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2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007

作者： Jin, K.S. Jin, S. Yoon, J. Heo, K. Kim, J. Kim, H. Ree, M. BK21 Program Polymer Research Institute Pohang University of Science and Technology Pohang 790-784 Korea Republic of Department of Microbiology Dongguk University College of Medicine Gyeongju 780-714 Korea Republic of

ISBN: (纸本)1420061828

Solution small angle X-ray scattering (SAXS) is an effective technique for measuring structure and structural difference of protein under various environments, quantitatively. Structural characteristics of various conformational states of porcine pepsin were studied in terms of size and shape under several pH conditions by solution SAXS. Under nearly physiologically enzymatic active conditions, the reconstructed models exhibit a more extended C-terminal domain, when compare to the crystal structure. The structural differences between solution and crystal structure of pepsin can be accounted for the inherent conformations of the flexible subdomain in the C-terminal domain in solution under carefully controlled specific pH conditions. Furthermore, this flexibility may provide a clue that lead to the solution of enzymatic inactivity of pepsin under mild acidic conditions. The structural evidences presented may have important implication in establishing relationship between the structure of porcine pepsin and its enzymatic function.

关键词： Enzymes

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Biocompatibilities of some synthetic polymers in films

Biocompatibilities of some synthetic polymers in films

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2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007

作者： Kim, Gahee Ree, Moonhor Kim, Heesoo BK21 Program Polymer Research Institute Pohang University of Science and Technology Pohang 790-784 Korea Republic of Department of Microbiology Dongguk University College of Medicine Gyeongju 780-350 Korea Republic of

We chose two synthetic polymers (poly(vinylidene fluoride-co- hexafluoropropylene) and Nafion-117&reg) and studied their biocompatibility to several bacteria that are most notorious for opportunistic and iatrogeni... 详细信息

ISBN: (纸本)1420061836

We chose two synthetic polymers (poly(vinylidene fluoride-co- hexafluoropropylene) and Nafion-117®) and studied their biocompatibility to several bacteria that are most notorious for opportunistic and iatrogenic infections.

关键词： polymer films

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Preparation and characterization of polymeric capsules containing functional additives

Preparation and characterization of polymeric capsules conta...

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Society of Plastics Engineers Annual Technical Conference 2006, ANTEC 2006

作者： Park, K. Feng, W. Kim, K. Xanthos, M. Materials Science and Engineering Program New Jersey Institute of Technology Newark NJ 07102 Otto H. York Department of Chemical Engineering New Jersey Institute of Technology Newark NJ 07102 Polymer Processing Institute New Jersey Institute of Technology Newark NJ 07102 Seoul National University Korea Republic of

In attempts to develop novel functional additives for thermoplastic and thermoset polymer coatings, various sizes of microcapsules containing a silicone fluid which could facilitate the release of the coating from a metallic substrate were prepared by in-situ polymerization. Fill content, size of capsules, wall-thickness, and surface morphology were observed by TGA, TEM, SEM, EDX, optical and NMR microscopy. The capsules were dispersed in polymeric coatings and the release of their content through mechanical means was followed microscopically.

关键词： Organic polymers

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Solvent mediated assembly of nanoparticles confined in mesoporous alumina

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Physical Review B 2006年第12期73卷 125412-125412页

作者： Kyle J. Alvine Diego Pontoni Oleg G. Shpyrko Peter S. Pershan David J. Cookson Kyusoon Shin Thomas P. Russell Markus Brunnbauer Francesco Stellacci Oleg Gang Division of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA Center for Nanoscale Materials Argonne National Laboratory Argonne Illinois 60439 USA Department of Physics Harvard University Cambridge Massachusetts 02138 USA Australian Synchrotron Research Program Building 434 Argonne National Laboratory Argonne Illinois 60439 USA Department of Polymer Science and Engineering University of Massachusetts Amherst Massachusetts 01003 USA Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Center for Functional Nanomaterials Brookhaven National Lab Upton New York 11973 USA

The controlled self-assembly of thiol stabilized gold nanocrystals in a mediating solvent and confined within mesoporous alumina was probed in situ with small angle x-ray scattering. The evolution of the self-assembly process was controlled reversibly via regulated changes in the amount of solvent condensed from an undersaturated vapor. Analysis indicated that the nanoparticles self-assembled into cylindrical monolayers within the porous template. Nanoparticle nearest-neighbor separation within the monolayer increased and the ordering decreased with the controlled addition of solvent. The process was reversible with the removal of solvent. Isotropic clusters of nanoparticles were also observed to form temporarily during desorption of the liquid solvent and disappeared upon complete removal of liquid. Measurements of the absorption and desorption of the solvent showed strong hysteresis upon thermal cycling. In addition, the capillary filling transition for the solvent in the nanoparticle-doped pores was shifted to larger chemical potential, relative to the liquid/vapor coexistence, by a factor of 4 as compared to the expected value for the same system without nanoparticles.

