Materials Literature
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Abstract The structural changes during enzymatic hydrolysis of cellulose substrates were studied by SAXS, WAXS, water retention values, and degree of polymerization. LODP cellulose samples in original (cellulose I) and mercerized (cellulose II) form were hydrolyzed using a commercial cellulase preparation produced by…
Abstract Background removal from x‐ray photoelectron spectra (XPS) was evaluated using the Shirley method and the Tougaard method. The effect of background removal over a range of kinetic energy was evaluated, and the Tougaard method was found to be effective over a wide energy range. In this paper we report a modific…
Porous silicon structures are formed by electrochemical etching of silicon in HF solutions. The selective dissolution of silicon results in the formation of a porous structure with a characteristic morphology dependent on the dopant type and concentration, the applied voltage, and the electrolyte composition. The phys…
Blue phases (BP's) in liquid-crystalline systems of high chirality exhibiting a short cholesteric temperature interval are investigated. In a BP I supercooled with respect to the cholesteric phase, the orientation of the cubic lattice with the (1,1,0) wave vector perpendicular to the substrate is spontaneously turned…
Abstract Acid-catalyzed Friedel–Crafts alkylation reactions of p-methylbenzyl chloride with benzene were carried out on four unmodified natural clay minerals. Phenyl-p-tolymethane was quickly and selectively formed in the presence of vermiculite. Although the specific surface area of vermiculite is smaller than those…
Kinetic effects such as coarsening and back diffusion affect the solidification rate and hence the rate at which latent heat of fusion is liberated. Neglecting these effects can bring about errors in macroscopic heat flow simulation. The paper investigates whether these errors are large enough to necessitate interacti…
Abstract The compatibility and crystallization behavior of blends of semicrystalline and amorphous polymers, traditionally used as matrices of high performance composites, has been studied. The analysis has been focused on blends of semicrystalline poly(etheretherketone) (PEEK) with amorphous poly(etherimide) (PEI) pr…
The isomers of 3,4-methylenedioxyamphetamine (MDA) functioned as discriminative stimuli in rats trained to discriminate either (-) MDA (1.25mg/kg) or (+) MDA (1.25mg/kg) from saline. Dose- and time-response curves indicated that drug lever selection occurred at doses of at least 1.00mg/kg of (-) MDA and 0.75mg/kg of (…
Waste and scraps from polyurethane rigid foams, with a glycolysis process, can be transformed into products that are liquid at room temperature and terminated with hydrogen active groups, so that they can be directly recycled in the production process of new rigid foams. The process is a very con venient solution to a…
The binding energies of core electrons in d ‐type stoichiometric diborides of several transition metals were measured by X‐ray photoelectron spectroscopy. Metal core lines in the diborides shifted either to higher or to lower binding energies compared with those appertaining to corresponding elemental states and varie…
The desorption of indium during molecular beam epitaxy (MBE) growth of InGaAs and GaAs/InGaAs/GaAs quantum wells has been investigated by reflection high energy electron diffraction (RHEED). The indium desorption activation energy calculated from the temperature dependence of the InAs growth rate is shown to be almost…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution viscosity of polystyrene at conditions applicable to commercial manufacturing processesDong Min Kim and E. Bruce NaumanCite this: J. Chem. Eng. Data 1992, 37, 4, 427–432Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published i…
Fiber cohesion and bulk properties and their consistency have a significant influence on yarn manufacturing processes and yarn quality. These critical properties depend on several staple fiber properties, including staple length, finish type and level, fiber geometries, crimp type and level, fiber additives, degree of…
Expressions for the generalized probability distributions of failure times obtained from constant-stress and progressive-stress tests are presented. Three types of life models are considered for this purpose, i.e. linear inverse-power and exponential models, and a threshold life model based on the inverse-power law. M…
The new layered material, TaFe1+xTe3 (0.25 < x < 0.29), has been synthesized by reaction of the constituent elements. Single-crystal X-ray diffraction studies show that at x = 0.25 the compound crystallizes in the space group P21m (no. 11) (a = 7.436(1), b = 3.638(1), c = 10.008(1) Å, β = 109.17(1)°). The structure fe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption spectra of tellurium clusters in solid argonParviz Hassanzadeh, Craig Thompson, and Lester AndrewsCite this: J. Phys. Chem. 1992, 96, 21, 8246–8249Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 199…
A nematic layer with opposite boundary conditions (unidirectional planar and homeotropic) is considered, having strong anchoring at the planar wall. It is known that a periodic deformation of splay-type can intervene between the aperiodic hybrid alignment and undistorted planar state as one decreases the film thicknes…
Abstract Evidence of chlorite weathering to halloysite appears to be limited. Trioctahedral ferruginous chlorite occurring in granitic rocks and in situ altered phases isolated from the horizons of two soils in southern Korea were studied by scanning and transmission electron microscope (SEM, TEM), chemical, and X-ray…
A thermogravimetric study was made of the reaction of the zirconia stabilizing oxides, In 2 O 3 , Sc 2 O 3 , Y 2 O 3 , and MgO , with molten NaVO 3 at 800°C under SO 3 partial pressures of 10 +2 to 10 −3 Pa. The melt composition is determined by: 2 NaVO 3 + SO 3 ⇄ V 2 O 5 + Na 2 SO 4 . No reaction of In 2 O 3 was foun…
A stable one-dimensional quasicrystal has been found in slowly cooled Al75Pd15Fe10. The one-dimensional quasicrystal can be derived from a two-dimensional decagonal quasicrystal by introducing a finite linear phason strain. The melting temperature of the one-dimensional quasicrystal was measured to be lower than that…