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

作者： Kim, Mi Nae Kim, Hyungsup Cho, Kwang-Soo Yeum, Jeong Hyun Department of Textile Engineering Konkuk University Seoul Korea Republic of Department of Polymer Science College of Engineering Kyungpook National University Daegu Korea Republic of Department of Natural Fiber Science College of Agriculture and Life Sciences Kyungpook National University Daegu Korea Republic of

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The effect of extensional strains on molecular orientation, polymer free volume distribution and crystallization 16

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16th European Conference of Fracture

作者： Dong, Hai Guo, Ruilan Jacob, Karl I. School of Polymer Textile and Fiber Engineering G.W.W School of Mechanical Engineering AtlantaGA30332-0295 United States School of Material Science and Engineering G.W.W School of Mechanical Engineering AtlantaGA30332-0295 United States Georgia Institute of Technology G.W.W School of Mechanical Engineering AtlantaGA30332-0295 United States

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IEEE EMBS technical committee on wearable biomedical sensors & systems: Position paper

IEEE EMBS technical committee on wearable biomedical sensors...

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BSN 2006: International Workshop on Wearable and Implantable Body Sensor Networks

作者： Bonato, Paolo De Rossi, Danilo Dittmar, Andre Jayaraman, Sundaresan Korhonen, Ilkka Lymberis, Andreas Adams, Eric Me Zhang, Yuan-Ting Dept. of PM and R Harvard Medical School Spaulding Rehabilitation Hospital Boston United States Harvard-MIT Division of Health Science and Technology Cambridge United States Interdiparimental Centre of Research E. Piaggio Pisa Italy LPM CNRS INSA Lyon France Georgia Institute of Technology School of Polymer Textile and Fiber Engineering Atlanta United States Ubiquitous Computing VTT Information Technology Tampere Finland European Commission Information Society Directorate-General Brussels Belgium NIBEC University of Ulster Northern United Kingdom Joint Research Center for Biomedical Engineering Chinese University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0769525474

The IEEE engineering in Medicine and Biology Society (EMBS) established a technical committee on wearable biomedical sensors and systems (WBSS) in 2004. This position paper presents the view of the technical committee on the field of wearable sensors and systems in medicine, and shortly introduces its plan of action. The purpose of the position paper is to raise awareness of the initiatives of EMBS concerning WBSS and to encourage collaborations in order to advance research and development in the field of WBSS. © 2006 IEEE.

关键词： Biosensors

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IEEE EMBS technical committee on wearable biomedical sensors & systems: position paper

IEEE EMBS technical committee on wearable biomedical sensors...

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International Workshop on Wearable and Implantable Body Sensor Networks (BSN)

作者： P. Bonato D. De Rossi A. Dittmar S. Jayaraman I. Korhonen A. Lymberis E. Me Adams Y.-T. Zhang The Harvard-MIT Division of Health Science and Technology Cambridge USA Department of PM&R Harvard Medical School Spaulding Rehabilitation Hospital Boston USA Interdepartmental Research Center Enrico Piaggio Pisa Italy LPM CNRS/INSA Lyon France School of Polymer Textile & Fiber Engineering Georgia Institute of Technology Atlanta USA Ubiquitous Computing VTT Information Technology Tampere Finland Information Society Directorate-General European Commission Brussels Belgium Joint Research Center for Biomedical Engineering Chinese University of Hong Kong China

关键词： Biosensors Biomedical monitoring Wearable sensors Medical services textile technology Biomedical engineering Humans Medical diagnostic imaging Research and development Actuators

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Functionalized three-arm poly(ε-caprolactone) maleic acid microspheres for controlled protein release

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American Journal of Drug Delivery 2005年第4期3卷 253-267页

作者： Wu, Da-Qing Zhang, Xiang-Zheng Chu, Chih-Chang Fiber and Polymer Science Program Department of Textiles and Apparel and Biomedical Engineering Program Cornell University Ithaca NY United States Fiber and Polymer Science Program Department of Textiles and Apparel and Biomedical Engineering Program Cornell University Ithaca NY 14853-4401 United States

