Materials Literature
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A B1–B2 transition in chalcogenides has been studied using three body potential approach upto 40 GPa. Phase transition pressures, volume collapses are found to be closed to experimental results. High phase transition pressures in CaSe and CaTe can be attributed to large cation anion differences. High-pressure elastic…
D-Aminoacylase is an attractive candidate for commercial production of D-amino acids through its catalysis in the zinc-assistant hydrolysis of N-acyl-D-amino acids. We report here the cloning, expression, and structural-based mutation of the D-aminoacylase from Alcaligenes faecalis DA1. A 1,007-bp PCR product amplifie…
We studied the fingerprint texture of homeotropic cholesteric liquid crystal (CLC) films. Parallel (360°) and antiparallel (180°) alignment treatments were adopted for these films such that the molecules at the boundaries had an approximately 1° pretilt angle to the substrate normal. The experimental results showed th…
Room temperature time-resolved luminescence measurements on single CdSe/ZnS quantum dots (QDs) are presented. Luminescence spectra were recorded over time periods of up to 30 min with a time resolution down to 6 ms. A clear 30–40 nm blue shift in the emission wavelength is observed for QDs in ambient air, before the l…
A neutron diffraction study over a wide Q-range (Qmax = 16 Å−1) has been made in order to analyze the change of the local order of triphenyl phosphite through the isothermal transformation between the supercooled liquid into the glacial state at different temperatures Ta. Direct evidence is given from the analysis of…
Abstract New polyurethanes with lactone groups in the pendants and main chains were synthesized by the polyaddition of two kinds of L ‐gulonolactone‐derived diols (2,3‐ O ‐isopropylidene‐ L ‐gulono‐1,4‐lactone and 5,6‐ O ‐isopropylidene‐ L ‐gulono‐1,4‐lactone) with hexamethylene diisocyanate and methyl ( S )‐2,6‐diiso…
Barium strontium titanate [(Ba,Sr)TiO 3 , BST] is an attractive material with a very high dielectric constant. However, the dielectric constant of BST films decreases with film thickness, which has become a serious problem for dynamic random access memory (DRAM) application. We found Fe doping of BST films to be remar…
ADVERTISEMENT RETURN TO ISSUEPREVNoteArchitectural Disparity Effects in the Morphology of Dendrimer−Linear Coil Diblock CopolymersDarrin J. Pochan, Lisa Pakstis, Elbert Huang, Craig Hawker, Robert Vestberg, and John PopleView Author Information Materials Science and Engineering and Delaware Biotechnology Institute, Un…
A new hydrocarbon/perfluorocarbon phase-switching strategy based on coordination of pyridyl-tagged molecules to a highly fluorinated dicopper-carboxylate complex possessing two accessible axial coordination sites is described. When a chloroform solution of the tetrapyridyl-substituted porphyrin 3 (0.1 mM, 2 mL) is lay…
Fracture resistance in biomineralized structures has been linked to the presence of proteins, some of which possess sequences that are associated with elastic behavior. One such protein superfamily, the Pro,Gly-rich sea urchin intracrystalline spicule matrix proteins, form protein-protein supramolecular assemblies tha…
By the first-principles calculations both for electronic structures and effective exchange constants, we investigate the stability of ferromagnetism of zinc-blende (ZB) type CrAs, and further examine a possibility of ferromagnetism of ZB type Mn M ( M =Si, Ge and Sn). ZB type CrAs, a half-metallic ferromagnet reported…
Rate constants of oxidation of thioanisole, PhSMe, by H 2 O 2 mediated by tetraperoxomolybdate dianion, Mo(O 2 ) 4 2-, are almost unaffected by addition of hexan-1-ol or octan-1-ol to micellized cetylpyridinium chloride, CPyCl, although these hydrophobic alcohols should perturb the micellar interfacial region. The equ…
We have introduced a nonswitching layer model to explain voltage shift phenomena of hysteresis loops in a heteroepitaxial barium titanate thin film capacitor. A nonswitching layer, which has irreversible spontaneous polarization, was assumed to be present between the ferroelectric layer and the bottom electrode layer.…
Abstract Seven possible regioselectively methylated cellulose acetates (RS‐MCAs)—2,3,6‐tri‐ O ‐methyl cellulose acetate, 3,6‐di‐ O ‐methyl cellulose acetate, 2,6‐di‐ O ‐methyl cellulose acetate, 2,3‐di‐ O ‐methyl cellulose acetate, 6‐ O ‐methyl cellulose acetate, 3‐ O ‐methyl cellulose acetate, and 2‐ O ‐methyl cellul…
New organometallic−organic hybrid materials are reported and their properties evaluated. The hybrid was formed by polymerizing methyl methacrylate with 0.3 mol% of a methacrylate-substituted oxotitanium cluster [Ti 6 O 4 (OEt) 8 (OMc) 8 ]. In this hybrid, the cluster core was functionalized by the organic ligands, and…
Monolithic silica columns with defined mesopore and a tunable macropore structure were fabricated by the gel-casting of ordered mesoporous silica precursors.
Abstract The polycondensation of decafluorobenzophenone with hexafluorobisphenol A was modified by the addition of a molecular sieve dehydrating apparatus to the refluxing reaction system. This modification promoted the polymerization and enabled the reactions to be conducted in milder conditions and completed in a sh…
Abstract A novel dianhydride monomer, 3,6‐di[3′,5′‐bis(trifluoromethyl)phenyl]pyromellitic dianhydride (12FPMDA), was synthesized via a three‐step process: (1) the preparation of 3,5‐bis(trifluoromethyl)benzene boronic acid (6FBB) and 3,6‐dibromo‐1,2,4,5‐tetramethylbenzene (2B4MB) via Grignard and bromination reaction…
The X-ray diffuse scattering intensities were measured at room temperature for the Pt rich Pt–15.0 at.% Cr single crystal quenched from 800°C three-dimensionally. The atomic short-range order (ASRO) intensity component from the total diffuse ones was separated with the use of Borie–Sparks method [Acta Cryst. A 27 (197…
Samarium films capped with a thin palladium overlayer undergo a metal to semiconductor transition during in-situ hydrogen loading ( P H2 =1.01 × 10 5 Pa) at room temperature. The transition is accompanied by a change in optical appearance, i.e. metallic gray samarium films change to golden greenish transparent samariu…