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International Symposium on Fibers Interfacing the World 2013

作者： Zhao, Yong Lai, Chuilin Xi, Min Fong, Hao Department of Chemistry and Applied Biological Sciences South Dakota School of Mines and Technology Rapid City South Dakota57701-3995 United States Program of Materials Engineering and Science South Dakota School of Mines and Technology Rapid City South Dakota57701-3995 United States

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A low power miniaturized CMOS-based continuous glucose monitoring system

A low power miniaturized CMOS-based continuous glucose monit...

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2013 IEEE International Conference on Body Sensor Networks, BSN 2013

作者： Croce Jr., Robert A. Vaddiraju, Santhisagar Legassey, Allen Wang, Yan Burgess, Diane Papadimitrakopoulos, Fotios Jain, Faquir C. Biorasis Inc. Technology Incubation Program Storrs CT 06269 United States Department of Pharmaceutical Sciences University of Connecticut Storrs CT 06269 United States Dept. of Chemistry Institute of Materials Science University of Connecticut Storrs CT 06269 United States Department of Electrical and Computer Engineering University of Connecticut Storrs CT 06269 United States

ISBN: (纸本)9781479903306

This paper presents the design and fabrication of a highly-miniaturized system for continuous glucose monitoring which holds great promise for patients inflicted with diabetes mellitus. To achieve the realization of a truly implantable system, a variety of issues such as robust electrochemical sensor design, miniaturization of the electronic components and counteracting biofouling and negative tissue response need to be addressed. In this report, we present a highly-miniaturized transcutaneous continuous glucose monitoring system which holistically addresses the aforementioned tribulations associated with implantable devices. Specifically, a high performance amperometric electrochemical glucose sensor is integrated with custom designed complementary metal-oxide-semiconductor electronics. The fabricated electrochemical sensor is Clark-based, and employs stratification of five functional layers to achieve a linear response within the physiological range of glucose concentration (2-22 mM). Furthermore, the sensor is encased with a thick polyvinyl alcohol (PVA) hydrogel containing poly(lactic-co-glycolic acid) (PLGA) microspheres which provides continuous, localized delivery of dexamethasone utilized to combat inflammation and fibrosis. Such miniature size (0.665 mm2) and low power operation (140 μW) of the electronic system render it ideal for continuous glucose monitoring devices and other metabolic sensing systems. © 2013 IEEE.

关键词： CMOS integrated circuits

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Roles of organic acids during exectrooxidation reaction over Pt-supported carbon electrodes in direct methanol fuel cells

Roles of organic acids during exectrooxidation reaction over...

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作者： Wong, Chee Yong Chen, Shi-Kun Lo, An-Ya Tseng, Chuan-Ming Lin, Chiu-Yue Liu, Shang-Bin Department of Materials Science and Engineering Fong Chia University Taichung 40724 Taiwan Green Energy Development Center and Master's Program of Green Energy Science and Technology Fong Chia University Taichung 40724 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Department of Chemistry National Taiwan Normal University Taipei 11677 Taiwan

A comprehensive study has been made to explore the role of organic acids on electrocatalytic performances of platinum (Pt) nanoparticles supported on carbon porous materials (CPMs) in proton exchange membrane fuel cells (PEMFCs). In particular, the effects of carboxylic acids (R-COOH), viz. formic acid, acetic acid, propionic acid, and butyric acid on catalytic activity, stability, and durability of anodic Pt/CPM electrocatalyst in direct methanol fuel cells (DMFCs) were investigated. In the presence of doped carboxylic acids, the electrooxidative activity of Pt/CPM follows the trend: HCOOH 3COOH 2H5COOH 3H 7COOH, revealing a consistent increase in the severity of catalyst deactivation with the number of carbons on the alkyl chain of the dopant. The Pt/CPM was found to exhibit electrocatalytic performances and tolerance for poisoning than a commercial Pt/XC-72 catalyst with a similar Pt loading (20 wt%). Moreover, a notable increase in mass activity up to ca. 150% over the spent Pt/CPM catalyst was observed up on removing the organic acid in the feed stream, indicating that catalyst poisoning by deactivation may be revived, even to its "intrinsic" activity. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Electrocatalysts

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Processing and characterization of cyanate ester- MWNT nanocomposites 54

Processing and characterization of cyanate ester- MWNT nanoc...

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54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and materials Conference

作者： Lao, Si-Chon Moon, Tess J. Koo, Joseph H. Horváth, Zsolt E. Materials Science and Engineering Graduate Program University of Texas at Austin 204 E. Dean Keeton St./C2201 Austin TX 78712-0292 United States Department of Mechanical Engineering University of Texas at Austin 204 E. Dean Keeton St./C2200 Austin TX 78712-0292 United States Department of Mechanical Engineering Polymer Nanocomposites Technology Laboratory University of Texas at Austin 204 E. Dean Keeton St./C2200 Austin TX 78712-0292 United States Research Institute for Technical Physics and Materials Science Hungarian Academy of Sciences P.O. Box: 49 H-1525 Budapest Hungary

