Materials Literature
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In this work, the mechanical behavior of hybrid circular braids without a core under tensile loads is studied experimentally and analytically. A predictive model of the mechanical response of the braids based on the constituent yarn characteristics and machine parameters is developed. The structural geometry of the fa…
When a mixture is confined, one of the phases can condense out. This condensate, which is otherwise metastable in the bulk, is stabilized by the presence of surfaces. In a sphere-plane geometry, routinely used in atomic force microscope and surface force apparatus, it, can form a bridge connecting the surfaces. The pr…
Vinyltrimethylsilane (VTMS) was used as a precursor for the deposition of SiCOH films by direct and remote plasma-enhanced chemical vapor deposition (PECVD). Film property was compared with films prepared with tetramethylsilane (4MS). As-deposited films and the films annealed at 450°C have been characterized. The grow…
The synthesis of novel donor–π–acceptor dyads based on a pyrrolo-annelated tetrathiafulvalene unit is described. The linear and non-linear optical properties of these chromophores have been investigated, together with their redox properties. For a dyad containing a p-nitrophenyl acceptor group, a significant third-ord…
Silicon carbide has been used as a post-irradiation temperature monitor since first proposed for this use in 1961. The basic technique has been the repeated measurement of the length of a SiC monitor following isochronal annealing. This technique has been shown to overestimate irradiation temperature by ∼100°C. This p…
A newly synthesized donor meso-DMBEDT-TTF [DMBEDT-TTF = 2-(5,6-dihydro-1,3-dithiolo[4,5-b][1,4]dithiin-2-ylidene)-5,6-dihydro-5,6-dimethyl-1,3-dithiolo[4,5-b][1,4]dithiin] afforded a superconducting salt beta-(meso-DMBEDT-TTF)2PF6, with a transition temperature at 4.3 K (onset) under a hydrostatic pressure of 4.0 kbar.
ZnO-based thin-film transistors (TFTs) have been fabricated by depositing ZnO (radio-frequency sputtering) on /p-Si substrates at various temperatures ranging from room temperature to 300°C. When rapid thermal annealing in a forming gas ambient was used for H treatment on ZnO, the TFTs prepared at 200°C exhibited a hi…
The electrical conductivity and melting behavior of alkali molten carbonates, Li 2 CO 3 and K 2 CO 3 , coexisting with oxide particles, γ LiAlO 2 and MgO, have been investigated. The conductivity was measured by the ac impedance method. The melting of carbonates caused an abrupt change in the electrical conductivity…
The New Zealand blackfoot abalone, Haliotis iris Gmelin, is among the few gastropods that precipitate both calcite and aragonite in their shells. The location, composition, and thickness of these mineral layers may affect color, luster, and strength of the shell, which is locally important in jewelry manufacture. Skel…
The silica-supported Zr(iv) dihydride [(triple bond)SiO)2ZrH2] reacts quickly and completely with methane to yield [(triple bond)SiO)2ZrMe2] through the intermediate [(triple bond)SiO)2ZrHMe], while its monohydride analogue [(triple bond)SiO)3ZrH] yields the monomethylated product [(triple bond)SiO)3ZrMe] slowly and i…
In this paper, n-type lead telluride (PbTe) compounds without doping were sucessfully prepared at high pressure and high temperature (HPHT). The carrier type was induced by the effect of pressure. The results of the electrical conductivity, Seebeck coefficient, thermal conductivity for n-type PbTe, which were measured…
The addition of ammonium chloride to a precursor solution improved the luminescence intensity of the phosphor synthesized by spray pyrolysis without postheating. With this addition, the luminescence intensity under vacuum ultraviolet (146 nm) excitation was increased 1.6 times, and reached 88% of a commercial phosphor…
Mesoporous titanium dioxide (TiO2) materials have been synthesized by a novel simple, template-free synthetic approach, which was carried out via nitric acid-catalyzed hydrolysis and polycondensation reactions of titanium(IV) n-butoxide. The as-prepared and calcinated mesoporous TiO2 materials are characterized by X-r…
ABSTRACT The availability of Fe(III)‐bearing minerals for dissimilatory Fe(III) reduction was evaluated in sediments from a petroleum‐contaminated sandy aquifer near Bemidji, Minnesota (USA). First, the sediments from a contaminated area of the aquifer, in which Fe(III) reduction was the predominant terminal electron…
Hexagonal hollow ZSM-5 tubes were synthesized using mesoporous silica with a worm-like morphology as the template. A new method for aluminium incorporation during the hydrothermal synthesis step was developed.
Abstract Summary: The applications of polyelectrolyte complexes range from large‐scale industrial products to special uses in biotechnology and medicine, yet one significant problem is their instability against changes in their environmental conditions, particularly the addition of salts. This concerns the colloidal s…
Four homologous series of symmetric bent-core molecules containing lateral fluorine or iodine substituents in the branches were synthesised and studied. Depending on the central ring and the lateral substituent the studied compounds exhibit a B7 phase or B2 type phases with anticlinic (SmCAPA) or synclinic (SmCSPA) in…
This work describes the use of hydrogen peroxide as oxidant for the selective oxidation of some alcohols in the presence of hexadecyl trimethyl ammonium decatungstate catalyst under simple reaction conditions. It includes the oxidation of cyclohexanol to cyclohexanone in the temperature range of 90 to 100 °C for 2 hou…
Ultra-thin multilayer films consisting of polyoxotungsceriumate cluster K17[CeIII(P2W17O61)2]·30H2O [Ce(P2W17)2] and polyallylamine hydrochloride were fabricated on quartz and ITO substrates by a layer-by-layer self-assembly method. The multilayer films were characterized by UV-vis spectra, cyclic voltammetry (CV) and…
A new amorphous high-Tg azo polymer with benzothiazole group in the side chain, poly{2-{4-[[N-(2-methacryloyl)ethyl]-N-ethyl]phenylazo}-6-nitro-benzothiazole} (pBTAMC), was prepared and its optical storage properties were investigated in thin films. Comparison is made with three push-pull azobenzene polymers: poly{4-[…