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作者： Wang, Jie Tsai, Chen-Fong Bi, Zhenxing Naugle, Donald G. Wang, Haiyan Department of Electrical and Computer Engineering Material Science and Engineering Program Texas A and M University College Station TX 77843 United States Department of Physics Texas A and M University College Station TX 77843 United States

In this paper, we report a strong enhancement in the in-field transport properties of the YBa2Cu307-δ (YBCO) thin films doped with magnetic Fe203 nanoparticles. We incorporated magnetic Fe2o3nanoparticles with two different architectures by laser ablation of the YBCO and dopant targets. YBCO film ' thickness was controlled at around 1 μm for all the samples. We conducted a detailed microstructural characterization on all the doped samples by X-ray diffraction (XRD) and cross-sectional transmission electron microscopy (TEM) and compared with the pure YBCO films. A systematic study on the superconducting properties has been conducted on all the thin film samples. The critical current densities at both self-field and in-field (Jcf and j in-field (h//c)) and the critical transition temperature (Tc) of the doped and un-doped YBCO sample were measured by a Superconducting Quantum Interference Device (SQUID). The Tc of the doped YBCO films varies from 84 K-90 K and the Jc is in the range of 1.2-3.9 MA/cm2 (at 65 K) depending on the doping approach. The pinning properties of these doped YBCO films were explored at different temperatures (5 K, 40 K, and 65 K) and correlated with their microstructural characteristics. © 2009 IEEE.

关键词： Nanoparticles

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Preparation of P(NIPAM-co-AA) microcontainers surface-anchored with magnetic nanoparticles

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Langmuir 2009年第14期25卷 8255-8262页

作者： Feng, Zhang Chang-Chun, Wang Key Laboratory of Molecular Engineering of Polymers Ministry of Education and Department of Macromolecular Science Fudan University Shanghai 200433 China School of Material Science and Engineering Yancheng Institute of Technology Yancheng 224003 China

P(NIPAM-co-AA) microcontainers surface-anchored with magnetic nanoparticles were prepared using PSt/P (NIPAM-co-AA) core/shell microspheres and amino-modified Fe3O4@SiO2 particles as building blocks. At first, the PSt/P(NIPAM-co-AA) core/shell microspheres were prepared by seeded emulsion polymerization, and the aminomodified Fe3O4@SiO2 particles were prepared by a modified Stöber method followed by functionalized by 3-aminopropyltriethoxysilane. Then, the smaller amino-modified Fe3O4@SiO2 particles were assembled onto the surface of PSt/P(NIPAM-co-AA) core/shell microspheres by electrostatic interaction. Subsequently, the two particles were permanently combined through amidation reaction between carboxylic groups and amino groups under the catalysis of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide. By dissolving the PStcore with tetrahydrofuran, novel triple-functional microcontainers with superparamagnetism and pH and temperature sensitivity were obtained. © 2009 American Chemical Society.

关键词： Magnetite

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A novel fabrication of Cu-Mn alloy films by chemical displacement process

A novel fabrication of Cu-Mn alloy films by chemical displac...

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Copper Interconnects, New Contact Metallurgies/Structures, and Low-K Inter-Level Dielectrics - 214th ECS Meeting

作者： Lin, Li-Min Yang, Wen-Luh Dai, Ming-Jie Yang, Tsong-Jen Yang, Chin-Hao Huang, Fang-Tse Wang, Chin-An Huang, Shin-Yi Graduate Institute of Electrical and Communications Engineering Ph.D. Program Feng Chia University Taiwan Department of Electronic Engineering Feng Chia University Taiwan Department of Material Science Feng Chia University Taiwan P. O. BOX 25-239 Taichung 40724 Taiwan

ISBN: (纸本)9781615672936

The Cu-Mn alloy films have been successfully fabricated by a novel chemical displacement process. The surface morphologies and displacement rate of Cu-Mn with pH values and temperatures are investigated in this paper. Furthermore, this chemical displacement is a selective deposition between Si and SiO 2, this predominance can apply to self-formed metal layer. The chemical displacement process provides a solution to satisfy for 32 nm node Cu-Mn alloy self-formed barrier requirement. ©The Electrochemical Society.

