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。
The charge storage capacity and electrical conductivity of polypyrrole are followed through regimes of chemically reversible and irreversible electroactivity. Overoxidation of polypyrrole occurs at potentials in excess of 0.7 V vs. a saturated calomel electrode (SCE), as demonstrated by cyclic voltammetry of thin film…
Equilibrium and dynamics of block-copolymer chains in a homopolymer layer (between the interface with another homopolymer and the free surface) are considered. An analytical mean-field theory for equilibrium copolymer segregation to the interface is presented, the results being in good agreement with those of another…
We consider the steady-state rheology of aggregating colloidal suspensions, where cluster size is limited by the imposed shear. Brittle versus work-hardening behavior of the clusters is distinguished. For brittle clusters at large shear rates we predict a scaling law for their size and corresponding viscosity incremen…
The AdhE protein of Escherichia coli is a homopolymer of 96-kDa subunits harboring three Fe(2+)-dependent catalytic functions: acetaldehyde-CoA dehydrogenase, alcohol dehydrogenase, and pyruvate formatelyase (PFL) deactivase. By negative staining electron microscopy, we determined a helical assembly of 20-60 subunits…
The collagens are products of a superfamily of closely related genes. Currently, there are 13 described collagens encompassing at least 25 separate genes. The collagen molecules can be categorized into four classes. Class I consists of molecules that form the banded collagen fibers that are readily seen by routine ele…
Abstract The crystal structure of the displacive ferroelectric mineral russellite, Bi 2 WO 6 , has been determined using Rietveld profile refinement of high-resolution, time of flight, neutron powder diffraction data on the synthetic compound. Russellite is orthorhombic, Pca2 1 , with a 5.43726(2) Å, b 16.43018(5) Å,…
An explicit form for the orientating potential acting in uniaxial liquid crystal phases is derived, by analogy with the surface anchoring potential which determines the orientation of macroscopic anisometric particles. The surface of a molecule is determined by describing the molecule as an assembly of van der Waals s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-consistent mean field theory of the microphases of diblock copolymersJ. D. Vavasour and M. D. WhitmoreCite this: Macromolecules 1992, 25, 20, 5477–5486Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1…
The effects of MnO 2 addition on k 31 and Q m were investigated for Pb(Zr 0.5 Ti 0.5 )O 3 (PZT). The MnO 2 addition increased Q m and k 31 in a low poling field. This result indicated that Mn-doped PZT possessed properties of `soft' and `hard' piezoelectrics simultaneously. Electron spin resonance measurement indicate…
A procedure has been developed to predict the stator iron loss of a brushless DC motor with due account of the operating condition of the drive system. Finite-element analysis is used to obtain a series of instantaneous magnetostatic field distributions within a motor, for which the instantaneous currents are derived…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpider silk: the unraveling of a mysteryRandolph V. LewisCite this: Acc. Chem. Res. 1992, 25, 9, 392–398Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.org/doi/10.1021/ar00021a002https…
Abstract Poly(2-iso-propyl-2-oxazoline) (PiPrOZO), prepared by cationic ring-opening polymerization of iPrOZO, has been found to be a thermo-sensitive polymer. PiPrOZO possesses a cloud point (CP) around 36 °C. The CP changed by the addition of sodium chloride or a surfactant. For utilizing these characteristics, a ne…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation of binary polyolefin phase behavior with statistical segment length asymmetryFrank S. Bates, Mark F. Schulz, Jeffrey H. Rosedale, and Kristoffer AlmdalCite this: Macromolecules 1992, 25, 20, 5547–5550Publication Date (Print):September 1, 1992Publication History P…
Diamond phase carbon films have been grown on silicon substrates at temperatures of less than 50 °C by using an organic solution. Substrates were negatively biased with sufficient dc potential to simulate ionized deposition conditions used in physical vapor deposition. The surface morphology, crystal structure, and so…
In this Rapid Communication, a novel simple monatomic liquid, possessing the distinctive icosahedral inherent local order, is reported. It has been generated by a special form of pair potential employed in a molecular dynamics system of 16 384 particles, and remained stable within a wide range of temperatures explored…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAzo polymers for reversible optical storage. 2. Poly[4'-[[2-(acryloyloxy)ethyl]ethylamino]-2-chloro-4-nitroazobenzene]A. Natansohn, S. Xie, and P. RochonCite this: Macromolecules 1992, 25, 20, 5531–5532Publication Date (Print):September 1, 1992Publication History Published o…
We present a general multiple-scattering (MS) scheme utilizing complex potentials for the calculation and interpretation of inner-shell x-ray-absorption fine structure for clusters of atoms in condensed matter with application to the case of the molecules ${\mathrm{SF}}_{6}$, ${\mathrm{GeCl}}_{4}$, and ${\mathrm{Br}}_…
A dynamic generalization of the Preisach hysteresis model is proposed, in which the rate of change of the flux associated with each elementary Preisach loops is not infinite, as in the standard Preisach model, but proportional to the difference between the external field and the loop threshold fields. With this assump…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain-length dependence of electrochemical and electronic properties of neutral and oxidized soluble .alpha.,.alpha.-coupled thiophene oligomersJ. Guay, P. Kasai, A. Diaz, Ruilian Wu, James M. Tour, and Le H. DaoCite this: Chem. Mater. 1992, 4, 5, 1097–1105Publication Date (…
The liquid-glass transition dynamics of the molecular glass Salol has been studied by light-scattering spectroscopy from 383 to 198 K. Analysis of wide-frequency-range composite spectra revealed the relaxation dynamics from 0.2 GHz to 3.5 THz. A two-step relaxation process was observed near the crossover temperature $…