Toshio Sakai、Paschalis Alexandridis2005-04-15Nanotechnology
Gold nanoparticles with an average diameter in the range 5-20 nm have been synthesized from hydrogen tetrachloroaureate (III) hydrate (HAuCl(4)·3H(2)O) in air-saturated aqueous PEO-PPO-PEO block copolymer solutions at ambient temperature in the absence of any other reducing agent (PEO: poly(ethylene oxide), PPO: poly(…
Nanoparticles: synthesis and applicationsGold and Silver Nanoparticles Synthesis and ApplicationsLaser-Ablation Synthesis of Nanoparticles
Luis F. Hakim、Steven M. George、Alan W. Weimer2005-04-15Nanotechnology
Primary zirconia nanoparticles were conformally coated with alumina ultrathin films using atomic layer deposition (ALD) in a fluidized bed reactor. Alternating doses of trimethylaluminium and water vapour were performed to deposit Al(2)O(3) nanolayers on the surface of 26 nm zirconia nanoparticles. Transmission Fourie…
Catalytic Processes in Materials ScienceCoagulation and Flocculation StudiesParticle Dynamics in Fluid Flows
Donna M. Hylton、Shalaby W. Shalaby、Robert A. Latour2005-04-15Journal of Biomedical Materials Research Part A
It is widely recognized that adsorbed proteins on biomaterial surfaces tend to initiate thrombus formation, although the specific mechanisms involved are still not well understood. In attempts to decrease the conformational change of adsorbed proteins, surface treatments that reduce surface hydrophobicity have been co…
Polymer Surface Interaction StudiesProtein purification and stabilityBlood properties and coagulation
Zhangang Han、Yu‐Long Zhao、Jun Peng 等 6 位作者2005-04-15Electroanalysis
Abstract The inorganic‐organic hybrid polyoxometalates (POMs), (pbpy) 4 H[PMo 12 O 40 (VO)] ( 1 ) and (pbpy) 4 H 4 [SiMo 12 O 40 ] ( 2 ) (pbpy=5‐phenyl‐2‐(4‐pyridinyl)pyridine), have been synthesized and were, respectively, used as a solid bulkmodifier to fabricate a three‐dimensional bulk‐modified carbon paste electr…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis
Tsung‐Hsien Lin、Yi‐Jan Emery Chen、Chun-Hui Wu 等 6 位作者2005-04-15Applied Physics Letters
This letter examines a planar cholesteric cell (CLC) doped with two collocated laser dyes as a one-dimensional photonic crystal. Adding phototunable chiral material (AzoB) allows the CLC photonic crystal to be lased at the band edges of the photonic band gap with a tuning range of over 100nm. Tuning is performed by ir…
Liquid Crystal Research AdvancementsPhotonic Crystals and ApplicationsPlant Reproductive Biology
Dmitri Tsyboulski、Sergei M. Bachilo、R. Bruce Weisman2005-04-15Nano Letters
Fluorescence microscopy in the near-infrared between 950 and 1600 nm has been developed as a novel method to image and study single-walled carbon nanotubes (SWNTs) in a variety of environments. Intrinsic photoluminescence of disaggregated pristine SWNTs was excited by a diode laser and detected with a two-dimensional…
Carbon Nanotubes in CompositesMechanical and Optical ResonatorsNanotechnology research and applications
Yi Zhang、Hong Sun、Changfeng Chen2005-04-15Physical Review Letters
We report on a first-principles study of the structural deformation modes in diamond, cubic boron nitride ($c\mathrm{\text{\ensuremath{-}}}\mathrm{BN}$), and cubic ${\mathrm{BC}}_{2}\mathrm{N}$. We show that (i) the diamond C-C bonds remain strong up to the breaking point, leading to the large and nearly identical she…
Metal and Thin Film MechanicsDiamond and Carbon-based Materials ResearchBoron and Carbon Nanomaterials Research
Andreas Hohenau、Joachim R. Krenn、А. Л. Степанов 等 8 位作者2005-04-15Optics Letters
Basic optical elements for surface plasmons are fabricated and their functionality (focusing, refraction, and total internal reflection) is demonstrated experimentally. The optical elements consist of dielectric structures of defined geometry on top of a gold film. The working principle of these structures is discusse…
Photonic and Optical DevicesPhotonic Crystals and ApplicationsOptical Coatings and Gratings
J. Okumu、Christian Dahmen、Alexander Sprafke 等 6 位作者2005-04-15Journal of Applied Physics
In this study a simple route to preparing photochromic silver nanoparticles in a TiO2 matrix is presented, which is based upon sputtering and subsequent annealing. The formation of silver nanoparticles with sizes of some tens of nanometers is confirmed by x-ray diffraction and transmission electron microscopy. The inh…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesCopper-based nanomaterials and applications
Chih-Wei Chang、Wei‐Qiang Han、Alex Zettl2005-04-15Applied Physics Letters
We have measured the temperature-dependent thermal conductivity κ(T) of boron–carbon–nitride (B–C–N) and boron nitride (BN) nanotube mats between room temperature and 20K. For both materials, κ(T) increases with increasing temperature, with no sign of saturation. We employ an analysis method to estimate the intrinsic…
Advanced ceramic materials synthesisThermal properties of materialsBoron and Carbon Nanomaterials Research
