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2006 MRS Fall Meeting

作者： Chevallier, Laure Di Bartolomeo, Elisabetta Traversa, Enrico Mori, Masami Sadaoka, Yoshihiko Dept. of Chemical Science and Technology University of Rome Tor Vergata via della Ricerca Scientifica 1 Rome I-00133 Italy Dept. of Materials Science and Biotechnology Graduate School of Science and Engineering Ehime University Bunkyo-cho Matsuyama 790-8577 Japan

ISBN: (纸本)1558999299

Electrochemical sensors for Volatile Organic Compound (VOCs) based on commercial YSZ layers were fabricated using Pt and SmFeO3 perovskite oxide as electrodes, both exposed to the same gas environment. Pt was sputtered on YSZ layers while SmFeO3 p-type semiconducting oxide was deposited by electrophoretic deposition (EPD). Nanometric SmFeO3 oxide powders were selected because they have already shown good sensing performance in semiconducting sensors for oxidizing gases such as NO2 and ozone, and reducing gases, such as VOCs, Potentiometric measurements were performed under exposure to different concentrations of VOCs such as: methyl ethyl ketone (MEK), ethanol (EtOH) and acetic acid (AA). The best gas sensing response was obtained at 400°C. © 2007 materials Research Society.

关键词： Volatile organic compounds

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Fracture induced by cold rolling in metal/polymer composites

Fracture induced by cold rolling in metal/polymer composites

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SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009

作者： Calcagno, Barbara O. Rinaldi, Carlos Osswald, Tim A. Crone, Wendy C. Materials Science Program University of Wisconsin Madison WI United States Chemical Engineering Dept. University of Puerto Rico-Mayaguez Puerto Rico Mechanical Engineering Dept. University of Wisconsin Madison WI United States Engineering Physics Dept. University of Wisconsin Madison WI United States

ISBN: (纸本)9781615671892

Metal inclusions in polymeric composites exhibit different fracture patterns under a process of calendering, i.e. cold rolling and folding. Combinations of NiTi and Ti inclusions were used in polypropylene, polycarbonate, and high density polyethylene. Fundamental aspects to the process of calendering/rolling dissimilar materials are the deformation and fracture behavior of constituents with different stiffness and fracture strength, the interface adhesion, the load transfer between composite constituents, and the pressure and shear stress profiles at the interface. Experiments were conducted to identify the process parameters required to induce fracture in the metal/alloy inclusion on the first rolling pass. Dimensional analysis showed a logarithmic relation between composite stretch and a dimensionless nip gap parameter related to the gap between the rollers. ©2009 Society for Experimental Mechanics Inc.

关键词： Binary alloys

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Environmentally benign materials for electronics;A review of current developments and emerging technologies

Environmentally benign materials for electronics;A review of...

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materials science and Technology 2005 Conference

作者： Lincoln, John D. Ogunseitan, Oladele A. Saphores, Jean-Daniel M. Schoenung, Julie M. Nixon, Hilary Shapiro, Andrew A. Dept. of Chemical Engineering and Materials Science University of California Irvine HSSOE Irvine CA 92697 Program in Industrial Ecology Dept. of Environmental Health Science and Policy UCI 92697-7070 Dept. of Planning Policy and Design UCI 218D SEI 92697-7075 Dept. of Chemical Engineering and Materials Science University of California 2017 Kemper Hall Davis 95616-5294 Jet Propulsion Laboratory 4800 Oak Grove Dr. Pasadena CA 91109

ISBN: (纸本)0873396456

materials used in handheld consumer electronic devices (CEDs), such as cell phones or PDAs, create environmental risks both during procurement and disposal. The increasing global demand for CEDs and recent legislative pressure motivate our review of alternative materials that could make CEDs more environmentally friendly. Hazardous materials considered include brominated flame retardants, lead-based solders, hexavalent chromium, copper, and ceramic materials. We survey recent research in the development of environmentally benign replacement materials, provide a brief assessment of the potential environmental, industrial, and economic consequences of their substitution, and assess progress in their industrial application. Identifying appropriate environmentally benign replacement materials provides a starting point for developing environmentally friendly CED prototypes.

关键词： Electronic equipment

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Two-stage electroactuation of partially neutralized hydrogels

Two-stage electroactuation of partially neutralized hydrogel...