关键词： Manganese alloys

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Enhanced glucose sensor linearity using poly(vinyl alcohol) hydrogels

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Journal of Diabetes science and Technology 2009年第4期3卷 863-874页

作者： Vaddiraju, SanthiSagar Singh, Hardeep Burgess, Diane J. Jain, Faquir C. Papadimitrakopoulos, Fotios Polymer Program Institute of Material Science University of Connecticut Storrs CT 06269 United States Department of Pharmaceutical Sciences University of Connecticut Storrs CT United States Nanomaterials Optoelectronics Laboratory Electrical and Computer Engineering University of Connecticut Storrs CT United States Department of Chemistry University of Connecticut Storrs CT United States

Background: High linearities, sensitivities, and low oxygen dependence constitute prime requisites for electrochemical glucose sensors. However, for implantable sensors the need to control tissue inflammation requires the use of outer membranes that permit inward analyte diffusion while continuously releasing anti-inflammatory drugs and other tissue response-modifying (TRM) agents. We have shown previously that while outer membranes based on layer-by-layer (LBL) assembly enhance linearity, poly(vinyl alcohol)(PVA) hydrogels loaded with TRM-containing microspheres enable a significant reduction in tissue inflammation. This article discusses the amperometric performance of glucose sensors coated with stacked LBL/PVA hydrogel outer membranes. Methods: Sensors were fabricated by immobilizing glucose oxidase enzyme on a 50-μm platinum wire followed by deposition of stacked LBL/PVA hydrogel outer membranes. The sensor response to various glucose concentrations was determined by applying 0.7 V vs an Ag/AgCl reference electrode in phosphate-buffered saline (37°C). Michaelis-Menten analysis was performed to quantify sensor performance in terms of linearity (Km,gluapp) and oxygen dependence (Km,O2app/[Glucose]). Results: When overlaid onto LBL-assembled outer membranes, PVA hydrogels improved sensor linearity by 60% from 10 to 16 m M of glucose and resulted in a twofold decrease in oxygen dependence. Conclusions: Enhancement in the performance of a PVA-coated sensor is attributed to the oxygen-storing capability of PVA hydrogel due to the formation of hydrophobic domains during its freezing and thawing employed to physical cross-link the PVA. Such membranes with the capability to release TRMs continuously while storing oxygen constitute a major improvement over current outer membrane technologies. © Diabetes Technology Society.

关键词： Apparent Michaelis-Menten constants Biosensor Freeze-thaw cycle Layer-by-layer assembly Linearity Outer membranes Oxygen content Oxygen dependence of biosensors PVA hydrogels

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Size-selective encapsulation property of unimolecular reverse micelle consisting of hyperbranched D-glucan core and L-leucine ethyl ether shell

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macromolecular Symposia 2009年第1期279卷 145-150页

作者： Satoh, Toshifumi Kitajyo, Yoshikazu Sakai, Ryosuke Narumi, Atsushi Takahashi, Kenji Kaga, Harumi Kaneko, Noriaki Kakuchi, Toyoji Division of Biotechnology and Macromolecular Chemistry Graduate School of Engineering Hokkaido University Sapporo 060-8628 Japan Department of Polymer Science and Engineering Graduate School of Science and Engineering Yamagata University Yonezawa 992-8510 Japan Division of Material Science Graduate School Natural Science and Technology Kanazawa University Kanazawa 920-1192 Japan Sapporo 062-8517 Japan MACROTEC Co. Sapporo 062-8517 Japan

The synthesis of a unimolecular reverse micelle (3) consisting of hyper-branched D-glucan as the core and L-leucine ethyl ester as the shell was accomplished through the carbamation reaction of the hyperbranched D-glucan (1) with the N-carbonyl L-leucine ethyl ester (2) in pyridine at 100 °C. The polymer 3 was soluble in a large variety of organic solvents, such as methanol, acetone, chloroform, and ethyl acetate, and insoluble in water, which remarkably differed from the solubility of 1. The solubilities of 3 were also changed by the substitution degrees of the L-leucine moiety. The encapsulation ability of 3 toward water-soluble dyes has been investigated. These results indicated that 3 was a unimolecular reverse micelle with an encapsulation ability toward hydrophilic dye molecules. In addition, 3 showed an molecular size-selective encapsulation ability. Copyright © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Micelles

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Tandem multimer expression of angiotensin I-converting enzyme inhibitory peptide in Escherichia coli

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Biotechnology Journal 2009年第9期4卷 1345-1356页

