Materials Literature
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Similar to silica tridymite, AlPO4 tridymite shows a sequence of displacive phase transitions resulting in a dynamically disordered hexagonal high-temperature modification. Rietveld refinement reveals that the thermal motions of the tetrahedra can be described either by strongly anisotropic displacement parameters for…
H5XT (bis[[bis(carboxymethyl)amino]methyl]phosphinic acid) is an EDTA(4-)-like ligand containing an extra phosphinate group. [Co(II)(XT)]3-, [Co(III)(XT)]2-, and a series of [Ln(XT)]2- complexes have been prepared. The phosphinate group is not coordinated in the Co complexes but is bound in the lanthanide complexes. S…
Abstract Thermal degradation of poly(arylene sulfone)s had been studied by the combination of thermogravimetric analysis/mass spectrometry (TG/MS) with pyrolysis/gas chromatography/mass spectrometry (Py‐GC/MS) techniques. Through these two methods, the pyrolysates from poly(ether sulfone) (PES) and polysulfone (PSF) w…
The origin of the anomalous line shape of the ${A}_{1}(1\mathrm{T}\mathrm{O})$ soft mode in ${\mathrm{PbTiO}}_{3}$-based single crystals was investigated by polarized Raman-scattering method over a wide range of temperature between 100 and 700 K. Detailed scattering data indicated that the previously proposed anharmon…
Abstract Polyimide/poly(silsesquioxane)‐like (PI/PSSQ‐like) films have three‐dimensional structure with linear PI blocks and a crosslinked PSSQ‐like structure. They have higher thermal stability and char yields than pure PI from 4,4′‐diaminodiphenyl ether and 3, 3′‐oxydiphthalic anhydride (ODPA). In a series of X ‐PIS…
We report Mn K-edge x-ray absorption near edge structure (XANES) calculations of the ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ manganites considering three pair correlations, according to the three fundamental degrees of freedom governing their unusual electronic properties, namely, the ele…
The S41A mutant of riboflavin synthase from Escherichia coli catalyzes the formation of riboflavin from 6,7-dimethyl-8-ribityllumazine at a very low rate. Quenching of presteady-state reaction mixtures with trifluoroacetic acid afforded a compound with an absorption maximum at 412 nm (pH 1.0) that can be converted to…
Hydrophobically substituted dextran (dextran phenoxy, DexP) and dextran phenoxy−poly(ethylene oxide) copolymers (DexP−PEO) have been used to modify the surface of polystyrene latex particles. To avoid polymer desorption in the presence of hydrophobic species such as proteins, the adsorbed layer was stabilized by chemi…
Large magnetic entropy change with comparable magnitude to that of pure Gd has been observed in compounds $\mathrm{La}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{)}_{11.83}{\mathrm{Al}}_{1.17}$ $(x=0.06,0.08)$ at their Curie temperatures of $\ensuremath{\sim}273 \mathrm{K}$ and $\ensuremath{\sim}303 \mathrm{K},…
Abstract The reactive compatibilization of blends of HDPE–PET [high‐density polyethylene–poly(ethylene terephthalate)] was investigated in this study. The compatibilizers used were two grafted copolymers prepared by reactive extrusion containing 1.20–2.30 wt % GMA such as HDPE‐ g ‐GMA and one statistical copolymer con…
Abstract Attempts were made to follow and correlate morphological development with the crosslinking density, or state of cure (SOC), and the surface tension (γ) of the rubber phase in dynamically cured thermoplastic elastomers (TPEs) based on ethylene propylene diene rubber and polypropylene (PP) with 60/40 (w/w) rati…
P. W. Bridgman’s early work on flow and fracture in the presence of hydrostatic pressure showed no systematic effect on strain hardening. This experimental observation led to the conclusions that yielding does not depend on hydrostatic stress and that the yielded material is incompressible. Classical plasticity theory…
Using deuterium NMR spectroscopy in a Couette cell, we observe shear-induced nematic ordering in the concentrated wormlike-micelle system CTAB/D(2)O, and our results are qualitatively consistent with birefringence studies, and in exact quantitative agreement with the degree of order measured in neutron-diffraction mea…
We study the effects of the magnetic field on the relaxation of the magnetization of small monodomain non-interacting particles with random orientations and distribution of anisotropy constants. Starting from a master equation, we build up an expression for the time dependence of the magnetization which takes into acc…
We study the long wavelength electromagnetic resonances of interacting cylinder arrays. By using a normal modes expansion where the effects of geometry and material are separated, it is shown that two parallel cylinders with different radii have electromagnetic modes distributed symmetrically about depolarization fact…
Using classical molecular dynamics simulations we examine the formation of craters during 0.4 - 100 keV Xe bombardment of Au. Our simulation results, and comparison with experiments and simulations of other groups, are used to examine to what extent analytical models can be used to predict the size and properties of c…
A sticky spheres model to describe slow dynamics of a nonequilibrium system is proposed. The dynamical slowing down is due to the presence of entropy barriers. An exact steady state analysis of the representative mean field equations, in the case when the clusters are chosen with the same a priori probability, demonst…
Beginning with a Heisenberg spin Hamiltonian for the manganese ions in the ${\mathrm{Mn}}_{12}\mathrm{Ac}$ molecule, we find a number of model exact low-energy states of the system whose spectrum corresponds to the ordering of the states proposed from experiments. We also obtain the spatial symmetry classification of…
The structure and magnetic properties of boron-oxide-encapsulated magnetic nanocapsules fabricated by arc discharge in diborane $({\mathrm{B}}_{2}{\mathrm{H}}_{6})$ atmosphere have been investigated. The structure of boron-oxide-coated Fe(B) nanocapsules is different from that of carbon-coated nanocapsules. In contras…
From the magnetic Compton-profile (MCP) measurement, we have directly differentiated for the first time the populations in two ${e}_{g}$-type orbitals ( ${x}^{2}{\ensuremath{-}y}^{2}$ and ${3z}^{2}{\ensuremath{-}r}^{2}$) in a manganite. The experimental MCP's along the $[001]$ direction for ${\mathrm{La}}_{2\ensuremat…