Materials Literature
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It is found that the characteristic infrared spectra of thermally grown silicon dioxide in the 1075 cm−1 region for films in the thickness range 28–450 Å mathematically deconvolute consistently into two distinctly separate Gaussian profiles. The derived peaks are found around 1050 cm−1 with a full width at half-maximu…
A neutron-diffraction experiment (\ensuremath{\lambda}=0.704 A\r{}) has been performed for the first time on liquid arsenic above the triple point. The coordination number (Z=3) does not change through the semimetal-to-semiconductor transition on melting. This is in sharp contrast to the elemental semiconductors (Si,G…
The ultrasonic velocity and absorption of 32 silicate melts have been determined as a function of temperature (1175–1925 K) and frequency (3–12 MHz). The samples include the components SiO 2 , TiO 2 , Al 2 O 3 , FeO, MgO, CaO, SrO, BaO, Li 2 O, Na 2 O, K 2 O, Rb 2 O, and Cs 2 O, and range from simple alkali silicates…
A constant thermodynamic tension Monte Carlo method is introduced and applied studies of the elastic properties of a two-dimensional system of hard cyclic hexamers. Elastic compliances and elastic constants are determined at a number of different values of the pressure. The existence of the phase transition between a…
The magnitude and temperature dependence of most of the properties of amorphous solids are anomalous at very low temperatures ( less, similar1 Kelvin). Phonon-assisted tunneling of a distribution of glassy bistable configurations, or two-level systems, can account for these anomalies. A unified understanding of the lo…
Abstract Aromatic (poly)cycloaliphatic polysulfonates of high molecular weight can be easily obtained by interfacial polycondensation of aromatic (poly)cycloaliphatic diphenols with aromatic disulfonyl chlorides. The polysulfonates were found to have a low degree of crystallinity, softening ranges in the region 180–31…
Abstract Pure regenerated cellulose fibers and those containing various amounts of phosphorus nitride were pyrolyzed under different conditions in the temperature range of 150–440°C. Easily volatile liquid pyrolysis products, the tar fraction of limited volatility, and the charred residue were determined gravimetrical…
Abstract On heating in DSC, samples of UHMWPE show a single, fairly sharp, melting endotherm which may be increased to a peak temperature of 147°C and 77% crystallinity by annealing at elevated temperatures. An irreversible conversion of nascent to folded crystals, between 134 and 142°C, was observed by heating nascen…
The temperature of the structural phase transition in GeTe is calculated complete ab initio from a model lattice-dynamical Hamiltonian that is constructed from microscopic quantum-mechanical total-energy calculations. The phase transition in the model system is studied through a renormalization-group-theory approach,…
We report measurements of the state of wetting of two liquid mixtures at coexistence near their respective critical consolute temperatures. Borosilicate glass capillary tubes were reacted with hexamethyldisilazane to produce substrates of uniform and controlled silylation. Surfaces of low coverage exhibit a series of…
The Raman scattering strength of Mg-Cl boracite has been measured as a function of temperature. The Landau theory of second order phase transitions was extended to predict polarization-optic coefficients and the Raman scattering strength of improper ferroelectrics. The boracite models of Dvorak, and Levanyuk and Sanni…
Abstract Hydrogen induced stress corrosion cracking (HSCC) resistance and mode of fracture in various low and high strength steels (yield strength 120 to 960 MPa) and containing different levels of phosphorus content were studied using constant extension rate test method in various acid media viz. sulphuric acid solut…
X-ray photoelectron spectroscopy has been used to determine the oxidation state of nickel in the oxidized nickel (II) dimethylglyoxime complex. Core level binding energies for the Ni(2p), N(1s), and O(1s) levels; the presence or absence of shake-up satellites on the Ni(2p) levels; and the analysis of intensity data ar…
X-ray diffraction measurements have been carried out on the nematic phase of nBABA (n = 1 to 9). Our results show that this nematic phase is a fibre type one having in addition to the orientational long range order, two types of short range orders, (SROs): (i) one dimensional correlations of the molecular dimers along…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarizability of polyethyleneR. H. Boyd and L. KesnerCite this: Macromolecules 1987, 20, 8, 1802–1806Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://pubs.acs.org/doi/10.1021/ma00174a017https://doi.o…
Abstract α, β‐Bis(hydroxyphenol) tetramethyl bisphenol‐A polysulfone (PSUT) was synthesized by two different methods, one using a strong base, the other using a weak base. The bifunctional polysulfone containing tetramethyl bisphenol‐A chain ends was exploited as a model telechelic that can be used for the preparation…
AC impedance spectroscopy is applied to monitoring the chemical-physical condition of polymer dispersed liquid crystals (PDLC). The results define an approach for non-destructive evaluation as the PDLC is designed into informational displays. Response. functions are linked to electrical properties of the constituents…
The presence of an amorphous thermal oxide film on an aluminum surface causes continuous incremental structural changes in a subsequently grown amorphous anodic oxide. This has been studied by measurement of oxide dissolution rates and by DTA analysis of stripped films. Thin films of thermal + anodic oxide have the sa…
Bidri vessels have been manufactured in India from at least the seventeenth century until the present day and are known to be made of a zinc alloy, decorated with inlays of silver, brass or, occasionally, gold. The inlays contrast strikingly with the matt black patina of the vessel. It is this patina, easily damaged b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSignificance of entropic factors in mechanical deformation of polymeric glassesRobert R. Matheson Jr.Cite this: Macromolecules 1987, 20, 8, 1847–1851Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://pu…