Materials Literature
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Structure and properties of defects in amorphous silica: new insights from embedded cluster calculations, Sushko, Peter V, Mukhopadhyay, Sanghamitra, Mysovsky, Andrey S, Sulimov, Vladimir B, Taga, Adrian, Shluger, Alexander L
A new methodology to immobilize ionic liquids through the use of a bridged silsesquioxane N-(3-triethoxysilylpropyl), N(3)-(3-trimethoxysilylpropyl-4,5-dihydroimidazolium iodide that incorporates an ionic functionality for the assembly of novel periodic mesoporous organosilica (PMO) materials has been developed. The r…
Photochemical reduction of tetrachloroaurate (AuCl4-) ions in the highly constrained aqueous domains of a nanostructured ionogel template, formed via self-assembly of the ionic liquid 1-decyl-3-methylimidazolium chloride (C10mim+Cl-) in water, results in the formation of anisotropic gold nanoparticles with a variety o…
In der Schleife: Ein reversibler Spinübergang ließ sich Raman-spektroskopisch bei Anwendung eines einzelnen Laserpulses (8 ns) in der Hystereseschleife des Spin-Crossover-Komplexes [Fe(pyrazin){Pt(CN)4}] beobachten. Dieses bidirektionale, photoinduzierte Spinumschalten passiert bei Raumtemperatur über einen weiten Bis…
One of the design goals of the neutron time-of-flight (TOF) diffractometer HIPPO (High Pressure–Preferred Orientation) at LANSCE (Los Alamos Neutron Science Center) was efficient quantitative texture analysis. In this paper, the effects of the HIPPO detector geometry and layout on texture analysis, particularly the sh…
Quasielastic neutron scattering (QENS) spectra of water-filled MCM-41 samples (pore diameters: 21.4 and 28.4 Angstrom) were measured over the temperature range 238-298 K and the momentum transfer range 0.31-0.99 A(-1) to investigate the dynamics of confined water molecules. The spectra, which consist mainly of contrib…
Current-density functional theory has been formulated in terms of the paramagnetic (or canonical) current densities ${\mathbf{j}}_{p\ensuremath{\sigma}}(\mathbf{r})$, where $\ensuremath{\sigma}=\ensuremath{\uparrow},\ensuremath{\downarrow}$. Vignale and Rasolt argued that ${\mathbf{j}}_{p\ensuremath{\sigma}}$ enter th…
Abstract We present a highly explosive binary system based on porous silicon layers with their pores filled with solid oxidizers. The porous layers are produced by a standard electrochemical etching process and exhibit properties that are different from other energetic materials. Its production is completely compatibl…
Abstract The flammability of montmorillonite (MMT)/SBR nanocomposites, prepared by the technique of cocoagulating rubber latex and clay aqueous suspension, was investigated. Flammability studies, performed on the cone calorimeter, showed that the maximum heat release rate (HRR) of SBR decreased from 1987 to 1442 kw/m…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPolyether-Grafted ZnO Nanoparticles with Tunable and Stable Photoluminescence at Room TemperatureHuan-Ming Xiong, Da-Peng Liu, Yong-Yao Xia, and Jie-Sheng ChenView Author Information State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chem…
We present a new approach for the fabrication of thermoresponsive polymer microcapsules with mobile magnetic cores that undergo a volume phase-transition upon changing the temperature and are collected under an external magnetic field. We have prepared organic/inorganic composite microspheres with a well-defined core-…
Two-dimensional ordered arrays of gold (Au) nanoparticles were fabricated using two different variants of the nanosphere lithography technique. First, ordered arrays of polystyrene nanospheres on Si substrate were used as deposition masks through which gold films were deposited by electron beam evaporation. After the…
We report here investigations on the instability in luminescence of bare (TOPO-stabilized) and CdS- capped CdSe particles under infrared radiation. During photo-thermal annealing the formation of oxide layers on the surfaces of the particles create defect states. Consequently there is a reduction in particle size. The…
Theoretical model of the enhanced optical resolution of the surface plasmon immersion microscope is developed, which is based on the optics of surface plasmon Bloch waves in the tightly bound approximation. It is shown that a similar resolution enhancement may occur in a more general case of an immersion microscope ba…
We explore the midinfrared absorption of strain-compensated p-Si0.2Ge0.8/Si quantum wells for various well thicknesses and temperatures. Owing to the large band offset due to the large bi-axial strain contrast between the wells and barriers, the intersubband transitions energies from the ground state to the excited he…
Magnetization reversal of individual, isolated high-aspect-ratio Fe nanoparticles with diameters comparable to the magnetic exchange length is studied by high-sensitivity submicron Hall magnetometry. For a Fe nanoparticle with diameter of 5 nm, the magnetization reversal is found to be an incoherent process with local…
Using the full potential linearized augmented plane-wave method we study the electronic and magnetic properties of the (001) and (111) surfaces of the half-metallic Heusler alloy NiMnSb from first principles. We take into account all possible surface terminations including relaxations of these surfaces. Special attent…
Orthorhombic Y$_{1-x}$Ca$_x$MnO$_3$ ($0 \leq x \leq 0.5$) was prepared under high pressure and the variations with $x$ of its structural, magnetic, electrical properties and the polarized Raman spectra were investigated. The lattice parameters change systematically with $x$. Although there are strong indications for i…
Using in-situ angle dispersive x-ray diffraction, we have shown that barium tungstate, which exists in scheelite phase at ambient conditions, transforms to a new phase about seven giga pascal. Analysis of our data based on Le bail refinement suggests that this phase could be fergusonite and not mercuric molybdate type…
This paper describes the reaction of the phosphine-protected Au nanoparticle Au(55)(PPh(3))(12)Cl(6) (1, "Au55") with hexanethiol (2) and other thiols. The voltammetry of the reaction product 2 displays a well-defined pattern of peaks qualitatively reminiscent of Au(38) nanoparticles, but with quite different spacing…