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Generalization of in-situ polymerization method for preparing core-shell polymeric nanospheres and hollow spheres

中国高等学校学术文摘·化学 2007年第3期2卷 287-291页

作者： ZHANG Youwei ZHAO Jiongxin JIANG Ming WANG Jiaye Macromolecular Science Department and The Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai 200433China College of Materials Science and Engineering and The State Key Laboratory for Modification of Chemical Fibers and Polymer College of Materials Science and Engineering and The State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China Macromolecular Science Department and The Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai 200433China

According to the new method of preparing core-shell nanospheres developed by our group,by using two monomers,2-hydroxypropyl methacrylate(HPMA) and vinyl acetate(VAc),two kinds of core-shell nanospheres with poly(ε-caprolactone) (PCL) as the core and crosslinked poly(2-hydroxypropyl methacrylate) (PHPMA) or poly(vinyl acetate) (PVAc) as the shell were successfully prepared under similar *** degrading the PCL cores of the two kinds of nanospheres by lipase,the corresponding crosslinked poly(methyl acrylic acid) hollow spheres and crosslinked poly(vinyl alcohol) hollow spheres were *** indicate that the new method we proposed for preparing core-shell polymeric nanospheres via in-situ polymerization can be generalized to a certain extent,and it is suitable for many systems provided the monomer used is soluble in water,while its corresponding polymer is insoluble in water.

关键词： core-shell structure polymeric nanospheres hollow spheres preparation generalization

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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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Biodegradable polymer coated 45S5 Bioglass-derived glass-ceramic scaffolds for bone tissue engineering

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Glass Technology: European Journal of Glass science and Technology Part A 2007年第5期48卷 227-234页

作者： Bretcanu, Oana Chen, Qizhi Misra, Superb K. Boccaccini, Aldo R. Roy, Ipsita Verne, Enrica Brovarone, Chiara Vitale Department of Materials Imperial College London Prince Consort Road London SW7 2BP United Kingdom Department of Molecular and Applied Biosciences University of Westminster London W1W 6UW United Kingdom Department of Materials Science and Chemical Engineering Politecnico di Torino 10129 Turin Italy

Three-dimensional, highly porous foam-like composite scaffolds were fabricated by coating 45S5 Bioglass-derived glass-ceramic foams with a biodegradable poly-(3-hydroxybutyrate) (PHB) layer. The PHB was produced by bacteria isolation, using afermentation process. The glass-ceramic scaffolds were fabricated by the replication technique using 45S5 Bioglass powder. The sintering process was optimised in order to increase the mechanical strength of the foam scaffolds. During sintering, the glass crystallises, forming a mixed sodium calcium silicate (Na2Ca2Si3O 9) phase. The microstructure of the composite scaffolds was analysed by scanning electron microscopy and x-ray diffraction. The polymer coating did not affect the interconnectivity of the pore structure. The compressive strength of the coated and uncoated scaffolds was measured and it was found that the polymer coating considerably increased the compressive strength of the scaffolds. Bioactivity was studied by soaking the samples in a simulated body fluid (SBF) to assess the formation of hydroxy apatite (HA) crystals on the scaffolds' surfaces. It was found that these novel composite scaffolds are highly bioactive, as after two weeks of immersion in SBF, a uniform layer of HA crystals was formed. The novel Bioglass/PHB composite foams are promising candidates for bone tissue engineering scaffolds.

关键词： Scaffolds

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X-Ray Diffuse Scattering Measurements of Nucleation Dynamics at Femtosecond Resolution

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Physical Review Letters 2008年第13期100卷 135502-135502页

作者： A. M. Lindenberg S. Engemann K. J. Gaffney K. Sokolowski-Tinten J. Larsson P. B. Hillyard D. A. Reis D. M. Fritz J. Arthur R. A. Akre M. J. George A. Deb P. H. Bucksbaum J. Hajdu D. A. Meyer M. Nicoul C. Blome Th. Tschentscher A. L. Cavalieri R. W. Falcone S. H. Lee R. Pahl J. Rudati P. H. Fuoss A. J. Nelson P. Krejcik D. P. Siddons P. Lorazo J. B. Hastings PULSE Center Stanford Linear Accelerator Center Menlo Park California 94025 USA Stanford University Department of Materials Science and Engineering Stanford California 94305 USA Stanford Synchrotron Radiation Laboratory/SLAC Menlo Park California 94025 USA* Institut für Experimentelle Physik Universität Duisberg-Essen D-45117 Essen Germany Department of Physics Lund Institute of Technology P.O. Box 118 S-22100 Lund Sweden Department of Chemistry Stanford University Stanford California 94305 USA FOCUS Center Department of Physics and Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA Stanford Linear Accelerator Center Menlo Park California 94025 USA Department of Cell and Molecular Biology Biomedical Centre Uppsala University SE-75124 Uppsala Sweden Stanford University Department of Chemistry Stanford California 94305 USA Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany Max-Planck-Institute of Quantum Optics Hans-Kopfermann-Str. 1 D-85748 Garching Germany Department of Physics University of California Berkeley California 94720 USA Length/Time Metrology Group Korea Research Institute of Standards and Science Daejeon 305-600 Republic of Korea Consortium for Advanced Radiation Sources The University of Chicago Chicago Illinois 60637 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA Physics Department Lawrence Livermore National Laboratory Livermore California 94550 USA National Synchrotron Light Source Brookhaven National Laboratory Upton New York 11973 USA Departement de Genie Physique Ecole Polytechnique de Montreal C.P. 6079 Succursale Centre-Ville Montreal (Quebec) Canada H3C 3A7

