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Inside Cover: Out-of-Cell Oxygen Diffusivity Evaluation in Lithium–Air Batteries (ChemElectroChem 12/2014)

ChemElectroChem 2014年第12期1卷 2032-2032页

作者： Prof. Weidong He Xiaoning Wang Luhan Ye Yu Pan Yuanqiang Song Aifang Liu Wei Wang Hongping Zhang Hongxue Qi Ming Zhou Zhiguo Wang Kelvin H. L. Zhang James H. Dickerson School of Energy Science and Engineering University of Electronic Science and Technology (UESTC) Chengdu Sichuan 611731 (P. R. China) Interdisciplinary Program in Materials Science Vanderbilt University Nashville Tennessee 37234-0106 (USA) Vanderbilt Institute of Nanoscale Science and Engineering Vanderbilt University Nashville Tennessee 37234-0106 (USA) Shenzhen Key Laboratory for Advanced Materials Department Material Science and Engineering Shenzhen Graduate School Harbin Institute of Technology University Town Shenzhen 518055 (P. R. China) School of Materials Science and Engineering Southwest University of Science and Technology Mianyang Sichuan 621010 (P. R. China) Department of Chemistry The University of Hong Kong Pokfulam Road (Hong Kong) Department of Applied Physics University of Electronic Science and Technology of China Chengdu 610054 (P. R China) Department of Chemistry Chemistry Research Laboratory University of Oxford Mansfield Road Oxford OX1 3TA (UK) Department of Physics Brown University Providence RI 02912 (USA)

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Advanced Characterization Techniques for Nanoparticles for Cancer Research: Applications of SEM and NanoSIMS for Locating Au Nanoparticles in Cells

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materials Research Society symposia proceedings. materials Research Society 2013年第1期1569卷 157-163页

作者： Paul J Kempen Chuck Hitzman Laura S Sasportas Sanjiv S Gambhir Robert Sinclair Department of Material Science and Engineering Stanford University 496 Lomita Mall Stanford CA 94305-4034 U.S.A. Stanford Nanocharacterization Laboratory Stanford University 476 Lomita Mall Stanford CA 94305-4035 U.S.A. Molecular Imaging Program at Stanford Department of Radiology Stanford University 318 Campus Drive Stanford CA 94305-5427 U.S.A.

The ability of nano secondary ion mass spectrometry (NanoSIMS) to locate and analyze Raman active gold core nanoparticles (R-AuNPs) in a biological system is compared with the standard analysis using the scanning electron microscope (SEM). The same cell with R-AuNPs on and inside the macrophage was analyzed with both techniques to directly compare them. SEM analysis showed a large number of nanoparticles within the cell. Subsequent NanoSIMS analysis showed fewer R-AuNPs with lower spatial resolution. SEM was determined to be superior to NanoSIMS for the analysis of inorganic nanoparticles in complex biological systems.

关键词： scanning electron microscopy (SEM) secondary ion mass spectroscopy (SIMS) biological

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Characterization of Zirconia Nanoparticles Produced by Biomimetic Condensation

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Microscopy and Microanalysis 2012年第S2期18卷 1592-1593页

作者： Arellano-Jiménez, M. Josefina Hire, Chetan Adamson, Douglas Carter, C. Barry Department of Chemical Materials and Biomolecular Engineering University of Connecticut Storrs CT 06269 United States Polymer Program Institute of Material Science University of Connecticut Storrs CT 06269 United States Department of Chemistry Institute of Material Science University of Connecticut Storrs CT 06269 United States

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

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Reversible tuning of the electronic properties of graphene via controlled exposure to electron beam irradiation and annealing

Reversible tuning of the electronic properties of graphene v...

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2011 MRS Spring Meeting

作者： Teweldebrhan, Desalegne Liu, Guanxiong Balandin, Alexander A. Nano-Device Laboratory Bourne College of Engineering University of California - Riverside Riverside CA 92521 United States Material Science and Engineering Program University of California - Riverside Riverside CA 92521 United States

ISBN: (纸本)9781605113210

Graphene reveals many extraordinary properties including extremely high room temperature carrier mobility and intrinsic thermal conductivity. Understanding how to controllably modify graphene's properties is essential for its proposed applications. Here we report on a method for tuning the electrical properties of graphene via electron beam irradiation. It was observed that single-layer graphene is highly susceptible to the low-energy electron beams. We demonstrated that by controlling the irradiation dose one can change, by desired amount, the carrier mobility, shift the charge neutrality point, increase the resistance at the minimum conduction point, induce the "transport gap" and achieve current saturation in graphene. The change in graphene properties is due to defect formation on the graphene surface and in the graphene lattice. The changes are reversible by annealing until some critical irradiation dose is reached. © 2011 materials Research Society.