ISBN: (数字)9781624102233

ISBN: (纸本)9781624102233

In this study, a low viscosity, high performance cyanate ester (CE) resin system was used with non-functionalized and functionalized multiwall carbon nanotubes (MWNTs) to create cyanate ester-MWNT nanocomposites. Effects of three different standard functionalizations (i.e. -OH, -COOH, and -NH2) of MWNTs on their dispersion into the CE resin will be studied. Different mixing instruments, such as a high shear mixer, ultrasonicater, planetary mixer, etc. were used to disperse the nanotubes in the cyanate ester resin matrix. Several processing parameters were examined to produce optimal uniform dispersions of nanoparticles into the resin matrix. The parameters studied were mixing speed and duration, and the combination of different mixing techniques. Polymer nanocomposites (PNCs) morphological microstructures were characterized by transmission electron microscopy (TEM) and high resolution scanning electron microscopy (HR-SEM) to determine whether nanotubes are distributed uniformly within the polymer matrix. Thermogravimetric analysis (TGA) and microscale combustion calorimetry (MCC) were used to study the thermal stability and combustion characteristics of these nanocomposites. Dynamic mechanical thermal analysis (DMTA) was used to determine the glass transition temperature (T g) of the PNCs. © 2012 AIAA.

关键词： High resolution transmission electron microscopy

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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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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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Possible Kondo Physics near a Metal-Insulator Crossover in the A-Site Ordered Perovskite CaCu3Ir4O12

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Physical Review Letters 2013年第17期111卷 176403-176403页

作者： J.-G. Cheng J.-S. Zhou Y.-F Yang H. D. Zhou K. Matsubayashi Y. Uwatoko A. MacDonald J. B. Goodenough Materials Science and Engineering Program and Texas Materials Institute University of Texas at Austin Austin Texas 78712 USA Institute for Solid State Physics University of Tokyo Kashiwa 277-8581 Japan Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Department of Physics and Texas Materials Institute University of Texas at Austin Austin Texas 78712 USA

The A-site ordered perovskite (AA3′)B4O12 can accommodate transition metals on both A′ and B sites in the crystal structure. Because of this structural feature, it is possible to have narrow-band electrons interacting with broadband electrons from different sublattices. Here we report a new A-site ordered perovskite (CaCu3)Ir4O12 synthesized under high pressure. The coupling between localized spins on Cu2+ and itinerant electrons from the Ir-O sublattice makes Kondo-like physics take place at a temperature as high as 80 K. Results from the local density approximation calculation have confirmed the relevant band structure. The magnetization anomaly found at 80 K can be well rationalized by the two-fluid model.

关键词： METAL insulator semiconductors PEROVSKITE TRANSITION metals CRYSTAL structure ELECTRONS MAGNETIZATION

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Splicing Factor 3b Subunit 1 (SF3B1) mediates Mitochondrial Iron Overload In Myelodysplastic Syndromes With Ring Sideroblasts By Alternative Splicing Of Mitoferrin-1 (SLC25A37)

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BLOOD 2013年第21期122卷 1555-1555页

作者： Visconte, Valeria Mahfouz, Reda Z. Barnard, John Tabarroki, Ali Zhang, Li Hasrouni, Edy Rogers, Heesun J. Avishai, Nanthawan Cowen, Jonathan Sharghi-Moshtaghin, Reza Hitomi, Midori Lindner, Daniel Heuer, Arthur Lichtin, Alan E. Advani, Anjali S. Fibach, Eitan Rachmilewitz, Eli A. Kalaycio, Matt Sekeres, Mikkael A. Saunthararajah, Yogen Tiu, Ramon V. Department of Translational Hematology and Oncology Research Taussig Cancer Institute Cleveland Clinic Cleveland OH USA Department of Quantitative Health Sciences Cleveland Clinic Cleveland OH USA Division of Hematology and Medical Oncology Department of Medicine UCSF Helen Diller Family Comprehensive Cancer Center University of California San Francisco CA USA Department of Clinical Pathology Cleveland Clinic Cleveland OH USA Department of Materials Science and Engineering Swagelok Center for Surface Analysis of Materials Case Western Reserve University Cleveland OH USA Electron Microscopy Facility CWRU School of Medicine Cleveland OH USA Leukemia Program Department of Hematologic Oncology and Blood Disorders Taussig Cancer Institute Cleveland Clinic Cleveland OH USA Department of Hematology Hadassah-Hebrew University Medical Center Jerusalem Israel Department of Hematology The Edith Wolfson Medical Center Holon Israel

