Materials Literature
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The electrical impedance measured at p‐type and highly doped n‐type Si electrodes in solutions in the potential range of pore formation has been interpreted using a basic model. This model includes two electrochemical reactions (hole capture and electron injection) followed by a chemical oxidation reaction, and accoun…
Using Variational Density Functional Perturbation Theory, the dielectric and effective charge tensors of cubic Barium Titanate have been calculated as second derivatives of the total energy with respect to electric field and phonon perturbations. We found a dielectric constant εoo=5.60 and the following effective char…
A new more complete theory for energy exchange processes in electron emission is formulated. It is found that the tunneling contribution to the availability of vacant states is necessary to explain the replacement process occurring in the emitter region. The introduction of the tunneling states now makes it possible t…
Bright visible fluorescence was emitted from Er 3+ -doped halide phosphors and ErX 3 (X=Br, I), under 1.5 µm laser diode (5 mW) excitation. While green fluorescence was predominant with chloride ( BaCl 2 :Er) and bromide ( YBr 3 :Er), yellowish fluorescence was observed with iodide ( YI 3 :Er) and fluoride ( YF 3 :Er)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight Scattering Studies of Block Ionomer Aggregation Characteristics in Nonpolar SolventZukang Zhou, Dennis G. Peiffer, and Benjamin ChuCite this: Macromolecules 1994, 27, 6, 1428–1433Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSAXS Measurements of Interfacial Thickness in Amorphous Polymer Blends Containing a Diblock CopolymerPatrick Perrin and Robert E. Prud'hommeCite this: Macromolecules 1994, 27, 7, 1852–1860Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Pub…
Abstract Adsorption isotherms of organic pollutants such as aniline on soil colloidal materials have generally not been described for a wide range of solution concentrations. The characteristics of isotherms for aniline adsorption on Ca‐saturated kaolinite, montmorillonite, vermiculite, and an organic soil were determ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR Spectroscopy, Electron Spin Distribution, and Valence State of Pentacoordinate Manganese Tetraphenylporphyrin ComplexesPeter Turner and Maxwell J. GunterCite this: Inorg. Chem. 1994, 33, 7, 1406–1415Publication Date (Print):March 1, 1994Publication History Publ…
A novel technique to measure the two-dimensional (2-D) thickness profile of a nonuniform, thin film, from several nanometers to several micrometers, in a steady state as well as in a transient state has been developed and tested. Image scanning ellipsometry (ISE) is a full-field imaging technique that one can use to s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Studies of Copper(II)-Chelated Polymers Derived from Hydroxy-Functionalized Liquid Crystalline Homo- and CopolyazomethinesL. Oriol, P. J. Alonso, J. I. Martinez, M. Pinol, and J. L. SerranoCite this: Macromolecules 1994, 27, 7, 1869–1874Publication Date (Print):Ma…
<div class="htmlview paragraph">Intensive research and development activities which have been carried out by automotive manufacturers and suppliers of the automotive industry are currently focused on new solutions to meet the strict exhaust gas emission standards defined by LEV, ULEV and EG III. While both CO an…
Sodium borovanadate glasses have been investigated using infrared spectroscopy (IR) and magic angle spinning nuclear magnetic resonance (MAS NMR) studies. It is found that modification of borovanadate glass structure leads to the formation of tetrahedral boron and the ratio of tetrahedral $(B_4)$ to trigonal boron $(B…
We have investigated the fragmentation of gallstones using the pulsed Ho:YAG laser, comparing it to lithotripsy using the visible pulsed-dye laser. We find that the physical mechanisms of stone fragmentation appear to be quite different in the two cases. Using high-speed photography, measurement of acoustic transients…
Mixed solutions of Ca(NO 3 ) 2 and (NH 4 ) 2 HPO 4 with Ca/P = 1.50 were spray‐pyrolyzed at 600°C to produce β‐calcium orthophosphate (β‐Ca 3 (PO 4 ) 2 ) powder; the spray‐pyrolyzed powder was ground and then calcined at 600°C for 1 h. The best crystalline β‐Ca 3 (PO 4 ) 2 powder was obtained from the solution with 1.…
Abstract An approach to reproduce the solubility profile of a drug in several solvent mixtures showing two solubility maxima is proposed in this work. The solubility of sulphamethoxypyridazine was determined at 25°C in several mixtures of varying polarity (hexane: ethyl acetate, ethyl acetate:ethanol and ethanol: wate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBacterial production of poly(.beta.-hydroxyalkanoates) containing unsaturated repeating units by Rhodospirillum rubrumHerbert W. Ulmer, Richard A. Gross, Mario Posada, Paul Weisbach, R. Clinton Fuller, and Robert W. LenzCite this: Macromolecules 1994, 27, 7, 1675–1679Publica…
The mechanical behavior of three CVT‐processed 2D woven SiC/BN/SiC composite materials with different initial BN interphase thicknesses has been investigated by means of tensile and impact tests. The results have established the efficiency of a BN interphase in promoting a nonlinear/non–catastrophic tensile behavior a…
In order to gain insight into the degradation mechanisms associated with ferroelectric thin films, such as fatigue and imprint, an understanding of the defect chemistry and transport properties of the material is needed. In this study several complimentary techniques have been used to either measure or calculate indir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetically Coupled Molecular System Composed of Organic Radicals with Different Spin MultiplicitiesAkira Izuoka, Masanori Fukada, Reiji Kumai, Mitsuhiro Itakura, Shinobu Hikami, and Tadashi SugawaraCite this: J. Am. Chem. Soc. 1994, 116, 6, 2609–2610Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAMTeS3 (A = K, Rb, Cs; M = Cu, Ag): A New Class of Compounds Based on a New Polychalcogenide Anion, TeS32-Xiang Zhang and Mercouri G. KanatzidisCite this: J. Am. Chem. Soc. 1994, 116, 5, 1890–1898Publication Date (Print):March 1, 1994Publication History Published online1 May…