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A Crystalline Mesoporous Coordination Copolymer with High Microporosity†

Angewandte Chemie 2008年第4期120卷

作者： Kyoungmoo Koh Antek G. Wong‐Foy Adam J. Matzger Department of Chemistry and the Macromolecular Science and Engineering Program University of Michigan 930 North University Ave Ann Arbor MI 48109‐1055 USA Fax: (+1) 734‐6715‐8853

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Erratum: “The scaling of zero-shear viscosities of semidilute polymer solutions with concentration” [J. Rheol. 49, 1117–1128 (2005)]

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Journal of Rheology 2007年第5期51卷 1099-1100页

作者： Youngsuk Heo Ronald G. Larson Macromolecular Science and Engineering Program University of Michigan Ann Arbor Michigan 48109 Department of Chemical Engineering and Macromolecular Science and Engineering Program University of Michigan Ann Arbor Michigan 48109

Page 1124. For three distinct polymer-solvent pairs, namely polystyrene in benzene, polyisoprene in cyclohexane, and polybutadiene in cyclohexane, we erroneousl

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Contributors to the Lab on a Chip cell and tissue engineering in microsystems special issue

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Lab on a Chip 2007年第6期7卷 667-671页

作者： Bhatia, Sangeeta N. Chen, Christoper Bashir, Rashid Beebe, David J. Desai, Tejal Gottwald, Eric Khademhosseini, Ali Langer, Robert S. Piel, Matthieu Takayama, Shuichi Thorsen, Todd Tien, Joe Voldman, Joel Vunjak-Novakovic, Gordana Wu, Mingming Yu, Hanry Massachusetts Institute of Technology Harvard-MIT Division of Health Sciences and Technology Department of Electrical Engineering and Computer Science United States Laboratory for Multiscale Regenerative Technologies United States Department of Innovation University of Pennsylvania Department of Bioengineering United States Cell Biology and Physiology Program Cell Growth and Cancer Program Tissue Microfabrication Laboratory Department of Electrical and Computer Engineering and Biomedical Engineering Purdue University United States Department of Electronics University of Glasgow United Kingdom Department of Physiology and Bioengineering University of California San Francisco CA United States California Institute for Quantitative Biomedical Research UCSF/UC Berkeley Graduate Group in Bioengineering United States Laboratory of Therapeutic Micro and Nanotechnology Institute for Biological Interfaces Germany 3D-Cell Culture Techniques Group Institute for Biological Interfaces Germany Department of Medicine and Health Sciences and Technology Massachusetts Institute of Technology (MIT) United States Institut Curie UMR 144 IC/CNRS France Biomedical Engineering Department University of Michigan United States Department of Biomedical Engineering Macromolecular Science and Engineering Program United States Sibley School of Mechanical and Aerospace Engineering School of Chemical and Molecular Engineering Cornell University United States National University of Singapore Singapore Institute of Bioengineering and Nanotechnology A STAR Singapore

A graphical abstract is available for this content

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DFT and Raman/UV-Vis-NIR spectroscopic study of fused α-oligothtophenes with five and seven rings in neutral and doped states

DFT and Raman/UV-Vis-NIR spectroscopic study of fused α-oli...

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Organic Optoelectronics and Photonics II

作者： Osuna, Reyes Malavé Ortiz, Rocío Ponce Delgado, Mari Carmen Ruiz Hernández, Víctor Navarrete, Juan Teodomiro López Zhang, Xinnan Matzger, Adam J. Department of Physical Chemistry University of Málaga 29071-Málaga Spain Department of Chemistry Macromolecular Science and Engineering Program University of Michigan 930 North University Ann Arbor MI 48109-1055 United States

ISBN: (纸本)0819462489

We report the characterization of novel oligothienoacenes with five and seven fused thiophene rings;materials with potential applications in organic electronics. The compounds were investigated, both in their neutral and doped forms, by UV-Vis-NIR and FT-Raman spectroscopies. Density functional theory (DFT) calculations have been also performed to assess information regarding the minimum-energy molecular structure, atomic charges distribution, topologies and energies of the frontier molecular orbitals (MOs) around the gap, vibrational normal modes related to the main Raman features, and vertical one-electron excitations giving rise to the main optical absorptions.

