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Experimental realization of crossover in shape and director field of nematic tactoids

Physical Review E 2015年第4期91卷 042507-042507页

作者： Vida Jamali Natnael Behabtu Bohdan Senyuk J. Alex Lee Ivan I. Smalyukh Paul van der Schoot Matteo Pasquali Department of Chemical and Biomolecular Engineering Rice University Houston Texas 77005 USA Department of Physics University of Colorado at Boulder Boulder Colorado 80309 USA Department of Electrical Computer and Energy Engineering and Materials Science and Engineering Program and Liquid Crystals Materials Research Center University of Colorado at Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA Polymer Physics Group for Theory of Polymers and Soft Matter Group Department of Applied Physics Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Institute for Theoretical Physics Utrecht University Leuvenlaan 4 3584 CE Utrecht The Netherlands Department of Chemistry Department of Materials Science and NanoEngineering The Smalley Institute for Nanoscale Science and Technology Rice University Houston Texas 77005 USA

Spindle-shaped nematic droplets (tactoids) form in solutions of rod-like molecules at the onset of the liquid crystalline phase. Their unique shape and internal structure result from the interplay of the elastic deformation of the nematic and anisotropic surface forces. The balance of these forces dictates that tactoids must display a continuous variation in aspect ratio and director-field configuration. Yet, such continuous transition has eluded observation for decades: tactoids have displayed either a bipolar configuration with particles aligned parallel to the droplet interface or a homogeneous configuration with particles aligned parallel to the long axis of the tactoid. Here, we report the first observation of the continuous transition in shape and director-field configuration of tactoids in true solutions of carbon nanotubes in chlorosulfonic acid. This observation is possible because the exceptional length of carbon nanotubes shifts the transition to a size range that can be visualized by optical microscopy. Polarization micrographs yield the interfacial and elastic properties of the system. Absorbance anisotropy measurements provide the highest nematic order parameter (S=0.79) measured to date for a nematic phase of carbon nanotubes at coexistence with its isotropic phase.

关键词： NEMATIC liquid crystals RESEARCH CARBON nanotubes ABSORBANCE (Light) CHLOROSULFONIC acid OPTICAL microscopes ELASTICITY

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Surface modification of halloysite for epoxy nanocomposite applications 72

Surface modification of halloysite for epoxy nanocomposite a...

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72nd Annual Technical Conference of the Society of Plastics Engineers: The Plastics Conference, ANTEC 2014

作者： Zeng, Songshan Reyes, Christopher Rodgers, Paul Wentworth, Samuel Sun, Luyi Department of Chemical and Biomolecular Engineering and Polymer Program Institute of Materials Science University of Connecticut StorrsCT06269 United States Department of Chemistry and Biochemistry Texas State University San MarcosTX78666-4684 United States

ISBN: (纸本)9781634397087

Polymer nanocomposites have been extensively investigated over the past two decades, resulting in a wide range of applications because of their excellent performance. Halloysite, a type of naturally occurring aluminosilicate, has attracted increasing interest in polymer nanocomposite applications, especially for the enhancement of mechanical properties owing the tubular structure of halloysite. Herein, we report a facile approach to achieve a high level of dispersion of halloysite nanotubes (HNTs) in epoxy by treating HNTs with a low concentration (0.015mol/L) of sodium hydroxide (NaOH). The NaOH treatment resulted in the formation of hydroxyl groups on the surface of HNTs, leading to a better dispersion of HNTs in polar solvent and epoxy matrix, which was verified by the Zeta potential characterization. Such a higher level of dispersion and strong interface helped enhance the modulus and fracture toughness of epoxy/HNT ( 5 phr HNT) by and 18% and 43%, respectively, in comparison to the neat epoxy. The dynamic mechanical analysis (DMA) revealed a 13% increment in the storage modulus of the composite at 50 °C. The SEM images of the fractured surfaces further confirmed the better dispersion of treated HNTs in the epoxy matrix, as opposed to the large agglomeration of untreated HNTs in the epoxy nanocomposite. Copyright © (2014) by the Society of Plastics Engineers All rights reserved.

