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Rotational and translational diffusion of anisotropic gold nanoparticles in liquid crystals controlled by varying surface anchoring

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Physical Review E 2013年第6期88卷 062507-062507页

作者： Bohdan Senyuk David Glugla Ivan I. Smalyukh Department of Physics University of Colorado at Boulder Boulder Colorado 80309 USA Department of Electrical Computer and Energy Engineering University of Colorado at Boulder Boulder Colorado 80309 USA Liquid Crystals Materials Research Center and Materials Science and Engineering Program University of Colorado at Boulder Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado at Boulder Boulder Colorado 80309 USA

We study translational and rotational diffusion of anisotropic gold nanoparticles (NPs) dispersed in the bulk of a nematic liquid crystal fluid host. Experimental data reveal strong anisotropy of translational diffusion with respect to the uniform far-field director, which is dependent on shape and surface functionalization of colloids as well as on their ground-state alignment. For example, elongated NPs aligned parallel to the far-field director translationally diffuse more rapidly along the director whereas diffusion of NPs oriented normal to the director is faster in the direction perpendicular to it while they are also undergoing elasticity-constrained rotational diffusion. To understand physical origins of these rich diffusion properties of anisotropic nanocolloids in uniaxially anisotropic nematic fluid media, we compare them to diffusion of prolate and oblate ellipsoidal particles in isotropic fluids as well as to diffusion of shape-isotropic particles in nematic fluids. We also show that surface functionalization of NPs with photosensitive azobenzene groups allows for in situ control of their diffusivity through trans-cis isomerization that changes surface anchoring.

关键词： ANISOTROPY GOLD nanoparticles ROTATIONAL diffusion COLLOIDAL dispersions NEMATIC liquid crystals COLLOIDS AZOBENZENE

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Self-Oscillating Structural Polymer Gels

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Advances in Nanoparticles 2013年第2期2卷 94-98页

作者： Srinivasa R. Pullela Qingsheng Wang Zhengdong Cheng Artie McFerrin Department of Chemical Engineering Texas A&M University College Station USA Artie McFerrin Department of Chemical Engineering Texas A&M University College Station USA Materials Science and Engineering Program Texas A&M University College Station USA Department of Fire Protection & Safety Oklahoma State University Stillwater USA School of Chemical Engineering Oklahoma State University Stillwater USA

self-oscillating polymer gel has become a distinguished class of smart soft materials. Here we fabricated and demonstrated a self-oscillating structural gel network with the incorporation of the Belousov-Zhabotinsky (BZ) reaction. The structural polymer gel oscillates at a macroscopic level with remarkably faster kinetics compared to a normal gel of similar chemical compositions. The structural polymer gel also displays larger oscillating amplitude compared to the normal gel because of the increased diffusion of fluids surrounding the gel particles. This type of structural polymer gels can be harnessed to provide novel and feasible applications in a wide variety of fields, such as drug delivery, nanopatterning, chemical and biosensing, and photonic crystals.

关键词： Structural Gel Belousov-Zhabotinsky Reaction Self-Oscillation Poly-(N-isopropylacrylamide) Fast Response

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Propagation of Rarefaction Pulses in Discrete materials with Strain-Softening Behavior

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Physical Review Letters 2013年第14期110卷 144101-144101页

作者： E. B. Herbold V. F. Nesterenko Lawrence Livermore National Laboratory L-286 P.O. Box 808 Livermore California 94550 USA Department of Mechanical and Aerospace Engineering University of California at San Diego La Jolla California 92093-0411 USA Materials Science and Engineering Program University of California at San Diego La Jolla California 92093-0418 USA

We report on the dynamic behavior of strongly nonlinear discrete materials with anomalous strain-softening behavior. Rarefaction solitary waves found in numerical calculations agree well with the exact solution to the continuum wave equation. Compression pulses generated by impact quickly disintegrate into a leading rarefaction solitary wave followed by an oscillatory wave train containing localized excitations. Such behavior is favorable for metamaterials design of shock absorption layers as well as tunable information transmission lines for scrambling of acoustic information.

关键词： SOLITONS WAVE equation OSCILLATING chemical reactions ELECTRIC lines AUDITORY adaptation

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Photonic crystal biosensor with in-situ synthesized DNA probes for enhanced sensitivity

Photonic crystal biosensor with in-situ synthesized DNA prob...

