Materials Literature
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Electrochemical impedance spectrum of a metal hydride electrode was interpreted by an equivalent circuit including a reaction resistance on the alloy surface, a contact resistance between the current collector and the pellet, one related to alloy particle‐to‐particle contact, and a Warburg impedance. According to the…
Stark effect modulation of the optical absorption spectrum of 40 Å diam CdSe nanocrystals show the first excited state of these clusters has a dipole moment of 32±10 D.
The results of a linear-elastic analysis to determine the phase angle at the tip of an interface crack in the peel test are presented in this paper. The phase angle is fairly insensitive to the peel angle and, when the film and substrate have identical elastic properties, the mode-I and mode-II components of the crack…
Cascade molecules (arborols, dendrimers) can form larger structures with defined shape by self-association. Such a “supramolecular automorphogenesis” takes place with the amphiphilic arborol 1, which gels in aqueous solutions, forming single- and multistranded aggregates. Helical structures were detected by electron m…
The characteristics of a magnetic Ericsson refrigeration cycle are investigated on the basis of the thermodynamic properties of the ferromagnetic material. The effect of field-dependent heat capacity on regeneration is discussed. The coefficients of performance of the Ericsson magnetic refrigeration cycle are derived.…
Three hydroxyribonucleosides catalyzing the oxido-reduction of NADH and K3F3(CN)6 were purified from Torula yeast RNA by a series of steps including sodium dodecyl sulfate/phenol extraction, nuclease P1 digestion, alkaline phosphatase digestion, anion-exchange chromatography, and high performance liquid chromatography…
We have been investigating the growth of crystalline titanium dioxide films at deposition temperature between room temperature and about 400 °C. The films were prepared by a dc magnetron reactive sputtering on glass and Si(100) substrates. The structural properties of the films were analyzed by x-ray diffractometry. T…
New determinations of the surface-tension-anisotropy parameter ${\mathrm{\ensuremath{\varepsilon}}}_{4}$ of succinonitrile (SCN), pivalic acid (PVA), and a PVA--1%-ethanol mixture are reported. Effects of temperature gradients and crystal orientation are analyzed in detail. The experiments utilized numerical interpola…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of organosilicon compounds. 293. Preparation, characterization, and crystal structures of octasilacubanes and octagermacubanesAkira Sekiguchi, Tetsuo Yatabe, Hirokazu Kamatani, Chizuko Kabuto, and Hideki SakuraiCite this: J. Am. Chem. Soc. 1992, 114, 15, 6260–6262P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-order optical nonlinearities of bis(phthalocyanines)James S. Shirk, J. R. Lindle, F. J. Bartoli, and Michael E. BoyleCite this: J. Phys. Chem. 1992, 96, 14, 5847–5852Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1…
The preparation, the electrical and rheological properties as well as the electrochemical behavior of gel electrolytes made of (PC) electrolyte mixed with poly(methylmethacrylate) polymer (PMMA) as a stiffener are described. The addition of PMMA in various proportions to (M)‐PC electrolyte considerably increases the v…
Passive films on stainless steels, which are known to exhibit a significantly different susceptibility to pitting corrosion (DIN 1.4301, 1.4439, 1.4529), were examined in situ by photoelectrochemistry. The results show that the photoresponse is determined by the defects in the electronic structure of the films leading…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilica-pillared derivatives of H+-magadiite, a crystalline hydrated silicaJames S. Dailey and Thomas J. PinnavaiaCite this: Chem. Mater. 1992, 4, 4, 855–863Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https:/…
Electron-matter interaction is described by a Monte Carlo procedure in which the mean free path is calculated by using a screened Rutherford formula, while energy loss is computed by using the Kanaya and Okayama semiempirical expression. Monte Carlo simulation results of the backscattering coefficient have been compar…
Abstract Compatibilization of polyamide 6/isotactic polypropylene blends was investigated by mechanical, morphological, thermal, and rheometrical methods. The primary objective was to obtain blends combining the desirable properties of the two components. Four compatibilizers including maleic anhydride, fumaric acid,…
The passive state of chromium has been examined in 1 M H 2 SO 4 by a variety of electrochemical techniques and x‐ray photoelectron spectroscopy. The potentiodynamic behavior of the passive electrode may be described by high‐field film growth kinetics. The passivating oxide film is 5–25 Å thick and consists of chromic…
To examine the mechanism of film deposition in a planar rf CH4 discharge plasma, measurements were made of the spatial distributions of the deposition rate and optical emission intensity along the discharge axis between parallel electrodes. Optical-absorption properties of the deposited carbon films were also measured…
The suitability of polymeric biomaterials as surfaces for the attachment and growth of cells has often been investigated in tissue culture. In this study the contribution that adsorption of serum fibronectin (Fn) or vitronectin (Vn) make to the attachment and spreading of fibroblast cells during the first 90 min follo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign of chromophoric molecular assemblies with large second-order optical nonlinearities. A theoretical analysis of the role of intermolecular interactionsSanto Di Bella, Mark A. Ratner, and Tobin J. MarksCite this: J. Am. Chem. Soc. 1992, 114, 14, 5842–5849Publication Dat…
Duplex (two‐phase) microstructures and laminar composites offer some unique opportunities for improving the room‐temperature mechanical reliability (e.g., flaw tolerance) and the high‐temperature microstructural stability (e.g., resistance to grain growth and creep damage) of structural ceramic materials. Examples ill…