Rajesh R. Naik、Patrick W. Whitlock、Francisco Rodrı́guez 等 7 位作者2002-12-11Chemical Communications
Herein we describe the controlled formation of biosilica structures by manipulation of the physical reaction environment; we were able to synthesize arched and elongated silica structures using a synthetic peptide; the results presented here are evidence that in vitro biocatalysis may be controlled in order to form de…
Protist diversity and phylogenyDiatoms and Algae Research
Hendry Izaac Elim、Wei Ji、Gwee Chen Meng 等 5 位作者2002-12-11arXiv
The nonlinear optics and optical limiting properties of materials based on multifunctional fullerenol and poly(styrene-co-4-vinylpyridine) matrix were studied using 7 ns pulses of nanosecond laser operating at 532 nm wavelength. The observed imaginary and real parts of third order susceptibility of the fullerenol/poly…
Materials Sciencenlin.SIChemical Physicsphysics.optics
Patrick Grosfils、Jean Pierre Boon2002-12-11arXiv
With the Lattice Boltzmann method (using the BGK approximation) we investigate the dynamics of Hele-Shaw flow under conditions corresponding to various experimental systems. We discuss the onset of the instability (dispersion relation), the static properties (characterization of the interface) and the dynamic properti…
Materials Sciencecond-mat.stat-mech
M. Pieruccini、S. Savasta、R. Girlanda 等 5 位作者2002-12-11arXiv
We propose a general theoretical scheme for the investigation of light emitted from nano- and micrometric structures of arbitrary shape and composition. More specifically, the proposed fully three-dimensional approach allows to derive the light-intensity distributions around the emitting structures and their modificat…
Materials Science
Francesco Giazotto、Fabio Taddei、Rosario Fazio 等 4 位作者2002-12-11arXiv
A method for measuring the degree of spin polarization of magnetic materials based on spin-dependent resonant tunneling is proposed. The device we consider is a ballistic double-barrier resonant structure consisting of a ferromagnetic layer embedded between two insulating barriers. A simple procedure, based on a detai…
Mesoscale and Nanoscale PhysicsMaterials Science
A. Hannemann、J. C. Schon、M. Jansen 等 4 位作者2002-12-11arXiv
We present numerical investigations of the dynamics on the energy landscape of a realistic model of the high-temperature ceramic a-Si3B3N7. Below a critical temperature Tc = 2000 K, the system is no longer in equilibrium, and we predict that the material has a glass transition in this temperature range at high pressur…
cond-mat.dis-nnMaterials Sciencecond-mat.stat-mech
Dragoş Ciuparu、Maxim Lyubovsky、Eric I. Altman 等 5 位作者2002-12-11OpenAlex
Palladium-based catalysts are widely applied in exhaust catalytic converter and catalytic combustion systems. The mechanism for methane oxidation on a Pd-based catalyst is complex. Catalyst activity is influenced by variations in the process pressure and temperature, by the gas mixture composition, by the type of supp…
Catalytic Processes in Materials ScienceCatalysts for Methane ReformingCatalysis and Oxidation Reactions
Aaron S. Kelley、Friedrich Srienc2002-12-10ACS symposium series
Polyhydroxyalkanoates (PHAs) are biodegradable polyesters produced by many bacterial species. They are a natural part of the renewable carbon life cycle and are a sustainable source of plastics into the future. PHA production, however, cost about ten times as much as petroleum-derived thermoplastics. The value of the…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionCarbon dioxide utilization in catalysis
Charusita Chakravarty2002-12-10Molecular Physics
Bond orientational order parameters for the global minimum energy configurations of a number of Lennard-Jones and Morse clusters are calculated. The results demonstrate that the bond orientational order parameters, particularly the third-order invariants, provide a fairly discriminating set of symmetry markers for dif…
Material Dynamics and PropertiesGlass properties and applicationsChemical Thermodynamics and Molecular Structure
Ján Šefčı́k、Stephen E. Rankin2002-12-10The Journal of Physical Chemistry B
Sol−gel processing provides a useful route to novel metastable materials such as molecular hybrids of silica and either transition metal oxides or organic components. Because the properties of these materials depend critically on how the components are combined, we present calculations of the size and structure of sil…
Zeolite Catalysis and SynthesisPhotonic Crystals and ApplicationsMesoporous Materials and Catalysis
Huiping Li、Hou Zhu-Feng、HUANG MEI-CHUN 等 4 位作者2002-12-10Chinese Physics Letters
An ab initio method with mixed-basis norm-conserving non-local pseudo-potentials has been employed to investigate the electronic structures of LiMgN. The band structure, electronic density of states and charge density contour plot of LiMgN are also presented. By the calculation, we have found that LiMgN with a zincble…