关键词： Nanocomposites

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Corrigendum to “Elevated temperature nanoindentation characterization of poly( para -phenylene vinylene) conjugated polymer films” [Polym. Test. 41 (2015) 17–25]

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Polymer Testing 2015年 42卷 234-234页

作者： Nimitt G. Patel Arvind Sreeram Ramaswamy I. Venkatanarayanan Sitaraman Krishnan Philip A. Yuya Department of Mechanical and Aeronautical Engineering Clarkson University Potsdam NY 13699 USA Materials Science and Engineering PhD Program Clarkson University Potsdam NY 13699 USA Department of Chemical and Biomolecular Engineering Clarkson University Potsdam NY 13699 USA

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Synthesis, characterization of vanadia/titania-based catalysts and their performance in ammonia remediation

Synthesis, characterization of vanadia/titania-based catalys...

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Catalysis and Reaction engineering Division 2014 - Core programming Area at the 2014 AIChE Annual Meeting

作者： Chen, Hao Portela, Raquel Han, Wei Avila, Pedro Bañares, Miguel A. Yeung, King Lun Department of Chemical and Biomolecular Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Division of Environment Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Nano Science and Technology Program Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Instituto de Catalisis y Petroleoquimica CSIC Marie Curie 2 Madrid28049 Spain

ISBN: (纸本)9781510812529

Malodor is an important class of air pollution that poses a serious threat to personal health and quality of life. Ammonia gas is a major cause of malodor complaints and is produced by microbial decompositions of organic wastes. A catalyst capable of attaining better than 99 % conversion of 50 ppm NH3 in air at room temperature was successfully prepared. The EA of the reaction is dramatically decreased by using the catalysts when the ratio of VOx/TiOx increases. The NH3 was oxidized to nitrogen and water during the reaction without producing NOx. The catalyst was characterized by BET, micro-Raman and X-ray photoelectron spectroscopy to identify the active sites to be monomeric VOx on TiOx. © Copyright American Institute of Chemical Engineers. All rights reserved.

关键词： Ammonia

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HIERARCHICAL ANISOTROPIC BUCKLING OF POLYMER THIN FILMS

HIERARCHICAL ANISOTROPIC BUCKLING OF POLYMER THIN FILMS

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The 11th International Symposium on Polymer Physics(PP2014)(第十一届国际高分子物理学术讨论会)

作者： Dokyeong Kwon Hyunsik Yoon Kookheon Char The National Creative Research Initiative Center for Intelligent Hybrids1The WCU Program of Chemical Convergence for Energy & Environment School of Chemical & Biological Engineering Seoul National University Seoul 151-744Korea Department of Chemical & Biomolecular Engineering Seoul National University of Science & Technology Seoul 139-743Korea

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Hydrogels: Glacier Moraine Formation‐Mimicking Colloidal Particle Assembly in Microchanneled, Bioactive Hydrogel for Guided Vascular Network Construction (Adv. Healthcare Mater. 2/2015)

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Advanced Healthcare Materials 2015年第2期4卷

作者： Min Kyung Lee Max H. Rich Artem Shkumatov Jae Hyun Jeong Marni D. Boppart Rashid Bashir Martha U. Gillette Jonghwi Lee Hyunjoon Kong Department of Chemical and Biomolecular Engineering Institute of Genomic Biology University of Illinois at Urbana‐Champaign Urbana IL 61801 USA Department of Pathobiology University at Illinois at Urbana‐Champaign Urbana IL 61801 USA Department of Chemical Engineering Soongsil University Seoul 156–743 Korea Department of Kinesiology and Community Health University of Illinois at Urbana‐Champaign IL 61801 USA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana‐Champaign IL 61801 USA Department of Electrical and Computer Engineering & Bioengineering University of Illinois at Urbana‐Champaign IL 61801 USA Neuroscience Program Department of Cell and Developmental Biology University of Illinois at Urbana‐Champaign IL 61801 USA Department of Chemical Engineering and Materials Science Chung‐Ang University Seoul 156–756 Korea

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Thermoplastic elastomer systems for stimulated shape change: From electrical actuation to thermal recovery

Thermoplastic elastomer systems for stimulated shape change:...

