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SAMPE '09 Spring Symposium Conference Proceedings

作者： Rahatekar, Sameer S Rasheed, Asif Jain, Rahul Zammarano, Mauro Koziol, Krzysztof K. Windle, Alan H. Kumar, Satish Gilman, Jeffery W. Building and Fire Research Division National Institute of Standards and Technology Gaithersburg MD 20899 United States School of Polymer Textile and Fiber Engineering Georgia Institute of Technology Atlanta GA 30332 United States University of Cambridge Materials Science and Metallurgy Cambridge CB2 3QZ United Kingdom US Food and Drug Administration Center for Veterinary Medicine 7500 Standish Place Rockville MD 20855 United States

ISBN: (纸本)9781934551059

Multiwall Carbon nanotubes (MWNTs)/cellulose composite fibers were prepared using solution spinning with cellulose dissolved in ethyl-methyl imidazolium acetate (EMI-acetate). MWNTs in different concentrations were used to make cellulose/MWNT composite solutions in ethylmethyl imidazoluim acetate (EMI-acetate). MWNT form above 0.0007 mass fraction form a network. Scanning electron microscopy images of cellulose fibers show very high alignment of MWNTs in the fiber axis direction. Moderate improvement (30%) in the tensile strength of MWNT/cellulose composite fibers was observed by adding up to 0.07 mass fraction MWNTs as compared to neat cellulose fibers.

关键词： Cellulose

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Bioinspired design of hydrogel-encapsulated underwater flow sensors

Bioinspired design of hydrogel-encapsulated underwater flow ...

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235th ACS National Meeting, Spring 2008

作者： Lu, David H. McConney, Michael E. Han, Too Reneker, Darrell H. Tsukruk, Vladimir V. School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA United States School of Polymer Textile and Fiber Engineering Georgia Institute of Technology Atlanta GA United States Department of Polymer Science University of Akron Akron OH United States

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Assembling of carbon nanotube structures by chemical anchoring for packaging applications

Assembling of carbon nanotube structures by chemical anchori...

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Electronic Components and Technology Conference (ECTC)

作者： Wei Lin Yonghao Xiu Lingbo Zhu Kyoung-Sik Moon C. P. Wong School of Polymer Textile & Fiber Engineering Georgia Institute of Technology Atlanta GA USA School of Material Science & Engineering Georgia Institute of Technology Atlanta GA USA

As IC performance increases, many technical challenges appear in the areas of current-carrying capacities, thermal management, I/O density, and thermal-mechanical reliability. To address these problems, the use of aligned carbon nanotubes (CNTs) has been proposed in IC packaging for electrical interconnect and thermal interface materials (TIMs). The theoretically superior electrical, thermal, and mechanical properties of CNTs promise to reduce the interconnect pitch size, increase thermal conductivity, and enhance system reliability, which is expected to bring about revolutionary improvement to microelectronics. However, the problems with the CVD growth process such as high growth temperature and poor adhesion of CNTs to substrates, challenges in selectively patterning CNT structures, high contact resistance of CNT/electrodes and damage of CNT wall structure by wet chemical functionalization, become barriers for CNT applications. In order to overcome these disadvantages, we proposed the "chemical anchoring" process to directly attach aligned CNTs onto gold-coated substrates. This methodology has the following features: 1) in-situ functionalization of CNTs with reactive functional groups during CVD process, which preserves the perfect CNT wall structure and good alignment of CNTs as well as conrrollably tunes the length of functionalized CNTs; 2) covalently bonded interface by employing a self-assembled monolayer (SAM) as the bridging ligand at the CNT-gold substrate interface; 3) low temperature and simple process. Scanning electron microscopy (SEM) was used to characterize the CNT structures and the SAM-treated gold surface. The effectiveness of the in-situ functionalization was studied by XPS (X-ray photoelectron spectroscopy) and FTIR (Fourier transform infrared spectroscopy). Four-point probe testing system was employed to test the electrical performance of the chemically anchored CNT structure. Results showed an Ohmic contact, low electrical resistivity of the

