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作者： Guan, Fangxiao Yuan, Zhongzhe Wang, Jing Zhu, Lei Polymer Program Institute of Materials Science and Department of Chemical Materials and Biomolecular Engineering University of Connecticut Storrs CT 06269-3136 United States Department of Macromolecular Science and Engineering Case Western Reserve University Cleveland OH 44106-7202 United States

Although a high electric energy density was recently reported for defect-modified poly(vinylidene fluoride) (PVDF) copolymers at millisecond discharge, they usually deliver less energy at a high pulse rate. In this work, a low loss polystyrene (PS) was grafted as side chains onto the P(VDF-CTFE) main chain. After crystallization of PVDF, dielectric PS side chains were segregated to the crystalline-amorphous interface, forming a finite confinement dielectric layer for ferroelectric PVDF crystals. We speculated that less space charge was induced during electric poling because of the nanoscale confinement effect. Consequently, a fast discharge speed and a relatively high energy density were achieved. © 2010 American chemical Society.

关键词： Polystyrenes

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Using importance-performance analysis method to evaluate the fundamental chemistry competence in the universities of science and technology in Taiwan

Using importance-performance analysis method to evaluate the...

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2010 ASEE Annual Conference and Exposition

作者： Kuo, Kwannin Chen, Pao-Chi Hsu, Meei-Ruey Department of Chemical and Materials Engineering Lunghwa University of Science and Technology Taiwan College of Engineering Lunghwa University of Science and Technology Taiwan Department of Tourism Ming-Chuan University Taiwan TESOL Program Queen's University Belfast United Kingdom

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Platinum Concave Nanocubes with High‐Index Facets and Their Enhanced Activity for Oxygen Reduction Reaction†

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Angewandte Chemie 2011年第12期123卷

作者： Taekyung Yu Do Youb Kim Hui Zhang Younan Xia Department of Biomedical Engineering Washington University Saint Louis MO 63130 (USA) Department of Chemical and Biomolecular Engineering (BK21 graduate program) Korea Advanced Institute of Science and Technology (KAIST) 335 Gwahangro Yuseong‐gu Daejeon 305‐701 (Korea) State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering Zhejiang University Hangzhou Zhejiang 310027 (People's Republic of China)

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Corrigendum to “Coking behavior of a submicron MFI catalyst during ethanol dehydration to ethylene in a pilot-scale fixed-bed reactor” [Appl. Catal. A: Gen. 393 (2011) 161–170]

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Applied Catalysis A: General 2011年第1-2期398卷 195-195页

作者： Fei Wang Man Luo Wende Xiao Xiaowei Cheng Yingcai Long State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Department of Chemistry Fudan University Shanghai 200433 China

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Finite-temperature anisotropic elastic properties of Ni-Mn-In magnetic shape memory alloy

Finite-temperature anisotropic elastic properties of Ni-Mn-I...

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作者： Williams, Kristen S. Cagin, Tahir Materials Science and Engineering Graduate Program Texas A and M University College Station TX United States Department of Chemical Engineering Texas A and M University College Station TX United States

ISBN: (纸本)9781617822018

Designing magnetic shape memory materials with practicable engineering applications requires a thorough understanding of their electronic, magnetic, and mechanical properties. Experimental and computational studies on such materials provide differing perspectives on the same problems, with theoretical approaches offering fundamental insight into complex experimental phenomena. Many recent computational approaches have focused on first-principles calculations, all of which have been successful in reproducing ground-state structures and properties such as lattice parameters, magnetic moments, electronic density of states, and phonon dispersion curves. With all of these successes, however, such methods fail to include the effects of finite temperatures, effects which are critical in understanding how these properties couple to the experimentally-observed martensitic transformation. To this end, we apply the quasi-harmonic theory of lattice dynamics to predict the finite-temperature mechanical properties of Ni-Mn-In magnetic shape memory alloy. We employ first-principles calculations in which we include vibrational contributions to the free energy. By constructing a free energy surface in volume/temperature space, we are able to evaluate key thermodynamic properties such as entropy, enthalpy, and specific heat. We further report the elastic constants for the austenite and martensite phases and evaluate their role as a driving force for martensitic transformation. © 2010 materials Research Society.

关键词： Magnetic moments

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Two‐Dimensional molecular Porous Networks Formed by Trimesic Acid and 4,4′‐Bis(4‐pyridyl)biphenyl on Au(111) through Hierarchical Hydrogen Bonds: Structural Systematics and Control of Nanopore Size and Shape†

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Angewandte Chemie 2011年第33期123卷

作者： Hailin Liang Wei Sun Xin Jin Heng Li Jianlong Li Xinquan Hu Boon K. Teo Kai Wu BNLMS SKLSCUSS College of Chemistry and Molecular Engineering Peking University Beijing 100871 (China) Fax: (+86) 10‐6275‐4005 College of Chemical Engineering and Materials Science Zhejiang University of Technology Hangzhou Zhejiang (China) Department of Chemistry University of Illinois Chicago IL 60607 (USA)

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The optical dielectric function in monolithic BaxSr 1-xTiO3 films

The optical dielectric function in monolithic BaxSr 1-xTiO3 ...