Splicing factor 3b subunit 1, SF3B1 contributes to the formation of ring sideroblasts (RS) in Myelodysplastic syndromes (MDS). Abnormalities in iron trafficking have been implicated in the pathogenesis of refractory anemia with RS (RARS) and RARS with thrombocytosis (RARS-T). In RARS/-T, light microscopy and traditional iron profiles do not accurately reflect intracellular iron status. SF3B1 mutant (MUT, n=25) and wild type (WT, n=8) RARS patients (pts) have no difference in iron profiles (ferritin (ng/mL): 1244 ng/mL ± 926 vs 1215 ± 1065; total iron binding capacity (ug/dL): 252 ± 80 vs 234 ± 50). We previously reported distinct differences in iron distribution between SF3B1 MUT and WT pts based on transmission electron microscopy (EM). Coarse iron deposits are present in the mitochondria of SF3B1 MUT while smaller iron deposits are found in WT. We hypothesized that SF3B1 mutations affect distinct downstream targets leading to the iron phenotype differences in MUT vs WT. To study these differences, we performed a series of EM, flow cytometric (FC) and RNA-sequencing experiments. Quantification of iron by scoring deposits of iron/grid showed higher amount of mitochondrial iron in MUT vs WT by EM. We used a FC based-approach to quantify the cytoplasmic and mitochondrial iron utilizing the properties of two cell-permeant compounds (calcein-AM and rhodamine-B) being retained in the cytoplasm and the mitochondria, respectively. In keeping with our EM studies, we found that SF3B1 MUT have a higher % of rhodamine-B+ cells compared to WT RARS pts and healthy subjects (77 vs 19 vs 0.87%; n=6) indicating that MUT accumulates more mitochondrial iron compared to WT. Cytoplasmic iron was not different between MUT and WT (57 vs 43%) but higher than healthy subjects (1.5%; p=0.02), suggesting that MUT store more mitochondrial iron compared to WT pts. Sf3b1+/- mice also showed higher iron stores in the mitochondria rather than in the cytosplasm (85 vs 16%; n=4). To understand the

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Radiative transport produced by oblique illumination of turbid media with collimated beams

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Physical Review E 2013年第6期87卷 063308-063308页

作者： Adam R. Gardner Arnold D. Kim Vasan Venugopalan Department of Chemical Engineering and Materials Science University of California Irvine Irvine California 92697 USA Laser Microbeam and Medical Program Beckman Laser Institute University of California Irvine Irvine California 92697 USA Applied Mathematics Unit School of Natural Sciences University of California Merced 5200 North Lake Road Merced California 95343 USA

We examine the general problem of light transport initiated by oblique illumination of a turbid medium with a collimated beam. This situation has direct relevance to the analysis of cloudy atmospheres, terrestrial surfaces, soft condensed matter, and biological tissues. We introduce a solution approach to the equation of radiative transfer that governs this problem, and develop a comprehensive spherical harmonics expansion method utilizing Fourier decomposition (SHEFN). The SHEFN approach enables the solution of problems lacking azimuthal symmetry and provides both the spatial and directional dependence of the radiance. We also introduce the method of sequential-order smoothing that enables the calculation of accurate solutions from the results of two sequential low-order approximations. We apply the SHEFN approach to determine the spatial and angular dependence of both internal and boundary radiances from strongly and weakly scattering turbid media. These solutions are validated using more costly Monte Carlo simulations and reveal important insights regarding the evolution of the radiant field generated by oblique collimated beams spanning ballistic and diffusely scattering regimes.

关键词： MONTE Carlo method COLLIMATED light TURBIDITY RADIATIVE transfer RADIATION OPTICAL properties

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A low power miniaturized CMOS-based continuous glucose monitoring system

A low power miniaturized CMOS-based continuous glucose monit...

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International Workshop on Wearable and Implantable Body Sensor Networks (BSN)

作者： Robert A. Croce Santhisagar Vaddiraju Allen Legassey Yan Wang Diane Burgess Fotios Papadimitrakopoulos Faquir C. Jain Biorasis Inc. Technology Incubation Program Storrs CT 06269 USA Technology Incubation Program Biorasis Inc. Storrs CT USA Department of Pharmaceutical Sciences University of Connecticut Storrs CT USA Polymer Program Department of Chemistry Institute of Materials Science University of Connecticut Storrs CT USA Department of Electrical and Computer Engineering University of Connecticut Storrs CT USA

ISBN: (纸本)9781479903313

This paper presents the design and fabrication of a highly-miniaturized system for continuous glucose monitoring which holds great promise for patients inflicted with diabetes mellitus. To achieve the realization of a truly implantable system, a variety of issues such as robust electrochemical sensor design, miniaturization of the electronic components and counteracting biofouling and negative tissue response need to be addressed. In this report, we present a highly-miniaturized transcutaneous continuous glucose monitoring system which holistically addresses the aforementioned tribulations associated with implantable devices. Specifically, a high performance amperometric electrochemical glucose sensor is integrated with custom designed complementary metal-oxide-semiconductor electronics. The fabricated electrochemical sensor is Clark-based, and employs stratification of five functional layers to achieve a linear response within the physiological range of glucose concentration (2–22 mM). Furthermore, the sensor is encased with a thick polyvinyl alcohol (PVA) hydrogel containing poly(lactic-co-glycolic acid) (PLGA) microspheres which provides continuous, localized delivery of dexamethasone utilized to combat inflammation and fibrosis. Such miniature size (0.665 mm 2 ) and low power operation (140 μW) of the electronic system render it ideal for continuous glucose monitoring devices and other metabolic sensing systems.

关键词： Sugar Monitoring CMOS integrated circuits Signal processing Electrodes Diabetes Sensors

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