Materials Literature
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The desorption of surfactant may be a problem in the development of admicellar catalysis for organic synthesis or for wastewater cleanup. The formation of hydrocarbon aggregates chemically bonded to mineral oxide surfaces has been investigated to solve this problem. In this study, octadecyltrichlorosilane (ODS) was ch…
The time-averaged forces exerted by a sound field between two gas bubbles, normally called Bjerknes forces, are examined. The surrounding medium is assumed to be an incompressible viscous liquid. It is shown that the acoustic streaming, which develops around the bubbles due to viscosity, adds one more term to the Bjer…
This study of the shear strength of fibrous sheets first measures the in-plane shear strengths of various samples, including woven and nonwoven fabrics and paper, using a custom-made apparatus attached to an Instron tester. The structure of the apparatus and the measurement procedures are introduced in this article. T…
The stress-strain response of Zr due to twinning is distinctly different from that due to slip as a function of temperature and strain rate. When the applied stress is lower than the transition stress, dislocation slip is the dominant deformation mechanism. The traditional MTS model is shown to adequately represent th…
This paper describes the effects of some polar organic additives on the sol−gel processing of organodisilicate and silica precursors. For a range of organic additives investigated, those for which molecular stacking is a feature of the crystal structure (type A) promote extensive fragmentation of organosilicate and si…
The aims of this study are to realize under which conditions adiabatic shearing occurs, and to better understand the formation and variations of the adiabatic shear band of Ti-6A1-4V alloy subjected to high strain rate and high temperature conditions with microstructural observation. The cylindrical specimens are firs…
Hydrogenated carbon nitride ( C 1- x N x :H) thin films were successfully deposited on Si and quartz substrates by the rf plasma chemical vapor deposition (PCVD) technique. A gas mixture of trimethylamine ( (CH 3 ) 3 N) and ammonia ( NH 3 ) introduced to a reaction chamber as material gases was decomposed by glow disc…
<abstract language="eng">Nanocomposites obtained by the encapsulation of conducting polymers such as polyaniline and polydiphenylamine in 2H-MoS2 and 1T-TiS2 are synthesized and characterized by X-ray diffraction and infrared spectrophotometry. The synthesis consists in intercalating the layered compound with n-butyll…
BaTiO 3 tin films are promising for electronic and optoelectronic devices . Current growth techniques give rather low deposition rates for practical applications. Here epitaxial growth rates over 100 times higher have been achieved using aerosol CVD with surface diffusion enhancement in the presence of Bio‐containing…
Abstract Ferruginous beidellites with Al:Fe atomic ratios up to 2.36 were obtained when solutions containing Al, Fe 2+ and H 4 SiO 4 were adjusted to pH 8.5 with Ca(OH) 2 and incubated at 95 °C in the presence of CaCO 3 as a pH buffer. Incubation took place under cyclic reducing and oxidizing conditions achieved by ad…
The physical structure of poly(methylphenyl) silane (PMPS) has been investigated using wide-angle x-ray scattering at various temperatures and optical polarizing microscopy. The results obtained by these techniques clearly show the existence of an ordered phase in PMPS. The crystallinity of our sample was estimated to…
We have investigated the orientational order in the nematic glass formed by the side group liquid crystal polymer poly[6-(4-methoxy-4‘-oxyazobenzene)hexyl methacrylate]- co -poly[methyl methacrylate] using ESR spectroscopy. In one experiment the order of the polymer backbone was investigated using a nitroxide attached…
Study of p -type porous silicon has been carried out by x-ray reflectometry for the first time. Its critical total-external-reflection angle and its reflection coefficient in the subcritical angle range are much smaller than for c -Si, which was grown by the Czochralski method. The critical angle decreases with increa…
Single crystals of the compounds SrZn(VO)(PO 4 ) 2 (I) and BaCd(VO)(PO 4 ) 2 (II) have been prepared by solid state reactions in evacuated quartz tubes. X-ray investigations confirmed orthorhombic symmetry, space group D 15 2h -Pbca, lattice constants a/b/c (I): 9.066(1)/9.012(1)/17.513(1) Å and (II); 8.838(4)/8.915(4…
The dispersion of longitudinal stress waves as they propagate in pressure bars distorts the shape of the puise, and so can be a limitation to the accuracy of high strain rate tests such as the compressive split Hopkinson pressure bar (SHPB). The method of dispersion correction described in this paper is based on a bar…
The temperature dependence of dc and ac conductivity in the vicinity of Tc3 = 112.5 K (on heating) for the MABB crystal was measured. For ac conductivity the frequencies between 20 Hz and 1 MHz were applied. The behaviour of conductivity was explained by means of power law [sgrave]ac = [sgrave]dc + Aωp, where ω is the…
Lattice dynamics calculations are presented for the synthetic cyclosilicate ${\mathrm{BaCuSi}}_{2}{\mathrm{O}}_{6},$ which contains isolated four-membered silicate rings. The results are analyzed in relation to published claims that vibrational modes of similar rings are responsible for the sharp ${D}_{1}$ ``defect li…
Triglycine sulfate-gelatin (TGS-gelatin) films were grown by evaporation of the water from a solution containing gelatin and TGS. The pyroelectric and dielectric properties of the films were highly dependent on their water content. Moist films had higher pyroelectric coefficients and lower coercive fields than dry fil…
Abstract The isolation at −78°C and characterization of the novel crystalline reactive porphinatomanganese(IV) complex Mn‐(TDCPP)(OCl) 2 ( 5 ) is described. 5 is compared with the porphinatomanganese(IV) complexes Mn(TDCPP)(C 6 H 5 IOCl) 2 (2), Mn(TDCPP)(C 6 F 5 10C1)CI ( 3 ) and Mn(TDCPP)(OCH 3 ) 2 , ( 4 ). The stoic…
Describes an investigation into the sensation of wetness and dampness by both subjective and objective measurements. When fabric has a high water content, the subject felt a strong feeling of stickiness. This stickiness was evaluated objectively by measurement of the friction between the wet fabric and artificial skin…