Materials Literature
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The coupling of the Stefan equation for the heat flow with the Gibbs–Thomson law relating the melting temperature to the mean curvature of the phase interface is considered. Solutions, global in time, are constructed which satisfy the natural a priori estimates. Mathematically the main difficulty is to prove a certain…
Third‐order optical nonlinear susceptibilities (χ (3) ) of some high‐refractive‐index chalcogenide glasses were evaluated from third‐harmonic generation. Compared with oxide glasses whose χ (3) has been known, χ (3) of the present glasses was higher by an order of magnitude. The addition of selenium drastically increa…
The mechanism of partial discharge (PD) occurring in the CIGRE Method II (CM-II) electrode system, which is a representative closed-void model system is discussed in the context of a computer-aided PD measuring system. Measurements of PD are made for the CM-II electrode system. Effects of the pressure and gas inside t…
Abstract New aromatic polyamides (aramids) having inherent viscosities of 0.5–2.6 dL/g were prepared by the direct polycondensation of 4,4′‐diaminotriphenylamine with various aromatic dicarboxylic acids in N ‐methyl‐2‐pyrrolidone using triphenyl phosphite and pyridine as condensing agents. These aramids were amorphous…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation and expansion of dark spots in stratifying foam filmsP. Kralchevski, A. Nikolov, D. T. Wasan, and I. IvanovCite this: Langmuir 1990, 6, 6, 1180–1189Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 June 1990https…
Growth of collagen fibrils was examined in a system in which collagen monomers are generated by specific enzymic cleavage of type IpCcollagen with procollagen C-proteinase. Fibrils formed at 37 degrees C had highly tapered and symmetrical pointed tips. The pattern of cross-striations in the pointed tips indicated that…
Field effect transistors, schottky diodes, and solar cells are among the applications of organic semiconductors now being developed. Questions concerning charge generation and transport as well as doping mechanisms in these materials, which include polyacetylenes, polythiophenes and metallophthalocyanines are reviewed…
An acoustic backscattering technique for detecting transient cavitation produced by 10-microseconds-long pulses of 757-kHz ultrasound is described. The system employs 10-microseconds-long, 30-MHz center frequency tone bursts that scatter from cavitation microbubbles. Experiments were performed with suspensions of hydr…
Abstract In the study of microstructural evolution and macroscopic property changes due to radiation damage, the point defects are usually modelled as being produced continuously in time and uniformly in space. Furthermore, the excess of vacancies required to sustain the void growth is assumed to arise entirely due to…
The interaction between synthetic polymers and the natural environment in terms of the effects of oxygen, radiant energy, and living organisms has been extensively studied over the past two decades [1]. However, the recent trends in the preservation of the environment have created much public interest. This is due to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransformation of Valonia cellulose crystals by an alkaline hydrothermal treatmentJunji Sugiyama, Takeshi Okano, Hiroyuki Yamamoto, and Fumitaka HoriiCite this: Macromolecules 1990, 23, 12, 3196–3198Publication Date (Print):June 1, 1990Publication History Published online1 M…
We have studied by $^{29}\mathrm{Si}$ NMR the complete condensation kinetics in the conditions of rapid hydrolysis (acidic medium, water in excess) of three silicon alkoxides. The gelation of the tetravalent tetraethoxysilane (TEOS) takes several weeks, whereas the trivalent methyltriethoxysilane (MTEOS) and vinyltrie…
Abstract The development of composites consisting of wood fibers and recycled plastics offers not only an opportunity to utilize an abundant natural resource but also a means to alleviate the serious plastics disposal problem. In this work, aspen fibers are incorporated into recycled high density polyethylene with a c…
Foreword. List of abbreviations. Introduction. Reactor materials and fission products. Data assessment. Construction of the tables. Fundamental constants. Nomenclature and symbols. References. Americium. Barium. Boron. Caesium. Europium. Hydrogen. Iodine. Krypton. Lanthanum. Molybdenum. Neodymium. Oxygen. Palladium. P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn attractive cis-effect of hydride on neighbor ligands: experimental and theoretical studies on the structure and intramolecular rearrangements of Fe(H)2(.eta.2-H2)(PEtPh2)3Lori S. Van der Sluys, Juergen Eckert, Odile Eisenstein, John H. Hall, John C. Huffman, Sarah A. Jack…
Piezoelectric properties of bismuth sodium titanate, (Bi1/2Na1/2)TiO3 (BNT)-based solid solution, (Bi1/2Na1/2)(1−x)(St a Pb b Ca c ) x TiO3(a+b+c=1)(BNTX [100x−100a/100b/100c]), are studied as a new substrate material group of lead- free or low lead content piezoelectric ceramics. A rhombohedral (Fα)-tetragonal (Fβ) m…
The mechanism by which alcohol washing of ceramic powders produces “soft” agglomerates has been investigated by studying the interaction of ethanol with hydrous ZrO 2 powders using Fourier transform infrared (FTIR) spectroscopy. Unambiguous evidence of ethoxide formation has been found, which apparently prevents bond…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew route to layered double hydroxides intercalated by organic anions: precursors to polyoxometalate-pillared derivativesEmmanuel D. Dimotakis and Thomas J. PinnavaiaCite this: Inorg. Chem. 1990, 29, 13, 2393–2394Publication Date (Print):June 1, 1990Publication History Publi…
We studied the optical transient bleaching of ∼40 Å, ammonia-passivated CdS clusters in a polymer with nanosecond and picosecond pump-probe techniques. The transient bleaching spectra behave differently in different time regimes. Within the 30-ps pump laser pulse width, we tentatively attribute the bleaching to the ex…