Femtosecond time-resolved small and wide angle x-ray diffuse scattering techniques are applied to investigate the ultrafast nucleation processes that occur during the ablation process in semiconducting materials. Following intense optical excitation, a transient liquid state of high compressibility characterized by large-amplitude density fluctuations is observed and the buildup of these fluctuations is measured in real time. Small-angle scattering measurements reveal snapshots of the spontaneous nucleation of nanoscale voids within a metastable liquid and support theoretical predictions of the ablation process.

关键词： Ultrashort pulses

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Electrochemical release of immobilized IgG protein

Electrochemical release of immobilized IgG protein

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Functional materials for chemical and Biochemical Sensors - 2007 MRS Spring Meeting

作者： Mahmud, Tanveer Wlodarski, Wojtek Mitchell, Arnan Gras, Sally Trinchi, Adrian Kalantar-Zadeh, Kourosh School of Electrical and Computer Engineering RMIT University Melbourne VIC 3001 Australia Department of Chemical and Biomolecular Engineering Bio21 Molecular Science and Biotechnology University of Melbourne Melbourne VIC 3004 Australia Manufacturing and Materials Technology CSIRO Melbourne VIC Australia

ISBN: (纸本)9781605604435

In this paper, we present the electrochemically programmed release of immobilized IgG protein molecules that have been attached to gold coated surfaces via a thiol-gold linkage. Fluorescence microscopy has been used to image the release of fluorescently tagged IgGs in phosphate buffered saline. In this technique, the reductive desorption of self-assembled monolayers is employed for the release of proteins, which are immobilized on the surface either by non-covalent or covalent interactions. The voltage applied for the release of proteins is in a range of -1.5V to -60V. © 2007 materials Research Society.

关键词： Proteins

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Abstracts for the 6th Congress of Asian Sleep Research Society

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Sleep and Biological Rhythms 2009年第4期7卷 A1-A49页

