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Cholesteric Liquid Crystals with a Broad Light Reflection Band

Michel Mitov2012-10-23Advanced Materials

The cholesteric-liquid-crystalline structure, which concerns the organization of chromatin, collagen, chitin, or cellulose, is omnipresent in living matter. In technology, it is found in temperature and pressure sensors, supertwisted nematic liquid crystal displays, optical filters, reflective devices, or cosmetics. A…

Liquid Crystal Research AdvancementsPhotonic Crystals and ApplicationsOptical Polarization and Ellipsometry

Photoluminescence Properties of Graphene versus Other Carbon Nanomaterials

Li Cao、Mohammed J. Meziani、Sushant P. Sahu 等 4 位作者2012-10-23Accounts of Chemical Research

Photoluminescent nanomaterials continue to garner research attention because of their many applications. For many years, researchers have focused on quantum dots (QDs) of semiconductor nanocrystals for their excellent performance and predictable fluorescence color variations that depend on the sizes of the nanocrystal…

Graphene research and applicationsCarbon and Quantum Dots ApplicationsGraphene and Nanomaterials Applications

Bioinspired self-cleaning surfaces with superhydrophobicity, superoleophobicity, and superhydrophilicity

Shunsuke Nishimoto、Bharat Bhushan2012-10-23RSC Advances

Self-cleaning methods currently employed are based on understanding of the functions, structures, and principles of various objects found in living nature. Three types of surfaces, including superhydrophobic, superoleophobic, and superhydrophilic, offer solutions to keep a surface clean. In this review article, an ove…

Surface Modification and SuperhydrophobicityAdhesion, Friction, and Surface InteractionsBiocrusts and Microbial Ecology

Templated synthesis of nanostructured materials

Yiding Liu、James Goebl、Yadong Yin2012-10-23Chemical Society Reviews

Templating is one of the most important techniques for the controlled synthesis of nanostructured materials. This powerful tool uses a pre-existing guide with desired nanoscale features to direct the formation of nanomaterials into forms that are otherwise difficult to obtain. As a result, templated synthesis is capab…

Quantum Dots Synthesis And PropertiesMesoporous Materials and CatalysisPolymer Surface Interaction Studies

Nanostructured carbon–metal oxide composite electrodes for supercapacitors: a review

Mingjia Zhi、Chengcheng Xiang、Jiangtian Li 等 5 位作者2012-10-23Nanoscale

This paper presents a review of the research progress in the carbon-metal oxide composites for supercapacitor electrodes. In the past decade, various carbon-metal oxide composite electrodes have been developed by integrating metal oxides into different carbon nanostructures including zero-dimensional carbon nanopartic…

Advancements in Battery MaterialsSupercapacitor Materials and FabricationElectrochemical sensors and biosensors

Nanostructured Hydroxyapatite-Chitosan Composite Biomaterial for Bone Tissue Engineering

Jayachandran Venkatesan、Se‐Kwon Kim2012-10-22Advanced materials research

In the recent years, significant developments have been achieved with chitosan and hydroxyapatite (HAp) scaffolds for bone tissue engineering. In the present study, chitosan/nanostructured hydroxyapatite (Chitosan/nHAp) has been prepared and subsequently characterized physicochemically for bone graft substitution. The…

Bone Tissue Engineering Materialsbiodegradable polymer synthesis and propertiesElectrospun Nanofibers in Biomedical Applications

Spectrally Resolved Chemiluminescent Probes for Sensitive Multiplex Molecular Quantification

Kenneth A. Browne、Dimitri D. Deheyn、Richard C. D. Brown 等 4 位作者2012-10-22Analytical Chemistry

Luminophores are frequently utilized probe labels for detecting biological analytes. Multiple fluorescent luminophores, or fluorophores, can be readily distinguished from one another based on different energy excitation and emission wavelengths and lifetimes. However, suitable methods and reagents for distinguishing m…

Advanced biosensing and bioanalysis techniquesMolecular Sensors and Ion DetectionLuminescence and Fluorescent Materials

Anchoring effects on the electrically controlled optical band gap in twisted photonic liquid crystals