Introduction: The objective of this work was to fabricate a novel class of protein carriers from double-bond-functionalized multiarm poly(ε- caprolactone) maleic acid (PGCLM) microspheres and to examine protein sustained-release profiles in vitro over a period of a few months. Methods: The double-emulsion technique was used to formulate terminal functionalized three-arm PGCLM microspheres having three different types of functional groups (-OH, -COOH, and -C = C-), and one of the functional groups (>C = < bonds) was used to formulate surface-crosslinked microspheres (NPGCLM). Ovalbumin (OVA) was used as a model protein for examining its release profiles from PGCLM and NPGCLM microspheres in 0.1M phosphate-buffered saline (PBS) at 37°C. These microspheres were also characterized in terms of their morphology, size distribution, and stability. Results: The mean size of fabricated microspheres ranged from 21.9μm to 51.1μm. An OVA protein was successfully encapsulated into these biodegradable PGCLM microspheres with loading efficiency ranging from 34.2% to 46% (w/w), depending on the ratio of PGCLM to polyvinyl alcohol (PVA) stabilizer. Depending on the polymer to PVA stabilizer ratio, the cumulative OVA release % (w/w) in 0.1M PBS at 37°C ranged from 30% to 40% within 50 days. We further demonstrated the availability of the functional >C = C< bonds on the surface of PGCLM microspheres, which we expect could be used for either covalent binding of bioactive agents or imparting different chemical characteristics onto the surface of the microspheres for broadening of their applications. Discussion/Conclusion: A method for the preparation of biodegradable microspheres from water/oil emulsion of multiarm and functionalized poly(ε-caprolactone) [PGCL, PGCLM, and NPGCLM] was reported as a potential means of developing injectable therapeutic formulations for drugs. The most unique aspect of these biodegradable microspheres is the availability of two functional groups (>C = C< bon

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Fracture of CSL boundaries in Cu and Al

Fracture of CSL boundaries in Cu and Al

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11th International Conference on Fracture 2005, ICF11

作者： Spearot, Douglas E. Jacob, Karl I. McDowell, David L. G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332 United States School of Polymer Textile and Fiber Engineering Georgia Institute of Technology Atlanta GA 30332 United States School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 United States

ISBN: (纸本)9781617820632

Molecular dynamics (MD) simulations using embedded-atom method (EAM) potentials are used to study the fundamental failure processes that occur on the nanoscale in copper and aluminum as a result of an applied boundary deformation. This work focuses on tensile deformation and fracture of 'near' and 'exact' Coincident Site Lattice (CSL) grain boundaries. Previous experimental and simulation work has shown that grain boundaries with CSL misorientations may have a lower grain boundary energy, which suggests that these boundaries may have unique fracture properties as compared with general high-angle grain boundaries. In this communication we study grain boundary interface models formed by a symmetric rotation of the opposing lattice regions around a [100] misorientation axis. Interface structures are created using a 0 K energy minimization procedure with a nonlinear conjugate gradient algorithm. Tensile deformation calculations are performed at 300 K using appropriate temperature controls. For the range of interface misorientation angles examined in this work, the interface structure appears to play a role in the tensile deformation response. Specifically, the peak tensile stress within the interface region shows a modest increase for interface models with exact ∑5 (310) orientation in copper and exact ∑5 (210) orientation in aluminum. Interface models with near ∑5 interface misorientations show a reduced peak stress by comparison. An approximation of interface porosity on the nanoscale is calculated by monitoring the coordination number of each atom within the interface region. MD simulations show that the nanoporosity measurement is capable of differentiating between grain boundaries on the nanoscale, and thus is appropriate to relate the interface structure to the interface strength for the purpose of making connections to microstructure-sensitive continuum interface separation potentials.

关键词： Molecular dynamics

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Nondestructive damage sensitivity and reinforcing effect of functionalized carbon nanotube and nanofiber/epoxy composites using electro-micromechanical techniques

Nondestructive damage sensitivity and reinforcing effect of ...

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2004 MRS Fall Meeting

作者： Park, Joung-Man Jung, Jin-Kyu Kim, Sung-Ju Kim, Dae-Sik Lee, Jae-Rock Kim, Tae-Wook Department of Polymer Science and Engineering Engineering Research Institute Gyeongsang National University Jinju 660-701 Korea Republic of Fiber Science Program Cornell University Ithaca NY 14853-4401 United States Advanced Materials Division Korea Research Institute of Chemical Technology Yusong Taejeon 305-600 Korea Republic of Composite Materials Group Korea Institute of Machinery and Materials Chanwon 641-010 Korea Republic of

Nondestructive damage sensing and load transfer mechanisms of thermal treated carbon nanotube (CNT) and nanofiber (CNF)/epoxy composites were investigated using electromicromechanical technique. Carbon black (CB) was used only for the comparison. Electromicromechanical techniques were applied to obtain the fiber damage and stress transferring effect of carbon nanocomposites with their contents. Thermal treatment and temperature affected on apparent modulus and electrical properties on nanocomposites due to enhanced inherent properties of each CNMs. Coefficient of variation (COV) of volumetric electrical resistance can be used to obtain the dispersion degree indirectly for various CNMs. Dispersion and surface modification are very important parameters to obtain improved mechanical and electrical properties of CNMs for multifunctional applications. Further optimized functionalization and dispersion conditions will be investigated for the following work continuously. © 2005 Materials Research Society.

