Materials Literature
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Various aromatic polybenzoxazole (PBO) films were prepared through the two-step silylation method by low-temperature solution polycondensation of trimethylsilyl-substituted bis(o-aminophenol)s with aromatic dicarboxylic acid chlorides yielding precursor poly(o-trimethylsiloxy-amide)s, followed by thermal cyclocondensa…
Sorption and desorption processes of cationic dyes occurring in single silica gel microparticles in an aqueous solution were kinetically studied by microcapillary manipulation/injection and microabsorption methods. The sorption and desorption rates of rhodamine 6G were limited by diffusion of the dye in the particle i…
The composition (% relative abundance) of the benthic diatom community was studied in the littoral zone (0–5 m) of the NW and E coasts of the brackish, non-tidal Gulf of Riga, in the Baltic Sea. The samples were collected concomitantly with measurements of sediment primary productivity and chlorophyll a during three c…
Abstract The control of crystallization is important at all processing stages of the PET bottle industry, from the manufacture of bottle resins to the fabrication of preforms and bottles. In this work, we sought to evaluate critically three methods of crystallinity measurement. We have used density, Differential Scann…
Consolidation of aqueous concentrated suspensions was used to shape alumina green bodies because it enabled us to obtain complex‐shape components with accurate sizes. A high state of alumina particle dispersion was achieved by using (HO) 2 C 6 H 2 (SO 3 Na) 2 (Tiron), which allowed us to obtain stable alumina suspensi…
Strong retardation of photovoltage transients has been observed in porous materials (meso- and nanoporous Si, sintered networks of TiO2 nanoparticles, porous Al oxide) excited by short laser pulse. It has been shown that the photovoltage is mainly determined by the slow carriers diffusion with different diffusion coef…
Abstract Selective oxidation of carbon monoxide in high excess of H2 was examined on noble metal catalysts (Pt, Ru, Pd, Co, and Pt-Ru) supported on mordenite. Pt-Ru/mordenite exhibited fairly high selectivity over a wide flow rate condition even at 150 °C. Thus, it seems to be a promising catalyst for polymer electrol…
Two series of experiments were done to investigate the effect of dislocations on grain growth in SrTiO 3 . In the first series, we observed the growth behavior of a single‐crystal plate toward a TiO 2 ‐excess SrTiO 3 powder compact, containing different dislocation densities on two equivalent {100} surfaces. The surfa…
The statistical kinematical X-ray diffraction theory is developed to describe reciprocal-space maps (RSMs) from deformed crystals with defects of the structure. The general solutions for coherent and diffuse components of the scattered intensity in reciprocal space are derived. As an example, the explicit expressions…
Abstract The gelators of organic solvents are classified into two categories on the basis of their basic intermolecular forces: hydrogen-bonded or nonhydrogen-bonded. To utilize these two interactions cooperatively for organogel formation we newly synthesized seven gelators (1—7) and two reference compounds (8 and 9)…
The deposition of metal nanoparticles (such as Ag, Cu, Au, Pd, and Pt) on boron-doped, polycrystalline diamond thin films grown on silicon substrates was investigated using Raman spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. Nanometer-size metal particles with pre…
The supramolecular structure of new hydrogen-bonded mesogens composed of dipyridyl and 4-(oligodimethylsiloxyl)alkoxybenzoic acids was investigated by X-ray diffraction and deuterium NMR. These H-bonded mesogens exhibit a cubic thermotropic liquid crystalline phase at a temperature below a smectic A phase. Moreover, a…
We present a neutron scattering study over a wide range of wave vectors of the structure of the fragile glass former triphenylphosphite, with an emphasis on the recently discovered, apparently amorphous, glacial phase. Direct evidence is given by small-angle scattering data that the glacial phase has a structural orga…
Experiments and thermodynamic calculations were performed to gain a better understanding of the CVD of Ti3SiC2. The computer program SOLGASMIX-PV was used to calculate deposition diagrams for the TiCl4–SiCl4–CCl4–H2 reagent system. The effects of hydrogen to reagent concentration ratio, temperature, and pressure were…
Resistance–temperature ( R – T ) characteristics were measured directly at single‐grain boundaries in 0.1‐mol%‐niobium‐doped barium titanate bicrystals that had been fabricated from polycrystalline sinters, to determine a geometrical grain‐boundary character dependence of the positive temperature coefficient of resist…
In this study, cotton fabrics are treated at different curing temperatures with different concentrations of 1,2,3,4-butanetetracarboxylic acid (BTCA) catalyzed with sodium hy pophosphite (SHP). Strength retention and wrinkle recovery angle (WRA) are tested, and the results show that high curing temperature and high BT…
CDP-2,3-di-O-geranylgeranyl-sn-glycerol synthase (CDP-archaeol synthase) activity was discovered in the membrane fraction of the methanoarchaeon Methanothermobacter thermoautotrophicus cells. It catalyzed the formation of CDP-2,3-di-O-geranylgeranyl-sn-glycerol from CTP and 2,3-di-O-geranylgeranyl-sn-glycero-1-phospha…
Using specially “designed” electrolytes, it is possible to obtain macropores even in highly doped n-type silicon (0.020–0.060 Ωcm) without illumination. Based on predictions of the “current-burst-model” [phys. stat. sol. (a) 182, 63 (2000), this issue], HF-containing electrolytes were systematically modified with stro…
The fine structure of the exciton ground level in a spherical nanocrystal of a zincblende or a wurtzite structure semiconductor was calculated with the inclusion of short-and long-range (nonanalytical), exchange-interaction components. The band-parameter dependence of the long-range exchange-interaction contribution t…
Strain-induced grain evolution in a 304 type austenitic stainless steel has been studied in multiple compression with the loading direction being changed in each pass. The tests were carried out to total strains above 6 at 873 K (0.5 T m) at a strain rate of about 10-3 s-1. Multiple deformation promotes the rapid form…