作者： Fida, Hasan M. Kumada, Yoichi Terashima, Masaaki Katsuda, Tomohisa Katoh, Shigeo Department of Molecular Science and Material Engineering Graduate School of Science and Technology Faculty of Engineering Kobe Japan Department of Chemistry and Materials Technology Kyoto Institute of Technology Kyoto Japan Department of Biosphere Sciences School of Human Science Kobe College Nishinomiya Japan Department of Chemical Engineering Hanyang University 1271 Sa-3-dong Sangrok-gu Ansan 426-791 Korea Republic of Department of Process Engineering and Applied Science Food Science and Technology Program Dalhousie University 1360 Barrington Street Halifax NS B3J 2X4 Canada

It is common for small tandem peptide multimer genes to be indirectly inserted into expression vectors and fused with a protein tag. In this study, a multimer of the tandem angiotensin I-converting enzyme inhibitory peptide (ACE-IP) gene was directly transferred to a commercially available vector and the designed gene was expressed as a repeated peptide in Escherichia coli BL21(DE3)pLysS. The process further developed in our study was the construction of six-repeated ACE-IP synthetic genes and their direct insertion. Protein expression in inclusion bodies was confirmed by SDS-PAGE and Western blot. Acid hydrolysis of inclusion bodies produced single-unit peptides through cleavage of the aspartyl-prolyl bonds. This cleaved recombinant peptide (rACE-IP) was purified using immuno-affinity chromatography followed by reversed phase-HPLC. 105-115 mg of the lyophilized recombinant peptide was obtained from 1 L E. coli culture. In vitro biological activity of rACE-IP was indistinguishable from that of the natural peptide produced by hydrolysis in artificial gastric juice or by acidic hydrolysis. The rACE-IP prepared by recombinant DNA technology and solid-phase synthesis methods showed a similar IC50. This strategy could be used for the expression of important peptides, which have N-terminal proline (P) and C-terminal aspartic acid residues (D) for commercial applications, e.g. functional foods and drinks. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Peptides

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Unmasking a Third Polymorph of a Benchmark Crystal‐Structure‐Prediction Compound†

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Angewandte Chemie 2009年第45期121卷

作者： Saikat Roy Adam J. Matzger Department of Chemistry and the Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI 48109‐1055 (USA) Fax: (+1) 734‐615‐8853

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Mercury Biosensors: Polydiacetylene–Liposome Microarrays for Selective and Sensitive Mercury(II) Detection (Adv. Mater. 36/2009)

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Advanced materials 2009年第36期21卷

作者： Jiseok Lee Hayeon Jun Jinsang Kim Macromolecular Science and Engineering University of Michigan Ann Arbor MI 48109 (USA) Department of Material Science and Engineering University of Michigan Ann Arbor MI 48109 (USA) Chemical Engineering University of Michigan Ann Arbor MI 48109 (USA) Biomedical Engineering University of Michigan Ann Arbor MI 48109 (USA)

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Inside Cover: Multicompartmental Microcylinders (Angew. Chem. Int. Ed. 25/2009)

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Angewandte Chemie International Edition 2009年第25期48卷

作者： Srijanani Bhaskar Jonathon Hitt Sei-Won Laura Chang Joerg Lahann Prof. Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI 48109 (USA) Fax: (+1) 734-764-7453 Department of Chemical Engineering University of Michigan Ann Arbor MI 48109 (USA)

Multicompartmental microcylinders can be produced by a combination of electrohydrodynamic co-spinning and microsectioning, as described by J. Lahann et al. in their Communication on page 4589 ff. The number of individual compartments, relative compartment orientation, chemical composition and functionality, and aspect ratio can be precisely tuned. Each color in the longitudinal and cross-sectional micrograph images depicts an individual compartment.

关键词： anisotropy biodegradable polymers electrohydrodynamic co-spinning microparticles protein immobilization

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Multicompartmental Microcylinders†

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Angewandte Chemie 2009年第25期121卷

作者： Srijanani Bhaskar Jonathon Hitt Sei‐Won Laura Chang Joerg Lahann Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI 48109 (USA) Fax: (+1) 734‐764‐7453 Department of Chemical Engineering University of Michigan Ann Arbor MI 48109 (USA)

Farbenprächtige Säulen : Eine einfache und dabei skalierbare Methode zur Herstellung multikompartimentalisierter Mikrozylinder, bei denen innerer Aufbau, Seitenverhältnis und Oberfläche gezielt eingestellt werden können, nutzt elektrohydrodynamisches Spinnen und Mikroabtrennen. Die Kompartimente werden mithilfe verschiedenfarbiger Farbstoffe unterschieden (siehe CLSM‐Bilder; Maßstab: 10 μm).

关键词： Anisotropie Bioabbaubare Polymere Elektrohydrodynamisches Spinnen Mikropartikel Proteinimmobilisierung

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