关键词： Raman spectroscopy

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Transport properties of proton exchange membranes

Transport properties of proton exchange membranes

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209th ECS Meeting

作者： Roy, Abhishek Hickner, Michael A. Lee, Hae-Seung Badami, Anand Yu, Xiang Li, Yanxiang Glass, Tom McGrath, James E. Macromolecular Science and Engineering Program Macromolecules and Interfaces Institute Virginia Polytechnic Institute and State University Blacksburg VA 24061 United States Chemical and Biological Systems Department Sandia National Laboratories Albuquerque NM 87185 United States

ISBN: (纸本)9781566775359

Disulfonated poly(arylene ether sulfone) random copolymers have shown promise as potential candidates for proton exchange membranes. The chemical structure of these copolymers has served as a basis for the molecular design of new random and multiblock copolymers. In random copolymers the sulfonic acid is distributed statistically, while in the multiblock copolymers the chemical structure is designed to have co continuous hydrophilic and hydrophobic domains. The effect of these variables on the transport properties of the membranes was investigated. For the random copolymers, high proton conductivity was observed at higher IEC along with high methanol permeability. But for the multiblock copolymers, it was possible to combine high proton conductivity with low methanol permeability. Improved proton conductivity was observed under partially hydrated conditions for samples with higher block lengths. Self diffusion coefficient of water was also measured by NMR which provided better understanding of the transport process. copyright The Electrochemical Society.

关键词： Proton exchange membrane fuel cells (PEMFC)

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Properties of the surface-modified layer of plasma-oxidized poly(dimethylsiloxane)

Properties of the surface-modified layer of plasma-oxidized ...

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2006 MRS Spring Meeting

作者： Mills, Kristen L. Zhu, Xiaoyue Lee, Donghee Takayama, Shuichi Thouless, M.D. Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 United States Department of Biomedical Engineering University of Michigan Ann Arbor MI 48109 United States Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI 48109 United States Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 United States

ISBN: (纸本)1558998810

Exposure of poly(dimethylsiloxane) (PDMS) to oxygen plasma creates a thin, stiff surface-modified layer that reaches a submicron depth. Due to a significant modulus mismatch between the stiff surface-modified layer and the compliant bulk PDMS the surface-modified layer forms intricate patterns of surface buckles when under compressive stress and nano-cracks when under tensile stress. It is desirable to be able to design patterns of nano-cracks, or at least to have an understanding of them. Among the properties necessary to do this are the thickness and elastic modulus of the surface-modified layer. Due to the very small length scale of the surface-modified layer, it is a significant challenge to measure these properties. In this proceedings paper, a two-step method is described for determining the thickness and elastic modulus of the surface-modified layer using the atomic force microscope (AFM). First, nanoindentation is performed from which the bending stiffness of the surface-modified layer is calculated. Second, the surface-modified layer thickness is determined by using phase imaging on the cross-section of oxidized PDMS to map the region of the relatively stiffer surface-modified layer. © 2006 Materials Research Society.

关键词： Silicones

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Properties of the surface-modified layer of plasma-oxidized poly(dimethylsiloxane)

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MRS Online Proceedings Library 2006年第1期924卷 1-6页

作者： Kristen L. Mills Xiaoyue Zhu Donghee Lee Shuichi Takayama M. D. Thouless Department of Mechanical Engineering University of Michigan Ann Arbor USA Department of Biomedical Engineering University of Michigan Ann Arbor USA Macromolecular Science and Engineering Program University of Michigan Ann Arbor USA Department of Materials Science and Engineering University of Michigan Ann Arbor USA

关键词： nanoscale elastic properties film

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Fluorescence lifetime imaging microscopy (FLIM) measures oxygen gradients in microfluidic bioreactors

Fluorescence lifetime imaging microscopy (FLIM) measures oxy...