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International Symposium on Fibers Interfacing the World 2013

作者： Spontak, Richard J. Tallury, Syamal S. Ghosh, Tushar K. Pasquinelli, Melissa A. Pourdeyhimi, Behnam Department of Chemical and Biomolecular Engineering NC State University United States Department of Materials Science and Engineering NC State University United States Fiber and Polymer Science Program NC State University United States Department of Textile Engineering Chemistry and Science NC State University United States

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Abstracts from the 8th International Conference on cGMP Generators, Effectors and Therapeutic Implications : Bamberg, Germany. 23-25 June, 2017

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BMC pharmacology & toxicology 2017年第SUPPL 1期18卷 64-64页

作者： Todd Milne, G. Sandner, Peter Lincoln, Kathleen A. Harrison, Paul C. Chen, Hongxing Wang, Hong Clifford, Holly Qian, Hu Sheng Wong, Diane Sarko, Chris Fryer, Ryan Richman, Jeremy Reinhart, Glenn A. Boustany, Carine M. Pullen, Steven S. Andresen, Henriette Moltzau, Lise Román Cataliotti, Alessandro Levy, Finn Olav Lukowski, Robert Frankenreiter, Sandra Friebe, Andreas Calamaras, Timothy Baumgartner, Robert McLaughlin, Angela Aronovitz, Mark Baur, Wendy Wang, Guang-Rong Kapur, Navin Karas, Richard Blanton, Robert Hell, Stefan Waldman, Scott A. Lin, Jieru E. Colon-Gonzalez, Francheska Kim, Gilbert W. Blomain, Erik S. Merlino, Dante Snook, Adam Erdmann, Jeanette Wobst, Jana Kessler, Thorsten Schunkert, Heribert Walter, Ulrich Pagel, Oliver Walter, Elena Gambaryan, Stepan Smolenski, Albert Jurk, Kerstin Zahedi, Rene Klinger, James R. Benza, Raymond L. Corris, Paul A. Langleben, David Naeije, Robert Simonneau, Gérald Meier, Christian Colorado, Pablo Chang, Mi Kyung Busse, Dennis Hoeper, Marius M. Masferrer, Jaime L. Jacobson, Sarah Liu, Guang Sarno, Renee Bernier, Sylvie Zhang, Ping Flores-Costa, Roger Currie, Mark Hall, Katherine Möhrle, Dorit Reimann, Katrin Wolter, Steffen Wolters, Markus Mergia, Evanthia Eichert, Nicole Geisler, Hyun-Soon Ruth, Peter Feil, Robert Zimmermann, Ulrike Koesling, Doris Knipper, Marlies Rüttiger, Lukas Tanaka, Yasutake Okamoto, Atsuko Nojiri, Takashi Kumazoe, Motofumi Tokudome, Takeshi Miura, Koichi Hino, Jun Hosoda, Hiroshi Miyazato, Mikiya Kangawa, Kenji Kapil, Vikas Ahluwalia, Amrita Paolocci, Nazareno Eaton, Philip Campbell, James C. Henning, Philipp Franz, Eugen Sankaran, Banumathi Herberg, Friedrich W. Kim, Choel Wittwer, M. Luo, Q. Kaila, V. Dames, S. A. Tobin, Andrew Alam, Mahmood Rudyk, Olena Krasemann, Susanne Hartmann, Kristin Prysyazhna, Oleksandra Zhang, Min Zhao, Lan Weiss, Astrid Schermuly, Ralph Moyes, Amie J. Chu, Sandy M. Baliga, Reshma S. Hobbs, Adrian J. Michalakis, Stylianos Mühlfriedel, Regine Schön, Christian Fischer, Dominik M. Wilhelm, Barbara Zobor, Ditta Kohl, Ironwood Pharmaceuticals Cambridge USA Bayer AG Drug Discovery - Cardiovascular Research Wuppertal Germany Department of Cardiometabolic Diseases Research Boehringer Ingelheim Pharmaceuticals Ridgefield USA Department of Small Molecule Drug Research Boehringer Ingelheim Pharmaceuticals Ridgefield USA Department of Pharmacology University of Oslo and Oslo University Hospital Oslo Norway Institute of Experimental Medical Research University of Oslo and Oslo University Hospital Oslo Norway Center for Heart Failure Research University of Oslo and Oslo University Hospital Oslo Norway Department of Pharmacology Toxicology and Clinical Pharmacy Institute of Pharmacy University of Tuebingen Tuebingen Germany Physiologisches Institut Universität Würzburg Würzburg Germany Molecular Cardiology Research Institute Tufts Medical Center Boston USA Present Affiliation: Division of Cardiology University of Pittsburgh Medical Center Pittsburgh USA Present Affiliation: Department of Medicine Brown University School of Medicine Providence USA Division of Cardiology Tufts Medical Center Boston USA Max Planck Institute for Biophysical Chemistry Göttingen and German Cancer Research Center (DKFZ) Heidelberg Germany Department of Pharmacology and Experimental Therapeutics Thomas Jefferson University Philadelphia USA Institut für Kardiogenetik and Universitäres Herzzentrum Lübeck Universität zu Lübeck Lübeck Germany & DZHK e.V. (German Center for Cardiovascular Research) Partner Site Hamburg/Kiel/Lübeck Lübeck Germany Deutsches Herzzentrum München Klinik für Herz- und Kreislauferkrankungen Technische Universität München Munich Germany Center for Thrombosis & Hemostasis Universitätsklinikum der Johannes Gutenberg-Universität Mainz Mainz Germany Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V Dortmund Germany Sechenov Institute of Evolutionary Physiology and Biochemistry Russian Academy of Sciences St. Petersburg Russia UCD Conway Institute UCD School of Medicine