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224th ACS National Meeting

作者： Rousseau, I.A. Mather, P.T. Polymer Program Institute of Materials Science University of Connecticut Storrs CT 06269-3136 United States Chemical Engineering Dept. University of Connecticut Storrs CT 06269-3136 United States

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Interfacial Roughness in GaAs/A1GaAs Multilayers: Influence of Controlled Impurity Addition

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MRS Online Proceedings Library 1994年第1期332卷 249-254页

作者： S. Nayak J. M. Redwing T. F. Kuech D. E. Savage M. G. Lagally Materials Science Program University of Wisconsin Madison USA Dept. of Chemical Engineering University of Wisconsin Madison USA

Impurities at heterointerfaces can alter the interfacial structure resulting in changes in physical, electrical and optical properties. We present a study of the interfacial roughness of GaAs/A1xGa1-xAs superlattices which were grown using controlled addition of oxygen at the interface. The interfacial properties were characterized by x-ray diffraction. The morphology of the surface was determined by Atomic Force Microscopy (AFM). X-ray diffraction measurements, both θ-2θ and rocking curves, were used to analyze the correlated and uncorrelated component of the interfacial roughness. A strong difference in the interfacial roughness was observed depending on whether the intentional oxygen incorporation occurred at the GaAs-to-A1GaAs interface or at both interfaces. When oxygen is incorporated at both interfaces, the x- ray reflectivity of the superlattice is decreased considerably resulting from a much higher interfacial roughness. The substrate miscut has a significant effect on RMS roughness, correlated roughness and its correlation length when oxygen is incorporated at the GaAs-to-A1xGa1-xAs interface.

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Electrical properties of lanthanum silicate apatite electrolytes prepared by an innovative chemical route

Electrical properties of lanthanum silicate apatite electrol...

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Symposium on Nanotechnology General Session - 225th ECS Meeting

作者： Macedo, G.L.S. Macedo, D.A. Rajesh, S. Martinelli, A.E. Figueiredo, F.M.L. Marques, F.M.B. Nascimento, R.M. Department of Chemical Engineering UFRN Natal59078-970 Brazil Department of Materials Engineering UFPB João Pessoa58051-900 Brazil Dept. of Materials and Ceramic Eng. CICECO University of Aveiro 3810-193 Portugal Materials Science and Engineering Postgraduate Program UFRN 59078-970 Brazil

ISBN: (纸本)9781607685869

This work reports the synthesis of apatite-type lanthanum silicate powders with nominal composition La10Si6O27 by an innovative chemical route which combines co-precipitation and sol-gel approaches. The herein proposed synthetic procedure is advantageous in reducing energy consumption and processing time, key elements to decrease the total manufacturing cost. The asprepared powder was calcined between 500 and 900 °C. Structure of the calcined powders, characterized by X-ray diffraction (XRD) and Rietveld refinement, indicated the formation of apatite crystalline lanthanum silicate with minor amount of L2O3 at 900 °C. The apatite powder was further analyzed by scanning electron microscopy (SEM). The effect of sintering temperature, ranging from 1400 to 1450 °C, on the electrical properties was investigated by impedance spectroscopy. Electrical measurements were recorded in the 400-800 °C temperature range. The lanthanum silicate electrolyte sintered at 1450 °C exhibited total electrical conductivity (σ700 °C = 2.12 × 10-3 ***-1) comparable with samples from literature prepared by sol-gel and freeze drying methods and sintered at 1500 °C. The results in the present study demonstrate that the co-precipitation method combined with a solgel approach is a promising alternative route to synthesize lanthanum silicate powders. © The Electrochemical Society.

关键词： Powders

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Techno-economic and life-cycle assessment of electrochemical captured CO2 conversion process in monoethanolamine

Techno-economic and life-cycle assessment of electrochemical...