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Biomedical Topical Meeting, BIO 2006

作者： Sud, Dhruv Mehta, Geeta Mehta, Khamir Linderman, Jennifer Takayama, Shuichi Mycek, Mary-Ann Dept. of Biomedical Engineering University of Michigan Ann Arbor MI 48109-2099 United States Dept. of Chemical Engineering University of Michigan Ann Arbor MI 48109-2099 United States Macromolecular Science and Engineering Program University of Michigan Ann Arbor MI 48109-2099 United States Applied Physics Program University of Michigan Ann Arbor MI 48109-2099 United States Comprehensive Cancer Center University of Michigan Ann Arbor MI 48109-2099 United States

A unique FLIM system was employed to quantitatively image extracellular oxygen distributions in perfused micro-bioreactors. We report effects of cell density on oxygen consumption and the first such measurement of oxy... 详细信息

ISBN: (纸本)1557528071

关键词： Oxygen

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Development of concentrated strain based deployable truss structures

Development of concentrated strain based deployable truss st...

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47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

作者： Pollard, Eric L. Murphey, Thomas W. Mejia-Ariza, Juan M. CSA Engineering Inc. Albuquerque NM 87123-3831 United States Air Force Research Laboratory Albuquerque NM 87117-5776 United States Virginia Polytechnic Institute and State University Blacksburg VA 24061-0344 United States CSA Engineering Inc. 1451 Innovation Pkwy Albuquerque NM 87123-3831 United States AIAA Space Vehicles Directorate 3550 Aberdeen Ave. SE Albuquerque NM 87117- 5776 United States Macromolecular Science and Engineering Program 2018 Hahn Hall Blacksburg VA 24061-0344 United States

ISBN: (纸本)1563478080

The objective of this research is lo develop a novel, deployable hierarchical truss architecture composed of extruded carbon liber reinforced plastic (CFRP) rod and shape memory alloy (SMA) flexure elements;this structural system is representative of a concentrated, material deformation based deployable architecture. The scope of this study encompasses applying fundamental principles of rational truss design, relevant to all deployable structures, first to prove the concept at the individual element level, then to design the packaging kinematics, and finally, evaluate and scale the global performance of the system. Aspects of the architecture for tackle to further develop the truss concept, including manufacturing technology, experimental analysis, and the deployment scheme, will be reported in manuscripts to appear. Technology addressed through this research is intended to foster and mature successive large, launch-packaged concentrated strain structures. Copyright © 2006 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Trusses

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Manufacture and experimental analysis of a concentrated strain based deployable truss structure

Manufacture and experimental analysis of a concentrated stra...

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47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

作者： Mejia-Ariza, Juan M. Murphey, Thomas W. Pollard, Eric L. Virginia Polytechnic Institute and State University Blacksbury VA 24061-0344 United States Air Force Research Laboratory Albuquerque NM 87117-5776 United States CSA Engineering Inc. Albuquerque NM 87123-3345 United States Macromolecular Science and Engineering Program 2018 Halm Hall Blacksburg VA 24061-0344 United States Space Vehicles Directorate 3550 Aberdeen Ave. SE Albuquerque NM 87117-5776 United States AIAA CSA Engineering Inc. 1600 Eubank Blvd. SE Albuquerque NM 87123-3345 United States

ISBN: (纸本)1563478080

A truss structure was built and tested to advance deployable structures technology based on the concentrated strain approach, In 3rd order hierarchy systems, this architecture has the potential to provide a 10 fold improvement in mass efficiency, and demonstrate a linear compaction ratio that is five times better than current technology. A 101.6 cm x 12.7 cm x 12.7 cm test article was fabricated, and a buckling test and analysis was performed. The total mass of the deployable truss structure was 28 grams. This structure was constructed of piecewise constant cross section elements. One of the components consisted of high-modulus pull-truded carbon fiber rods (CFRs) for the majority of the length, The other components were compliant flexure joints made of Nitinol NiTi, a shape memory alloy (SMA) capable of a repeatable superelastic strain of 5.0% at either boundary. The results of this research provide a contribution to the deployable structures science by improving the compaction ratio and the mass efficiency of deployable structures without decreasing the truss performance limits.

关键词： Trusses

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