Materials Literature
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BIOSS4 steel is essentially a nickel-free austenitic stainless steel developed by the Institute of Metal Research, Chinese Academy of Sciences, in response to nickel allergy problems associated with nickel-containing stainless steels that are widely used in medical applications. The high nitrogen content of this steel…
The kinetics of the aggregation process of DiesterB, a homologous coproduct generated in Verteporfin synthesis (the drug used in the medication Visudyne applied in photodynamic therapy), was investigated by visible spectrophotometry in several aqueous organic solvents (dimethyl sulfoxide (DMSO), acetonitrile, dioxane,…
Abstract This paper describes electrochemical characteristics of poly(methylene blue) electrolytically deposited on glassy carbon and examines the electrocatalytic activity of the polymer toward oxidation of the coenzyme NADH. Redox‐active properties of the cationic polyelectrolyte arose from both electron self‐exchan…
A non-volatile 64 Mb phase-transition RAM is developed by fully integrating a chalcogenide alloy GST (Ge/sub 2/Sb/sub 2/Te/sub 5/) into 0.18 /spl mu/m CMOS technology. This alloy is programmed by resistive heating. To optimize SET/RESET distribution, a 512 kb sub-core architecture, featuring meshed ground line, is pro…
In the field of functionalized polyoxometalates, organosilyl derivatives of polyoxotungstate constitute a special class of hybrid organic-inorganic system. The first organosilyl derivative of the monovacant Dawson heteropolyoxotungstate [alpha2-P2W17O61]10- was obtained by three different methods. The use of two organ…
We report salt-induced phase separation of polyelectrolyte complexes in solution correlates with deposition of polymer multilayers at a surface. Multilayer growth was followed in situ using FTIR-ATR (Fourier transform infrared spectroscopy by attenuated total reflection). The polymer system was quaternized poly(4-viny…
Quasicrystals have both positional and orientational long-range order. Thus, they are essentially anisotropic. However, both theory and experiment show that ordinary linear elastic property (linear phonon elasticity) is isotropic for quasicrystals. To detect the quasicrystal anisotropy the nonlinear elasticity should…
Nanocrystalline materials are single-or multiphase polycrystalline solids with a grain size of the order of a few nanometers (1 nm = 109 m = 10 A˚), typically 1-100 nm in at least one dimension. Since the grain sizes are so small, a significant volume of the microstructure in nanocrystalline materials is composed of in…
Thermal interface materials (TIMs) are widely used in high power integrated circuits. This work introduces multi-walled carbon nanotubes (CNTs) into a silicone composite filled with metal particles, resulting in a TIM with higher thermal conductivity. Anomalous increase in thermal conductivity is found starting at a C…
The morphology of potassium sulfate (K(2)SO(4)) crystals grown in a viscous polymer solution of poly(acrylic acid) (PAA) was remarkably changed from the tilted columnar assembly into zigzag and helical architectures with increasing PAA concentration. The habit modification of orthorhombic K(2)SO(4) with adsorption of…
Phonon modes and their dispersion relations in ultrathin homogeneous dielectric membranes are calculated using elasticity theory. The approach differs from the previous ones by a rigorous account of the effect of the film surfaces on the modes with different polarizations. We compute the heat capacity of membranes and…
The electronic characteristics and the redox properties of each isomer of PW(12)O(40)(3)(-) depend on the arrangement adopted by the metal-oxide framework. At the DFT/BP86 level, we computed the structures of the five isomers of PW(12)O(40)(3)(-) in oxidized form. The energy scale fits the experimental findings as wel…
The effects of peripheral substituents and axial ligands on the electronic structure and properties of iron phthalocyanine, H(16)PcFe, have been investigated using a DFT method. Substitution by electron-withdrawing fluorinated groups alters the ground state of H(16)PcFe and gives rise to large changes in the ionizatio…
Pluronic-PAA, a thermogelling copolymer composed of side chains of poly(acrylic acid) (PAA) grafted onto a backbone of Pluronic copolymer, is of interest as a vehicle for the controlled release of compounds. An important feature of such a vehicle is its bioadhesive/mucoadhesive properties, which in the case of Pluroni…
Single and double resonances in Raman scattering are introduced and six criteria for the observation and identification of double resonances stated. The experimental situation in carbon nanotubes is reviewed in view of these criteria. The evidence for the D mode and the high-energy mode is found to be overwhelming for…
Herein we report the first kinetic study of the intrachannel wall phase-transition of amorphous titania to nanocrystalline anatase for periodic mesoporous titania thin films, monitored by time-resolved in situ high-temperature X-ray diffraction. Structural transformations associated with the phase transition are furth…
Abstract Summary: A novel method was developed to prepare an exfoliated styrene butadiene rubber (SBR)/clay nanocomposite with a strong interface between the clay layers and the rubber. An exfoliation mechanism was proposed and verified based on X‐ray diffraction (XRD)/transmission electron microscopy (TEM) analyses o…
The importance of different surface geometries and thereby the need for versatile surface identification by describing a number of different surface features is emphasized. A set of topographical parameters for the description of the amplitude and spatial and hybrid properties of surfaces was utilized for a versatile…
A clear alternative: Hydrolytic polymerization and assembly of octadecyltrichlorosilane in toluene leads to meltable, structurally stable layered hybrids that are dispersible in common organic solvents (see picture). Such hybrid nanoparticle materials offer great potential as plasticizers and lubricating media.
Using a formulation based on anisotropic elasticity we determine the core energy and Peierls stress of the ${a}_{0}∕2[111]$ screw dislocation in bcc molybdenum at $T=0$. We show that a proper definition of the core energy necessarily involves choosing a reference direction $\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{\m…