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Biologically Inspired Design: Color on Wings

MRS Online Proceedings Library (OPL) 2012年第1期479卷 117-117页

作者： Mohan Srinivasarao Luis Padilla Department of Textile Engineering Chemistry and Science Fiber & Polymer Science Program North Carolina State University Raleigh NC 27695-8301

Brilliant, iridescent colors found on the bodies and wings of many birds, butterflies and moths are produced by structural variations and have been the subject of study for centuries. Such brilliant colors have been described as metallic colors due to the saturation or purity of the color produced and have attracted the attention of great scientists like Newton, Michelson and Lord Rayleigh. It was recognized early on that such colors arise from physical effects such as interference or diffraction as opposed to colors that are normally produced due to the presence of chromophores which absorb or emit light. Common examples of physical colors are some butterfly wings [1], color of Indigo snake skin [2], hummingbird feathers [3,4], arthropod cuticles [which are due to selective reflection of color from the solidified cholesteric phase of chitin crystallites] [5], gemstones like opal [6,7], and some crystals like potassium chlorate [8]. While the origins of such colors are well understood the properties of color and color specification have not received much attention.

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Li<sub>2</sub>MnSiO<sub>4</sub>/Carbon Composite Nanofibers as a High-Capacity Cathode Material for Li-Ion Batteries

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Soft Nanoscience Letters 2012年第3期2卷 54-57页

作者： Shu Zhang Ying Li Guanjie Xu Shuli Li Yao Lu Ozan Topracki Xiangwu Zhang Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC.

Li2MnSiO4 has an extremely high theoretical capacity of 332 mAh?g?1. However, only around half of this capacity has been realized in practice and the capacity retention during cycling is also low. In this study, Li2MnSiO4/carbon composite nanofibers were prepared by a combination of electrospinning and heat treatment. The one-dimensional continuous carbon nanofiber matrix serves as long-distance conductive pathways for both electrons and ions. The composite nanofiber structure avoids the aggregation of Li2MnSiO4 particles, which in turn enhances the electrode conductivity and promotes the reaction kinetics. The resultant Li2MnSiO4/carbon composite nanofibers were used as the cathode material for Li-ion batteries, and they delivered high charge and discharge capacities of 218 and 185 mAh?g?1, respectively, at the second cycle. In addition, the capacity retention of Li2MnSiO4 at the first 20th cycles increased from 37% to 54% in composite nanofibers.

关键词： Electrospinning Li2MnSiO4 Carbon Nanofibers Li-Ion Battery

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Novel Atmospheric plasma enhanced Silk Fibroin nanofiber/Gauze composite wound dressings

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Journal of fiber Bioengineering and Informatics 2012年第3期5卷 227-242页

作者： Nawalakhe, Rupesh Shi, Quan Vitchuli, Narendiran Bourham, Mohamed A. Zhang, Xiangwu Mccord, Marian G. Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC 27695-8301 United States Department of Nuclear Engineering North Carolina State University Raleigh NC 27695-7909 United States Joint Department of Biomedical Engineering North Carolina State University Raleigh NC 27695-7115 United States University of North Carolina Chapel Hill NC 27599 United States

In this work, Silk Fibroin (SF) nanofibers were electrospun onto plasma-treated 100% cotton gauze bandages to form a novel silk-gauze composite wound dressing. Atmospheric pressure plasma pre- and post- treatments were used to increase the adhesion between the SF nanofibers and cotton substrates. The adhesion of the nanofibers to the substrates was assessed by qualitative and quantitative techniques. Plasma pre-treatment of the substrate with 100% helium and 99% helium/1% oxygen plasmas showed up to a 50% increase in the force required to peel off the nanofiber layer. This force was further increased up to 75% after pre- as well as post-plasma treatment of the composite bandages. Plasma pre-treatment of the gauze fabric prior to nanofiber deposition and post-treatment to the composite bandages significantly reduced degradation of the nanofiber layer during repetitive flexing. Air permeability and moisture vapor transport were significantly reduced due to the presence of a nanofiber layer upon the substrate. The results of surface elemental analysis showed that the adhesion and durability increase are mainly due to the active species generated by plasma on the surface of cotton substrate as well as on the surface of the silk fibroin nanofibers. © 2012 Binary Information Press & Textile Bioengineering and Informatics Society.

关键词： Adhesion

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Electrospun LATP /PAN composite fiber-based membrane for lithium-ion battery separators

Electrospun LATP /PAN composite fiber-based membrane for lit...