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Symposium on Ferroelectricity and Piezoelectricity: materials, Devices, and Applications

作者： Bruzzese, D. Fahnestock, K.J. Schauer, C.L. Spanier, J.E. Weiss, C.V. Alpay, S.P. Cole, M.W. Sbrockey, N.M. Tompa, G.S. Department of Materials Science and Engineering Drexel University PA 19104 United States Materials Science and Engineering Program Department of Chemical Materials and Biomolecular Engineering University of Connecticut CT 06269 United States U. S. Army Research Laboratory Aberdeen Proving Grounds MD 20783 United States Structured Materials Industries Inc. Unit 102 201 Circle Drive North Piscataway NJ 08854 United States

We present the results of characterization and analysis of the optical dielectric function of monolithic BaxSr1-xTiO3 films prepared by metal-organic solution deposition (MOSD). Lorentz Oscillator + Drude parameters and band gap for selected compositions are determined from variable-angle spectroscopic ellipsometry. Variation of the complex optical dielectric function is seen, and the results suggest that spectroscopic ellipsometry can be an effective means of both ex situ analysis and in situ monitoring of film composition during other BST and related film material growth processes. Copyright © Taylor & Francis Group, LLC.

关键词： Film growth

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Design and simulation of tunable Ka band filters with graded barium strontium titanate (BST) varactors

Design and simulation of tunable Ka band filters with graded...

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Symposium on Ferroelectricity and Piezoelectricity: materials, Devices, and Applications

作者： Kalkur, T.S. Sbrockey, N.M. Tompa, G.S. Alpay, S.P. Department of Electrical and Computer Engineering University of Colorado at Colorado Springs Colorado Springs CO 80933-7150 United States Structured Materials Industries Inc. Unit 102 201 Circle Drive North Piscataway NJ 08854 United States Materials Science and Engineering Program Department of Chemical Materials and Biomolecular Engineering University of Connecticut Storrs CT 06269 United States

Tunable Ka band filters based on graded barium strontium titanate (BST) have been investigated in terms of their associated parasitics, tunability, and temperature dependence of capacitance. The simulation results show that increase in parasitic resistance from 0.05 ohm to 1 ohm increases the insertion loss from 0 db to 25 db. The simulation results also show that, with 60% tunability for graded BST capacitors, the center frequency of the filter can be tuned from 29.489 GHz to 45.144 GHz. In addition, the bandwidth shift becomes temperature independent when the graded BST capacitor is biased at an electric field of 3e7V/cm. Copyright © Taylor & Francis Group, LLC.

关键词： Barium strontium titanate

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Magnetochromatic Polydiacetylene by Incorporation of Fe3O4Nanoparticles†

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Angewandte Chemie 2011年第24期123卷

作者： Xuli Chen Li Li Xuemei Sun Yanping Liu Bin Luo Changchun Wang Yuping Bao Hong Xu Huisheng Peng Key Laboratory of Molecular Engineering of Polymers of Ministry of Education Department of Macromolecular Science Laboratory of Advanced Materials Fudan University Shanghai 200438 (China) Med‐X Research Institute Shanghai Jiao Tong University Shanghai 200030 (China) Department of Chemical and Biological Engineering The University of Alabama Tuscaloosa AL 35487 (USA)

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Epitaxial Phase Transformation between Cylindrical and Double Gyroid Mesophases

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MRS Online Proceedings Library (OPL) 2011年第1期856卷 BB2.3-BB2.3页

作者： Lei Zhu Lu Sun Jianjun Miao Li Cui Qing Ge Roderic P. Quirk Chenchen Xue Stephen Z. D. Cheng Benjamin S. Hsiao Carlos A. Avila-Orta Polymer Program Institute of Materials Science and Department of Chemical Engineering University of Connecticut Storrs CT 06269–3136 Maurice Morton Institute and Department of Polymer Science University of Akron Akron OH 44325 Chemistry Department State University of New York at Stony Brook Stony Brook NY 11794

Complex phase transformation between the hexagonal cylinder (Hex) and double gyroid (G) phases in a polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer was investigated using two-dimensional (2D) synchrotron small-angle X-ray scattering (SAXS), and transmission electron microscope (TEM). The PS-b-PEO sample contained a small population of another bicontinuous cubic phase having an Im3m symmetry. These two bicontinuous cubic phases (G and Im3m) had the same unit cell dimensions. Under a large-amplitude reciprocating shear, the bicontinuous cubic phases transformed into a “single-crystal”-like Hex phase. When annealed at 150 °C for 40 min, the Hex phase partially transformed into well-oriented twinned structures of the G and Im3m phases without significant loss of orientation in 2D SAXS measurements. Epitaxial phase transformation relationships between the Hex/G and Hex/ Im3m phases were identified. The mechanism of the Hex → G transformation was examined by TEM.

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