关键词： Carbon nanotubes

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Polyacrylonitrile single-walled carbon nanotube composite fibers (vol 16, pg 58, 2004)

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ADVANCED MATERIALS 2004年第18期16卷 1583-1583页

作者： Sreekumar, TV Liu, T Min, BG Go, H Kumar, S Hauge, RH Smalley, RE School of Polymer Textile and Fiber Engineering Georgia Institute of Technology Atlanta GA 30332 USA Permanent address: School of Advanced Materials and System Engineering Kumoh Institute of Technology Kumi 730‐701 Korea. Center for Nanoscale Science and Technology Rice University Houston TX 77005 USA

Polyacrylonitrile (PAN) fibers containing 10 wt.‐% single‐walled carbon nanotubes (SWNTs) exhibit a 100 % improvement in tensile modulus and reduced thermal shrinkage and polymer solubility. A 40 °C increase in glass transition temperature as compared to the control PAN fiber is also observed (see Figure). SWNT anisotropy has been observed using infrared spectroscopy.

关键词： Carbon nanotubes fibers Nanocomposites

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Pore structure analysis of swollen dextran-methacrylate hydrogels by SEM and mercury intrusion porosimetry

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Journal of Biomedical Materials Research Part B: Applied Biomaterials 2002年第3期53卷

作者： Sin–hee Kim Chih–Chang Chu Fiber and Polymer Science Program Department of Textiles & Apparel and Biomedical Engineering Program Cornell University Ithaca NY 14853

The objectives of this study were to visually examine the surface and interior morphology of a new class of biodegradable hydrogels based on dextran-methacrylate and to quantify the porous structure of these hydrogels in swollen state. Two techniques (scanning electron microscopy and mercury intrusion porosimetry) were used to analyze pore structure of dextran-methacrylate hydrogels as a function of the degree of methacrylate substitution. SEM was used to observe 3-dimensional network structure of cryofixed and fractured swollen dextran-methacrylate hydrogels. Image analysis of the SEM data revealed different pore shapes and sizes, depending on the degree of substitution and the location within the hydrogel. A higher methacrylate-substituted dextran hydrogel showed a compact and rigid pore structure, while a lower substituted hydrogel showed a delicate and fragile pore structure. Mercury intrusion porosimetry analysis of the pore structure of dextran-methacrylate hydrogels provided useful and more reliable quantitative data of pore characteristics, such as total pore area, average pore diameter, their distribution, and bulk density. The total pore area and average pore diameter of swollen dextran-methacrylate hydrogels decreased with an increase in degree of methacrylate substitution, while bulk density increased with an increase in degree of substitution. © 2000 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 53: 258–266, 2000

关键词： dextran-methacrylate hydrogel pore structure scanning electron microscopy mercury intrusion porosimetry morphology image analysis

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Interchange reaction kinetics and sequence distribution of liquid crystalline poly(ethylene terephthalate- co -2(3)-chloro-1,4-phenylene terephthalate)

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fibers and polymers 2001年第2期2卷 86-91页

作者： Do Mook Rhee Wan Shik Ha Ji Ho Youk Dong Il Yoo Samyang Group Central R & D Center Taejeon Korea Department of Textile Engineering Chonnam National University Kwangju Korea Department of Fiber and Polymer Science Seoul National University Seoul Korea Department of Chemistry University of Alabama at Birmingham Birmingham USA

Liquid crystalline (LC) poly(ethylene terephthalate-co-2(3)-chloro-1,4-phenylene terephthalate) [copoly(ET/CPT)] was prepared using poly(ethylene terephthalate) (PET) as a flexible spacer, terephthalic acid (TPA), and chlorohydroquinone diacetate (CHQDA). All reactions involved in the copolymerization were investigated using some model compounds: TPA was used for acidolysis, diphenylethyl terephthalate (DPET) for interchange reaction between PET chains, and di-o-chlorophenyl terephthalate (DOCT) and di-m-chlorophenyl terephthalate (DMCT) for interchange reaction between PET and rigid rodlike segments. Activation energies obtained for the acidolysis of PET with TPA and for interchange reaction of PET with DPET, DOCT, and DMCT were 19.8 kcal/mole, 26.5 kcal/mole, 60.2 kcal/mole, and 45.9 kcal/mole, respectively. This result supports that the copolymerization proceeds through the acidolysis of PET with TPA first and subsequent polycondensation between carboxyl end group and CHQDA or acetyl end group, which is formed from the reaction of CHQDA and TPA. Also, it was found that ester-interchange reaction can be influenced by the steric hindrance. Copoly(ET/CPT)s obtained had ethylene acetate end groups formed from acetic acid and hydroxy ethylene end groups and showed almost the random sequence distribution for all compositions.

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