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Advanced Metallization Conference 2010

作者： Haimson, S. Shacham-Diamand, Y. Horvitz, D. Rozenblat, A. Micron Israel Ltd. Qiryat-Gat 82109 Israel Material Science Program Tel Aviv University Tel Aviv 69978 Israel Electrical Engineering Tel Aviv University Tel Aviv 69978 Israel

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Mechanical interactions of mouse mammary gland cells with a three-dimensional matrix construct

Mechanical interactions of mouse mammary gland cells with a ...

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作者： Lopez-Garcia, M.D.C. Beebe, D.J. Crone, W.C. Material Science Program Wisconsin Institutes for Medical Research 1500 Engineering Dr Madison WI 53706 United States Department of Biomedical Engineering Wisconsin Institutes for Medical Research 1500 Engineering Dr Madison WI 53706 United States Department of Engineering Physics University of Wisconsin - Madison 1500 Engineering Dr Madison WI 53706 United States

ISBN: (纸本)9781617386909

One risk factor associated with breast cancer is tissue or mammographic density which is directly correlated with the stiffness of the tissue. We undertook a study of mammary gland cells and their interactions with the extracellular matrix in a microfluidic platform. Mammary gland cells were seeded within collagen gels inside microchannels, using concentrations of 1.3, 2, and 3 mg/mL, along with fluorescent beads to track strains in the gel. The cells and beads were observed via four-dimensional imaging, tracking X, Y, Z positions over a three to four hour time frame. Three-dimensional elastic theory for an isotropic material was employed to calculate the stress. The technique presented adds to the field of measuring cell generated stresses by providing the capability of measuring 3D stresses locally around the single cell and using physiologically relevant materials properties for analysis. © 2010 Society for Experimental Mechanics Inc.

关键词： Cytology

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NMR and Computational Studies of Ba 8 Ga 16 Sn 30 Clathrates

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MRS Online Proceedings Library 2010年第1期1267卷 1-6页

作者： Sergio Y. Rodriguez Xiang Zheng Joseph H. Ross Department of Physics and Astronomy Texas A&M University College Station U.S.A. Material Science and Engineering Program Texas A&M University College Station U.S.A.

We have synthesized type-VIII and type-I Ba8Ga16Sn30 clathrates by using different annealing treatments, confirmed with XRD and electron microprobe measurements. NMR lineshape measurements identified a broad resonance corresponding to first-order-shifted satellites. Simulations for the type I structure based on first principles calculations provided an excellent fit to the data, with the best agreement provided by the calculated lowest-energy configuration, having no Ga-Ga bonds. These results allow us to address local configurations within the random type-I alloy, as well as atomic displacements and bond-length distributions, which we compare to experiment.

关键词： clathrates thermoelectric simulation

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The Direct Asymmetric Vinylogous Aldol Reaction of Furanones with α‐Ketoesters: Access to Chiral γ‐Butenolides and Glycerol Derivatives†

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Angewandte Chemie 2011年第8期123卷

作者： Jie Luo Haifei Wang Xiao Han Li‐Wen Xu Jacek Kwiatkowski Kuo‐Wei Huang Yixin Lu Department of Chemistry & Medicinal Chemistry Program Life Sciences Institute National University of Singapore 3 Science Drive 3 Singapore 117543 (Singapore) Fax: (+65) 6779‐1691 Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education Hangzhou Normal University (P R China) KAUST Catalysis Center and Division of Chemical and Life Sciences and Engineering King Abdullah University of Science and Technology (Kingdom of Saudi Arabia)

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Fluorescence correlation spectroscopy in an optical trap

Fluorescence correlation spectroscopy in an optical trap

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作者： Hu, Y. Junio, J. Cheng, X. Ou-Yang, H.D. Physics Department Lehigh University 16 Memorial Drive East PA 18015 United States Material Science and Engineering Department Lehigh University 16 Memorial Drive East PA 18015 United States Bioengineering Program Lehigh University 16 Memorial Drive East PA 18015 United States

We have combined optical trapping and fluorescence correlation spectroscopy (FCS) to determine the trapping energy and concentration of nanoparticles in suspension by analyzing the elongated dwell time and enhanced co... 详细信息

ISBN: (纸本)9781557528902

关键词： Suspensions (fluids)

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Electrical and microstructural properties of N+ ion-implanted ZnO and ZnO:Ag thin films

Electrical and microstructural properties of N+ ion-implante...

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第六届国际氧化锌及相关材料研讨会

作者： Michelle Myers Michael Myers Chen-Fong Tsai Joon Hwan Lee Department of Electrical and Computer Engineering Texas A&M University College Station TX 77843-3128 USA Department of Nuclear Engineering Texas A&M University College Station TX 77843-3128 USA Material Science and Engineering Program Texas A&M University College Station TX 77843-3128 USA

A systematic study to investigate the effectiveness of ion implanted N+ as a dopant for ZnO and a co-dopant in silver doped ZnO (ZnO:Ag, SZO) thin films was performed. ZnO and SZO films were grown on sapphire (0001)

关键词： ZnO Electrical and microstructural properties of N ion-implanted ZnO and ZnO:Ag thin films

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Effect of organoclay on the physical properties of UV-curable coatings

Effect of organoclay on the physical properties of UV-curabl...

