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。
Data have been compiled on the cross sections for the collisions of electrons and photons with atomic oxygen (O). The processes considered are total scattering, elastic scattering, momentum transfer, excitations of electronic states (including fine structure levels of the ground state), ionization, and electron attach…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron microscopy study of delamination in dispersions of the perovskite-related layered phases K[Ca2Nan-3NbnO3n-1]: evidence for single-layer formationM. M. J. Treacy, S. B. Rice, Allan J. Jacobson, and J. T. LewandowskiCite this: Chem. Mater. 1990, 2, 3, 279–286Publicati…
A low resistivity and high transmittance Sn doped In2O3 (ITO) film was formed on a glass substrate by dc magnetron sputtering and lower sputtering voltage gave a lower resistivity film. At a sputtering voltage of −250 V, the resistivity obtained was 5.0×10−4Ω cm for room temperature substrate, 2.0×10−4Ω cm for 160 °C…
Genetic and protein engineering are components of a new polymer chemistry that provide the tools for producing macromolecular polyamide copolymers of diversity and precision far beyond the current capabilities of synthetic polymer chemistry. The genetic machinery allows molecular control of chemical and physical chain…
Sintering experiments at constant heating rates were employed to estimate the activation energy for sintering in alumina and in alumina containing 5 vol% zirconia or 5 vol% titania. Grain growth, which can complicate the analysis of sintering kinetics data, was suppressed by using uniformly and densely packed grain co…
The micromechanics involved in increased crack growth resistance, K R , due to the addition of TiB 2 particulate in a SiC matrix was analyzed both experimentally and theoretically. The fractography evidence, in which, the advancing crack was attracted to adjacent particulates, was attributed to the tensile region surr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater soluble hyperbranched polyphenylene: "a unimolecular micelle?"Young H. Kim and Owen W. WebsterCite this: J. Am. Chem. Soc. 1990, 112, 11, 4592–4593Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pubs…
The self‐assembly of intelligent supermolecular materials , for example, liquid crystalline polymers, is the subject of this communication. Employing units based on tartaric acid in the molecular recognition process (see figure) allows the effects of chirality to be investigated as the recognition which occurs at a mo…
An ultrasmall superparamagnetic iron oxide (USPIO) preparation was developed that is small enough to migrate across the capillary wall, a prerequisite in the design of targetable particulate pharmaceuticals. Seventy percent of particles were smaller than 10 nm; 26%, smaller than 5 nm. The blood half-life of USPIO in r…
Abstract It is demonstrated that semiempirical methods give electrostatic potential (ESP) derived atomic point charges that are in reasonable agreement with ab initio ESP charges. Furthermore, we find that MNDO ESP charges are superior to AM1 ESP charges in correlating with ESP charges derived from the 6‐31G* basis se…
The isotopic substitution method in neutron diffraction is applied to two chalcogenide glasses on the (${\mathrm{Ag}}_{2}$S${)}_{\mathit{x}}$(${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$${)}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ (0\ensuremath{\le}x\ensuremath{\le}1) tie line of the Ag-As-S system. It is shown that there is a…
Conducting gels of ultrahigh molecular weight polyethylene and the soluble conjugated polymer poly(3-octylthiophene), P3OT, were prepared by thermoreversible gelation from semidilute solutions in decalin, and subsequent doping with iodine. We report the results of frequency-dependent complex conductivity measurements…
X-ray reflectivity is used to study the temperature-dependent smectic layering of the cyanobiphenyl compounds (nCB) in the isotropic phase at alkylsilane-coated silicon surfaces. Layer-by-layer growth is observed for 11CB and 12CB. Comparison of the layering transition temperatures with measurements at the vapor inter…
A continuum percolation model for heterogeneous mixtures of an ionic conducting solid salt with an insulating second phase is introduced. In this model, the insulating phase is represented by spherical random voids (the Swiss Cheese model) which are allowed to overlap and are randomly distributed in a conducting matri…
The unoccupied-states potential correction (USPC) in the local spin-density-functional (LSDF) formalism is proposed as a way to take correlation effects into account approximately. The method is based on using different potentials for the electrons in valence and conduction bands. When applied to antiferromagnetic tra…
A simple reflection technique for measuring the electro-optic coefficient of nonlinear optical polymeric films is described. The technique is based on the polarization rotation of a laser beam due to the electro-optic effect. It requires no waveguiding and can be used to measure polymeric films during, as well as afte…
Analyses of particle size distributions indicate that clay minerals and other diagenetic and metamorphic minerals commonly undergo recrystallization by Ostwald ripening. The shapes of their particle size distributions can yield the rate law for this process. One consequence of Ostwald ripening is that a record of the…
Abstract It has long been believed that the effectiveness of chemical inhibition of flow induced corrosion was limited by the prevailing flow rate or wall shear stress. The limitation is usually expressed in terms of a critical velocity calculated on the basis of API-RP-14E. At high flow rates and severe turbulence, a…
Pure hexagonal beta -Al 9 SiMn 3 does not order magnetically down to at least T=4.2 K. Recently the authors have studied beta -Al 9 Si(Mn 1-x Fe x ) 3 using Mossbauer effect spectroscopy with x=0.28 (1987 Phil. Mag. Lett. 56 143-51) and discovered a new transition at about 80 K. Here they present neutron diffraction s…
High resolution electrical resistivity measurements ( rho d rho /dT) are used to investigate in detail the two spin-reorientation transitions of the hexagonal ferromagnetic NdCo 5 compound which occur at T SR1 =242 K and T SR2 =283 K (T>T SR2 gives spontaneous magnetisation, M s , parallel to the c axis; T SR1 <T<T SR…