Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo new .mu.-azido nickel(II) uniform chains: syntheses, structures, and magneto-structural correlationsAlbert Escuer, Ramon Vicente, Joan Ribas, M. Salah El Fallah, Xavier Solans, and M. Font-BardiaCite this: Inorg. Chem. 1993, 32, 17, 3727–3732Publication Date (Print):Augu…
Transition-state theory was employed to study the dynamics of light gases dissolved in rigid microstructures of glassy polycarbonate and rubbery polyisobutylene modeled in atomistic detail. The gaseous molecules migrated through the polymer structures in a sequence of ‘‘hops’’ between local minima of the potential ene…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of intermediate steps in the self-assembly of n-alkanethiols on gold surfaces by soft x-ray spectroscopyG. Haehner, C. Woell, M. Buck, and M. GrunzeCite this: Langmuir 1993, 9, 8, 1955–1958Publication Date (Print):August 1, 1993Publication History Published onl…
The quasiperiodic structure of decagonal Al 70 Ni 15 Co 15 was determined on the basis of X-ray single-crystal intensity data using the n-dimensional embeding method. Centrosymmetric five-dimensional space group P10 5 /mmc, three-dimensional reciprocal and direct quasilattice parameters: a i * =0.2636 (1) A -1 , i=1,.…
First- and third-order dynamic polarizabilities and hyperpolarizabilities of aza-cyanine and symmetric cyanine dyes have been computed exactly within the correlated Pariser–Parr–Pople model defined over the π framework. The exact nonlinearities of the model have been compared with those of polyenic systems. It is foun…
TiO 2 thin films were grown on sapphire substrates at 500°C by means of reactive ionized cluster beam (RICB) deposition. The TiO 2 thin films grown on sapphire (0001) and (112̄0) substrates were single-crystalline and had the rutile structure. The epitaxial orientation relationships between the rutile films and the sa…
A self-tuned magnetostrictive/piezoelectric hybrid Tonpilz transducer which produces enhanced motion at one end and canceled motion at the other is presented. The particular hybrid Tonpilz transducer described here consists of two 5.4 in. (13.65 cm) diameter circular pistons with a central mass separating a Terfenol-D…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoresponsive coordination of stilbazoles to metalloporphyrinsYuki Iseki, Eishun Watanabe, Atsunori Mori, and Shohei InoueCite this: J. Am. Chem. Soc. 1993, 115, 16, 7313–7317Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published ini…
Abstract In concentrated alkaline sodium silicate solutions a consistent decrease in the amount of silicate monomer Q 0 , end‐groups Q 1 , cyclic trimer Q groups and middle groups Q 2 , and also branching groups in ring formations Q , is observed with increasing molar ratio of SiO 2 to Na 2 O ( R M), whereas for branc…
A review is given on the determination of the thermodynamic properties of Si(OC2H5)4 (TEOS, tetraethoxysilane). In addition, the thermal decomposition of TEOS has been studied by in-situ IR spectroscopy. The decomposition products in the gas phase in the absence of oxygen are organic fragments (ethanol, ethanal, ethen…
Porphyrins are the molecules which are at the heart of most biochemical reactions involved in bioremediation. This review paper discusses the chemical structures, the biosynthetic pathways and the occurrence of porphyrins in the environment. The parallel between the mammalian and bacterial cytochrome P-450 enzyme syst…
Abstract The “Formation Rouge” from the Jbel Rhassoul in Morocco is composed of detrital sediments which have a lacustrine origin. The clays contained in the less than 2 µm fraction of the sediments are detrital phengites and illites, illite/smectites or smectites, and palygorskite. Due to the presence of well preserv…
We have investigated the different contributions to the entropy change at the martensitic transition of different families of Cu-based shape-memory alloys. The total entropy change has been obtained through calorimetric measurements. By measuring the evolution of the magnetic susceptibility with temperature, the entro…
Abstract On the basis of a large amount of research on the fracture behaviour of ceramics, a new failure criterion is advanced. It is pointed out that the rupture of structural ceramics is governed by the mean stress in a specific zone, rather than by the peak stress value. The size of the process zone was derived as…
Ballistic effects are reviewed which allow the determination of scattering rates of local groups of electrons on the Fermi surface of metals. Significant progress in our understanding of scattering mechanisms has been made in the last decade through the improved capabilities of high frequency size effects. The anisotr…
We present the polarization-included electron-gas (PEG) model for crystal structures, which is similar to the modified-electron-gas (MEG) model for crystal structures, but in which the anions can distort from spherical symmetry. This nonspherical distortion is important when the anions occupy low-symmetry positions. F…
Abstract The polyaddition reactions of alicyclic diamines such as 1,4‐diaminocyclohexane (1,4‐CHDA) or 4,4′‐diaminodicyclohexylmethane (DCHM) and configurational isomers of 1,4‐CHDA or DCHM with tetracarboxylic aromatic anhydrides in aprotic solvents were carried out to prepare high molecular weight poly(amic acid)s.…
The structure of glasses, melts, and supercooled melts in the system BaO-SiO 2 with BaO/SiO 2 =0.367 has been investigated in situ with Raman spectroscopy from 25 to 1669°C. For this purpose a technique has been developed that integrates confocal micro-Raman spectroscopy with a microheating stage that fits on the samp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface attachment of well-defined redox-active polymers and block polymers via terminal functional groupsD. Albagli, G. C. Bazan, R. R. Schrock, and M. S. WrightonCite this: J. Am. Chem. Soc. 1993, 115, 16, 7328–7334Publication Date (Print):August 1, 1993Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors influencing the formation of thermally reversible gels comprised of cholesteryl 4-(2-anthryloxy)butanoate in hexadecane, 1-octanol, or their mixturesInna Furman and Richard G. WeissCite this: Langmuir 1993, 9, 8, 2084–2088Publication Date (Print):August 1, 1993Public…