Carlos Avendaño、Ismael Molina、J. A. Reyes2012-10-22Liquid Crystals

We study a one-dimensional twisted photonic liquid crystal (TPLC), consisting of various nematic liquid crystal cells adopting a twisted configuration intercalated by isotropic dielectric layers, submitted to a dc electric field (Edc ) aligned along the periodicity axis. We write the corresponding Euler–Lagrange equat…

Photonic and Optical DevicesLiquid Crystal Research AdvancementsPhotonic Crystals and Applications

Critical flux ratio of hydrogen radical to film precursor in microcrystalline silicon deposition for solar cells

Yusuke Abe、Atsushi Fukushima、Keigo Takeda 等 7 位作者2012-10-22Applied Physics Letters

The properties of thin-film silicon grown by plasma enhanced chemical vapor deposition were investigated with respect to the flux ratio of hydrogen radical to film precursor. The absolute density and translational temperature of H radicals in SiH4/H2 capacitively coupled plasma were measured using vacuum ultraviolet l…

Thin-Film Transistor TechnologiesSilicon and Solar Cell TechnologiesSilicon Nanostructures and Photoluminescence

Efficient Hydrogenated Amorphous Silicon Thin-Film Solar Cells Using Zinc Oxide Deposited by Atomic Layer Deposition as a Protective Interfacial Layer

Young-Joo Lee、Min‐Seung Choi、Dong‐Ho Kim 等 12 位作者2012-10-22The Journal of Physical Chemistry C

A single zinc oxide (ZnO) layer deposited by atomic layer deposition (ALD) was employed as a buffer layer on textured fluorine-doped tin oxide (FTO) glass in p-i-n-type hydrogenated amorphous silicon solar cells (a-Si:H SCs). ZnO was deposited between FTO glass and a p-type a-Si:H layer. The device with a 2 nm thick Z…

ZnO doping and propertiesThin-Film Transistor TechnologiesSilicon and Solar Cell Technologies

Biocompatibility of crystalline opal nanoparticles

M. Hernández-Ortíz、Laura Susana Acosta‐Torres、Genoveva Hernández‐Padrón 等 7 位作者2012-10-22BioMedical Engineering OnLine

BACKGROUND: Silica nanoparticles are being developed as a host of biomedical and biotechnological applications. For this reason, there are more studies about biocompatibility of silica with amorphous and crystalline structure. Except hydrated silica (opal), despite is presents directly and indirectly in humans. Two si…

Nanoparticles: synthesis and applicationsPhotonic Crystals and ApplicationsMineralogy and Gemology Studies

Prism dispersion effects in near‐guided‐wave surface plasmon resonance sensors

Atef Shalabney、Ibrahim Abdulhalim2012-10-22Annalen der Physik

Abstract Refractive index dispersion causes the light line to curve. As a result it is shown that when the prism is dispersive, an additional dip in the spectral response of Surface Plasmon Resonance (SPR) sensors is observed in the Kretschmann‐Raether (KR) configuration. Since the new dip evolves in the infrared (IR)…

Gold and Silver Nanoparticles Synthesis and ApplicationsPlasmonic and Surface Plasmon ResearchPhotonic and Optical Devices

Corynebacterium glutamicumCsoR Acts as a Transcriptional Repressor of Two Copper/Zinc-Inducible P1B-Type ATPase Operons

Haruhiko Teramoto、Masayuki Inui、Hideaki Yukawa2012-10-22Bioscience Biotechnology and Biochemistry

The mechanism of regulation of the expression of copA and copB, encoding putative copper-translocating P(1B)-type ATPases in Corynebacterium glutamicum, was investigated. The levels of copA and copB mRNAs were upregulated in response to excess copper as well as excess zinc. Disruption of csoR, encoding a transcription…

RNA and protein synthesis mechanismsEnzyme Structure and FunctionATP Synthase and ATPases Research

Effect of Rolling Temperature on Microstructure and Mechanical Properties of Cryorolled Al-Mg-Si Alloy Reinforced with 3wt% TiB2 In Situ Composite