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Pueraria lobata (Kudzu) photosystem i improves the photoelectrochemical performance of silicon

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Industrial Biotechnology 2013年第1期9卷 37-41页

作者： Gunther, Darlene Leblanc, Gabriel Cliffel, David E. Kane Jennings, G. Interdisciplinary Materials Science Graduate Program Vanderbilt University Nashville TN United States Department of Chemistry Vanderbilt University Nashville TN United States Department of Chemical and Biomolecular Engineering Vanderbilt University 2301 Vanderbilt Place Nashville TN 37235 United States

Photosystem I (PSI), a protein complex found within the thylakoid membrane of green plants and some bacteria, drives nature's 90-terawatt solar energy conversion process known as photosynthesis. Kudzu (Pueraria lobata) is an invasive vine from eastern Asia that grows in the southern United States, spreading at ∼500 km2 per year and causing extensive environmental damage. This article reports the first integration of nature's optimized solar energy converter-PSI from the fast-growing, invasive leaves of kudzu-with the ubiquitous platform of integrated circuits-silicon-to prepare a "wet" photoelectrochemical cell. Herein, we report on the success of PSI films extracted from the kudzu leaf and deposited on boron-doped silicon (p-Si) to enhance photoelectrochemical current over p-Si alone. © 2013, Mary Ann Liebert, Inc.

关键词： Solar energy

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High Speed Magnetic Tweezers at 10,000fps with Reflected Hg-Lamp Illumination

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2012 Annual Conference on Experimental and Applied Mechanics

作者： Lansdorp, Bob M. Saleh, Omar A. Materials Department University of California Santa Barbara Santa Barbara CA 93106 United States Materials Department and Biomolecular Science and Engineering Program University of California Santa Barbara Santa Barbara CA 93106 United States

ISBN: (纸本)9781461444350

The magnetic tweezer is a simple and stable single-molecule manipulation instrument. However, the standard probe-tracking methods have typically failed to reach the high resolution (∼0.3 nm) needed to measure motor protein stepping. In this paper we present a novel illumination geometry, based on an inverted microscope with Hg lamp illumination, that aims to push the resolution of magnetic tweezers to their ultimate thermal limits. Using a metal-coated coverslip and motorized magnets, we convert a standard inverted microscope into a high-resolution magnetic tweezers instrument. Our novel optical geometry reduces the restrictions on magnet design inherent to transmission-based illumination, and does not require fiber-optic coupling. We introduce a high-speed CMOS camera as the optical detector, and demonstrate how an improvement in temporal resolution directly impacts the spatial resolution. © The Society for Experimental Mechanics, Inc. 2013.

关键词： Magnets

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