiel, Kiel, Germany
| | - Sören Kaps
- Functional Nanomaterials, Institute for Materials Science, Christian-Albrechts University of Kiel, Kiel, Germany
| | - Xinwei Zhu
- Functional Nanomaterials, Institute for Materials Science, Christian-Albrechts University of Kiel, Kiel, Germany
| | - Iris Hölken
- Functional Nanomaterials, Institute for Materials Science, Christian-Albrechts University of Kiel, Kiel, Germany
| | - Kristin Mess
- Functional Nanomaterials, Institute for Materials Science, Christian-Albrechts University of Kiel, Kiel, Germany
| | - Rainer Adelung
- Functional Nanomaterials, Institute for Materials Science, Christian-Albrechts University of Kiel, Kiel, Germany
| | - Yogendra Kumar Mishra
- Functional Nanomaterials, Institute for Materials Science, Christian-Albrechts University of Kiel, Kiel, Germany
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36
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Jin X, Heepe L, Strueben J, Adelung R, Gorb SN, Staubitz A. Challenges and Solutions for Joining Polymer Materials. Macromol Rapid Commun 2014; 35:1551-70. [DOI: 10.1002/marc.201400200] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 05/18/2014] [Indexed: 12/13/2022]
Affiliation(s)
- Xin Jin
- Institute for Materials Science; Faculty of Engineering; University of Kiel; Kaiserstr. 2 24143 Kiel Germany
| | - Lars Heepe
- Zoological Institute: Functional Morphology and Biomechanics; University of Kiel; Am Botanischen Garten 1-9 24098 Kiel Germany
| | - Jan Strueben
- Otto-Diels-Institute for Organic Chemistry; University of Kiel; Otto-Hahn-Platz 4 24098 Kiel Germany
| | - Rainer Adelung
- Institute for Materials Science; Faculty of Engineering; University of Kiel; Kaiserstr. 2 24143 Kiel Germany
| | - Stanislav N. Gorb
- Zoological Institute: Functional Morphology and Biomechanics; University of Kiel; Am Botanischen Garten 1-9 24098 Kiel Germany
| | - Anne Staubitz
- Otto-Diels-Institute for Organic Chemistry; University of Kiel; Otto-Hahn-Platz 4 24098 Kiel Germany
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37
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Papavlassopoulos H, Mishra YK, Kaps S, Paulowicz I, Abdelaziz R, Elbahri M, Maser E, Adelung R, Röhl C. Toxicity of functional nano-micro zinc oxide tetrapods: impact of cell culture conditions, cellular age and material properties. PLoS One 2014; 9:e84983. [PMID: 24454775 PMCID: PMC3890288 DOI: 10.1371/journal.pone.0084983] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 11/27/2013] [Indexed: 12/30/2022] Open
Abstract
With increasing production and applications of nanostructured zinc oxide, e.g., for biomedical and consumer products, the question of safety is getting more and more important. Different morphologies of zinc oxide structures have been synthesized and accordingly investigated. In this study, we have particularly focused on nano-micro ZnO tetrapods (ZnO-T), because their large scale fabrication has been made possible by a newly introduced flame transport synthesis approach which will probably lead to several new applications. Moreover, ZnO-T provide a completely different morphology then classical spherical ZnO nanoparticles. To get a better understanding of parameters that affect the interactions between ZnO-T and mammalian cells, and thus their biocompatibility, we have examined the impact of cell culture conditions as well as of material properties on cytotoxicity. Our results demonstrate that the cell density of fibroblasts in culture along with their age, i.e., the number of preceding cell divisions, strongly affect the cytotoxic potency of ZnO-T. Concerning the material properties, the toxic potency of ZnO-T is found to be significantly lower than that of spherical ZnO nanoparticles. Furthermore, the morphology of the ZnO-T influenced cellular toxicity in contrast to surface charges modified by UV illumination or O2 treatment and to the material age. Finally, we have observed that direct contact between tetrapods and cells increases their toxicity compared to transwell culture models which allow only an indirect effect via released zinc ions. The results reveal several parameters that can be of importance for the assessment of ZnO-T toxicity in cell cultures and for particle development.