作者： Seog Ju Kim In Kyoon Lyoo Yu-Jin Lee Do-Un Jeong Hirohiko Kanai Masanori Ookubo Atsushi Yoshimura Masako Okawa Noto Yamada Takeshi Munezawa Yoshitaka Kaneita Yoneatsu Osaki Hideyuki Kanda Tadahiro Ohtsu Masumi Minowa Kenji Suzuki Susumu Hijuchi Hiroyuki Suzuki Takashi Ohida Takashi Abe Yoko Komada Shoichi Asaoka Yuichi Inoue Jin-Seong Lee Sang-Yong Cho Deependra Kumar Hruda N. Mallick Velayudhan M. Kumar Mahesh K. Kaushik Akihiro Karashima Noiihiro Katayama Mitsuyuki Nakao Ravindra P. Nagendra Sathiamma Sulekha Sathyaprabha T. Narasappa Pradhan Nityanadan Bindu M. Kutty M. Nirmala P. N. Ravindra Basavaraj Ramappa Tubaki T. N. Sathyaprabha D. Sudhakar G. S. Lavekar C. R. Chandrashekar Kazuyoshi Kitaoka Mika Shimizu Sachiko Chikahisa Kazuo Yoshizaki Hiroyoshi Sei Jong-Won Kim Misa Takegami Shin Yamazaki Yasuaki Hayashino Rei Ono Koji Otani Miho Sekiguchi Shinichi Konno Shunichi Fukuhara Antonia J. Jakobson Paul Fitzgerald Russell Conduit Xin Shirley Li Siu Ping Joyce Lam Wai Man Mandy Yu Yun Kwok Wing Kazue Okamoto-Mizuno Koh Mizuno Mituaki Yamamoto Shuichiro Shirakawa Hirokazu Doi Mikako Kato Kazuyuki Shinohara Masako Tamaki Shiori Matsuda Katsuo Yamazaki Tadao Hori Keiko Ogawa Kazumi Takahashi Kunio Kitahama Katuo Yamazaki Yoshimasa Koyama Kohei Shioda Yugo Ueda Yukiko Nakamura Clara Inoue Kazushige Goto Sunao Uchida Yuko Morita Yoshiko Honda Tohru Kodama Mari Hagihara Toru Nakajima Masato Saito Yoshihiko Koga Shinichiro Tanaka Hiroshi Yamadera Madoka Takahara Sachiko Suwa Minoru Onozuka Sadao Sato Fumiharu Togo Taiki Komatsu Takeshi Mitani Jongbae Choi Bin Zhang Taeko Sasai Hiromi Mitsubayashi Mitsuhiro Ohtsu Isao Hasegawa Tatsuya Ishii Akira Komori Asami Suzuki Yue Nakahara Mitsuyasu Hiroki Mariko Nakauma Nobuo Someya Tomomasa Ochiai Shouhei Komori Rayleigh Ping-Ying Chiang Zai-Ting Yeh Seong T. Kim Seung H. Yoon Jeong S. Kwon Jong H. Choi Hyung J. Ahn Youngsoo Kim Bolortuya Yunren Lichao Chen Radhika Basheer Robert W. Mccarley Robert E. Strecker Makoto Honda Tetsuaki Arai Miyuki Fukazawa Yutaka Honda Kuniaki T Department of Psychiatry Gachon University of Medicine and Science Incheon Republic of Korea Department of Psychiatry Seoul National University Seoul Republic of Korea Department of Neuropsychiatry and Center for Sleep and Chronobiology Seoul National University Hospital Seoul Republic of Korea Department of Neuropsychiatry Seoul National University Hospital Seoul Republic of Korea Seoul National University Hospital Seoul Republic of Korea Department of Psychiatry Shiga University of Medical Science Otsu Japan Division of Public Health Department of Social Medicine Nihon University School of Medicine Tokyo Japan Department of Public Health Nihon University School of Medicine Tokyo Japan Division of Environmental and Preventive Medicine Department of Social Medicine Faculty of Medicine Tottori University Yonago Japan Department of Hygiene and Preventive Medicine Fukushima Medical University Fukushima Japan Department of Public Health Showa University School of Medicine Tokyo Japan Faculty of Humanities Seitoku University Matsudo Japan Section on Behavioral Science Division of Clinical Research National Hospital Organization Kurihama Alcoholism Center Yokosuka Japan Department of Otolaryngology Second Hospital Fujita Health University Nagoya Japan National Hospital Organization Kurihama Alcoholism Center Kanagawa Japan Metropolitan Police Department Criminal Investigation Laboratory Tokyo Japan Japan Somnology Center Neuropsychiatrie Research Institute Tokyo Japan Department of Somnology Tokyo Medical University Tokyo Japan Japan Somnology Center Neuropsychiatric Research Institute Tokyo Japan Department of Somnology Tokyo Medical and Dental University Tokyo Japan Center for Sleep and Chronobiology Department of Psychiatry and Behavioral Science Seoul National University College of Medicine Seoul Republic of Korea Department of Psychiatry and Behavioral Science Center for Sleep and Chronobiology Seoul Republic of Korea Department of Physiology Al

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The location of Ti atom in sodium alanate: An ab initio spin-polarised study

The location of Ti atom in sodium alanate: An ab initio spin...

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作者： Du, A.J. Smith, Sean C. Lu, G.Q. Centre for Computational Molecular Science ARC Centre for Functional Nanomaterial University of Queensland Brisbane QLD 4072 Australia University of Queensland Australia Hydrogen Storage Systems Australia Department of Computational Molecular Science University of Queensland Australia Centre for Computational Molecular Science UQ Australia Computational Nanotecnnology Program ARC Centre for Functional Nanomaterials Australia Department of Chemical Engineering in Nanotechnology University of Queensland Australia ARC Centre for Functional Nanomaterials Australia Australian Academy of Technological Sciences and Engineering Australia

In this work, ab initio spin-polarised Density Functional Theory (DFT) calculations are performed to study the interaction of a Ti atom with a NaAlH4(001) surface. We confirm that an interstitially located Ti atom in the NaAlH4 subsurface is the most energetically favoured configuration as recently reported (Chem. Comm. (17) 2006, 1822). On the NaAlH4(001) surface, the Ti atom is most stable when adsorbed between two sodium atoms with an AlH4 unit beneath. A Ti atom on top of an Al atom is also found to be an important structure at low temperatures. The diffusion of Ti from the Al-top site to the Na-bridging site has a low activation barrier of 0.20 eV and may be activated at the experimental temperatures (∼323 K). The diffusion of a Ti atom into the energetically favoured subsurface interstitial site occurs via the Na-bridging surface site and is essentially barrierless. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Titanium

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Third-order nonlinear optical properties of croconium dye for a kind of near infrared dye used as optical record and storage material

Ganguang Kexue yu Guanghuaxue/Photographic Science and Photo...

