Materials Literature
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Extant theories for nucleation and growth of crystals in molecular systems are adapted to colloidal dispersions and used to compare observations for charged spheres at low ionic strengths; soft, polymerically stabilized spheres: and hard spheres.
Abstract The transport properties of silicone rubber are reported at 35°C for a series of pure gases (He, N 2 , CH 4 , CO 2 , and C 2 H 4 ) and gas mixtures (CO 2 /CH 4 and N 2 /CO 2 ) for pressures up to 60 atm. The effects of pressure and concentration on the permeability of various gases have been analyzed to consi…
The grain‐boundary chemistry of magnesium aluminate spinel solid solutions MgO· n Al 2 O 3 in which grain growth measurements were reported in part I has been investigated in order to understand the mechanism of grain‐boundary migration. It is found that although segregation of impurity Ca and Si is common, much large…
ABSTRACT Surface response modeling was used to characterize the effect of extrusion processing on the functional properties of corn fiber/corn starch formulations. Process parameters evaluated included screw speed (200‐500 rpm), temperature (90‐150°C) and pH (3‐11). Generally, the water holding capacity of starch incr…
Optical microscopy, X-ray diffraction and NMR spectroscopy have been used to examine whether the hexagonal phases of representative chromonic and amphiphilic mesogens are miscible. The systems studied were octaoxyethylene-glycol dodecylether with either disodium cromoglycate or 5-n-hexyl-7-(5-methyl-sulphonimidoyl) xa…
Third-order optical nonlinearities have been evaluated for organic materials in powder, solution, and film forms, by third-harmonic generation (THG) measurement. Considerations of the effects of THG interference between film sample and substrate, and of the effect of THG in air, are made for an accurate x(3) evaluatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic studies of the photochromic molecule N-(2-hydroxybenzylidene)aniline and its photoproductWayne. Turbeville and Prabir K. DuttaCite this: J. Phys. Chem. 1990, 94, 10, 4060–4066Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Publ…
Global damage indices based on equivalent modal parameters are defined using the vibrational parameters of an equivalent linear structure. In continuum mechanics‐based damage models, effects of the growth and coalescence of microcracks are accounted for through the definition of an internal or local damage variable. D…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, luminescence, and excited-state complexes of the tris(1,10-phenanthroline)- and bis(terpyridine)iridium(III) cationsN. P. Ayala, C. M. Flynn Jr., LouAnn Sacksteder, J. N. Demas, and B. A. DeGraffCite this: J. Am. Chem. Soc. 1990, 112, 10, 3837–3844Publication Date…
The fracture‐toughness‐determining mechanism of silicon carbide with additions of yttria and alumina was studied. Observations of indentation crack profiles revealed that significant crack deflection had occurred. Median deflection angles increased with increased volume fractions of the second phases, which was accomp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiodegradable film derived from chitosan and homogenized celluloseJun Hosokawa, Masashi Nishiyama, Kazutoshi Yoshihara, and Takamasa KuboCite this: Ind. Eng. Chem. Res. 1990, 29, 5, 800–805Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Publ…
Rylenes are annelated arenes derived formally by coupling all the peri-positions of naphthalene. Several soluble oligorylenes have now been synthesized as models for “polyrylene” 1. R = H. Among the most striking features to emerge in the course of characterizing the compounds were a small HOMO/ LUMO energy gap for th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh turnover rates in pH-dependent alkene epoxidation using NaOCl and square-planar nickel(II) catalystsHeungsik Yoon, Thomas R. Wagler, Kenneth J. O'Connor, and Cynthia J. BurrowsCite this: J. Am. Chem. Soc. 1990, 112, 11, 4568–4570Publication Date (Print):May 1, 1990Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLong-lived nonmetallic silver clusters in aqueous solution: a pulse radiolysis study of their formationPaul. Mulvaney and Arnim. HengleinCite this: J. Phys. Chem. 1990, 94, 10, 4182–4188Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Publish…
Studies of the interaction of oxygen with some transition metal surfaces are limited by activation barriers to adsorption and reaction of O2. These barriers can be surmounted by using oxidants more powerful than O2 to chemisorb oxygen on these surfaces under ultrahigh vacuum (UHV) conditions, but at high ‘‘effective’’…
BaTiO 3 modified with grain‐boundary resident ZrO 2 (≤ 2 wt%) results in substantial chemical modification of the microstructure when sintered at 1320°C for 2 h. These modified regions were seen as core‐shell grains in the micro‐structure and were accompanied by an increase in the internal stress level. The shells had…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Y. Hirooka, R. W. Conn, T. Sketchley, W. K. Leung, G. Chevalier, R. Doerner, J. Elverum, D. M. Go…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxazoline having a coumarin moiety as a pendant group. Synthesis and photogelationYoshiki Chujo, Kazuki Sada, and Takeo SaegusaCite this: Macromolecules 1990, 23, 10, 2693–2697Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published ini…
We have investigated reaction‐forming of silicon carbide by the infiltration of carbonaceous preforms using alloyed silicon melts, in order to synthesize composite materials free of the residual silicon phase that has previously limited mechanical properties and upper use temperatures. In this approach, rejection of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(aryl ether-benzoxazoles)J. G. Hilborn, J. W. Labadie, and James L. HedrickCite this: Macromolecules 1990, 23, 11, 2854–2861Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pubs.acs.org/doi/10.1021/ma00…