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Affiliation(s)
- Heike Papavlassopoulos
- Institute of Toxicology and Pharmacology for Natural Scientists, Christiana Albertina University Kiel, Kiel, Germany
| | - Yogendra K. Mishra
- Functional Nanomaterials, Institute for Materials Science, Christiana Albertina University Kiel, Kiel, Germany
- * E-mail: (YKM); (CR)
| | - Sören Kaps
- Functional Nanomaterials, Institute for Materials Science, Christiana Albertina University Kiel, Kiel, Germany
| | - Ingo Paulowicz
- Functional Nanomaterials, Institute for Materials Science, Christiana Albertina University Kiel, Kiel, Germany
| | - Ramzy Abdelaziz
- Nanochemistry and Nanoengineering, Institute for Materials Science, Christiana Albertina University Kiel, Kiel, Germany
| | - Mady Elbahri
- Nanochemistry and Nanoengineering, Institute for Materials Science, Christiana Albertina University Kiel, Kiel, Germany
- Nanochemistry and Nanoengineering, Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
| | - Edmund Maser
- Institute of Toxicology and Pharmacology for Natural Scientists, Christiana Albertina University Kiel, Kiel, Germany
| | - Rainer Adelung
- Functional Nanomaterials, Institute for Materials Science, Christiana Albertina University Kiel, Kiel, Germany
| | - Claudia Röhl
- Institute of Toxicology and Pharmacology for Natural Scientists, Christiana Albertina University Kiel, Kiel, Germany
- ZEBET - Alternative Methods to Animal Experiments, Federal Institute for Risk Assessment, Berlin, Germany
- * E-mail: (YKM); (CR)
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38
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Som S, Mitra P, Kumar V, Kumar V, Terblans JJ, Swart HC, Sharma SK. The energy transfer phenomena and colour tunability in Y2O2S:Eu3+/Dy3+ micro-fibers for white emission in solid state lighting applications. Dalton Trans 2014; 43:9860-71. [DOI: 10.1039/c4dt00349g] [Citation(s) in RCA: 173] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This paper reports on the structural, optical and photometric characterization of an Eu3+/Dy3+ doped yttrium oxysulfide phosphor (Y2O2S:Eu3+/Dy3+) for near white emission in solid state lighting.
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Affiliation(s)
- S. Som
- Department of Physics
- University of Free State
- Bloemfontein, South Africa
- Department of Applied Physics
- Indian School of Mines
| | - P. Mitra
- Department of Applied Physics
- Indian School of Mines
- Dhanbad 826004, India
| | - Vijay Kumar
- Department of Physics
- University of Free State
- Bloemfontein, South Africa
| | - Vinod Kumar
- Department of Physics
- University of Free State
- Bloemfontein, South Africa
| | - J. J. Terblans
- Department of Physics
- University of Free State
- Bloemfontein, South Africa
| | - H. C. Swart
- Department of Physics
- University of Free State
- Bloemfontein, South Africa
| | - S. K. Sharma
- Department of Applied Physics
- Indian School of Mines
- Dhanbad 826004, India
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39
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Zhou X, Lin T, Liu Y, Wu C, Zeng X, Jiang D, Zhang YA, Guo T. Structural, optical, and improved field-emission properties of tetrapod-shaped Sn-doped ZnO nanostructures synthesized via thermal evaporation. ACS APPLIED MATERIALS & INTERFACES 2013; 5:10067-10073. [PMID: 24063313 DOI: 10.1021/am4026246] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
High-quality tetrapod-shaped Sn-doped ZnO (T-SZO) nanostructures have been successfully synthesized via the thermal evaporation of mixed Zn and Sn powder. The effects of the Sn dopant on the morphology, microstructure, optical, and field-emission (FE) properties of T-SZO were investigated. It was found that the growth direction of the legs of T-SZO is parallel to the [0001] crystal c-axis direction and that the incorporation of Sn in the ZnO matrix increases the aspect ratio of the tetrapods, leads to blue shift in the UV region, and considerably improves the FE performance. The results also show that tetrapod cathodes with around a 0.84 atom % Sn dosage have the best FE properties, with a turn-on field of 1.95 V/μm, a current density of 950 μA/cm2 at a field of 4.5 V/μm, and a field-enhancement factor as high as 9556.
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Affiliation(s)
- Xiongtu Zhou
- College of Physics and Information Engineering, Fuzhou University , 350002 Fuzhou, China
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40
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Jin X, Götz M, Wille S, Mishra YK, Adelung R, Zollfrank C. A novel concept for self-reporting materials: stress sensitive photoluminescence in ZnO tetrapod filled elastomers. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:1342-1347. [PMID: 23192988 DOI: 10.1002/adma.201203849] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Revised: 10/17/2012] [Indexed: 05/23/2023]
Affiliation(s)
- Xin Jin
- Functional Nanomaterials, Institute for Materials Science, University of Kiel, Kaiser Str. 2, D-24143, Kiel, Germany
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