Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Functional Mimic of the New Class of Tungstoenzyme, Acetylene HydrataseJyoti Yadav, Samar K. Das, and Sabyasachi SarkarView Author Information Department of Chemistry Indian Institute of Technology Kanpur Kanpur-208016, IndiaCite this: J. Am. Chem. Soc. 1997, 119, 18…
The polarization behaviors of porous samaria‐doped ceria anodes coupled with zirconia electrolytes with various ionic conductivities (σ ion ) were investigated. The exchange current density, j 0 , on such mixed‐conducting SDC anodes was not influenced by the σ ion at 900 and 1000°C, whereas j 0 increased proportionall…
Zirconia-modified silica and alumina samples were prepared by the atomic layer epitaxy technique using successive saturating reactions of ZrCl 4 and H 2 O vapors. The growth of ZrO 2 was followed by X-ray diffraction, diffuse reflectance IR Fourier transform spectroscopy, and 1 H magic angle spinning NMR measurements.…
The stable ternary system H 3 PO 4 ‐Ca(OH) 2 ‐H 2 O has been established further by determining the equilibria among the acidic calcium phosphates. In particular, equilibria involving CaHPO 4 ·2H 2 O, CaHPO 4 , Ca(H 2 PO 4 ) 2 ·H 2 O, and Ca(H 2 PO 4 ) 2 ·H 2 O have been established. In contrast to earlier opinions, C…
Two types of experiments on metastable pitting are carried out in NaCl solutions, one with galvanically coupled Al‐2% Cu and the second with 316L stainless steel under potentiostat control; the time dependence of the current is compared to simulated time series developed from the model of Part I of these two papers. T…
The structural basis for the dual specificity of the malonyl-CoA/acetyl-CoA:acyl carrier protein S-acyltransferase associated with the multifunctional animal fatty acid synthase has been investigated by mutagenesis. Arginine 606, which is positionally conserved in the transacylase domains of all multifunctional fatty…
Passivated and unpassivated Al single-crystal lines with (110), (133), and (111) planes parallel to the substrate have been fabricated and electromigration tests have been performed to study transgranular failure mechanisms. Both erosion voids and slitlike voids with {111} facets were observed in single-crystal lines.…
Abstract The structural collapse of mesoporous molecular sieves MCM-48 and MCM-41 materials by mechanical compression was found to occur mechanochemically through the hydrolysis of Si-O-Si bonds. Their ordered structures were well retained by compressing the samples under dry N2.
A novel method of determining the cell thickness and the twist angle of twisted nematic liquid crystal (TNLC) cells by measurement of the Stokes parameters of light transmitted through the cell is presented. The relationships of the Stokes parameters of transmission light to the cell thickness and the twist angle are…
A stochastic model for localized corrosion is investigated both analytically and numerically. A feature of the model is that each metastable pitting event can influence subsequent events, although the influence of an individual event decays with time. The model describes an abrupt, cooperative transition from metastab…
Thin sol−gel films including rhodamine B (RB) which were dip-coated using the sol−gel reaction of tetraethyl orthosilicate have been prepared as a function of time after mixing of the reaction systems. The absorption and fluorescence spectra of the individual thin films have been observed as a function of time after t…
Eight amorphous polyethers and poly(ether ketones) were synthesized and characterized by gel permeation chromatography, thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical thermal analysis. Polymers containing bulky, cyclic 2,2‘-biphenyl side groups were found to have the highest glas…
Collagen-based implants have been described as vehicles for transplantation of cultured skin cells for treatment of burn wounds. To optimize vascularization and repair of connective tissue, collagen solubility and glutaraldehyde crosslinking were evaluated. Cultured skin substitutes consisted of human keratinocytes an…
The synthesis and mesogenic properties of a new class of liquid crystalline metal-free and metalated phthalocyanines with different numbers of alkylthio side chains are presented. The effect of the substitution pattern in a series of differently octasubstituted phthalocyanines on the width and order of the thermotropi…
The efficiency of the nonhydrolytic sol−gel process based on the condensation between metal chlorides and metal alkoxides has been studied in the preparation of aluminum titanate gels. Solutions of aluminum and titanium precursors in the ratio Al/Ti = 2 gave gels with the same metal ratio. The structural evolution of…
Random porous silicon dielectric multilayers are proposed as interesting materials for applications as optical components. Distributed Bragg reflectors and interferential Fabry - Pérot filters are demonstrated. The randomness is obtained as a variation in the layer thicknesses. The advantage in the use of random inste…
Abstract Surface barriers, designed to limit recharge and biointrusion, have been identified as a critical component in long‐term management of buried wastes. However, surface barrier technology remains largely unproven at the field scale. Recently, a prototype of a field‐scale (2.5 ha), vegetated, capillary surface b…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStopped-Flow Photo-CIDNP Observation of Protein FoldingP. J. Hore, Stephen L. Winder, Claire H. Roberts, and Christopher M. DobsonView Author Information Oxford Centre for Molecular Sciences Physical and Theoretical Chemistry Laboratory and New Chemistry Laboratory, Un…
We have used magic‐angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy to examine the polyhedral arrangements in ternary lanthanum aluminoborate glasses. We have characterized two glass‐forming series: x Al 2 O 3 ·(1− x )LaB 3 O 6 and 0.25La 2 O 3 · y Al 2 O 3 (1− y )‐B 2 O 3 . 11 B MAS NMR reve…
Cellulose and its chemical analogs chitin and chitosan are abundant and technologically important fibrous polysaccharides. Cellulose and chitin are, respectively, the first [1] and second [2] most abundant natural polysaccharides. Chitosan, though less prevalent in nature, is a useful and easily accessible derivative…