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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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Nondestructive Damage Sensitivity and Reinforcing Effect of Functionalized Carbon Nanotube and Nanofiber/Epoxy Composites Using Electro-Micromechanical Techniques

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MRS Online Proceedings Library 2005年第1期851卷 200-205页

作者： Joung-Man Park Jin-Kyu Jung Sung-Ju Kim Dae-Sik Kim Jae-Rock Lee Tae-Wook Kim Department of Polymer Science and Engineering Engineering Research Institute Gyeongsang National University Jinju Korea Tiber Science Program Cornell University Ithaca U.S.A. Advanced Materials Division Korea Research Institute of Chemical Technology Yusong Korea Composite Materials Group Korea Institute of Machinery and Materials Chanwon Korea

Nondestructive damage sensing and load transfer mechanisms of thermal treated carbon nanotube (CNT) and nanofiber (CNF)/epoxy composites were investigated using electro-micromechanical technique. Carbon black (CB) was used only for the comparison. Electro-micromechanical 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.

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Onset of Tethered Chain Overcrowding

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Physical Review Letters 2004年第2期93卷 028301-028301页

作者： William Y. Chen Joseph X. Zheng Stephen Z. D. Cheng Christopher Y. Li Ping Huang Lei Zhu Huiming Xiong Qing Ge Ya Guo Rodric P. Quirk Bernard Lotz Lingfeng Deng Chi Wu Edwin L. Thomas Maurice Morton Institute and Department of Polymer Science The University of Akron Akron Ohio 44325-3909 USA Department of Materials Science and Engineering Drexel University Philadelphia Pennsylvania 19104 USA Polymer Program Institute of Materials Science and Department of Chemical Engineering The University of Connecticut Storrs Connecticut 06269-3136 USA Institute of Charles Sadron 6 Rue Boussingault Strasbourg 67083 France Departments of Physics and Chemistry Hong Kong Chinese University Sha Tin Hong Kong Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

We proposed an approach to precisely control the density of tethered chains on solid substrates using PEO-b-PS and PLLA-b-PS. As the crystallization temperature Tx increased, the PEO or PLLA lamellar crystal thickness dL increased as well as the reduced tethering density σ˜ of the PS chains. The onset of tethered PS chains overcrowding in solution occurs at σ˜*∼3.7–3.8 as evidenced by an abrupt change in the slope between (dL)−1 and Tx. This results from the extra surface free energy created by the tethered chain that starts to affect the growth barrier of the crystalline blocks.

关键词： .PS chains tethered chains PEO PS PEO or PLLA tethered PS

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Synthesis and characterization of silk-like polyurethanes and polyesters using a semi-crystalline soft segment

Synthesis and characterization of silk-like polyurethanes an...

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223rd ACS National Meeting

作者： James-Korley, LaShanda Hammond, Paula T. Department of Chemical Engineering Program in Polymer Science and Technology Massachusetts Institute of Technology 77 Massachusetts Avenue Cambodge MA 02139 United States

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SYNTHESIS OF STYRENIC TONER PARTICLES BY SPG EMULSIFICATION TECHNIQUE

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Chinese Journal of polymer science 2000年第4期18卷 309-322页

作者： Suda Kiatkamjornwong Roongkan Nuisin Guang-HuiMa Shinzo Omi Department of Imaging and Printing Technology Faculty of ScienceChulalongkorn University.Bangkok 10330Thailand Multi-disciplinary Program of Petrochemistry and Polymer Faculty of ScienceChulalongkorn UniversityBangkok 10330Thailand Graduate School of Bio-application and System Engineering Tokyo University of Agriculture and TechnologyNakamachiKoganeiTokyo 184-8588Japan

This research studied the initiator efficiency for producing polymeric particles of poly(styrene-co-methyl methacrylate)copolymers by a Shirasu porous glass membrane(SPG)emulsification technique followed by suspension ***,ADVN,and AIBN were used as initiators and we found that BPO is the most suitable *** for various feed ratios of styrene/methyl methacrylate were thus synthesized by benzoyl peroxide,and their copolymer particle size,molecular weight distribution and pat-ride size distribution were *** n-BMA or 2-EHMA was added as the third monomer to decrease the terpolymer glass transition *** article describes the preparation technique,recipes and polymerization conditions for producing both copolymer and terpolymer particles,particle size changes,the corresponding particle morphologies and glass transition temperatures.

关键词： Shirasu porous glass emulsification n-butyl methacrylate 2-ethylhexyl methacrylate toner binder

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Chemical Aging, Charge Transport, and Electroluminescence in Alq 3-based Organic Light-Emitting Diodes

Chemical Aging, Charge Transport, and Electroluminescence in...

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IS and T's NIP16: International Conference on Digital Printing Technologies

作者： Higginson, Keith A. Mathai, Mathew K. Jain, Faquir Papadimitrakopoulos, Fotios Hsieh, Bing R. Polymer Science Program Institute of Materials Science University of Connecticut Storrs CT Xerox Corporation Wilson Ctr. for Res. and Technology Webster NY

Conduction in aluminum(III) 8-hydroxyquinoline (Alq3) was modeled based on trap-charge limited conduction of electrons in the bulk. The evolution of a narrow Gaussian distribution of localized trap states below the lowest unoccupied molecular orbital (LUMO) of Alq3, lying against a natural exponential background, was used to explain changes in the current-voltage characteristic and external quantum efficiency with time observed by many researchers for organic light-emitting diodes. Based on the change of the shape of the J-V curve, the depth of the electron trap states that were formed during aging was about 0.25 eV below the LUMO of Alq 3. An increase in drive voltage and decrease in efficiency is predicted with aging by this model for current densities in a reasonable range, assuming that the evolved trap states are non-emissive and also non-quenching. The products of chemical aging can account for the generation of traps at the observed depth.

关键词： Light emitting diodes

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