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。
Poly(hydroxyalkanoates) (PHAs) were isolated from Pseudomonas aeruginosa 44T1 cultivated on euphorbia oil and castor oil. With the aid of 2-D proton NMR spectra and proton-detected multiple bond coherence NMR spectra the structures of the PHAs were determined. In addition to the usual PHA constituents (C6-C14 3-hydrox…
A 490-nm-deep nanostructure with a period of 200 nm was fabricated in a GaAs substrate by use of electron-beam lithography and dry-etching techniques. The form birefringence of this microstructure was studied numerically with rigorous coupled-wave analysis and compared with experimental measurements at a wavelength of…
The biodegradation of samples of poly(3-hydroxybutyrate)(P(3HB)), poly(3-hydroxybutyrate-co-10%-3-hydroxyvalerate)(P(3HB-co-10 %-3HV)), and poly 3-hydroxybutyrate-co-20%-3-hydroxyvalerate)(P(3HB-co-20%- 3HV)) was investigated in situ in natural waters. The degradation was studied by decrease in mass, molecular weight,…
A series of tests is available to study the biodegradation of plastic materials under either laboratory or field conditions. Most of the standard methods have been published by the American Society for Testing and Materials. All of them describe techniques to investigate the biodegradation of plastics under laboratory…
We calculate ab initio the electronic states, spontaneous polarization P, and Born dynamical charge ${\mathit{Z}}^{\mathrm{*}}$ of ZnO, using the local-density approximation (LDA), the Hartree-Fock (HF), and a model GW scheme. Upon going from HF to GW and to LDA, the d bands raise substantially in energy, the model GW…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of the Specific Adsorption of Proteins onto Gold Surfaces with Poly(L-lysine) MonolayersBrian L. Frey, Claire E. Jordan, Steven. Kornguth, and Robert M. CornCite this: Anal. Chem. 1995, 67, 24, 4452–4457Publication Date (Print):December 15, 1995Publication History Pu…
Heavily B-doped polycrystalline diamond films ([B]≳1019 cm−3) are studied by Raman spectroscopy and electron spin resonance. The formation of an impurity band is accompanied by a Fano-type interference for the one-phonon scattering. Bands at 1200 and 500 cm−1 are observed in Raman spectroscopy for concentrations above…
The contrasting melting behavior of different surface orientations in metals can be explained in terms of a repulsive or attractive effective interaction between the solid-liquid and the liquid-vapor interface. We show how a crucial part of this interaction originates from the layering effects near the liquid metal su…
Some mathematical calculations were done that provided information about the structure and biochemistry of polyhydroxyalkanoic acid (PHA) granules and about the amounts of the different constituents that contribute to the PHA granules. The data obtained from these calculations are compared with data from the literatur…
Until now, micrometer-scale or larger crystals of the III-V semiconductors have not been grown at low temperatures for lack of suitable crystallization mechanisms for highly covalent nonmolecular solids. A solution-liquid-solid mechanism for the growth of InP, InAs, and GaAs is described that uses simple, low-temperat…
Transmittance in inhomogeneous composite structures in which the arrangement or shape of an absorbing component is anisotropic, depends on the incident direction in relation to the axes that define the anisotropy. There are easily distinguished preferred transmittance directions in a given plane of incidence. However…
The anodic oxidation of amorphous Al-32 at% Zr alloy films at high current efficiency results in amorphous anodic films, comprising a mixture of Al 2 O 3 and ZrO 2 units, of uniform composition and thickness. The use of an immobile xenon marker reveals that the films develop, under the high field, at the alloy/film an…
This book deals with the effect of crystal symmetry in determining the tensor properties of crystals. Although this is a well-established subject, the author provides a new approach using group theory and, in particular, the method of symmetry coordinates, which has not been used in any previous book. Using this appro…
An important aspect of real ferromagnetic particles is the demagnetizing field resulting from magnetostatic dipole-dipole interaction, which causes large particles to break up into domains. Sufficiently small particles, however, remain single-domain in equilibrium. This makes such small particles of particular interes…
Abstract The dendr itic cycl ophanes (dendrophanes ) 1–3 containing a [6.1.6.1]paracyclophane as the initiator core embedded in dendritic poly(ether‐amide) shells of first ( 1 ), second ( 2 ), and third ( 3 ) generation were prepared and characterized. The X‐ray crystal‐structure analyses of esters 7 and 4 , derivativ…
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…
Abstract The blends of epoxidized natural rubber (50 mol %) (ENR) and poly(ethylene‐ co ‐acrylic acid) (PEA) (6 wt %) are demonstrated to be partially miscible up to 50% by weight of PEA and completely miscible beyond this proportion. The miscibility has been confirmed by a DSC study which exhibits a single second‐ord…
Ab initio local-density-functional-theory calculations of formation energies, surface stress, and multilayer relaxations are reported for the (111), (100), and (110) surfaces of Rh. The study is performed using ultrasoft pseudopotentials and plane waves in a parallel implementation. Calculated values are in good agree…
Diamond thin films, 5 μm in thickness, were grown selectively on patterns of porous silicon by hot-filament chemical vapor deposition (HFCVD). Monocrystalline p-type silicon substrates, with (100) orientation and resistivity 5–15 Ω cm, were patterned by conventional photolithography to provide a photoresist mask for s…
A range of amorphous hydrogenated carbon (a-C:H) samples have been studied using inelastic neutron spectroscopy (INS) and Fourier transform infrared (FTIR) spectroscopy. Using these complementary techniques, the bonding environments of both carbon and hydrogen can be probed in some detail, with the INS data providing…