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IEEE Photonics Conference (IPC)

作者： S. Hu Y. Zhao S. T. Retterer I. I. Kravchenko S. M. Weiss Department of Physics and Astronomy Vanderbilt University Nashville TN USA Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN USA Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

We report on a nearly 8-fold increase in multi-hole defect photonic crystal biosensor response by incorporating insitu synthesis of DNA probes, as compared to the conventional functionalization method employing pre-sy... 详细信息

关键词： Probes Biosensors Photonic crystals DNA Optical surface waves Magnetohydrodynamics Silicon

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Nanotechnology enabled drug delivery systems for bone and cartilage regeneration

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Recent Patents on Biomedical engineering 2012年第1期5卷 51-56页

作者： Lock, Jaclyn Liu, Huinan Department of Bioengineering Materials Science and Engineering Program University of California Riverside Riverside CA 92521 United States

Current advancement in nanotechnology created novel solutions to improve drug delivery and enhance the efficacy of therapeutics for tissue regeneration and disease treatment. Nanomaterials can be designed and fabricated to have biomimetic characteristics and unique properties for controlling cellular functions (e.g. cell adhesion and stem cell differentiation) and delivering therapeutics more effectively. Different nanomaterials, including nanoparticles, nanofibers, nanospheres, and nanocomposites, are highlighted with key examples of in vitro and in vivo work. Specifically for bone regeneration, the use of nano-phase hydroxyapatite has received increased interest as it is naturally present in bone and has osteoinductive properties. Additionally, the use of nanotubes and nanofibers loaded with chondroprotective agents are utilized for cartilage regeneration. In addition to scaffold design, the use of different drugs (e.g. antibiotics, peptides, proteins, and growth factors) and their delivery rate are discussed. This review focuses on nanotechnology enabled innovative patents for targeted drug delivery to specific tissues (i.e. bone and cartilage) and prolonged multi-phase drug release. © 2012 Bentham science Publishers.

关键词： Tissue regeneration

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Nanoinformatics workshop report: Current resources, community needs and the proposal of a collaborative framework for data sharing and information integration

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Computational science and Discovery 2013年第1期6卷 14008页

作者： Harper, Stacey L. Hutchison, James E. Baker, Nathan Ostraat, Michele Tinkle, Sally Steevens, Jeffrey Hoover, Mark D. Adamick, Jessica Rajan, Krishna Gaheen, Sharon Cohen, Yoram Nel, Andre Cachau, Raul E. Tuominen, Mark Department of Environmental and Molecular Toxicology Oregon State University Corvallis OR United States School of Chemical Biological and Environmental Engineering Oregon State University Corvallis OR United States Department of Chemistry University of Oregon Eugene OR United States Pacific Northwest National Laboratory Richland WA United States RTI International Research Triangle Park NC United States Science and Technology Policy Institute Washington DC United States US Army Engineer Research and Development Center Vicksburg MS United States National Institute for Occupational Safety and Health Morgantown WV United States University Libraries University of Michigan Amherst MA United States Department of Materials Science and Engineering Iowa State University Ames IA United States SAIC Frederick Frederick MD United States Department of Chemical and Biomolecular Engineering University of California Los Angeles CA United States Center for Environmental Implications of Nanotechnology University of California Los Angeles CA United States Advanced Biomedical Computer Center Information Systems Program Frederick National Laboratory for Cancer Research Frederick MD United States Physics Department University of Massachusetts Amherst MA United States

The quantity of information on nanomaterial properties and behavior continues to grow rapidly. Without a concerted effort to collect, organize and mine disparate information coming out of current research efforts, the value and effective use of this information will be limited at best. Data will not be translated to knowledge. At worst, erroneous conclusions will be drawn and future research may be misdirected. Nanoinformatics can be a powerful approach to enhance the value of global information in nanoscience and nanotechnology. Much progress has been made through grassroots efforts in nanoinformatics resulting in a multitude of resources and tools for nanoscience researchers. In 2012, the nanoinformatics community believed it was important to critically evaluate and refine currently available nanoinformatics approaches in order to best inform the science and support the future of predictive nanotechnology. The Greener Nano 2012: Nanoinformatics Tools and Resources Workshop brought together informatics groups with materials scientists active in nanoscience research to evaluate and reflect on the tools and resources that have recently emerged in support of predictive nanotechnology. The workshop goals were to establish a better understanding of current nanoinformatics approaches and to clearly define immediate and projected informatics infrastructure needs of the nanotechnology community. The theme of nanotechnology environmental health and safety (nanoEHS) was used to provide real-world, concrete examples on how informatics can be utilized to advance our knowledge and guide nanoscience. The benefit here is that the same properties that impact the performance of products could also be the properties that inform EHS. From a decision management standpoint, the dual use of such data should be considered a priority. Key outcomes include a proposed collaborative framework for data collection, data sharing and information integration. © 2013 IOP Publishing Ltd.

关键词： Data integration

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Graphene-like nanostructures obtained from Biomass

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MRS Online Proceedings Library 2013年第1期1505卷 1-6页

作者： Borin Barin, Gabriela Honorato Santos, Yane Alves Rocha, Jennyfer Pereira da Costa, Luiz Gomes Souza Filho, Antônio de Fátima Gimenez, Iara Silva Barreto, Ledjane Pos-graduation Program of Science and Materials Engineering Federal University of Sergipe São Cristóvão Brazil Department of Chemistry Federal University of Sergipe São Cristóvão Brazil Pos Graduation Program of Industrial Biotechnology Tiradentes University Aracaju Brazil Department of Physic Federal University of Ceara Ceará USA

