Materials Literature
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A novel method is described for preparing high-quality thin films which exhibit an abrupt resistivity change of 4 - 5 orders of magnitude at about ; this is the best result among those so far prepared on non-crystal substrates. To show the difference from the ordinary sol - gel method which uses vanadium alkoxide as p…
The probability, , of losses of N and O atoms on Pyrex walls was determined from a fit of calculated to measured concentrations [O] and [NO] in a low-pressure glow discharge in , for percentage concentrations . The kinetic model used for calculations includes a detailed description of the processes occurring in the di…
Electric fields have been used in the processing of thin film, liquid crystal thermosets to produce cured network structures selectively oriented either parallel or perpendicular to a film substrate. Orientation, which depends on both the liquid crystal nature of the thermosets and their dielectric anisotropy, is sele…
This paper presents an overview of semiconductor ultraviolet (UV) detectors that are currently available and associated technologies that are undergoing further development. At the beginning, the classification of UV detectors and general requirements imposed on these detectors are presented. Further consideration are…
We study surface diffusion in the framework of a generalized Frenkel-Kontorova model with a nonconvex transverse degree of freedom. The model describes a lattice of atoms with a given concentration interacting by Morse-type forces, the lattice being subjected to a two-dimensional substrate potential which is periodic…
Molecular dynamics simulations are used to investigate the atomic mobility and diffusivity of a generalized Frenkel-Kontorova model which takes into account anharmonic (exponential) interaction of atoms subjected to a three-dimensional substrate potential periodic in two dimensions and nonconvex (Morse) in the third d…
The relationship between solid-state morphology and heat-deflection temperature (HDT) of nucleated polypropylenes was studied. Using optical microscopy to characterize the morphology and DMTA to determine the temperature dependence of the tensile modulus, a composite model was adapted to estimate the HDT. Both compres…
The swelling behavior of the complex film formed from pectin and chitosan was studied. The swelling degree increased sharply in the case of pH less than 2 and larger than 7. The swelling mechanisms of the complex film in acidic and alkaline medium are discussed, respectively. Moreover, the swelling degree could be mod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChromophoric Self-Assembled SuperlatticesShlomo Yitzchaik and Tobin J. MarksView Author Information Department of Chemistry and the Materials Research Center, Northwestern University, Evanston, Illinois 60208-3113 Cite this: Acc. Chem. Res. 1996, 29, 4, 197–202Publication Da…
The aging of high-density polyethylene (HDPE) when exposed to drastic climatic conditions (Canadian winter, characterized by low temperature and abrupt temperature variations between the night and the day) was studied. The importance of degradation was determined by evaluating the microstructural changes in HDPE (i.e.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleThe Ionic Auxiliary Concept in Solid State Organic PhotochemistryJanet N. Gamlin, Ray Jones, Mordechai Leibovitch, Brian Patrick, John R. Scheffer, and James TrotterView Author Information Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, Canada…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiscrete Silanetriols: Building Blocks for Three-Dimensional MetallasiloxanesRamaswamy Murugavel, Vadapalli Chandrasekhar, and Herbert W. RoeskyView Author Information Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, GermanyCite this: Acc. Chem. Res. 19…
We present a new method for establishing and exploiting a multicanonical distribution for Monte Carlo sampling across an extended space of macrostates, with particular reference to the study of first-order phase transitions. The method exploits the information contained in measurements of the transition rate between m…
Self-diffusion in a suspension of spherical particles in steady linear shear flow is investigated by following the time evolution of the correlation of number density fluctuations. Expressions are presented for the evaluation of the self-diffusivity in a suspension which is either raacroscopically quiescent or in line…
The vibrational spectrum of C$_{60}$ is compared to the spectrum of a classical isotropic elastic spherical shell. We show correlations between the low frequency modes of C$_{60}$ and those of the spherical shell. We find the spherical model gives the approximate frequency ordering for the low frequency modes. We esti…
A system of three particles undergoing inelastic collisions in arbitrary spatial dimensions is studied with the aim of establishing the domain of ``inelastic collapse''---an infinite number of collisions which take place in a finite time. Analytic and simulation results show that for a sufficiently small restitution c…
A phenomenological model of the evolution of an ensemble of interacting dislocations in an isotropic elastic medium is formulated. The line-defect microstructure is described in terms of a spatially coarse-grained order parameter, the dislocation density tensor. The tensor field satisfies a conservation law that deriv…
Defect structures in a homoepitaxial diamond film grown by chemical vapor deposition have been studied by cross-sectional transmission electron microscopy. Many interstitial dislocation loops are discerned in the (001) interface. The internal region grown on the (11̄1) facet comprises stacking faults and twins, while…
We present the results of large-area (20 cm2) diamond deposition from a scaled-up stagnation-flow reactor. The reactor uses a unique nozzle geometry that optimizes reagent gas usage. The premixed acetylene–oxygen–hydrogen flames were operated in a highly strained configuration, allowing uniform deposition of diamond w…
Impulsive stimulated light scattering experiments were carried out on an ionic glass former Ca0.4K0.6(NO3)1.4 to determine the temperature dependence of the Debye–Waller factor fq(T) in the q→0 limit and to investigate the structural relaxation dynamics. A square-root cusp anomaly was observed in fq→0(T) at a crossove…