关键词： Assembly Carbon nanotubes Packaging Chemical vapor deposition Thermal management Thermal conductivity Temperature Adhesives Chemical processes Scanning electron microscopy

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Silk fibroin membranes from solvent-crystallized silk fibroin/gelatin blends: Effects of blend and solvent composition

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Materials science and engineering C 2007年第3期27卷 426-431页

作者： Gil, Eun S. Frankowski, David J. Hudson, Samuel M. Spontak, Richard J. Fiber and Polymer Science Program North Carolina State University Raleigh NC 27695 United States Department of Chemical and Biomolecular Engineering North Carolina State University Raleigh NC 27695 United States Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 United States

Protein membranes have been prepared by mixing gelatin (G) with Bombyx mori silk fibroin (SF) and using aqueous methanol (MeOH) to induce SF crystallization. Amorphous blends of these polymers appear quasi-homogeneous, as discerned from visual observation, electron microscopy and Fourier-transform infrared (FTIR) spectroscopy. Upon subsequent exposure to aqueous MeOH, SF undergoes a conformational change from random-coil to β-sheet. This transformation occurs in pure SF, as well as in each of the G/SF blends, as discerned from FTIR spectroscopy and thermal calorimetry. The influence of MeOH-induced SF crystallization on structure and property development has been measured as functions of blend and solvent composition. By preserving a support scaffold above the G helix-to-coil transition temperature, the formation of crystalline SF networks in G/SF blends can be used to stabilize G-based hydrogels or generate SF membranes for biomaterial, pharmaceutical and gas-separation purposes. The present study not only examines the properties of G/SF blends before and after SF crystallization, but also establishes the foundation for future research into thermally-responsive G/SF bioconjugates. © 2006 Elsevier B.V. All rights reserved.

关键词： Membranes

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3D Rutile Titania‐Based Structures withMorphoButterfly Wing Scale Morphologies†

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Angewandte Chemie 2008年第41期120卷

作者： Michael R. Weatherspoon Ye Cai Matija Crne Mohan Srinivasarao Kenneth H. Sandhage School of Materials Science and Engineering School of Chemistry and Biochemistry Georgia Institute of Technology 771 Ferst Drive Atlanta GA 30332‐0245 (USA) Fax: (+1) 404‐385‐3734 http://www.gems.gatech.edu School of Chemistry and Biochemistry Georgia Institute of Technology School of Polymer Textile and Fiber Engineering School of Chemistry and Biochemistry Georgia Institute of Technology 801 Ferst Drive Atlanta GA 30332‐0295 (USA) Fax: (+1) 404‐894‐8780

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A novel superabsorbent: Clay/polyacrylamide nanocomposite hydrogel

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2007 International Conference on Advanced fibers and polymer Materials, ICAFPM 2007

作者： Liu, Yang Zhu, Meifang Zhang, Wei Liu, Xiaoli Zhang, Yu Yu, Hao Jiang, Yongmei Chen, Yanmo Ruckling, Dirk Adler, Hans-Juergen P. State Key Lab. for Modification of Chemical Fiber and Polymer Materials College of Material Science and Engineering Donghua University 1882 West Yan-An Road Shanghai 201620 China Institute of Macromolecular Chemistry and Textile Chemistry Dresden University of Technology Mommsenstr. 13 D-01069 Dresden Germany

ISBN: (纸本)9787122012234

A novel superabsorbent, clay/polyacrylamide nanocomposite hydrogels(S-M gel), has been successfully prepared. It was found that the properties of S-M gel can be modulated by post treatment;the swelling ratio of S-M gels increases greatly by heat post treatment, much more than any other reported NC gels. Experimental results indicate that the improvements in swelling ratio are due to the physical structure changes of S-M gels. This finding will help to further investigate the structure of NC gels, and present a new approach to control the properties and structure of NC gels.

