Materials Literature
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Ordered mesoporous materials have been synthesized by co-condensation of bis(triethoxysilyl)ethane and N -(2-aminoethyl)-3-aminopropyltrimethoxysilane (AAPTS) under basic conditions with supramolecular templates of cetyltrimethylammonium chloride as structure-directing agents. Incorporation of the templates into the m…
Brillouin light scattering from silicon oxynitride films grown on GaAs reveals a low frequency elastic wave excitation at frequencies lying below that of the Rayleigh surface wave. This mode, identified as an excitation localized by the interface, arises from the presence of a soft, thin transition layer between the f…
We present a detailed study, within the mean-field approximation, of an impurity band model for III-V diluted magnetic semiconductors. Such a model should be relevant at low carrier densities, below and near the metal-insulator transition. Positional disorder of the magnetic impurities inside the host semiconductor is…
Thermal analysis has not been as widely adopted in the study of organo-clay complexes as either x-ray diffraction or infrared spectroscopy. Nevertheless, since the end of the 1940s there have appeared numerous papers dealing with this subject, predominantly aimed at an understanding of the fundamental science, reporti…
A surface modification method that is particularly applicable to complexly shaped fabricated devices has long been awaited. In this article, we describe the visible-light-induced surface photograft polymerization technique by which an inner surface of the device is modified by visible-light irradiation through the ext…
The term “ clay minerals” is derived from the definition originally used by sedimentologists and soil scientists for the fraction of particles having very small size, with an equivalent diameter smaller than 2 μιη, which is the “ clay fraction.” Particles in this size range can include quartz, carbonates, metal oxides…
Radical chain transfer to bonded thiol groups and surface re-initiated polymerization resulted in ultra-thin polymer films.
The substitution of a terminal hydride ligand in the complexes [Ir(2)(mu-H)(mu-Pz)(2)H(3)(L)P(i)Pr(3))(2)] (L = NCCH(3) (1) or pyrazole (3)) by chloride provokes a significant change in the lability of the L ligand, despite the fact that the substituted hydride and the L ligand lie in opposite extremes of the diiridiu…
Single molecule spectroscopy was used to measure the rotations of fluorescent probe molecules in thin films of poly(methyl acrylate) and poly( n -butyl methacrylate) just above their glass-transition temperatures. By collecting the polarized fluorescence from isolated probe molecules, the rotational diffusion of singl…
Therapies directed toward stimulation of angiogenesis seek to accelerate the development of new blood vessels in tissues rendered dysfunctional because of an insufficient microvascular supply. The goal of the current study was the stimulation of an angiogenic response around and within porous biomedical implants, such…
Temperature variation of the magnetic susceptibility \ensuremath{\chi}, resistivity \ensuremath{\rho}, specific heat C, and lattice constants has been investigated in electron-doped ${\mathrm{CaMnO}}_{3}.$ The parent ${\mathrm{CaMnO}}_{3}$ is an antiferromagnetic band insulator, and shows an insulator-metal crossover…
Transition metals are well known as optically active dopants in crystalline hosts because they fluoresce broadly in the near-IR; examples include Ti<SUP>3+</SUP>:sapphire (Al<SUB>2</SUB>O<SUB>3</SUB>) and Cr<SUP>4+</SUP>:forsterite (Mg<SUB>2</SUB>SiO<SUB>4</SUB>). Because transition element ions yield stronger optical…
A synthetic unsymmetrical 1-galactosamide bolaamphiphile self-assembles in methanol to form a multilayer structure comprising unsymmetrical monolayer lipid membranes linked via a sugar-carboxylic acid H-bonding interface.
The synthesis and characterization of a copper(I) complex containing two-coordinated chelating verdazyl radicals are described. The structure (shown) consists of a distorted tetrahedral geometry at the copper ion; the angle between the planes defined by the two verdazyl rings is nearly 116°. Variable-temperature magne…
The interactions between organic matter and clay minerals are among the most widespread reactions in nature. The adsorption of organic material by clay miner als has been widely investigated during the last decade and has been extensively reviewed (see, e.g., Weiss, 1969; Mortland, 1970; Theng, 1974, 1979; Yariv and…
We study the recently observed orbital excitations, orbitons, and treat electron-electron correlations and lattice dynamics on an equal footing. It is shown that the orbiton energy and dispersion are determined by both correlations and lattice vibrations. The electron-phonon coupling causes satellite structures in the…
Biodegradable scaffolds serve a central role in many strategies for engineering tissue replacements or in guiding tissue regeneration. Typically, these scaffolds function to create and maintain a space and to provide a support for cell adhesion. However, these scaffolds also can serve as vehicles for the delivery of b…
By considering the catalytic mechanisms underlying the formation of various nanocarbon deposits on catalytic metal surfaces, we conclude that the majority of these mechanisms include some common steps. The most important of these is the nucleation of the carbon deposit on the metal surface. On the basis of experimenta…
High-temperature atomic force microscopy (AFM) was used for in-situ monitoring of melt−crystallization of poly(ethylene terephthalate) (PET) at 233 °C. The observed evolution of the lamellar structure allowed identification of the stack thickening process at the secondary crystallization stage. This finding explains t…
With the number of cerium doped radiation resistant glasses available to the designer of space optics rapidly decreasing, it is critical to identify and characterize all potential sources of radiation resistant glasses and crystals. Unfortunately much of the data on radiation testing of glasses is quite old and often…