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Ganguang Kexue yu Guanghuaxue/Photographic science and Photochemistry 2007年第4期25卷 241-248页

作者： Li, Zhong-Yu Xu, Song Huang, Xin Zhang, Fu-Shi Kasatani, Kazuo Key Lab. of Organic Photoelectrons and Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China Department of Chemical Engineering Jilin Institute of Chemical Technology Jilin 132022 China Department of Application Technology Northeast China University of Electric Power Engineering Jilin 132021 China Department of Advanced Materials Science and Engineering Faculty of Engineering Yamaguchi University Tokiwadai Ube 755-8611 Japan

As a new type of near infrared dye, croconium dyes have drawn much attention for their potential applications in the fields of optical record and storage, and nonlinear optical materials because of their thermal and optical stability as well as intense fluorescence. The third-order optical nonlinearities and responses of a croconium dye (1, 3-bis[(3, 3-dimethylindolin-2-ylidene)methyl] croconine) in tetrahydrofuran (THF) solution and in poly (methyl methacrylate) (PMMA) coating films were measured using a femtosecond degenerate four-wave mixing (DFWM) technique with a laser pulse of 130 fs system under resonant conditions. The molecular hyperpolarizability, γ of the croconium dye in THF solution was determined to be about 5.3 × 10-29 esu, and the third-order nonlinear optical susceptibilities, Χ(3) of the present PMMA coating films containing the croconium dye was measured to be of the order of 10-8 esu. Furthermore, the dynamic of DFWM optical response for croconium dye was also studied and analysed.

关键词： Croconium dye Near infrared absorption Nonlinear optics Optical record and storage

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Halogenbrücken in der supramolekularen Chemie

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Angewandte Chemie 2008年第33期120卷

作者： Pierangelo Metrangolo Franck Meyer Tullio Pilati Giuseppe Resnati Giancarlo Terraneo NFMLab Department of Chemistry Materials and Chemical Engineering “Giulio Natta” Politecnico di Milano 7 via Mancinelli 20131 Mailand (Italien) http://nfmlab.chem.polimi.it/ Polo Regionale di Como Politecnico di Milano 7 via Castenuovo 22100 Como (Italien) Fax: (+39) 02‐2399‐3180 Institute of Molecular Science and Technology CNR – University of Milan 19 via Golgi 20131 Mailand (Italien)

Halogenbrücken sind nichtkovalente Wechselwirkungen, in denen Halogenatome als elektrophile Spezies auftreten. Die Energien und geometrischen Charakteristika derartiger Bindungen werden im vorliegenden Kurzaufsatz beschrieben, und es wird diskutiert, welche Voraussetzungen Moleküle erfüllen müssen, um diese Wechselwirkungen eingehen zu können. Die Bildung von Halogenbrücken wirkt sich auf alle Forschungsgebiete aus, die durch molekulare Erkennung und Selbstorganisation bestimmt sind. Es werden einige Prinzipien für das Kristall‐engineering mithilfe von Halogenbrücken vorgestellt. Das Potenzial derartiger Wechselwirkungen zeigt sich auch in Flüssigkristallen, magnetischen und leitfähigen Materialien sowie in biologischen Systemen.

关键词： Anionenkoordination Fluorierte Tektone Halogenbrücken Kristall‐engineering Supramolekulare Chemie

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Electroplating of copper-alumina nanocomposite films with an impinging jet electrode

Electroplating of copper-alumina nanocomposite films with an...

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Electrodeposition of Nanoengineered materials and Alloys 2 - 212th ECS Meeting

作者： Thiemig, Denny Osborne, Steven J. Sweet, Wendi S. Talbot, Jan B. Department of Physical Chemistry and Electrochemistry Dresden University of Technology D-01062 Dresden Germany Materials Science and Engineering Program University of California San Diego 9500 Gilman Dr. San Diego CA 92093 United States Chemical Engineering Program University of California San Diego 9500 Gilman Dr. San Diego CA 92093 United States

ISBN: (纸本)9781605601991

Nanocomposite films of copper-alumina were made with an unsubmerged impinging jet electrode system for a wide range of process variables. The process variables investigated were current density of 5-200 mA/cm2, electrolyte flow rate of 0.5-7.0 L/min, copper sulfate concentrations of 0.25-1 M with pH of either 0.8 or 1.5, and particle loading of 50 nm diameter alumina powder of up to 160 g/L. The amount of particle incorporation was determined using electrogravimetric measurements as well as EDX analysis. The microstructure and hardness of the films were studied. A loss of texture and a decrease in copper crystallite size was found with increasing current density and due to the particle incorporation. Increase in the microhardness of the films correlate with changes in the microstructure, which were dependent upon the deposition conditions and also particle incorporation. © The Electrochemical Society.

关键词： Nanocomposites

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