Materials Literature
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Surface modification of two Teflon polymers, PFA (tetrafluoroethylene and perfluoroalkoxyvinyl ether copolymer) and PTFE (polytetrafluoroethylene), induced by argon plasma treatment using a radio frequency generator and subsequent air exposure has been investigated by x-ray photoelectron spectroscopy (XPS) and electro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of squaraine dyes. 1. Excited singlet, triplet, and redox states of bis[4-(dimethylamino)phenyl]squaraine and bis[4-(dimethylamino)-2-hydroxyphenyl]squarainePrashant V. Kamat, Suresh Das, K. George Thomas, and Manapurathu V. GeorgeCite this: J. Phys. Chem. 199…
Foreword. Relaxation Processes. Relaxation processes in small particles (A. Aharoni). Theoretical point of view on relaxation in small particles (A.M. Afanas'ev). Relaxation rate of fine magnetic particles (L. Bessais et al.). Static and dynamic study of fine particles by neutron scattering (M. Hennion et al.) Prepara…
Abstract Lime mud in northern Belize lagoon is composed predominantly of silt-size cryptocrystalline grains and clay-size clumps, both of which consist of anhedral, equant crystals less than 0.5 mu m in size. This mud is 70-90% Mg-calcite containing 9-10 mole % MgCO 3 . Detailed petrographic, morphologic and mineralog…
The stereoselective synthesis of various 1,8-disubstituted derivatives of 1,4,8,11-tetraazacyclotetradecane (cyclam) has been achieved and copper and nickel complexes prepared. For the 1,8-dibutyl derivative, the square-planar nickel(II) complex exists as two diastereoisomers, as revealed by crystallographic analysis.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic analysis of ordering and phase-separation behavior of model polyurethanes in a restricted geometryCurtis W. Meuse, Xiaozhen Yang, Decai Yang, and Shaw L. HsuCite this: Macromolecules 1992, 25, 2, 925–932Publication Date (Print):January 1, 1992Publication Histor…
Two series of La1–xSrxNiO3–λ and La1–1.333xThxNiO3–λ catalysts have been prepared, and the relationships between the solid defect structure and catalytic activity for NH3 oxidation were measured. The results showed that in the range of x < 0.3, the samples possessed single perovskite-type structure, and as the content…
To understand how albumin on the surface inhibits surface-induced platelet activation, we adsorbed albumin on dimethyldichlorosilane-coated glass (DDS-glass) and modified the adsorbed albumin by three different methods. The adsorbed albumin was crosslinked with glutaraldehyde, dried and rehydrated, or digested with tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnnealing of silicon clustersMartin F. Jarrold and Eric C. HoneaCite this: J. Am. Chem. Soc. 1992, 114, 2, 459–464Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ja00028a01…
A method is described to graft conducting polyaniline onto glass fabric, glass wool and nylon cloth to impart flexibility and mechanical strength to the polyaniline, which is otherwise powdery and untracable. These flexible conductive surfaces can find application as antistatic shields.
The precipitation of copper(II) hydrous oxides and basic salts from solutions that became homogeneously alkaline by forced hydrolysis of urea has been studied as a function of solution composition, ageing time and temperature. The time required for the onset of precipitation increased with the initial copper(II) conce…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTPhotoinduced electron-transfer reactions of porphyrin heteroaggregates: energy gap dependence of an intradimer charge recombination processHiroshi Segawa, Chie Takehara, Kenichi Honda, Takeo Shimidzu, Tsuyoshi Asahi, and Noboru MatagaCite this: J. Phys. Chem. 1992, 96, 2, 503–50…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of the xenon-adsorption method for the study of metal cluster formation and growth on Y zeoliteRyong Ryoo, Sung June Cho, Chanho Pak, Jeong Guk Kim, Son Ki Ihm, and Jeong Yong LeeCite this: J. Am. Chem. Soc. 1992, 114, 1, 76–82Publication Date (Print):January 1,…
The composition, the structure, and some physical properties of boron–carbon–nitrogen solid solutions prepared by chemical vapor deposition (CVD) have been investigated. Both crystalline films and amorphous granular materials resulting respectively from heterogeneous and homogeneous nucleation were characterized by X‐…
A simple bend stress relaxation (BSR) test has been developed to measure the creep‐related deformation properties of ceramic fibers and whiskers. The test was applied to a variety of commercial and developmental Si‐based fibers to demonstrate test capabilities and to qualitatively evaluate the relative creep resistanc…
Electron localization and optical transmission in one-dimensional systems with two components distributed according to the Rudin-Shapiro sequence are investigated. The nature of the eigenstates in the diagonal tight-binding model is studied by making use of nonlinear recurrence relations satisfied by the associated tr…
Free‐end torsion tests were carried out on polycrystalline copper samples at room temperature, 125°C, 200°C and 300°C. The lengths of the samples increased at room temperature and 125°C, but increased and then decreased at 200°C and 300°C. Pole figures were measured on these samples at increasing shear strains up to γ…
A copper–cerium oxide sample prepared with an atomic ratio, Cu : Ce, of 0.01 has been studied by electron paramagnetic resonance (EPR) spectroscopy. A well resolved spectrum of copper(II) ion pairs has been evidenced and the hyperfine structure of the perpendicular components clearly appears. The high resolution can b…
Abstract The objective of this chapter is to acquaint the reader with the molecular concepts of clay-water interactions that are pertinent for understanding the hydration, swelling, and rheological behavior of clays. In this regard, the topics of special importance are colloidal characteristics of the clay particles,…
The successive displacement of plasma proteins adsorbed to artificial surfaces (biomaterials) is well documented, mostly by specially designed experiments that stretch out the effect in time and space. Analysis of displacement has been focused principally on molecular events on the adsorbing surface. In this paper att…