Materials Literature
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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…
Several lithotypes used in diverse Andalusian monuments have undergone laboratory experiments of salt crystallization and within controlled environments. The indicators of deterioration that appear are justified from the point of view of the type of experiment and the lithotype, and compared with those found in the mo…
Samples of asbestos-cement pipe used for drinking water conveyance, were submerged in distilled water, and subjected to two controlled erosive treatments, namely agitation (300 rpm for 60 min) and ultrasound (47 kHz for 30 min). SEM was used to observe and compare the morphology of the new pipe with and without erosiv…
This study presents the results of a series of concrete test pieces of three different mixtures: I/45A cement; Portland cement with additions; Portland with fly ash. All were subjected to six different types of curing, with the aim of studying the evolution of their compressive strengths in terms of the grade of "matu…
At the present paper, it shows how has been studied the influence over the quality of a special sort of gypsum, when it has been added as "additive" 0,96% of potasium chlorurus (Kcl), it has been observed the variation on the mechanical proprieties and also over the time of the beginning and end of the set. Also with…
We describe the development of the scanning photoemission spectromicroscope MAXIMUM at the Wisoncsin Synchrotron Radiation Center, which uses radiation from a 30-period undulator. The article includes a discussion of the first tests after the initial commissioning.