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2011 International Conference on Advanced fibers and polymer Materials, ICAFPM 2011

作者： Liang, Yinzheng Qiu, Yiping Zhang, Xiangwu Department of Textile Materials Science and Product Design College of Textile Donghua University Shanghai 201620 China Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC 27695-8301 United States

ISBN: (纸本)9787122120199

The lithium aluminum titanium phosphate (LATP)/Polyacrylonitrile (PAN) composite fiber-based membrane were prepared by electrospinning composite solution of LATP and PAN in N, N-dimethylformamide(DMF). The crystallization phase of the LATP particles were characterized by X-ray diffraction(XRD). The electrolyte uptakes of the electrospun LATP/PAN composite fiber-based membranes were also evaluated. In addition, the electrochemical performance of the liquid electrolyte-soaked electrospun LATP/PAN composite fiber-based is also improved after the introduction of LATP particles.

关键词： Electrospinning

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Aggregation-induced emission and biological application of tetraphenylethene luminogens

Aggregation-induced emission and biological application of t...

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作者： Hong, Yuning Lam, Jacky Wing Yip Chen, Sijie Tang, Ben Zhong Department of Chemistry Nano Science and Technology Program Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Polymer Science and Engineering Institute of Biomedical Macromolecules Zhejiang University Hangzhou 310027 China

Tetraphenylethene derivatives [Ph(PhCH=CHPhR)C=C(PhCH=CHPhR)Ph, R=H, CN, NO2, NPh2] with green, yellow-green, and orange emission colours were designed and synthesized. These molecules are practically non-emissive in their dilute solutions but emit intensely as nanoaggregates in poor solvents, demonstrating a novel phenomenon of aggregation-induced emission. Their blended films with poly(methyl methacrylate) also display bright emissions. Restriction of intramolecular motion in the condensed phase may be responsible for such unusual behaviour. Multilayer electroluminescence devices with a configuration of indium tin oxide/N,N′-di(1-naphthyl)-N,N′- diphenylbenzidine/emitter/tris(8-hydroxyquinolinolato)aluminum (Alq 3)/LiF/Al were constructed, which gave green light with a maximum luminance and current efficiency of 12930 cdcm-2 and 3.04cd A -1 respectively. The tetraphenylethenes can serve as excellent cell staining agents for selectively illuminating the cytoplasm and vesicles of living cells. © 2011 CSIRO.

关键词： Cytology

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Biodegradable microfluidic scaffolds with tunable degradation properties from amino alcohol-based poly(ester amide) elastomers

Biodegradable microfluidic scaffolds with tunable degradatio...

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2010 MRS Fall Meeting

作者： Wang, Jane Kniazeva, Tatiana Campbell, Carly F. Langer, Robert Ustin, Jeffrey S. Borenstein, Jeffrey T. Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 United States Biomedical Engineering Charles Stark Draper Laboratory Cambridge MA 02139 United States Program of Polymer Science and Technology Massachusetts Institute of Technology Cambridge MA 02139 United States Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 United States Trauma Surgery Cleveland MetroHealth Hospital Cleveland OH 44106 United States

ISBN: (纸本)9781605112763

Biodegradable polymers with high mechanical strength, flexibility and optical transparency, optimal degradation properties and biocompatibility are critical to the success of tissue engineered devices and drug delivery systems. In this work, microfluidic devices have been fabricated from elastomeric scaffolds with tunable degradation properties for applications in tissue engineering and regenerative medicine. Most biodegradable polymers suffer from short half life resulting from rapid and poorly controlled degradation upon implantation, exceedingly high stiffness, and limited compatibility with chemical functionalization. Here we report the first microfluidic devices constructed from a recently developed class of biodegradable elastomeric poly(ester amide)s, poly(1,3-diamino-2-hydroxypropane-co-polyol sebacate)s (APS), showing a much longer and highly tunable in vivo degradation half-life comparing to many other commonly used biodegradable polymers. The device is molded in a similar approach to that reported previously for conventional biodegradable polymers, and the bonded microfluidic channels are shown to be capable of supporting physiologic levels of flow and pressure. The device has been tested for degradation rate and gas permeation properties in order to predict performance in the implantation environment. This device is high resolution and fully biodegradable;the fabrication process is fast, inexpensive, reproducible, and scalable, making it the approach ideal for both rapid prototyping and manufacturing of tissue engineering scaffolds and vasculature and tissue and organ replacements. © 2011 Materials Research Society.