Qiong Ye、Yong-Hua Li、Yu‐Mei Song 等 6 位作者2005-04-15Inorganic Chemistry
The in situ hydrothermal reactions of ZnCl(2) with benzonitrile, 2-amino-5-cyanopyridine, and trans-2,3-dihydro-2-(4' '-cyanophenyl)-benzo[e]indole in the presence of NaN(3) and water afford two 3D-diamond-like networks, (CN(4)-C(6)H(5))(2)Zn (1) and (NH(2)-C(5)H(3)N-CN(4))(2)Zn (2), and one 2D square grid network, [(…
Metal-Organic Frameworks: Synthesis and ApplicationsCrystal structures of chemical compoundsNonlinear Optical Materials Research
S Crampin2005-04-15arXiv
The inelastic lifetimes of electrons in image-potential states at Cu(100) that are Stark-shifted by the electrostatic tip-sample interaction in the scanning tunneling microscope are calculated using the many-body GW approximation. The results demonstrate that in typical tunneling conditions the image state lifetimes a…
Materials Science
T. Motohashi、V. Caignaert、V. Pralong 等 6 位作者2005-04-15arXiv
The oxygen-deficient perovskite cobaltite SrCo1-xNbxO3-d was synthesized by direct solid-state reaction and its magnetotransport properties were investigated. This cobaltite exhibits an unusual ferromagnetic behavior with a transition temperature Tm = 130-150 K and a spin glass like behavior below Tm. Importantly, thi…
Materials ScienceStrongly Correlated Electrons
Julia E. Medvedeva、A. J. Freeman、Xiangyuan Cui 等 5 位作者2005-04-15Physical Review Letters
First-principles investigations of the structural, electronic, and magnetic properties of Cr-doped AlN/GaN (0001) heterostructures reveal the possibility of efficient spin injection from a ferromagnetic GaN:Cr electrode through an AlN tunnel barrier. We demonstrate that Cr atoms segregate into the GaN region and that…
ZnO doping and propertiesGaN-based semiconductor devices and materialsMetal and Thin Film Mechanics
Takafumi Ueno、Tomomi Koshiyama、Masataka Ohashi 等 8 位作者2005-04-15Journal of the American Chemical Society
New methods for the synthesis of artificial metalloenzymes are important for the construction of novel biocatalysts and biomaterials. Recently, we reported new methodology for the synthesis of artificial metalloenzymes by reconstituting apo-myoglobin with metal complexes (Ohashi, M. et al., Angew Chem., Int. Ed. 2003,…
Porphyrin and Phthalocyanine ChemistryMolecular Junctions and NanostructuresMetalloenzymes and iron-sulfur proteins
Rui Zhang、John H. Horner、Martin Newcomb2005-04-15Journal of the American Chemical Society
Porphyrin-manganese(V)-oxo and porphyrin-manganese(IV)-oxo species were produced in organic solvents by laser flash photolysis (LFP) of the corresponding porphyrin-manganese(III) perchlorate and chlorate complexes, respectively, permitting direct kinetic studies. The porphyrin systems studied were 5,10,15,20-tetraphen…
Porphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer StudiesMetal-Catalyzed Oxygenation Mechanisms
Michał Kruk、Bruno Dufour、Ewa B. Celer 等 6 位作者2005-04-15The Journal of Physical Chemistry B
Mesoporous carbons were synthesized from polyacrylonitrile (PAN) using ordered and disordered mesoporous silica templates and were characterized using transmission electron microscopy (TEM), powder X-ray diffraction, nitrogen adsorption, and thermogravimetry. The pores of the silica templates were infiltrated with car…
Supercapacitor Materials and FabricationZeolite Catalysis and SynthesisMesoporous Materials and Catalysis
Shuaigang Xiao、XiaoMin Yang、Erik W. Edwards 等 5 位作者2005-04-15Nanotechnology
We report a method to fabricate high-quality patterned magnetic dot arrays using block copolymer lithography, metal deposition, and a dry lift-off technique. Long-range order of cylindrical domains oriented perpendicular to the substrate and in hexagonal arrays was induced in the block copolymer films by prepatterning…
Block Copolymer Self-AssemblyAnodic Oxide Films and NanostructuresFerroelectric and Negative Capacitance Devices
Mathias Ulbricht、Hu Yang2005-04-15Chemistry of Materials
Photoinitiated surface-selective graft copolymerization onto polypropylene (PP) microfiltration membranes was performed using two different methods for coating the photoinitiator, benzophenone (BP), on the membrane surface. An already established adsorption method and a novel method based on preswelling of the PP in h…
Surface Modification and SuperhydrophobicityAdvanced Sensor and Energy Harvesting MaterialsPolymer Surface Interaction Studies
Chengchun Tang、Yoshio Bando、Yang Huang 等 7 位作者2005-04-15Journal of the American Chemical Society
Fluorination of BN nanotubes has been performed using a catalytic growth method, which leads to the appearance of markedly curved fluorine-doped BN sheets and converts originally insulating BN nanotubes to semiconductors, as confirmed by the comparative electron transport four-probe measurements on doped and undoped i…
Graphene research and applicationsBoron and Carbon Nanomaterials ResearchMXene and MAX Phase Materials