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。
We evaluate homology-derived 3D models of dihydrofolate reductase (DFR1), phosphotransferase enzyme IIA domain (PTE2A3), and mouse/human UBC9 protein (UBC9(24)) which were submitted to the second Meeting on the Critical Assessment of Techniques for Protein Structure Prediction (CASP). The DFR1 and PTE2A3 models, based…
Treatment of gibbsite {γ-Al(OH) 3 } with the lithium salts LiX {X = Cl, Br, NO 3 } in water leads to intercalation of both the cations and anions into the host structure to give [LiAl 2 (OH) 6 ]X·H 2 O {X = Cl, Br, NO 3 }. Thermogravimetric analysis indicates that these materials can be readily dehydrated to give high…
<p style="text-align:justify;"> The three scanning electron microscope diffraction based techniques of electron channelling patterns (ECPs), electron channelling constrast imaging (ECCI), and electron backscatter diffraction (EBSD) are reviewed. The dynamical diffraction theory is used to describe the physics of…
Abstract
The structures of the ferroelectric two-layer Aurivillius phases Bi 2 ANb 2 O 9 (A=Ba, Sr, Ca) have been refined using a combination of X-ray and neutron powder diffraction data. Bi 2 BaNb 2 O 9 is not significantly distorted from idealised symmetry and has been refined in tetragonal space group I4/mmm, a=3.9362(1) an…
The partial oxidation of methane to synthesis gas (syngas, CO + H2) was performed in a mixed-conducting perovskite dense membrane reactor at 850°C, in which oxygen was separated from air and simultaneously fed into the methane stream. Steady-state oxygen permeation rates for La1-xA′xFe0.8 Co0.2O3-δ perovskite membrane…
Abstract Even though mixtures of polyelectrolytes and surfactants are used in a variety of technologies, little is known about the solid state properties of complexes formed by the two components. Recently reported methods for preparing polyelectrolytesurfactant complexes and their solid‐state structure will be descri…
This body of work represents the first volume of a book series covering the field of tissue engineering. Tissue engineering, which refers to a category of therapeutic or diagnostic products and proces
A chiral (salen)Mn III complex [salen: trans-(R,R)-1,2-bis(salicylideneamino)cyclohexane] analogous to Jacobsen’s catalyst is prepared inside the supercages of zeolite Y, showing catalytic activity very similar to that of the chloride complex in the homogeneous phase.
We present a new use of dynamic light scattering that permits the determination of the viscoelastic behavior of a complex fluid. By describing the motion of a scattering particle in a viscoelastic medium in terms of a generalized Langevin equation with a memory function, we relate the time evolution of its mean-square…
A range of increasingly important chemical syntheses for ceramic materials are described. These syntheses are coprecipitation, molten salts, sol–gel processes, hydrothermal techniques, liquid-phase and gas-phase reactions, polymer pyrolysis, the Pechini and citrate gel methods, aerosols and emulsions. Common themes re…
Over the past decade, a substantial number of sandwich-type metal complexes with mixed phthalocyaninato and/or porphyrinato ligands have been synthesised. Owing to the intriguing π–π interactions associated with these complexes, this family of sandwich compounds displays unique physical, spectroscopic and electrochemi…
High‐quality, hexagonal phase, mesoporous silica fibers (see Figure) can be grown by the general procedure for one‐step, two‐phase, room temperature synthesis reported here. The silica fibers, which are 1–5 μm in diameter and up to 5 cm long, have excellent long‐range order, a narrow pore size distribution, and a pore…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationSelf-Assembly and Disassembly of Regioregular, Water Soluble Polythiophenes: Chemoselective Ionchromatic Sensing in WaterRichard D. McCullough, Paul C. Ewbank, and Robert S. LoeweView Author Information Department of Chemistry, Carnegie Mellon University Pittsburgh, Pennsy…
The subject of this review is the synthesis and electropolymerisation of pyrroles or thiophenes with pendant functional groups (metal complexes, ligands, biomolecules for protein binding etc.) to afford electrodes coated with a polymeric matrix containing the desired functionality. Such electrodes are being examined i…
This article deals with the calculation of the shielding tensor of nuclear magnetic resonance (NMR) spectroscopy based on a scalar relativistic two-component Pauli-type Hamiltonian. A complete formulation of the method within the framework of the gauge including atomic orbitals (GIAO) is given. Further, an implementat…
ABSTRACT Concentrations of sodium hydroxide, sulfuric and citric acids used in processing gelatin from cod skins affected both yield and quality. The highest yield of gelatin was obtained when low concentrations [0.1–0.2% (w/v)] of sulfuric acid and sodium hydroxide were applied to the skins followed by treatment with…
A non‐destructive method for purifying carbon nanotubes produced by are discharge is described. The nanotubes, in the form of a kinetically stable colloidal dispersion in a water–surfactant solution, are separated from the nanoparticles by filtration. The Figure shows that purified nanotubes after two filtration steps…
Atomistic simulation has been used to calculate the surface structures and stability of the rutile and anatase polymorphs of TiO 2 . The surface and attachment energies were used to evaluate the equilibrium and pseudo-kinetic morphologies. The surfaces expressed in rutile were {011}, {110}, {100} and {221} with surfac…
Low hydrothermal stability in hot water and aqueous solutions was a critical problem for many applications of the mesoporous molecular sieve MCM-41, compared with conventional zeolites such as Y and ZSM-5. The hydrothermal stability of MCM-41 has been found to improve remarkably by using various salts such as sodium c…