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作者： Inceoglu, Funda Dalgicdir, Cahit Menceloglu, Yusuf Z. Faculty of Engineering and Natural Sciences Material Science and Engineering Program Sabanci University 34956 Orhanli Tuzla Istanbul Turkey

ISBN: (纸本)9780841274488

The combination of UV-curing and nanocomposite technology has been studied to produce cost-effective coatings with superior physical and mechanical properties. The clay was modified with dimethyl dihydrogenated-tallow quaternary ammonium salt and made organophilic. The effect of the organoclay(2-10 phr) on curing rate, mechanical, thermal and physical properties of a urethane-acrylate coating has been determined. X-ray diffraction analysis, AFM, SEM and TEM images as well as the tensile properties of different formulations have confirmed the uniform distribution of organoclay in polymer matrix. At 3 phr organoclay addition, the UV-cured film exhibited the best mechanical performance due to the formation of both intercalated and exfoliated morphologies. Curing time was reduced and the initial thermal decomposition temperature shifted 50°C to higher temperature by the incorporation of small amount of organoclay. The nanocomposite coating was also found to be more resistant against scratching compared with clay-free coating. © 2009 American Chemical Society.

关键词： Cost effectiveness

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Carbon nanostructures as thermal field emitters for waste heat recovery

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Diamond and Related materials 2009年第2-3期18卷 563-566页

作者： Wong, Y.M. Kang, W.P. Davidson, J.L. Raina, S. Huang, J.H. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Program in Material Science Vanderbilt University Nashville TN 37235 United States Department of Materials Science and Engineering National Tsing Hua University Hsinchu 300 Taiwan

Traditional vacuum-based thermal energy conversion (VTEC) devices with "flat" metal emitters have been compromised by high working temperature mainly due to high work function and electron space charge effect. However, a VTEC system is inherently efficient due to unimpeded flow of electrons through vacuum and reduction of heat conduction by the vacuum medium. Consequently, VTEC devices are attractive in terms of space, weight and energy efficiency for waste heat recovery in a TEC system. Carbon nanostructured emitters including multiwalled carbon nanotubes (CNTs) and "ridge" nanodiamond thin films have shown relatively low threshold fields for electron field emission mainly due to their nanoscaled, high aspect ratio, emitting surfaces. In this study, the field-enhancing features of carbon nanostructures were investigated as thermal-field emitters for waste heat recovery. The turn-on field of CNTs was found to decrease from ~ 1.9V/μm at room temperature to ~ 0.9V/μm at 400°C. A high emission current of ~ 26μA was achieved at relatively low field of ~ 1.5V/μm and low temperature of 400°C. The maximum efficiency of the VTEC device is estimated to be ~ 15% at 300°C with a current density of 54mA/cm2. © 2008 Elsevier B.V.

关键词： Temperature

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Young's modulus of collagen as a function of displacement rate

Young's modulus of collagen as a function of displacement ra...

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SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009

作者： Lopez-Garcia, M.D.C. Beebe, D.J. Crone, W.C. Material Science Program University of Wisconsin Madison WI United States Biomedical Engineering University of Wisconsin Madison WI United States Engineering Physics University of Wisconsin Madison WI United States

ISBN: (纸本)9781615671892

Mammary gland cell behavior is affected by surrounding collagen density;in particular there is a link to breast cancer and tissue density. This motivates the need for determining Young's modulus of collagen at physiologically relevant displacement rates. The scale of movement for cells is on the order of 0.001 mm/min. The Young's modulus of collagen has been previously studied at the higher displacement rate of 10 mm/min. For cell studies these results may not be relevant since the Young's modulus is a function of displacement rate. We have obtained the Young's modulus for three displacement rates: 0.01, 0.1, and 1.0 mm/min;at three different collagen densities: 1.3 mg/mL, 2 mg/mL, and 3 mg/mL. In order to obtain accurate results, strain was measured directly from the sample using an optical technique. Also, it was shown that the strain rate that the samples experience is not the same as the strain rate calculated from the crosshead displacement. Sample strain rates as low as 0.0005 min-1 were achieved during the tensile testing. Young's modulus values ranged from 1 - 28 kPa for all the experimental results and below 7 kPa for tests conducted near 0.001 min-1. We conclude that it is essential that for collagen, the strain and strain rate be measured directly on the sample to obtain accurate Young's modulus results and strain rate values. It was confirmed that even at very low strain rates the stiffness of the sample increases with collagen density. ©2009 Society for Experimental Mechanics Inc.

关键词： Collagen

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Microstructural and pinning properties of YBa2Cu 307-δ thin films doped with magnetic nanoparticles

Microstructural and pinning properties of YBa2Cu 307-δ thin...

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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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