Materials Literature
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Abstract The control of crystal formation has been developed to a remarkable degree by many organisms. Oriented nucleation, control over crystal morphology, formation of unique composites of proteins and single crystals, and the production of ordered multicrystal arrays, are all well within the realm of biological cap…
The stabililty of conducting polymerss is enhanced by the presence in the doped polymer structure of substituents which are able to stabilize prositive charge while having only minor steric effects. The insufficient stability of conducting poplymers has greatly hindered their wide application but the title compounds h…
A penetration mechanics database has been compiled that contains experimental results from a variety of researchers of different nationalities (German, French, English, Canadian, and American), during different decades (the 1960's to the 1990's), and with different purposes or objectives (space debris impact, armor de…
The structure of a silicate liquid changes with temperature, and this substantially affects its thermodynamic and transport properties. Models used by geochemists, geophysicists, and glass scientists need to include such effects. In situ, high-temperature nuclear magnetic resonance (NMR) spectroscopy on (23)Na, (27)A1…
This book is devoted to the main aspects of the physics of recombination in semiconductors. It is the first book to deal exclusively and comprehensively with the subject, and as such is a self-contained volume, introducing the concepts and mechanisms of recombination from a fundamental point of view. Professor Landsbe…
X-ray photoelectron spectroscopy (XPS) was used to determine changes in titanium oxide composition, oxide stoichiometry, and adsorbed surface species as a function of exposure to model physiologic environments. The oxide on titanium became heterogeneous and polarized as a function of exposure. Changes included an incr…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Electronic distributions of various symmetries have been investigated for both valence and conduction bands in a series of Al-Mn and Al-Mn-Si alloys of different structural states (amorphous, quasi-crystalline or crystalline) and Mn concentrations ranging from 14 to 22 at.%. Experiments have been carried out by means…
Nd 2 Fe 14 B permanent magnets with different load lines were irradiated with 20 MeV protons at temperatures between 300 and 15 K, and the flux loss was measured as a function of the irradiation temperature. The results show that the magnetic flux loss depends drastically on temperature and on the shape of the sample.…
X-ray scattering studies on aligned films of binary mixtures of the normal alkanes ${\mathrm{C}}_{23}$${\mathrm{H}}_{48}$ and ${\mathrm{C}}_{28}$${\mathrm{H}}_{58}$ reveal, for the first time in such materials, the existence of a new equilibrium phase having the symmetry of a smectic crystal, possibly a hexatic. This…
Abstract Olefinic double bounds of a model styrene–isoprene diblock copolymer were hydrogenated using diimide (generated by a thermal decomposition of p ‐toluenesulfonyl hydrazide). The presence of byproducts and/or main‐chain structural alterations (e.g., degradation or cross‐linking), as a possible side effect of th…
Abstract In this article we consider characterization of the branching distribution of LLDPE by analytical TREF and by DSC techniques. Qualitatively, both methods yield parallel information, provided that the DSC samples are prepared at very slow cooling rates. Analytical TREF provides more quantitative information, h…
Abstract Six kinds of polyimide films with different molecular structures were synthesized and carbonized up to 1100°C. The carbonization behavior of polyimides was followed by measuring the changes in weight, size, and electrical conductivity. Pyrolysis gases evolved on the way to carbonize up to 1000°C were analyzed…
The forward and reverse water-gas shift reactions have been studied in detail in our laboratory over clean Cu(111) and Cu(110) single-crystal surfaces, which serve as good kinetic models for high-area Cu/ZnO catalysts. We review here the results of those studies. The steady-state kinetics of these reactions have been…
Heterogeneous catalysis is an important part of the technology that supports industrially developed societies. Production of transportation fuels, pollution control, production of low-cost and high-quality raw materials are just some of the areas in which heterogeneous catalysis impacts. The Council on Competitiveness…
Control over crystal growth by acidic matrix macromolecules is an important process in the formation of many mineralized tissues. Earlier studies on the interactions between acidic macromolecules and carboxylate- and carbonate-containing crystals showed that the proteins recognize a specific stereochemical motif on th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-barrier hydrogen bonds and low fractionation factor bases in enzymic reactionsW. W. ClelandCite this: Biochemistry 1992, 31, 2, 317–319Publication Date (Print):January 21, 1992Publication History Published online1 May 2002Published inissue 21 January 1992https://pubs.acs…
The self-consistent theory of the structural, dynamical, and thermodynamic surface properties of anharmonic crystals previously given for one- and two-dimensional models is extended to the surfaces of three-dimensional crystals which take into account the surface anisotropy. After considering the reference system, in…
The temperature dependence of the lattice parameters in the beta -phase (BCC structure) of pure Zr and Zr-2 at.%Co was determined between 900 and 1550 degrees C by neutron diffraction. All diffraction patterns show a high diffuse background, which is identified as thermal diffuse scattering and originates from particu…
A microscopic model of liquid crystals, with frustrated dipolar, van der Waals, and benzene-ring steric hindrance interactions, yields reentrant phase diagrams with the sequence nematic--smectic-${\mathit{A}}_{\mathit{d}--}$nematic--smectic-${\mathit{A}}_{1--}$smectic-C. The Lindemann criterion of melting is adapted t…