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2022 AIChE Annual Meeting

作者： Lee, Suhyun Choi, Woong Kim, Jae Hyung Hwang, Yun Jeong Na, Jonggeol Ewha Womans University School of Chemical Engineering and Materials Science Korea Republic of Ewha Womans University Graduate program in System Health Science and Engineering Korea Republic of Clean Energy Research Center Korea Institute of Science and Technology Korea Republic of Seoul National University School of Chemistry Korea Republic of Korea Republic of Ewha Womans University Dept. of Chemical Engineering & Material science Advanced Manufacturing Systems Laboratory Korea Republic of

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Structure of AIN on Si (111) Deposited with Metal Organic Vapor Phase Epitaxy

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MRS Online Proceedings Library 2011年第1期537卷 1-6页

作者： Eric Rehder M. Zhou L. Zhang N. R. Perkins S. E. Babcock T. F. Kuech Materials Science Program University of Wisconsin-Madison Madison USA Dept. of Materials Science University of Wisconsin-Madison Madison USA Dept. of Chemical Engineering University of Wisconsin-Madison Madison USA

The surface morphology and structure of AIN deposited by metal organic vapor phase epitaxy (MOVPE) on Si (111) at growth temperatures ranging from 825 to 1175°C was investigated. Transmission electron microscopy (TEM), reflection high energy electron diffraction (RHEED), atomic force microscopy (AFM), and secondary ion mass spectrometry (SIMS) techniques were used to study the resulting film structure. Growth at high temperatures but less than ≈1100°C, resulted in a wire texture with some degree of in-plane alignment with (0001)AIN //(111)si, <101¯0>AIN //<2¯11>si, and <112¯0>AIN. // <1¯10>si. Deposition at temperatures greater than 1100°C results in single crystal films consisting of domains 60 nm across with an aspect ratio near unity. Growth below 1100°C leads to degraded crystal quality with the grains developing random rotational misalignments around the AIN [0001] axis. Growth at lower temperatures produces islands elongated along the [112¯0] direction. At the growth temperature of 825°C, the aspect ratio of the islands increased to 3 and a width of 25 nm. Cross -sectional TEM reveals that these islands are faceted due to slow growth on the {11¯01} planes.

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Lateral epitaxial overgrowth of InAs on (100) GaAs substrates

Lateral epitaxial overgrowth of InAs on (100) GaAs substrate...

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Quantum Confined Semiconductor Nanostructures

作者： Suryanarayanan, Ganesan Khandekar, Anish A. Hawkins, Brian E. Kuech, Thomas F. Babcock, Susan E. Materials Science Program University of Wisconsin-Madison Madison WI 53706 United States Department of Chemical Engineering University of Wisconsin-Madison Madison WI 53706 United States Dept. of Materials Science and Eng. University of Wisconsin-Madison Madison WI 53706 United States

The microstructure of epitaxial InAs thin films grown by MOCVD on mask-patterned "LEO" (lateral epitaxial overgrowth) GaAs and on unpatterned GaAs substrates was studied using double-crystal x-ray diffraction, scanning electron microscopy and cross-sectional transmission electron microscopy. This paper describes the improvement in crystal quality (factor of 20 reduction in x-ray rocking curve width), the order of magnitude reduction in dislocation density, and the rearrangement of the remaining extended defects that were observed in the LEO material when compared to the film grown on the unpatterned wafer.

关键词： Semiconducting indium compounds

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Potentiometric Detection of VOCs using Non-Nernstian SmFeO 3 /Pt/YSZ/Pt Sensors

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MRS Online Proceedings Library 2006年第1期972卷 1-6页

作者： Laure Chevallier Elisabetta Di Bartolomeo Enrico Traversa Masami Mori Yoshihiko Sadaoka Dept. of Chemical Science and Technology University of Rome Tor Vergata Rome Italy Dept. of Materials Science and Biotechnology Graduate School of Science and Engineering Ehime University Bunkyo-cho Matsuyama Japan

Electrochemical sensors for Volatile Organic Compound (VOCs) based on commercial YSZ layers were fabricated using Pt as reference electrode and SmFeO3 perovskite oxide as a sensing electrode, both exposed to the same gas environment. Pt was sputtered on YSZ layers while SmFeO3 p-type semiconducting oxide was deposited by electrophoretic deposition (EPD). Nanometric SmFeO3 oxide powders were selected because they have already shown good sensing performance in semiconducting sensors for oxidizing gases such as NO2 and ozone, and reducing gases, such as VOCs. Potentiometric measurements were performed under exposure to different concentrations of VOCs such as: methyl ethyl ketone (MEK), ethanol (EtOH) and acetic acid (AA). The best gas sensing response was obtained at 400°C.

关键词： sensor oxide electrical properties

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