Materials Literature
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Heat-capacity C(T) data on the title materials, as well as on CuO for comparison, were obtained with use of a differential scanning calorimeter to a precision of \ensuremath{\simeq}0.1--1%. The measurements were carried out (i) to characterize the thermal anomaly at the tetragonal-orthorhombic transition temperature $…
There have been a great deal of progress in the development of high performance silicon nitride and sialon ceramics, largely owing to better understandings of sintering phenomena and processing-microstructure-properties relations. In this paper, sintering mechanisms and factors affecting sintering are reviewed for the…
A direct approach to the investigation of the reflection of electromagnetic waves from a plane interface separating a vacuum half-space and a stratified anisotropic layer is presented. The formulation involves the generation of a Riccati differential equation for a certain 2*2 reflection matrix. The approach is alread…
Poly(amidoamine)s were synthesized by polyaddition reaction: to bis-acryloylpiperazine of piperazine (1), or N,N'-bis(2-hydroxyethyl)ethylenediamine (2), and to 2,2-bis(acrylamido)acetic acid of piperazine (3). Compound 2 was also end-capped with 4-hydroxythiophenol, thus introducing a terminal moiety suitable for rad…
Treatment of poly(vinylidene difluoride), PVDF, with aqueous lithium hydroxide solution results in defluorination and oxidation at the polymer surface, whereas all previously reported wet methods for surface modification of fluoropolymers have to be executed under a dry nitrogen atmosphere, this process can be perform…
Two polymorphs of the condensed species [Ti16(µ4-O)4(µ3-O)8(µ-O)4(µ-OEt)16(OEt)16] have been obtained: a monoclinic form prepared in absolute ethanol and a tetragonal one obtained from 5% aqueous ethanol. The monoclinic form (compound 1) crystallizes in the space group C2/c with a= 23.392(7), b= 19.627(8), c= 24.130(1…
The calculated hyperpolarisabilities of substituted polythiophenes, polypyrroles and polyfurans containing an electron donor at one end of the molecule and an electron attractor at the other increase slowly with increasing number of heterocyclic rings. If the effective hyperpolarisability per unit volume is considered…
X-ray photoelectron spectroscopy was used to study the reoxidation kinetics of both mechanically and chemically polished as well as freshly fractured SrTiO3 surfaces. X-ray take-off angles were varied in order to resolve surface contributions from those further into the sample. Most surfaces were found to have Sr/Ti r…
ABSTRACT Afmite-element formulation is used to obtain numerical solutions to the simultaneous moisture and heat diffusion equations describing the moisture removal and heat intake process for an isotropic sphere. The model is used to solve a sample problem of drying a soybean kernel. The distribution and gradients of…
A two-surface kinematic hardening model for the stress-strain response of metals under nonproportional tension-torsion cyclic loading is developed and verified with critical experiments. In this model, both the yield and limit surfaces are assumed to be ellipses in the two-dimensional stress plane to account for aniso…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"Intrinsic" response of polymer liquid crystals in photochemical phase transitionTomiki Ikeda, Takeo Sasaki, and Haeng Boo KimCite this: J. Phys. Chem. 1991, 95, 2, 509–511Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic characterization of meso-tetrakis(1-methylpyridinium-4-yl)porphyrins, [(TMpyP)H2]4+ and [(TMpyP)M]4+, in aqueous micellar media, where M = VO2+, Cu(II), and Zn(II)Karl M. Kadish, B. G. Maiya, and C. Araullo-McAdamsCite this: J. Phys. Chem. 1991, 95, 1, 427–431P…
Pure, single‐phase stoichiometric Pb(Fe 0.5 Nb 0.5 )O 3 (PFN) powders were successfully formed by molten salt synthesis using mixtures of NaCl and KCl salts. Lower temperatures and shorter times (1/2 h at 800°C) were needed for singlephase PFN formation from molten salts relative to those required for solid‐phase meth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the structure of perfluoro ethers: structural models for poly(perfluoroformaldehyde), poly(perfluoroethylene oxide) and poly(perfluoropropylene oxide)J. Pacansky, M. Miller, W. Hatton, B. Liu, and A. ScheinerCite this: J. Am. Chem. Soc. 1991, 113, 1, 329–343Publicat…
Consider a diffraction of a beam of particles in <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="double-struck upper R cubed"> <mml:semantics> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="double-struc…
An experimental apparatus has been developed to permit simultaneous measurement of temperature change and moisture flux through fabrics during the transient period after one set of fabrics has been exposed to humidity and temperature gradients. Both the water vapor method and the sweat method were used to study the tr…
Abstract The ring‐retaining products formed from the OH radical‐initiated reactions of o ‐, m ‐, and p ‐xylene in the presence of NO x have been identified and their formation yields determined. Experiments were carried out at 298 ± 2 K and in the presence of 740 torr total pressure of air. The products observed, and…
Distribution of bacteria influential on the algal growth during the process of development and decay of Gymnodinium nagasakiense red tide and their effects on the growth of G. nagasakiense and Skeletonema costatum were investigated in Uranouchi Inlet, Kochi. Seawater samples collected around red tide period of G. naga…
The authors present a review of surface dielectric behavior of several polymers under high-voltage (HV) outdoor conditions. The scope is limited to materials used to provide weathersheds on non-ceramic insulators and room-temperature vulcanized silicone rubber coating used on ceramic insulators for combating problems…
The small-amplitude periodic optical transmittance response of redox polymer films is derived and related to the corresponding electrical behaviour. The combination of optical and electrical measurements allows Faradaic and non-Faradaic charging processes to be distinguished. The analysis of the modulated transmission…