Materials Literature
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The catalytic reaction CO(a)+O(a)→CO2(g) has been studied on Pt(335) using infrared reflection absorption spectroscopy (IRAS) and temperature programmed reaction (TPR) methods. Both dissociative O2 adsorption and CO adsorption occur preferentially on the step sites. It has been found that chemisorbed CO on the (111) t…
We consider the problem of nonlinear thermal-solutal convection in the mushy zone accompanying unstable directional solidification of binary systems. Attention is focused on possible nonlinear mechanisms of chimney formation leading to the occurrence of freckles in solid castings, and in particular the coupling betwee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of aromatic amines with hydrogen peroxide catalyzed by cetylpyridinium heteropolyoxometalatesSigeki Sakaue, Takashi Tsubakino, Yutaka Nishiyama, and Yasutaka IshiiCite this: J. Org. Chem. 1993, 58, 14, 3633–3638Publication Date (Print):July 1, 1993Publication Histo…
β‐Si 3 N 4 powder containing 1 mol% of equimolar Y 2 O 3 –Nd 2 O 3 was gas‐pressure sintered at 2000°C for 2 h (SN2), 4 h (SN4), and 8 h (SN8) in 30‐MPa nitrogen gas. These materials had a microstructure of “ in‐situ composites” as a result of exaggerated grain growth of some β Si 3 N 4 grains during firing. Growth of…
Zirconia–ceria solid solutions of tetragonal symmetry ( t ’ZrO 2 ) containing 30 to 65 mol% ceria were prepared by annealing c ′‐ZrO 2 at 627°C samples sintered at 1660–1760°C, where c ′‐ZrO 2 is defined as a cubic or tetragonal phase whose axial ratio c/a (tetragonality) is equal to 1. The lattice parameters and the…
Zn 2 − x Mn x SiO 4 is an efficient phosphor for plasma display panels. However, it is not usable for TV applications because of its too long decay around 30 ms. In this study, we have investigated the decrease of the decay time of Zn 2 − x Mn x SiO 4 phosphors synthesized by solid‐state reaction. Photoluminescence de…
Abstract This work has reviewed and summarized the present understanding of the fundamental science and chemistry of rubber vulcanization. The future of this area holds much potential. Recent studies have begun to fully elucidate the accelerator and accelerator complex chemistry, and definitively answer questions that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-valent transition metal chemistry. Moessbauer and EPR studies of high-spin (S = 2) iron(IV) and intermediate-spin (S = 3/2) iron(III) complexes with a macrocyclic tetraamido-N ligandKimberly L. Kostka, Brian G. Fox, Michael P. Hendrich, Terrence J. Collins, Clifton E. F…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of a tetraaryldialane to generate aluminum-aluminum .pi.-bondingRudolf J. Wehmschulte, Karin Ruhlandt-Senge, Marilyn M. Olmstead, Hakon Hope, Bradley E. Sturgeon, and Philip P. PowerCite this: Inorg. Chem. 1993, 32, 14, 2983–2984Publication Date (Print):July 1, 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkylene-bridged silsesquioxane sol-gel synthesis and xerogel characterization. Molecular requirements for porosityHenry W. Oviatt, Jr., Kenneth J. Shea, and James H. SmallCite this: Chem. Mater. 1993, 5, 7, 943–950Publication Date (Print):July 1, 1993Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrin based self-assembled monolayer thin films: synthesis and characterizationDeQuan Li, Basil I. Swanson, Jeanne M. Robinson, and Mark A. HoffbauerCite this: J. Am. Chem. Soc. 1993, 115, 15, 6975–6980Publication Date (Print):July 1, 1993Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural transformation of zirconia aerogelsDavid A. Ward and Edmond I. KoCite this: Chem. Mater. 1993, 5, 7, 956–969Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.org/doi/10.10…
Abstract The interfacial tension, phase morphology, and phase growth was determined for four polymer blend systems: polyethylene/polystyrene, polyethylene/polyamide‐6, polystyrene/polyamide‐6, and polystyrene/poly(ethylene terephthalate). Generally, high interfacial tension correlates with coarse phase morphology and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiple percolation in conducting polymer blendsKalle Levon, Alla Margolina, and Alexander Z. PatashinskyCite this: Macromolecules 1993, 26, 15, 4061–4063Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(vinyl acetate)/silica-filled materials: material properties of in situ vs fumed silica particlesChristine J. T. Landry, Bradley K. Coltrain, Michael R. Landry, John J. Fitzgerald, and Victoria K. LongCite this: Macromolecules 1993, 26, 14, 3702–3712Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn approach to the design of molecular solids. Strategies for controlling the assembly of molecules into two-dimensional layered structuresYuh Loo Chang, Mary Ann West, Frank W. Fowler, and Joseph W. LauherCite this: J. Am. Chem. Soc. 1993, 115, 14, 5991–6000Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and defects in fully syndiotactic polypropyleneAndrew J. Lovinger, Bernard Lotz, Don D. Davis, and F. J. Padden Jr.Cite this: Macromolecules 1993, 26, 14, 3494–3503Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue…
Sub-micrometer-sized particles of poly(L-lactic acid) may be formed by using near-critical or supercritical carbon dioxide as an antisolvent to precipitate poly(L-lactic acid) from droplets of methylene chloride solution sprayed into a carbon dioxide continuous phase. Particle sizes may be controlled by varying the de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimensionality of manganese(II)-copper(II) bimetallic compounds and design of molecular-based magnetsHumberto O. Stumpf, Yu Pei, Olivier Kahn, Jorunn Sletten, and Jean Pierre RenardCite this: J. Am. Chem. Soc. 1993, 115, 15, 6738–6745Publication Date (Print):July 1, 1993Publ…
The production of OH radicals by dissociation of water vapor in oscillating argon bubbles is studied theoretically to examine a possible mechanism for the emission of the 310-nm line observed in sonoluminescence experiments. Accurate models are used for the calculation of the temperature field in the gas and for the d…