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。
Nanocrystalline particulate films , dispersions of nanoparticles in monolayers in which the inter‐particle distances can be controlled, and systems containing nanoparticles incorporated between the head groups of organic thin films (see Fig.) produced using a wet colloid‐chemical approach are reviewed. Size‐quantized…
A recurrent problem in materials science is the prediction of the percolation threshold of suspensions and composites containing complex-shaped constituents. We consider an idealized material built up from freely overlapping objects randomly placed in a matrix, and numerically compute the geometrical percolation thres…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrobial Synthesis and Characterization of Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)Yoshiharu Doi, Shiro Kitamura, and Hideki AbeCite this: Macromolecules 1995, 28, 14, 4822–4828Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBridged Polysilsesquioxanes. Highly Porous Hybrid Organic-Inorganic MaterialsDouglas A. Loy and Kenneth J. SheaCite this: Chem. Rev. 1995, 95, 5, 1431–1442Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilsesquioxanesRonald H. Baney, Maki Itoh, Akihito Sakakibara, and Toshio SuzukiCite this: Chem. Rev. 1995, 95, 5, 1409–1430Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://doi.org/10.1021/cr00037a012Requ…
First principles calculations of the electronic structure of trigonal iron were performed using density function theory. The results are used to predict lattice spacings, magnetic moments and elastic properties; these are in good agreement with experiment for both the bcc and fcc structures. We find however, that in e…
Polyisocyanates, long studied as theoretical models for wormlike chains in dilute solution and liquid crystals, differ from their biological helical analogs in the absence of a pre-determined helical sense. These polymers have an unusual sensitivity to chiral effects that arises from a structure in which alternating r…
Liquid crystals are promising materials for optical switching and image storage because of their high resolution and sensitivity. Azobenzene liquid crystals (LCs) have been developed, in which azobenzene moieties play roles as both mesogens and photosensitive chromophores. Azobenzene LC films showed a nematic phase in…
Spin-polarization is known to lead to important {\it magnetic} and {\it optical} effects in open-shell atoms and elemental solids, but has rarely been implicated in controlling {\it structural} selectivity in compounds and alloys. Here we show that spin-polarized electronic structure calculations are crucial for predi…
Ab initio molecular dynamics simulation is used to investigate the structure and dynamics of liquid Se at temperatures of 870 and 1370~K. The calculated static structure factor is in excellent agreement with experimental data. The calculated radial distribution function gives a mean coordination number close to 2, but…
Abstract The role of molecular weight distribution on the spinnability, structure, and properties of melt‐spun isotactic polypropylene filaments was studied with the aim of clearly distinguishing the effect of the breadth of the distribution from the effect of the average molecular weight and resin melt flow rate (MFR…
The composition, growth mechanism, and phases of carbon nitride thin films obtained from the reaction of laser ablated carbon and atomic nitrogen have been investigated. The nitrogen composition was found to increase to a limiting value of 50% as the fluence was decreased for laser ablation at both 532 nm and 248 nm.…
The defects and the morphology of stain etched porous Si of 60% to 70% porosity have been studied by electron paramagnetic resonance (EPR), scanning tunneling microscopy (STM), and Raman spectroscopy. The samples contain two pore phases with dimensions in the 1 and 10 nm range and present both visible and infrared pho…
Uridine phosphorylase from E. coli (Upase) has been crystallized using vapor diffusion technique in a new monoclinic crystal form. The structure was determined by the molecular replacement method at 2.5 A resolution. The coordinates of the trigonal crystal form were used as a starting model and the refinement by the p…
We report the first three dimensional x-ray study of the recently discovered twist grain boundary smectic- $C$ phase $({\mathrm{TGB}}_{C})$. Unlike the predictions of the original Renn-Lubensky model for TGB phases (and the experimental observations in the untilted ${\mathrm{TGB}}_{A}$ phase), the smectic layers in th…
We solve the approximate renormalization group found by Niu and Nori for a quasiperiodic tight-binding Hamiltonian on the Fibonacci chain. This enables us to characterize analytically the spectral properties of this model.
The effects of liquid methanol on the photoluminescence intensity and FTIR spectra of red and blue emitting porous silicon were investigated. Hydrogen passivated red emitting samples exhibit quenching and recovery of photoluminescence intensity and broadening of the Si-Hx stretch bands upon exposure to liquid methanol…
Films of composition 0.27 PbO, 0.24 ZrO2, 0.27 TiO2, 0.22 NiO, and containing micrometer sized lead zirconate titanate (PZT) crystallites and nanometer sized nickel particles have been synthesized by a sol-gel technique. Metal particles have diameters in the range 2.0–7.6 nm. The films exhibit values of dielectric con…
The crystal structure of MgTe has been studied in a diamond anvil cell using energy dispersive x-ray diffraction to 60 GPa at room temperature. The first pressure-induced structural phase transformation among magnesium chalcogenides was observed for MgTe at $P\ensuremath{\approx}1\ensuremath{-}3.5$ GPa. The new phase…
Proteins in a biological membrane can be idealized as disks suspended in a thin viscous sheet surrounded by a fluid of lower viscosity (Saffman 1976). To determine the effect of hydrodynamic interactions on protein diffusivities in non-dilute suspensions, we numerically solve the Stokes equations of motion for a syste…