关键词： Graphene

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Metal Oxides as Catalyst Promoters for Methanol Oxidation

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MRS Online Proceedings Library (OPL) 2012年第1期1446卷 mrss12-1446-u09-36-mrss12-1446-u09-36页

作者： Praveen Kolla Kimberly Kerce Hao Fong Alevtina Smirnova Material Engineering Science Program South Dakota School of Mines and Technology Rapid City SD 57701 U.S.A. Department of Chemistry South Dakota School of Mines and Technology Rapid City SD 57701 U.S.A. Material Engineering Science Program

The Transition metal oxides such as TiO2 and CeO2 as catalyst and co-catalyst materials were studied for methanol oxidation. The metal oxide nanoparticles were impregnated into carbon aerogel and Pt-Ru/C (Tanaka) by modified sol-gel Pechini method and heat-treated at different temperatures. Crystal structure, particle size and composition of the catalyst particles were studied using XRD, TEM and EDS techniques. The electrochemical activity and stability of these catalyst materials were studied in acidic medium and the results were compared to their corresponding specific and active surface areas. The aerogel supported metal oxides were stable and proved for better methanol oxidation, while a significant synergetic effect in electro-oxidation is observed when the metal oxides were impregnated into the structure of Pt-Ru/C catalyst. The methanol-oxidation was further improved after heat treatment due to its improved structural and surface properties.

关键词： aerogel catalytic nanostructure

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Micro-patterned surface for efficient capturing of circulating tumor cells

Micro-patterned surface for efficient capturing of circulati...

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Annual Northeast Bioengineering Conference

作者： Antony Thomas Chi-mon Chen Shu Yang Xuanhong Chen Yaling Liu Bioengineering Program Lehigh University USA Material Science and Engineering University of Pennsylvania USA Material Science and Engineering Lehigh University USA Mechanical Engineering and Mechanics Lehigh University USA

This work aims to design, fabricate, and characterize a micro-patterned surface that will be integrated into microfluidic devices to enhance particle and rare cell capture efficiency. Capture of ultralow concentration of circulating tumor cells in a blood sample is of vital importance for early diagnostics of cancer diseases. Despite the significant progress achieved in development of cell capture techniques, the enhancement in capture efficiency is still limited and often accompanied with drawbacks such as low throughput, low selectivity, pre-diluting requirement, and cell viability issues. The goal of this work is to design a biomimetic surface that could significantly enhance particle/cell capture efficacy through computational modeling, surface patterning, and microfluidic integration and testing. A PDMS surface with microscale ripples is functionalized with epithelial cell adhesion molecule (EpCAM) antibody to capture prostate cancer PC3 cells. Our microfluidic chip with micropatterns has shown significantly higher cell capture efficiency and selectivity compared to the chips with plane surface or classical herringbone-grooves.

关键词： Surface waves Microfluidics Tumors Educational institutions USA Councils materials Testing

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Data transmission performance of few-layer graphene ribbons

Data transmission performance of few-layer graphene ribbons

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2011 MRS Spring Meeting

作者： Guvenc, Ali Bilge Lin, Jian Penchev, Miroslav Ozkan, Cengiz Ozkan, Mihrimah Department of Electrical Engineering University of California-Riverside Riverside CA 92521 United States Department of Mechanical Engineering University of California-Riverside Riverside CA 92521 United States Material Science and Engineering Program University of California-Riverside Riverside CA 92521 United States

ISBN: (纸本)9781605113210

We investigated the electrical characteristics and digital data transmission performance few-layer graphene ribbons grown by chemical vapor deposition. Graphene ribbons having a mobility of 2,180 cm2V -1s-1 can sustain data rates up to 50 megabits per second at 1.5 μm length, thus the bandwidth is inversely proportional to resistance caused by defects in the graphene layers. Improving the graphene mobility to highest measured values (∼200,000 cm2V-1s -1) and using structures with multiple coplanar transmission lines in parallel could carry the bandwidth beyond the gigabits per second level. © 2011 materials Research Society.

关键词： Bandwidth

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Comparative Analysis of the Surface Functionalization and Texturization of HDPE after H2 and O2 Ion Plasma Immersion

Comparative Analysis of the Surface Functionalization and Te...

