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The mode coupling equations describing the ideal glass transition in simple liquids are generalised to treat binary mixtures. These equations are solved numerically to obtain the phase diagram, the glass order parameters, and the exponents ruling the long time dynamics of a soft sphere model for which numerical simula…
Amorphous C:H containing silicon film shows an extremely low friction coefficient of 0.007 when the film is rubbed with a steel ball in a vacuum. This film is deposited on steel with an electron cyclotron resonance plasma of ethylene and silane. Polarized microinfrared spectroscopy reveals that high lubrication perfor…
The scanning photoelectron microscope at the National Synchrotron Light Source (NSLS) has recently recorded micrographs with a resolution below half a micron. To demonstrate elemental and chemical sensitivity at the submicron level, an artificial structure consisting of Al and SiO2 lines on a boron-doped silicon subst…
Abstract Water‐soluble Mannich bases were synthesized from cardbisphenol by Mannich reaction and were characterized by 1 H‐NMR and 13 C‐NMR spectroscopic methods. The effect of electrodeposition parameters on the film formation from binders and from the pigmented composition were studied. The polymers gave uniform coa…
The simultaneous measurement of thermal response and infrared spectra on specimens of microscopic dimensions was demonstrated for polymer melting and crystallization of polymer blends. The measurement technique was achieved by combining a differential scanning calorimeter (DSC) having provision for microscopic observa…
Abstract The anhydride curing of epoxides was studied by performing copolymerizations of epichlorohydrin, phenyl glycidyl ether (PGE), or bisphenol‐A‐diglycidyl ether (BADGE) with phthalic anhydride (PSA). As initiators, tertiary amines or ammonium salts were used. In the case of epichlorohydrin, linear polyesters wer…
Abstract A heat‐resistant rubber blend of natural rubber NR and styrene butadiene rubber (SBR‐1502) was prepared according to the standard techniques. The rubber blend was loaded with different concentrations of LAMP black and general purpose furnace (GPF) black for obtaining conductive rubber composites. The obtained…
Nanometer-scale thin-film heterogeneities are important for determining the magnetic properties of amorphous, soft magnetic films.1 The remanent-magnetization distributions in ultrasoft films appear to result from the balance of magnetostatic and exchange energies associated with the nanometer-scale heterogeneity.2 In…
Pentaerythritol is a synthetic polyalcohol with the formula C 2OH)4, obtained in the reaction of one acetaldehyde molecule with four molecules of formaldehyde. This reaction takes place in a dilute aqueous solution in the presence of alkaline catalysts. Besides the pentaerythritol a salt of formic acid, most often sod…
Abstract The crystallization of octacalcium phosphate (OCP) and dicalcium phosphate dihydrate (DCPD) have been studied at ambient temperature in silica gel using double diffusion system. The first stage of evolution of the OCP spherulites as well as their growth have been observed by optical microscopy. The growth rat…
Compositionally modulated TbFe and TbFeCo amorphous films were prepared on glass substrates by the bias-modulated sputtering method. The modulated structure was confirmed for modulation lengths larger than 14 Å by X-ray small angle diffraction. Sharp layer boundaries were clearly observed using cross-sectional TEM. Th…
A phenomenological model for the dielectric anomaly at the incommensurate-ferroelectric phase transition in [N(CH3)4]2XCl4 (X=Co, Zn) is presented. A first order transition between the incommensurate phase (in a sinusoidal regime) and the ferroelectric phase is assumed. A divergency of the dielectric susceptibility of…
Radiation enhanced sublimation (RES) of graphite leads to potentially high erosion rates in advanced fusion devices (Compact Ignition Tokamak, CIT) and (the International Thermonuclear Experimental Reactor ITER) and may be important in the ‘‘carbon blooms’’ observed in Tokamak Fusion Test Reactor (TFTR) and the Joint…
Abstract 1,2‐Bis( p ‐aminophenyl)tetramethyldisilane was synthesized from 1,2‐dichlorotetramethyldisilane and 4‐[ N,N ‐bis(trimethylsilyl)amino]phenyllithium. The diamine was reacted with various aromatic diacid chlorides giving disilane‐containing aromatic polyamides (aramids), whose inherent viscosities were between…
The crystallization behavior of amorphous CdGe x As 2 , where the x values were varied from 0 to 1.2, was studied in order to document the effect of germanium on the amorphous structure. The glass‐forming tendency of amorphous CdGe x As 2 was evaluated by Hruby's criterion. The crystallization mechanism of each group…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. S. Glass, V. M. Bermudez; Infrared study of high pressure and high temperature coadsorption of…
The kinetics of polymerization of racemic and optically active mandelic acid were determined under a variety of conditions. The initial rate of monomer consumption in the reaction with racemic mandelic acid was approximately twice that for the single enantiomer for acid-catalyzed reactions in benzene solution. A signi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of 2-(2-hydroxyphenyl)-2H-benzotriazole monomers and studies of the surface photostabilization of the related copolymersF. A. Bottino, G. Di Pasquale, A. Pollicino, Antonino Recca, and D. T. ClarkCite this: Macromolecules 1990, 23, 10, 2662–2666Publication Date (Pr…
The combination of some additions and substitutions to sintered Nd-Fe-B magnets was investigated in order to obtain high coercivity and good thermal stability. Some additions (Al,Ga,Nb,W) and a substitution (Dy for Nd) give Nd-Fe-B-based sintered magnets high coercivities without a large remanence loss. Small differen…
The morphology, systematics and ecology of a new centric diatom—CycZotelZa cretica, from Lake Kournas in the island of Crete, Greece—are reported. The morphological variation and ultrastructure of the diatom are described as revealed by light and scanning electron microscopy. The species is characterised by a smooth f…