关键词： Hydrogels

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Inside Front Cover: polymer–Silicon Flexible Structures for Fast Chemical Vapor Detection (Adv. Mater. 23/2007)

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Advanced Materials 2007年第23期19卷

作者： S. Singamaneni M. E. McConney M. C. LeMieux H. Jiang J. O. Enlow T. J. Bunning R. R. Naik V. V. Tsukruk School of Materials Science and Engineering and School of Polymer Textile and Fiber Engineering Georgia Institute of Technology Atlanta GA 30332 (USA) Chemical Engineering Department Stanford University Stanford CA 94305 (USA) Materials and Manufacturing Directorate Air Force Research Laboratory Wright‐Patterson Air Force Base OH 45433

Vladimir Tsukruk and co‐workers demonstrate on p. 4248 the application of plasma‐polymerized organic/silicon bimaterial structures as highly sensitive and agile chemical sensors. Owing to their unique nanoscale topology, highly crosslinked structure, and precise choice of the precursors, polymer films coated on microcantilevers exhibited record sensitivity to water vapor and other volatile organic compounds in conjunction with fast response times. The inside cover image by Brian Schrank shows the bimaterial structure deflection in the presence of a stimuli vapor.

关键词： Coatings Plasma polymerization polymer composites Sensors Silicon

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Mechanical Properties and Phase Transition of High Clay Content Clay/Poly(N-isopropylacrylamide) Nanocomposite Hydrogel

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Macromolecular Symposia 2007年第1期254卷

作者： Yang Liu Meifang Zhu Xiaoli Liu Y.M. Jiang Y. Ma Z.Y. Qin Dirk Kuckling Hans-Jurgen P. Adler State Key Lab for Modification of Chemical Fiber and Polymer Materials College of Material Science and Engineering Donghua University 1882 West Yan-an Road Shanghai 200051 China Institute of Macromolecular Chemistry and Textile Chemistry Dresden University of Technology Mommsenstr. 13 D-01069 Dresden Germany

Summary: A series of high clay content Clay-S/PNIPAAm nanocomposite hydrogels (S-N gels) has been successfully prepared by in situ polymerization. Their mechanical properties and phase transition behavior has been systematically investigated. It was found that S-N gels show high tensile strength, high elongation at break, fast stress relaxation, high hysteresis, and poor resilience, which may be ascribed to the hydrophilicity and flexibility of PNIPAAm chains. It was also concluded that the macroscopic phase transition behavior of S-N gels depend on the ratio of Segments II (thermosensitive segments) to Segments I (non-thermosensitive segments).

关键词： clay gels hydrogels nanocomposites

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Inside Front Cover: Field‐Driven Biofunctionalization of polymer fiber Surfaces during Electrospinning (Adv. Mater. 1/2007)

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Advanced Materials 2007年第1期19卷

作者： X.‐Y. Sun R. Shankar H. G. Börner T. K. Ghosh R. J. Spontak Department of Chemical & Biomolecular Engineering North Carolina State University Raleigh NC 27695 USA Department of Materials Science & Engineering North Carolina State University Raleigh NC 27695 USA Fiber & Polymer Science Program North Carolina State University Raleigh NC 27695 USA Department of Colloid Chemistry Max‐Planck Institute of Colloids & Interfaces 14424 Potsdam Germany

Surface‐biofunctionalized synthetic polymer fibers composed of a fiber‐forming host polymer and an oligopeptide conjugate can be prepared from electrospinning, report Spontak and co‐workers on p. 87. The conjugate consists of a polypeptide segment and a polymer block that is compatible with the host polymer. Because the more polarizable peptide segment migrates to the surface during electrospinning, peptide surface‐enrichment is achieved in a single step without further treatment.

关键词： Biocompatible materials Block copolymers Electrospinning fibers Peptides Poly(ethylene oxide) Surface functionalization

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Steam superdrawing of hollow PET fibers

Steam superdrawing of hollow PET fibers

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International fiber Conference 2006: Extreme and Aesthetic textiles, IFC 2006

作者： Aneja, Arun Pal Wang, Youjiang College of Technology and Computer Science East Carolina University GreenvilleNC United States School of Polymer Textile and Fiber Engineering Georgia Institute of Technology AtlantaGA United States

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