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2012 International Conference on Environmental and materials engineering(EME 2012)

作者： Melissa Angelica C.Camacho Henry J.Ramos Material Science and Engineering Program College of ScienceUniversity of Philippines National Institute of Physics College of ScienceUniversity of Philippines

An in-house constructed Plasma Enhanced Chemical Vapor Deposition（PECVD）facility was used in this study to facilitate the surface chemistry improvement on High Density Polyethylene（HDPE）sheets and allow an increase in adhesion of copper thin films on HDPE *** material’s wet ability and polymer-metal adhesive strength are compared before and after plasma treatment to understand the creation and rearrangement of the functional groups present on the surface of H and O ion irradiated HDPE *** showed the detection of O-H,C≡C,C═C and C-O bonds on the surface of the irradiated samples.H ion irradiated sheets,however,showed no surface chemical functionality changes.

关键词： glow discharge plasma surface irradiation surface modification

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Effect of sintering temperature on microstructural properties of bioceramic bone scaffolds

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Next Generation Biomaterials and Surface Properties of Biomaterials Symposia - materials science and Technology 2011 Conference and Exhibition, MS and T 2011

作者： Vivanco, Juan Araneda, Aldo Ploeg, Heidi-Lynn Material Science Program University of Wisconsin-Madison Madison WI United States Department of Mechanical Engineering University of Wisconsin-Madison Madison WI United States Department of Industrial Engineering Universidad Técnica Federico Santa María Valparaiso Chile

ISBN: (纸本)9781118273326

Bioactive calcium phosphate (CaP) scaffolds have emerged as synthetic alternatives to bone grafts, acting to target serious fracture healing and bone disease such as osteoporosis. Previous research has shown that these bioceramic materials due to their osteoinductive and biocompatible properties can potentially induce bone formation from the surrounding native tissue. Sintering temperature of CaP scaffolds has been shown to influence the microstructure and properties;however, a comprehensive study to determine the influence of sintering temperature on CaP scaffolds has yet to be performed. Thus, the objective of this work was to determine the microstructural properties of an injection molded CaP scaffold based on the crystallographic phases and grain arrangement for different sintering temperatures. The CaP scaffolds were fabricated using tricalcium phosphate and sintered at three different target temperatures. The microstructural and mechanical properties were characterized by different techniques such as: X-ray diffraction, scanning electron microscopy with associated energy dispersive X-ray spectroscopy, and micro-hardness. It was found that grain size, degree of density, crystallite size, and microhardness increased with increasing sintering temperature;whereas, the crystallographic and the Ca/P atomic ratio did not vary for a sintering temperature range of 950-1150°C. These results support the design and fabrication of bioceramic scaffolds with controlled microstructural properties to provide structural integrity and encourage bone ingrowth.

关键词： Crystallite size

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Active Shape-Morphing Elastomeric Colloids in Short-Pitch Cholesteric Liquid Crystals

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Physical Review Letters 2013年第18期110卷 187802-187802页

作者： Julian S. Evans Yaoran Sun Bohdan Senyuk Patrick Keller Victor M. Pergamenshchik Taewoo Lee Ivan I. Smalyukh Department of Physics University of Colorado Boulder Colorado 80309 USA Centre for Optical and Electromagnetic Research Zhejiang University Hangzhou 310058 People’s Republic of China Institut Curie Centre de Recherche CNRS UMR 168 Université Pierre et Marie Curie 75248 Paris cedex 05 France Department of Chemistry and Biochemistry and Liquid Crystal Materials Research Center University of Colorado Boulder Colorado 80309 USA Institute of Physics Prospect Nauky 46 Kyiv 03039 Ukraine Material Science and Engineering Program Department of Electrical Computer & Energy Engineering and Liquid Crystal Materials Research Center University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA

Active elastomeric liquid crystal particles with initial cylindrical shapes are obtained by means of soft lithography and polymerization in a strong magnetic field. Gold nanocrystals infiltrated into these particles mediate energy transfer from laser light to heat, so that the inherent coupling between the temperature-dependent order and shape allows for dynamic morphing of these particles and well-controlled stable shapes. Continuous changes of particle shapes are followed by their spontaneous realignment and transformations of director structures in the surrounding cholesteric host, as well as locomotion in the case of a nonreciprocal shape morphing. These findings bridge the fields of liquid crystal solids and active colloids, may enable shape-controlled self-assembly of adaptive composites and light-driven micromachines, and can be understood by employing simple symmetry considerations along with electrostatic analogies.

关键词： LIQUID crystals PARTICLES SOFT lithography POLYMERIZATION MAGNETIC fields

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