Two dimensional (2D) carbon nanomaterials such as few graphite layers or graphene are extensively studied due to their unique properties suitable to be exploiting in a wide range of technological applications. Recently, the growth of high quality graphene monolayers using insects and waste as carbon precursors was reported in the literature. This methodology opened a new way to convert the waste carbon into a high-value-added product. In the present work coconut coir dust, an agroindustrial biomass, was used as biotemplate for preparing carbonaceous materials. Carbon structures were synthesized through pyrolysis under nitrogen atmosphere (100mL/min) at 500, 1000, and 1500°C during 2 hours. Starting materials were coconut coir dust in natura and coconut coir dust hydrothermally treated. The samples were characterized by X-ray diffraction, Raman Spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Raman spectra showed the D band for all samples, related to the presence of defects in sp2 carbon structure and G band, indicative of graphite crystallites. It was also observed that the sample carbonized at 1500°C from coconut coir dust treated by hydrothermal method showed G’ band at 2685cm-1 associated with the stacking order along the c-axis. X-ray diffraction analysis showed a broad peak around 2θ= 22° related to the presence of amorphous carbon. By increasing the pyrolysis temperature changes in XRD diffractograms were observed and the sample which was pyrolysed at 1500°C from coconut coir dust hydrothermally treated showed peaks at 2θ= 26.5°, 43° e 45° assigned to (002), (100) (101) graphite plans, respectively. Scanning electron microscopy images showed the presence of overlapping sheets and plates. Transmission Electron Microscopy (TEM) images of coconut coir dust in natura unveiled the formation of amorphous sheet. Coconut coir dust in natura and treated by the hydrothermal method pyrolysed at 1500°C, lead to the formation of

关键词： carbonization hydrothermal nanostructure

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AZIDE-ALKYNE CLICK POLYMERIZATION:AN UPDATE

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Chinese Journal of Polymer science 2012年第1期30卷 1-15页

作者： Hong-kun Li Jing-zhi Sun An-jun Qin Ben Zhong Tang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Department of Chemistry Institute of Molecular Functional Materials The Hong Kong University of Science ＆ Technology Clear Water Bay Kowloon Hong Kong China

The great achievements of click chemistry have encouraged polymer scientists to use this reaction in their field. This review assembles an update of the advances of using azide-alkyne click polymerization to prepare functional polytriazoles（PTAs） with linear and hyperbranched *** Cu（I）-mediated click polymerization furnishes 1,4-regioregular PTAs,whereas,the metal-free click polymerization of propiolates and azides produces PTAs with 1,4-regioisomer contents up to 90%.The PTAs display advanced functions,such as aggregation-induced emission,thermal stability,biocompatibility and optical nonlinearity.

关键词： Click polymerization Azide Alkyne Polytriazole Functionality

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SYNTHESIS AND CHARACTERIZATION OF Fe(Ⅱ-COORDINATED PS-b-P[NIPAM-co-(VBC-Fe-DMAP)]BLOCK COPOLYMERS

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Chinese Journal of Polymer science 2012年第5期30卷 674-681页

作者： Kai Cao 徐君庭王晓松 Department of Materials Science and Engineering East China University of Science and TechnologyShanghai200237China MOE key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou310027China Department of Chemistry Waterloo Institute of NanotechnologyUniversity of Waterloo200 University Avenue WestWaterlooONN2L 3G1Canada

In this work, a new type of block polymers, polystyrene-b-poly[（N-isopropyl acrylamide）-co-（vinyl benzyl chloride）] （PS-b-P（NIPAM-co-VBC））, was prepared via reversible addition fragmentation transfer polymerization, then pentacyano（4-（dimethylamino pyridine））ferrate （Fe-DMAP） was attached to VBC units through a quatemization process. The Fe（II）-coordinated PS-b-P[NIPAM-co-（VBC-Fe-DMAP）] block copolymers were characterized by 1H-NMR, FT-IR and TGA. The self-assembly behavior of the block copolymers was also investigated and the micelle morphology was characterized by TEM. It was found that the PS-b-P（NIPAM-co-VBC） block polymer and Fe-coordinated block copolymer could both form spherical micelles in DMF/MeOH mixed solvent.

关键词： Micelle Block copolymer Metallic organic polymer.

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Electrodes: Lithium Intercalation Behavior in Multilayer Silicon Electrodes (Adv. Energy Mater. 7/2014)

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Advanced Energy materials 2014年第7期4卷

作者： Tim T. Fister Jennifer Esbenshade Xiao Chen Brandon R. Long Bing Shi Christian M. Schlepütz Andrew A. Gewirth Michael J. Bedzyk Paul Fenter Chemical Sciences and Engineering Division Argonne National Laboratory Argonne IL 60439 USA Department of Chemistry University of Illinois Urbana‐Champaign Urbana IL 61801 USA Graduate Program in Applied Physics Northwestern University Evanston IL USA Advanced Photon Source Argonne National Laboratory Argonne IL 60439 USA Departments of Materials Science & Engineering and Physics & Astronomy Northwestern University Evanston IL 60208 USA

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