Boron and Carbon Nanomaterials ResearchMXene and MAX Phase MaterialsHeusler alloys: electronic and magnetic properties
V. P. Romanov、S. V. Ul’yanov2002-12-10Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
Dynamic properties and layer displacement-layer displacement correlation functions of the smectic-A films on a substrate are investigated. The eigenfrequencies spectrum and eigenmotions of the film are calculated within the framework of a discrete model. It was found that the static as well as dynamic properties of fr…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesPhotonic Crystals and Applications
Luc Beaudet、Kazi-Zakir Hossain、Louis Mercier2002-12-10Chemistry of Materials
The preparation of a series of organically functionalized wormhole-motif microspherical MSU-X silicas mesostructures was achieved by a direct synthesis process involving the addition of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) to mildly acidified solutions of a structure-directing nonionic…
Mesoporous Materials and CatalysisPolyoxometalates: Synthesis and ApplicationsAerogels and thermal insulation
Alexander V. Stronski2002-12-10Semiconductor Physics Quantum Electronics & Optoelectronics
Thin vacuum-evaporated layers of As 40 S 60x Se x composition are investigated using Raman spectroscopy from the viewpoint of thermo-and photostructural transformations in them. These transformations are considered as changes in their network structure including three types of piramidal units AsS 3/2 , AsSe 3/2 and As…
Phase-change materials and chalcogenidesAdvanced Optical Imaging TechnologiesOptical and Acousto-Optic Technologies
Mark Murrie、Daniel Biner、Helen Stœckli-Evans 等 4 位作者2002-12-10Chemical Communications
The role of temperature in the formation of high nuclearity nickel(II) citrate spin clusters is explored, revealing how changes in structure and hence magnetic properties can be triggered through desolvation and ligand reorganisation.
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesMetal-Catalyzed Oxygenation Mechanisms
W. J. Xie、Chongde Cao、Yongjun Lü 等 4 位作者2002-12-10Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
Samples of Pb-Sn eutectic alloy with a high density of 8.5 x 10(3) kg/m(3) are levitated with a single-axis acoustic levitator, and containerlessly melted and then solidified in argon atmosphere. High undercoolings up to 38 K are obtained, which results in a microstructural transition of "lamellas-broken lamellas-dend…
Solidification and crystal growth phenomenaFluid Dynamics and Thin Filmsnanoparticles nucleation surface interactions
John Philip、G. Gnana Prakash、T. Jaykumar 等 5 位作者2002-12-10Physical Review Letters
We provide experimental evidence for stretching and collapse of neutral polymer layers, already adsorbed at an oil-in-water interface, due to its interaction with surfactants. Upon stretching, the first interaction length (2L(0)) follows a power law dependence on surfactant concentration ( proportional, variant C(x)(s…
Polymer Surface Interaction StudiesForce Microscopy Techniques and ApplicationsElectrostatics and Colloid Interactions
Igor Volkov、Marek Cieplak、Joel Koplik 等 4 位作者2002-12-10Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We have carried out molecular dynamics simulations of the crystallization of hard spheres modeling colloidal systems that are studied in conventional and space-based experiments. We use microscopic probes to investigate the effects of gravitational forces, polydispersity, and of bounding walls on the phase structure.…
Proteins in Food SystemsMaterial Dynamics and PropertiesPickering emulsions and particle stabilization
Frank E. Osterloh、Jason S. Martino、Hiroki Hiramatsu 等 4 位作者2002-12-10Nano Letters
Chevrel-type LiMo 3 Se 3 nanowires dissolved in dimethyl sulfoxide were decorated with 13 nm citrate ligated Au particles (water) and 6 nm trioctylphosphineoxide ligated CdSe particles (tetrahydrofuran) by combining the respective solutions at room temperature, followed by mild acidification with hydrochloric acid in…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsMolecular Junctions and Nanostructures
Lisa M. Parsons、Nicklas Bonander、Edward Eisenstein 等 6 位作者2002-12-10Biochemistry
HI0719 belongs to a large family of highly conserved proteins with no definitive molecular function and is found in organisms ranging from bacteria to humans. We describe the NMR structure of HI0719, the first solution structure for a member of this family. The overall fold is similar to the crystal structures of two…
Metabolomics and Mass Spectrometry StudiesBioinformatics and Genomic NetworksEnzyme Structure and Function