B. Gopi、N. Naga Krishna、K. Sivaprasad 等 4 位作者2012-10-22Advanced materials research

The present work investigates the effect of rolling temperature on the mechanical properties and microstructural evolution of an Al-Mg-Si alloy with 3wt% TiB2 in-situ composite that was fabricated by stir casting route. The composite was rolled to a true strain of ≈0.7 at three different temperatures viz; room tempera…

Microstructure and mechanical propertiesAluminum Alloy Microstructure PropertiesAluminum Alloys Composites Properties

Independence of plasmonic near-field enhancements to illumination beam profile

Matthew R. Foreman、Yonatan Sivan、Stefan A. Maier 等 4 位作者2012-10-22Physical Review B

Near-field enhancements of the electric field at the center of spheroidal multilayer metallic nanoparticles (NPs) are investigated when illuminated by focused beams of arbitrary field structure (i.e., amplitude, phase, and polarization distributions). Employing a Mie-type representation, the enhancement at the center…

Gold and Silver Nanoparticles Synthesis and ApplicationsPlasmonic and Surface Plasmon ResearchNear-Field Optical Microscopy

Ca10Pt7Tt3 (Tt = Si, Ge): New Platinide Phases Featuring Electron-Rich 4c–6e Bonded [Pt7Tt3]20– Intermetalloid Clusters

Isa Doverbratt、Siméon Ponou、Sven Lidin 等 4 位作者2012-10-22Inorganic Chemistry

Two new phases Ca(10)Pt(7)Tt(3) (with Tt = Si, Ge) were obtained by reacting stoichiometric mixtures of the elements at high temperature. Their structures were refined from single crystal X-ray diffraction data. They are isostructural and crystallize in the Ba(10)Al(3)Ge(7) type structure, space group P6(3)/mcm (No. 1…

Rare-earth and actinide compoundsIron-based superconductors researchInorganic Chemistry and Materials

Temperature dependent band offsets in PbSe/PbEuSe quantum well heterostructures

M. Simma、G. Bauer、G. Springholz2012-10-22Applied Physics Letters

The band offsets of PbSe/Pb1−xEuxSe multi-quantum wells grown by molecular beam epitaxy are determined as a function of temperature and europium content using temperature-modulated differential transmission spectroscopy. The confined quantum well states in the valence and conduction bands are analyzed using a k·p mode…

Semiconductor Quantum Structures and DevicesQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin Films

Effect of diamond like carbon layer on heat dissipation and optoelectronic performance of vertical-type InGaN light emitting diodes

Ray‐Hua Horng、Wei-Cheng Kao、Sin-Liang Ou 等 4 位作者2012-10-22Applied Physics Letters

This study reports the transfer of InGaN light-emitting diodes (LEDs) embedded with and without a diamond like carbon (DLC) layer to Si substrates. It also investigates the heat dissipation and output power performance after the addition of the DLC layer. The LED device with a DLC layer had a lower thermal resistance…

GaN-based semiconductor devices and materialsMetal and Thin Film MechanicsDiamond and Carbon-based Materials Research

Synthesis, Characterization and Bioactivity Studies of Calcium Silicate Bioceramics

R. Lakshmi、Sasikumar Swamiappan2012-10-22Advanced materials research

Wollastonite is one of the most widely used bioceramic due to its biocompatibility and bioactivity. Wollastonite (CaSiO3) was synthesized by sol-gel combustion process using citric acid as a fuel/reductant and nitrate as an oxidant. Calcium nitrate was taken as a source of calcium and tetraethyl orthosilicate was take…

Bone Tissue Engineering MaterialsCalcium Carbonate Crystallization and InhibitionDiatoms and Algae Research

Cascade Molecule–Particle–Molecule Self-Assemblies for Fabricating Narrowly Size-Distributed Polymeric Superparticles with a Bicontinuous Nanostructure

Yong Gao、Yafen Wang、Ming Jiang 等 4 位作者2012-10-22ACS Macro Letters

Broader developments of nanoscience and nanotechnology require complexly but regularly structured nanoparticles whose fabrications in turn pose a great challenge to nanoscience and nanotechnology. In this communication, we report a new and robust method with a clear mechanism for fabricating narrowly size-distributed…

Advanced Polymer Synthesis and CharacterizationPolymer Surface Interaction StudiesBlock Copolymer Self-Assembly