Materials Literature
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Interstitial ${\mathrm{H}}_{2}$ becomes bound to interstitial O in silicon, forming an ${\mathrm{O}\ensuremath{-}\mathrm{H}}_{2}$ complex. Infrared absorption experiments performed for the O-HD complex in Si reveal HD vibrational lines that appear at elevated temperature $(T>10\mathrm{K}).$ These lines and their pr…
A novel five-membered cyclic thiocarbonate bearing adamantane moiety, 4,6-dioxatetracyclo[6.3.1.1. 3,10 0 3,7 ]tridecane-5-thione ( 1 ), was synthesized from 1,2-adamantanediol and thiophosgene in the presence of pyridine. Monomer 1 underwent cationic ring-opening polymerization initiated by triethyloxonium tetrafluor…
Profile search methods based on protein domain alignments have proven to be useful tools in comparative sequence analysis. Domain alignments used by currently available search methods have been computed by sequence comparison. With the growth of the protein structure database, however, alignments of many domain pairs…
We report on confined two-dimensional (2D) dipole clusters formed by small ferromagnetic particles floating at the liquid-air interface and confined by nonuniform external magnetic field. The particles self assemble into hexagonally ordered clusters whose lattice constant can be magnetically tuned. We study the area S…
Excitation at 350−355 nm of the dyads PAu − Ir, PH 2 − Ir and of the triads PH 2 − Ir − PAu and PZn − Ir − PAu where Ir, iridium(III) bis-terpyridine, is covalently linked to gold (III), free-base and zinc(II) tetraaryl-porphyrins ( PAu, PH 2, PZn ), produces to a predominant extent the ligand centered triplet excited…
synthesised. The thermal decomposition of these metal complexes was investigated by TG, DTG and DTA. A GC-MS combined system was used to identify the products during pyrolytic decomposition. The pyrolytic end-products were identified by X-ray powder diffraction. The thermoanalytical data of these complexes are present…
Abstract The synthesis of well‐defined 3‐ and 4‐miktoarm star copolymers of the A 2 B and A 3 B types is described, where A is 1,4‐polybutadiene and B is poly(1,3‐cyclohexadiene). The synthetic approach involves the reaction of poly(1,3‐cyclohexadienyl)lithium with an excess of methyltrichlorosilane or tetrachlorosila…
Abstract A new N ‐phenylated amide ( N ‐phenylamide) unit containing aromatic diamine, N , N ′‐bis(3‐aminobenzoyl)‐ N , N ′‐diphenyl‐1,4‐phenylenediamine, was prepared by the condensation of N , N ′‐diphenyl‐1,4‐phenylenediamine with 3‐nitrobenzoyl chloride, followed by catalytic reduction. Two series of organosoluble…
Abstract The polystyrene–silica hybrid materials have been successfully prepared from styrene and tetraethoxysilane in the presence of silane‐coupling agents by an in situ sol‐gel process. Triethoxysilyl group can be incorporated into polystyrene as side chains by the free‐radical copolymerization of polystyrene with…
We studied the influence of π-orbital coupling in a 1D stack of 4,4‘-biphenyldithiol (BDT) on the resulting electronic and electrical properties of the assembly. The conduction and the field-switching properties of the BDT assembly are compared as the intermolecular distances are reduced to below 4 Å. The system in th…
The adsorption of pyrazole onto silver colloids has been investigated by surface-enhanced Raman scattering (SERS) experiments for normal and deuterated ligand and by ab initio density functional theory (DFT) calculations performed for surface complex models. The best agreement between observed and calculated frequenci…
Dissolution of the (104) surface of magnesite (MgCO 3 ) was studied as a function of bulk solution pH over the range 2.0 < pH < 5.0 at 60 °C using atomic force microscopy (AFM) with well-defined hydrodynamics. The experimental data and corresponding solution of the convective-diffusion equation for the system revealed…
The steady state and time resolved phophysical properties of a novel self-assembling lyotropic discotic liquid crystal, 2,3,6,7,10,11-hexa-(1,4,7-trioxaoctyl)-triphenylene (TP6EO2M) are reported. The spectral changes that accompany the formation of linear aggregates in D2O provide no evidence of excited-state delocali…
Abstract Styrene–butadiene rubber (SBR) and nitrile rubber (NBR) were reinforced with silica by the sol–gel method of tetraethoxysilane (TEOS) in latex. The sol–gel reaction proceeded in the mixture of latex, TEOS, water, and a catalyst. The compound that involved silica was crosslinked with the curing agent at 150°C.…
Abstract The graft crosslinking polymerization of 4‐ tert ‐butylstyrene (tBS) and divinylbenzene (DVB) onto ethylene–propylene–diene (EPDM) was carried out in toluene by using benzoyl peroxide (BPO) as an initiator. The synthesized graft terpolymer, tBS‐EPDM‐DVB (PBED), was extracted with tetrahydrofuran (THF) into ge…
Density functional theory (DFT) calculations of the energetics, molecular structures, and spin density profiles of metalloporphyrin pi-cation radicals suggest that the common practice of describing these radicals in terms of a universal A(1u)/A(2u) dichotomy is often not justified, confirming a possibility first fores…
We have measured the steady drainage of foams of various surfactants, varying the size of the parietal plateau borders from 0.24 to 2.4 mm. We report an evolution of the power laws of drainage with the bubble size, which cannot be explained by the most recent developments of the drainage theory. We believe that one re…
Redox polyelectrolyte multilayers have been assembled with use of the layer-by-layer (LBL) deposition technique with cationic poly(allylamine) modified with Os(bpy)(2)ClPyCHO (PAH-Os) and anionic poly(styrene)sulfonate (PSS) or poly(vinyl)sulfonate (PVS). Different behavior has been observed in the formal redox potent…
The kind and degree of crystalline phase orientation for clathrate s-PS films, obtained by solution-casting procedures, and for semicrystalline films, obtained by suitable treatments on these cast films, are analyzed. Clathrate as well as nanoporous form films can present high degrees of uniplanar orientation, corresp…
TDDFT calculations confirm a controversial proposal by DiMagno and co-workers that ruffling distortions, by themselves, do not bring about sizable red shifts in the electronic absorption spectra of "simple" nontransition-metal porphyrins. We now report that the same also holds for saddling distortions. The situation i…