Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray crystallographic studies of engineered hydrogen bond networks in a protein-zinc binding siteCharles A. Lesburg and David W. ChristiansonCite this: J. Am. Chem. Soc. 1995, 117, 26, 6838–6844Publication Date (Print):July 1, 1995Publication History Published online1 May 2…
Tetrahedral amorphous carbon (ta-C) is a dense form of amorphous carbon with a structure consisting of a highly tetrahedral bonding network. Approximately 20% of the atoms in ta-C are ${\mathit{sp}}^{2}$ hybridized and the presence of these sites plays an important role in the electrical and optical properties of the…
Recent experiments on suspensions of particles with steeply repulsive interactions are reviewed. These suspensions show the equilibrium freezing-melting transition and a glass transition similar to those obtained in computer simulations of the hard sphere system. The glass transition is identified, firstly, by the ces…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Role of Surfactant Micelles in the Synthesis of the Mesoporous Molecular Sieve MCM-41Chi-Feng Cheng, Zhaohua Luan, and Jacek KlinowskiCite this: Langmuir 1995, 11, 7, 2815–2819Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published in…
The use of liquid-crystal light valves (LCLV's) as nonlinear elements in diffractive optical systems with feedback leads to the formation of a variety of optical patterns. The spectrum of possible spatial instabilities is shown to be even richer when the LCLV's capability for polarization modulation is utilized and in…
The self-trapped-electron center in ${\mathrm{PbCl}}_{2}$ crystals, i.e., the ${\mathrm{Pb}}_{2}^{3+}$ molecular ion resulting from the trapping of a conduction electron by a pair of ${\mathrm{Pb}}^{2+}$ lattice cations along the a direction, exhibits in the 10--78 K temperature range a strong temperature dependence i…
When the Laue technique is applied to ordinary diffractometer devices and detector systems, problems appear with respect to the Lorentz factor that are unsatisfactorily treated in the literature. A detailed treatment of beam divergence and mosaic spread leads to a derivation of the exact expression for the Lorentz fac…
Magnesium orthosilicate (forsterite) whiskers were synthesized by an oxidation‐reduction reaction in the present investigation. These whiskers were rectangular parallelepipeds, with long sides in a cross‐sectional view from two to ten times as long as the short sides, and measuring from several micrometers to 200 μm w…
The variation of the tilt angle with temperature in the smectic C phase has generally been shown to be non-existent or very slow for compounds or mixtures with the nematic-smectic C transition, while in the case of systems with the smectic A- smectic C transition, a relation between the steepness of this variation, ne…
We present new experimental results on second-harmonic generation in highly conjugated organic molecules and molecular crystals recently developed in our group, as well as on electro-optic eftects in thin-film polymers. A large value of the molecular hyperpolarizability of a new hydrazone-type molecule crystallizing i…
A detailed model for the operation of a flow type atomic layer deposition (ALD) reactor is developed and tested with the growth of tantalum pentoxide thin films. The model incorporates evaporation, diffusion, and convection phenomena in mass transport and a kinetic description of the surface reactions and film growth.…
One of the most commonly overlooked parameters in grain boundary engineering initiatives is solute-interface interactions involving solute concentrations typically in the ppm range. In this work, experimental evidence is presented that demonstrates the significant effect of such interactions upon (1) the specific prop…
The solubility of sulphamethoxypyridazine was measured at several temperatures in mixtures of water:ethanol and ethanol:ethyl acetate. Sulphamethoxypyridazine was chosen as a model drug to compare the solvation effects of proton donor-proton acceptor (water and ethanol) and proton acceptor (ethyl acetate) solvents and…
Since zirconium (Zr) has superior corrosion resistance to concentrated nitric acid (HNO 3 ) at elevated temperature, it has been successfully used as a material for chemical plants to produce HNO 3 or spent nuclear fuel reprocessing plants. However, the occurrence of stress corrosion cracking (SCC) has recently been r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSoluble Polyimides with Polyalicyclic Structure. 4. Colorless Polyimides from Bicyclo[2.2.1]heptane-2-endo,3-endo,5-exo,6-exo-tetracarboxylic 2,3:5,6-DianhydrideToshihiko Matsumoto and Toshikazu KurosakiCite this: Macromolecules 1995, 28, 16, 5684–5685Publication Date (Print…
The existence of low-frequency, almost dispersionless intrinsic resonant vibrational modes in a transition layer at clean interface between two media (a rigid and a soft crystal) with very different elastic properties is predicted. It is shown that nonlinear interaction of bulk acoustic phonons with fluctuation resona…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Characterization, and in Vitro Degradation of a Novel Thermotropic Ternary Copolyester Based on p-Hydroxybenzoic Acid, Glycolic Acid, and p-Hydroxycinnamic AcidXiaoming Jin, Cosimo Carfagna, Luigi Nicolais, and Rosa LanzettaCite this: Macromolecules 1995, 28, 14,…
Abstract The structure of cellulose is investigated using a recently derived force field. Published experimental data is taken only as a starting point for purely theoretical investigations. The reliability of the method is validated by calculating physical properties of the obtained geometries. In the course of the i…
Recombinant Escherichia coli fadR atoC(Con) mutants containing the polyhydroxyalkanoate (PHA) biosynthesis genes from Alcaligenes eutrophus are able to incorporate significant levels of 3-hydroxyvalerate (3HV) into the copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)]. We have used E. coli fadR (F…
This paper will examine some of the changes that have occurred in epoxy resins and their chemistry and will explore the effect of these changes on electrical insulation. The intent is to present the chemistry in a fashion that will aid insulation designers in compiling their systems and manufacturing processes and wil…