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 order−disorder and order−order transitions (ODT and OOT) of a series of mixtures of a compositionally asymmetric polystyrene- block -polyisoprene- block -polystyrene copolymer (SIS) ( f PS = 0.131) and low molecular weight PS homopolymers with different molecular weights have been investigated by using transmissio…
The sulphuric acid used for the preparation of the Fricke dosimeter solution may contain trace impurities that can affect the yield of ferric ions. Two methods, pre-irradiation or oxidation with hydrogen peroxide, have been proposed to reduce the influence of these impurities. Fricke users sometimes omit this treatmen…
The catalytically active form of monofunctional yeast orotidine-5'-phosphate decarboxylase was a dimer (E(2)). The dimer equilibrium dissociation constant was 0.25 microM in 0.01 M MOPS Na(+) at pH 7.2. The bimolecular rate constant for dimer formation was 1.56 microM(-1) s(-1). The dimeric form of the enzyme was stab…
Recent progress in the synthesis of bulk quantities of long WS 2 nanotubes has allowed them to be considered as potential candidates in various applications, specifically in nanotechnology. In order to evaluate their efficacy in such applications and to obtain a better insight into their growth mechanism, morphologica…
A series of new diazamesocyclic ligands based on a diazamesocycle, 1,5-diazacyclooctane (DACO), functionalized by additional donor groups--1,5-bis(N-1-methylimidazol-2-ylmethyl)-1,5- diazacyclooctane (L1), 1-(2-hydroxybenzyl)-1,5-diazacyclooctane (HL2), 1,5-bis(2-hydroxybenzyl)-1,5-diazacyclooctane (H2L3), and 1-(N-1-…
An AB 2 type monomer, an isomeric mixture of 3,5-bis(4-aminophenoxy)diphenyl ether-3‘,4‘-dicarboxylic acid monomethyl ester ( 6 ), was synthesized starting from 3,5-dimethoxyphenol. A hyperbranched polyamic acid methyl ester precursor was prepared from self-polycondensation of the AB 2 type monomer in the presence of…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionNucleation and Growth of Lead Sulfide Nano- and Microcrystallites in Supramolecular Polymer Assemblies.Ashim K. Dutta, Thaotrang Ho, Liqin Zhang, and Pieter StroeveCite this: Chem. Mater. 2000, 12, 10, 3236Publication Date (…
X-ray diffraction studies on poly(ferrocenylenedimethylsilylene), PFDMS, indicate a 3D crystalline phase with monoclinic packing of the macromolecules with possible unit cell parameters a = 13.29 Å, b = 6.01 Å, c = 13.9 Å, and γ = 93.6° . There are two main chains with four monomer units per unit cell, X-ray crystal d…
A series of poly(3,4-alkylenedioxypyrrole)s are reported as a new class of electronically conducting polymers exhibiting especially low oxidation potentials from ca. −0.6 to −0.4 V vs Fc/Fc + (equivalent to −0.15 to +0.05 V vs SCE) as desired for ambient stability of the doped and conducting states. These polymers exh…
Modulated differential scanning calorimetry was used to probe the thermal behavior of poly(methyl methacrylate) (PMMA) adsorbed onto silica from solution and subsequently dried. Changes in the glass transition were studied as a function of the adsorbed amount and solvent system used to deposit the polymer. The glass t…
An efficient method for calculating the electronic structure of systems that need a very fine sampling of the Brillouin zone is presented. The method is based on the variational optimization of a "single" (i.e. common to all points in the Brillouin zone) basis set for the expansion of the electronic orbitals. Consider…
The semi-classical Lifshitz-Kosevich (LK) description of quantum oscillations is extended to a multiband two-dimensional Fermi liquid with a constant number of electrons. The amplitudes of novel oscillations with combination frequencies, recently predicted and observed experimentally, are analytically derived and comp…
An approach is proposed to determine parameters of homogeneous and inhomogeneous broadening for reflection lines of quasi-two-dimensional excitons in semiconductor quantum well structures. A phenomenological model is developed taking into account fluctuations of the exciton energy which are expected to cause inhomogen…
Constitutive equations are derived for the viscoelastoplastic response of amorphous glassy polymers at isothermal loading with small strains. A polymer is treated as an ensemble of cooperatively relaxing regions (CRR) which rearrange at random times as they are thermally agitated. Rearrangement of CRRs reflects the vi…
Nanometer-sized metal particles (e.g., gold and silver) are certain to be important fundamental building blocks of future nanoscale electronic and optical devices. However, there are numerous challenges and questions which must be addressed before nanoparticle technologies can be implemented successfully. For example,…
The complete crystallography of a one-dimensional crystal of potassium iodide encapsulated within a 1.6-nanometer-diameter single-walled carbon nanotube has been determined with high-resolution transmission electron microscopy. Individual atoms of potassium and iodine within the crystal were identified from a phase im…
1. The scope of process development 2. Strategy for process development 3. Pre-reaction equilibria 4. Competing reactions in homogeneous media 5. Mixing effects in pseudo-homgeneous systems 6. Equilibria in multiphase systems 7. Dispersion and mass transfer in multiphase systems 8. Mass-transfer and reaction in two-ph…
Bis-thiazolium salts, precursors of dithiadiazafulvalene (DTDAF), have been prepared. Electrochemical investigations have been carried out on these salts in order to determine the redox behavior of DTDAF. These bis-thiazolium salts undergo intramolecular coupling, either chemically or electrochemically, to afford N,N'…
For nonadiabatic electron-transfer reactions, it is common to make a Condon approximation assumption that the mixing matrix element is independent of nuclear geometry. We test the validity of the Condon approximation using Mulliken-Hush analysis applied to the biphenyl alcohol molecule at various geometries. Calculati…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSupramolecular Catalysis of Olefin [2 + 2] PhotodimerizationDario M. Bassani, Vincent Darcos, Sarah Mahony, and Jean-Pierre DesvergneView Author Information Laboratoire de Chimie Organique et Organométallique CNRS UMR 5802 Université Bordeaux 1 33405 Talence Cedex, Fra…