Materials Literature
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The compatibilizing effect of poly(hexamethylene oxide) (PHMO) on the synthesis of polyurethanes based on α,ω-bis(6-hydroxyethoxypropyl) poly(dimethylsiloxane) (PDMS) was investigated. The hard segments of the polyurethanes were based on 4,4′-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol. The effects of the…
The prospect of developing magnetic qubits is discussed. The first part of the article makes suggestions on how to achieve the coherent quantum superposition of spin states in small ferromagnetic clusters, weakly uncompensated antiferromagnetic clusters, and magnetic molecules. The second part of the article deals wit…
Room-temperature pulsed plasma polymerization of long-chain perfluoroacrylates produces well-adhered liquid-repellent (hydrophobic and oleophobic) films. Critical surface tension values as low as γ c = 4.3 mN m - 1 have been measured on coated flat glass substrates. X-ray photoelectron spectroscopy, Fourier transform…
Octakis(3-hydroxypropyldimethylsiloxy)octasilsesquioxane (OHPS) can be synthesized by direct hydrosilylation of allyl alcohol with octakis(dimethylsiloxy)octasilsesquioxane, (HSiMe 2 O)Si 8 O 12 (Q 8 M 8 H ), using platinum divinyltetramethyldisiloxane [Pt(dvs)] as catalyst. Surprisingly, C-hydrosilylation occurs in p…
The ultrastructure and morphology of potato (Solanum tuberosum L.) tuber cells were investigated by optical, scanning, and transmission electron microscopies. After removal of starch granules, pectins and hemicelluloses were solubilized under alkaline conditions. The alkaline insoluble residue consisted mainly of prim…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
In this work we report on the pressure dependence of the refractive index of indium selenide (InSe) for polarization perpendicular to the c -axis ( E ⊥ c ). The refractive index dispersion n ⊥ (ω) of InSe has been measured between 0.77 and 1.5 eV for hydrostatic pressures up to 8 GPa and interpreted through a single o…
Upon increasing the temperature, a lyotropic mixture consisting of sodium dodecyl sulfate (SDS), butanol, toluene, and brine solution, with oil and water in equal volumes (midrange mixture), has been shown to order spontaneously into two kinds of cubic crystalline arrays exhibiting Fd 3 m and Pm 3 n symmetries. Cubic…
The structural and electronic properties of liquid As 2 Se 3 mixtures are studied by ab initio molecular dynamics simulations. We detail the temperature dependence of the atomic structure by calculating the correlation functions in a real space as well as in a reciprocal space. It is found that the network structure c…
First-principles molecular dynamics simulations of liquid tellurium at 1123 K and at continuously varied densities are presented. The question of why recent studies within density functional theory overestimated the number of nearest neighbours is analysed in terms of structure factors and contributions of different n…
Water addition to molecular single, double and triple M-O-M bridges (M = Sc, Ti, V, Cr, and Mn) were considered, and the stabilities toward stepwise hydrolysis of the oxygen bridges were studied by means of quantum chemistry. The M-O bond distances for the studied systems were compared to experiment for demonstration…
EXAFS, conductivity and Hall coefficient measurements have been carried out for liquid As-Te mixtures. EXAFS analysis reveals the presence of chemical disorder marked by the existence of homopolar As-As and Te-Te pairs. At high temperature around 500 °C the network structure composed of threefold coordinated As atoms…
The effects of various organic monolayers on the surface of porous silicon on the electrochemiluminescence (ECL, also referred to as electroluminescence in the literature) characteristics were investigated. Surfaces were terminated with alkyne, alkene, and alkyl functionalities through cathodic electrografting (CEG),…
The results of ab initio calculations on a series of [MH] n polyhedral cages (M = C, Si, Ge, and Sn; n = 4, 6, 8, 10, 12, 16, 20, and 24) are presented. The energies are partitioned into contributions from each ring to obtain an estimate of how strain changes as a function of ring size for each of these elements. Resu…
The phase transformations under elevated pressure have been followed in situ by X-ray and Raman spectroscopy for ultrahigh-molecular-weight polyethylene (UHMW−PE) reactor powder. Using the in situ X-ray as a reference for the Raman work, it has been shown that Raman spectroscopy is a convenient method to follow phase…
The optical absorption and photoluminescence (PL) of ZnO loaded in mesoporous silica have been investigated. These ZnO/SiO 2 composites are synthesized by impregnation of mesoporous silica with an aqueous solution of zinc acetate, followed by firing at 550 °C. A significant blue shift of the absorption edge compared t…
Azobenzenes having different positional substituents were dissolved in cholesteric liquid crystals to make cholesteric pitches tunable by photoisomerization. E -to- Z photoisomerization of 3,3‘-disubstituted or 2,2‘-dimethyl-3,3‘-disubstituted azobenzenes resulted in a moderate change or even no change in the maximum…
Ab initio calculations based on the density-functional pseudopotential approach have been used to study the electronic structure and chemical bonding in layered machinable Ti 3 SiC 2 ceramic. The calculations reveal that all three types of bonding - metallic, covalent and ionic - contribute to the bonding in Ti 3 SiC…
Hydrothermal reactions of the V2O5/2,2':6':2"-terpyridine/ZnO/H2O system under a variety of conditions yielded the organic-inorganic hybrid materials [V2O4(terpy)2]3[V10O28].2H2O (VOXI-10), [VO2(terpy)][V4O10] (VOXI-11), and [V9O22(terpy)3] (VOXI-12). The structure of VOXI-10 consists of discrete binuclear cations [V2…
The brucite-like Ca 2+ /Al 3+ layered double hydroxide (LDH), Ca 2 Al(OH) 6 ·NO 3 ·2H 2 O, was synthesized using the coprecipitation method. The dicarboxylate anion 1,4-benzenedicarboxylate can be selectively intercalated into the layered double hydroxide Ca 2 Al(OH) 6 ·NO 3 ·2H 2 O from an aqueous solution containing…