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。
A simple and general method for making ceramic laminates with porous crack‐deflecting interlayers is demonstrated. Both the strong laminae and the porous interlayers are made by tape casting suitable slurries using the same ceramic powders. Porosity is introduced into the interlayer by adding starch particles to the s…
We have investigated the interaction of Co 2+ ions (as nitrate salt) with dendrimers of the poly(propylene amine) family functionalized in the periphery with fluorescent dansyl units. Each dendrimer n D, where the generation number n goes from 1 to 5, comprises 2 ( n +1) dansyl functions in the periphery and 2 ( n +1)…
Scientific investigations have long concluded that prolonged exposure to low dose radiation can induce deleterious effects in humans. The aim of this paper is to investigate the radioactivity of gypsum and gypsum derived products as part of a bigger project aimed at establishing radiation levels in materials or/and pr…
Rhizopus oryzae, strain IMI 057412, was immobilised by inclusion in six different polymers: polyvinlformal, polysulfone, polyurethane, alginate, polyacrylamide, k-carrageenan, polyethyleneimine(PEI). It was also grown on a seventh, polyurethane. The biomass/polymer matrices were formed into equal size units (4 mm sphe…
<span class="label">1</span> <div class="htmlview paragraph">Natural and synthetic sulfides are important components in friction materials such as pads, linings and even clutch facings and are summarized under the term “Friction Stabilizers”. Their unique properties lead to a high and stable friction…
The slurry‐based Three Dimensional Printing (3DP TM ) process requires the production of an easily redispersible powder bed from a well‐dispersed slurry. Understanding and control of the interparticle potential in the dispersed state, as well as in the dry consolidated state, are important. The strength of the particl…
A new experimental model based on the geometric parameters of a woven structure's yarn linear density and fabric tightness has been developed to predict the volume porosity of woven fabrics. The experimental model is based on a factor analysis. Experiments involve fabrics made from staple yams, but the mathematical mo…
Butyric esters of (2-hydroxypropyl) cellulose (BuPC) with different degree of substitution (DS) were synthesized via control of the esterification time of butyryl chloride and (2-hydroxypropyl) cellulose. These BuPCs are thermotropic and displayed different colors at ambient temperature due to the formation of a chole…
The high accuracy of X-ray analyses at atomic resolution is now able to display subtle deformations from standard geometry of building blocks in proteins. From the analysis of nine ultra-high resolution protein structures, we derived the first experimental evidence that a significant pyramidalization at the main-chain…
Abstract Thymidine and uridine, as well as calf thymus DNA (ctDNA), have been shown for the first time to function as chiral photosensitizers in aqueous solution, to effect the enantiodifferentiating photoisomerization of (Z)-cyclooctene, giving the chiral (E)-isomer in enantiomeric excesses of up to 15%.
Neutron powder diffraction experiments at high temperature (300-1600 K) were performed at BENSC (Berlin, D), on synthetic Zn 0.97 Fe 2.02 O 4 , to investigate the cation partitioning of Zn and Fe over the tetrahedral and octahedral sites as a function of T. The data analysis combined Rietveld structure refinements wit…
Abstract A single-phase LaMnO3+δ perovskite with high surface area could be synthesized after air-calcining the hydroxide precursor at 650 °C and above. The precursor was easily obtained by dropping a mixed aqueous solution of La and Mn nitrates into highly basic aq. NH3 with and without the presence of N(CH3)4Br. The…
Abstract A low molecular weight gelator containing β-diketonato ligands was prepared from a derivative based on trans-(1R,2R)-diaminocyclohexane. Gels were converted to mechanically-robust and thermally-stable gels by complexation between β-diketonato ligands and divalent metal ions.
Two commercial chemical blowing agents, azodicarbonamide (ADC) and oxybisenzenesulphonylhydrazide (OBSH), were used alone and in blends for expanded natural rubber vulcanisates. The expanded rubber vulcanisates were characterised with respect to the apparent foam density, degree of crosslinking, tensile properties and…
Molecular Scaffolds formed by the linking of bicyclo[2.2.1]heptane (norbornane) subunits by sharing a common C2-bridge have great appeal to the molecular architect since modelling studies have shown that the syn-facially fused members have a curved topology. Furthermore, this curvature can be modified by replacement o…
Abstract. We examined the effects of the transparent fibroin film (silk film) on full‐thickness skin wounds. Full‐thickness dermatotomies (15 mm × 9 mm) were prepared on the dorsal wall of CRJ:CD‐1 nu/nu (ICR nu/nu ) mice. The area of the wounds dressed with silk film was reduced to 10% of that made by the dermatotomy…
Abstract The bleaching of cottonseed oil by alumina-pillared (Al-pillared) acid-activated clays was investigated. Acid activation of a Ca-rich montmorillonite (CMS STx-1) following treatment with 1, 4, and 8 eq/L sulfuric-acid solutions, as well as subsequent pillaring with alumina, produces new materials. These mater…
Two different behaviors controlled by local lattice environment of crystallization are observed in the IR spectra of polycrystalline natural tourmalines from the elbaite-schorl series in the O-H stretching region (3800-3100 cm -1 ). The first case is characterized by the presence of three O-H stretching bands, and is…
In situ poly(hydroxyalkanoate) (PHA) levels and repeating-unit compositions were examined in stratified photosynthetic microbial mats from Great Sippewissett Salt Marsh, Mass., and Ebro Delta, Spain. Unlike what has been observed in pure cultures of phototrophic bacteria, the prevalence of hydroxyvalerate (HV) repeati…
Dynamic processes in crystalline solids are reflected in the atomic displacement amplitudes determined, together with the atomic coordinates, by crystal structure analysis. The interpretation of such amplitudes poses two severe problems: (a) The relative phases of the atomic displacements are lost; and (b) the amplitu…