Materials Literature
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A phenomenological description of the dynamical correlations in a fluid confined between two parallel solid walls, using a generalization of Onsager's theory of fluctuations, is presented. Besides the bulk viscosity, this description involves parameters characterizing the boundary conditions. Correlations functions ob…
Here we study the interplay between wetting and phase separation for a nearly symmetric binary mixture confined in a one-dimensional (1D) or a two-dimensional (2D) capillary. It is found that near the symmetric composition, the hydrodynamics unique to bicontinuous phase separation plays a crucial role in the wetting d…
The structural properties and the phase transition between the B1 (rock salt) and B2 (CsCl) phases of NaCl have been investigated at an ab initio level. Total energy curves, obtained with periodic Hartree-Fock (HF) calculations, have been corrected a posteriori by integrating the HF charge density according to the cor…
Coherent intermediate scattering functions are measured by dynamic light scattering for several wave vectors around the structure factor peak on metastable colloidal fluids and glasses of hard spherical particles. The results are quantitatively described by a combination of the \ensuremath{\alpha} and \ensuremath{\bet…
Long-lived phosphorescence and thermoluminescence (TL) from UV-irradiated SrO powders under high vacuum are observed at low temperature. Phosphorescence decays following a t -1 law below 160 K in the time range 10-103 s. The emission spectra of phosphorescence and TL have a peak at 2.7 eV. The luminescence is quenched…
Abstract The application of photosensitive polyimides in electrical and optical interconnection technology is discussed. Critical properties of two photosensitive polyimide formulations with significantly different structural chemistries have been compared. Polyamic ester based formulations such as Selectilux® HTR3 sh…
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Abstract The character of mixing was interpreted through the energy consumption. It was correlated with the quality of mixing which is described by two parameters: average degree of dispersion and coefficient of heterogeneity. Experiments were carried out for polyethylene-based compounds with various fillers and typic…
Bulk, semiconducting GaxTe100-x (17 ≤ x ≤ 25) glasses are prepared by the meltingh quenching method and electrical resistivity measurements are carried out at high pressures up to 8 GPa and low temperatures down to 77 K in a Bridgman anvil system. It is found that all the GaxTe100-x, glasses exhibit metallization unde…
Abstract A new family of positive photosensitive polyimide (PPI) systems composed of solvent soluble polyimides (Pls) with cyclobutane (CBDA) structures and diazonaphthoquinone compounds (DNQ) has been prepared. Heat and catalytic imidizations were carried out to obtain CBDA Pls; the former was better than the latter…
Abstract An introduction to nonlinear optics (NLO) and the major challenges in the field of NLO‐properties of polymeric materials, is given in this paper. Methods for the investigation of nonlinear optical properties of [4‐(2‐methacryloxyethyl)methylamino]‐4′‐cyanoazobenzene copolymers with methyl methacrylate (MMA) a…
An inherently fringe stable interferometer, with uniform recording-plane exposure, produces transmission gratings with uniformly high efficiency. The surface-relief structures recorded in positive photoresist are ideal for their transfer into specialized candidate materials. These structures have many applications in…
The effects of the thickness, uniaxial anisotropy field, electrical resistivity and addition of other elements on the frequency dependence of permeability in Fe-Zr-N films were investigated. Film thicknesses were varied up to 8 μm. The purpose of this study was to identify the main origin of the high-frequency loss in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolytetrafluoroethylene fiber-based composite antifriction coatingsAlexander S. KuzharovCite this: Ind. Eng. Chem. Res. 1993, 32, 5, 763–773Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https://pubs.acs.org/doi/…
Abstract Toray's ionic‐type photosensitive polyimide, “Photoneece”, is widely used as an interdielectric and as a protection layer for microelectronics, because of its properties, such as the removal of photoreactive groups at low temperature, excellent thermal, mechanical and electrical film properties and excellent…
Buildup factors are reported for the absorbed dose in air resulting from point isotropic sources of monoenergetic photons with energies from 10 to 100 MeV. Factors were calculated from photon fluences computed by the EGS4 code for coupled photon and electron transport. Comparisons are made with results of moments meth…
Diatom taxa of the genus Mastogloia collected near Lee Stocking Island, Bahamas and in Shark Bay, Australia were observed to produce extracellular structures. The shape, arrangement, and number of these structures is species-specific and related to the number of partecta. Structures observed in 20 Mastogloia taxa incl…
The avoidance of condensation problems in the future depends on designers having available accurate and reliable vapour permeability values. The emergence of free trade within the European Community requires the transferability of measurement data between countries, as well as between individual laboratories. This pap…
Phase transitions of orthorhombic sulfur were investigated above 10 GPa by Raman spectroscopy using red light excitation. Transitions into several phases that have been reported in previous studies using green light excitation, are confirmed. The phase behaviour is observed to depend strongly on the preparation method…
The acetone-sensitized irradiation using UV-B (ultraviolet light, 280-320 nm; sunlamps) of thymidylyl(3'-->5')deoxyfluorouridine monophosphate produces two main photoproducts. The distribution of these photoproducts is dependent on the pH of the irradiation solution. At pH 6, the cis-syn cyclobutane-type photodimer is…