关键词： Degradation

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Biodegradable Microfluidic Scaffolds with Tunable Degradation Properties from Amino Alcohol-based Poly(ester amide) Elastomers

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MRS Online Proceedings Library 2011年第1期1299卷 1-6页

作者： Jane Wang Tatiana Kniazeva Carly F. Campbell Robert Langer Jeffrey S. Ustin Jeffrey T. Borenstein Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge USA Biomedical Engineering Charles Stark Draper Laboratory Cambridge USA Program of Polymer Science and Technology Massachusetts Institute of Technology Cambridge USA Department of Chemical Engineering Massachusetts Institute of Technology Cambridge USA Trauma Surgery Cleveland MetroHealth Hospital Cleveland USA

Biodegradable polymers with high mechanical strength, flexibility and optical transparency, optimal degradation properties and biocompatibility are critical to the success of tissue engineered devices and drug delivery systems. In this work, microfluidic devices have been fabricated from elastomeric scaffolds with tunable degradation properties for applications in tissue engineering and regenerative medicine. Most biodegradable polymers suffer from short half life resulting from rapid and poorly controlled degradation upon implantation, exceedingly high stiffness, and limited compatibility with chemical functionalization. Here we report the first microfluidic devices constructed from a recently developed class of biodegradable elastomeric poly(ester amide)s, poly(1,3-diamino-2-hydroxypropane-co-polyol sebacate)s (APS), showing a much longer and highly tunable in vivo degradation half-life comparing to many other commonly used biodegradable polymers. The device is molded in a similar approach to that reported previously for conventional biodegradable polymers, and the bonded microfluidic channels are shown to be capable of supporting physiologic levels of flow and pressure. The device has been tested for degradation rate and gas permeation properties in order to predict performance in the implantation environment. This device is high resolution and fully biodegradable; the fabrication process is fast, inexpensive, reproducible, and scalable, making it the approach ideal for both rapid prototyping and manufacturing of tissue engineering scaffolds and vasculature and tissue and organ replacements.

关键词： biomaterial microelectro-mechanical (MEMS) polymer

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Advanced energy-storage nanofibers for high-energy lithium-ion batteries

Advanced energy-storage nanofibers for high-energy lithium-i...

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fiber Society 2010 Fall Meeting and Technical Conference

作者： Zhang, Xiangwu Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University RaleighNC27695-8301 United States

Research and development in textiles have gone beyond the conventional applications as clothing and furnishing materials;for example, the convergence of textiles, nanotechnologies, and energy science opens up the opportunity to take on one of the major challenges in the 21st century-energy. This presentation addresses the development of high-energy lithium-ion batteries using electrospun nanofibers.

关键词： Textiles

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Electrospun nanofibers for energy storage

Electrospun nanofibers for energy storage

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American Association of Textile Chemists and Colorists International Conference 2010

作者： Alcoutlabi, Mataz Ji, Liwen Guo, Bingkun Li, Shuli Li, Ying Zhang, Shu Toprakci, Ozan Zhang, Xiangwu Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC 27695-8301 United States

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Challenges in Advanced nanofiber wound dressings

Challenges in Advanced nanofiber wound dressings

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fiber Society 2010 Fall Meeting and Technical Conference

作者： Shi, Quan McCord, Marian Bourham, Mohamed Zhang, Xiangwu Nawalakhe, Rupesh Vitchuli, Narendiran Nowak, Joshua Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University RaleighNC27695-8301 United States Department of Nuclear Engineering North Carolina State University RaleighNC27695-7909 United States

Conventional textile-based wound dressings are cost-effective and highly absorbent, but used alone, fail to provide optimal wound healing conditions (hemostasis, non-adherence, maintenance of a moist wound bed, etc.). Modern wound dressings often incorporate multiple non-textile components (films, gels, antimicrobials, and biological forms) that provide advanced functionalities at a significantly higher cost. Electrospun nanofiber dressings have demonstrated the potential to revolutionize wound care by providing significantly enhanced moisture management, barrier properties, and bioactivity. However, nanofiber webs are inherently weak and difficult to handle. Deposition of electrospun nanofiber coatings on a conventional textile bandages addresses the need for structural support, but faces challenges of delamination due to compliance mismatch or poor adhesion. Atmospheric plasma has been shown to increase adhesion of coatings to fibers due to enhanced surface chemistry and/or morphology.

关键词： Textiles

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