Materials Literature
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A series of polystyrene- random -poly(methyl methacrylate) (PS- r -PMMA) copolymers with different compositions, adsorbed from toluene onto silica, were studied with modulated differential scanning calorimetry (MDSC). The equilibrium adsorbed amount increased monotonically with an increase in the methyl methacrylate (…
Abstract Substituted barium hexaferrites, BaFe 12‐2x Zn x Ti x O 19 (0 ≤ x ≤ 2), have been synthesized by thermal decomposition of freeze‐dried acetate precursors. Decomposition and phase formation were investigated by means of thermal analysis, XRD and IR spectroscopy. The initially amorphous decomposed precursor rea…
The hydrothermal reaction of NaVO(3).H(2)O, barbituric acid, NH(2)NH(2).2HCl, H(3)PO(4), and H(2)O gave a novel heteropolyoxovanadate Na(6)[(P(V)O(4))V(V)(6)V(IV)(12)O(39)](2).H(3)PO(4).31H(2)O (1) and an unexpected phase Na(2)[C(12)H(6)N(6)O(9)].7H(2)O (2). The basic building blocks in 1 are the six-capped sphere-sha…
A novel mixed-valence polyoxomolybdenum anion, [Mo(V)(7)Mo(VI)O(16)(O(3)PPhPO(3)H)(4)](3)(-), was synthesized hydrothermally from molybdenum oxide, molybdenum metal, boric and phosphoric acids, 1,2-phenyldiphosphonic acid, and imidazole (ImH) and was structurally characterized as an imidazolium salt (orthorhombic, Aba…
Abstract Highly crystallized BaMoO 4 films were prepared on molybdenum substrates in Ba(OH) 2 solutions by electrochemical method at room temperature. The deposition conditions (reaction temperature and current density) during electrochemical formation were researched. The films were characterized by using the X‐ray D…
Salmonella enterica, in contrast to Escherichia coli K12, can use 2-deoxy-D-ribose as the sole carbon source. The genetic determinants for this capacity in S. enterica serovar Typhimurium include four genes, of which three, deoK, deoP, and deoX, constitute an operon. The fourth, deoQ, is transcribed in the opposite di…
Thin walled, carbon tubular structures (see Figure and also cover) with varying inner diameters in the form of nozzles, straight tubes, tube‐on‐cones, and funnels have been synthesized by in‐situ control of gallium‐carbon wetting behavior using gas phase chemistry. In addition, carbon tubular structures with large int…
Numerical simulations are performed to follow the evolution of an initial density of dislocation loops in an infinite strained layer to the point where the dislocations have stopped moving. Several unexpected results are obtained. First, many of the threading arms are either annihilated or prematurely immobilized by h…
A combined approach has been used to study thermal effects on the extended x-ray absorption fine-structure (EXAFS) of copper between 4 and 500 K. A phenomenological data analysis shows that the thermal expansions measured from the first and third cumulants significantly differ between each other and from the crystallo…
Abstract This work explores the use of photoactive elastomers as elastic holographic materials. Holographic gratings were recorded on stretched films of an azobenzene elastomer, which is composed of a side‐chain liquid‐crystalline polymer with azobenzene mesogens, grafted to the rubbery polybutadiene block of a styren…
Abstract L‐histidine tetrafluoroborate (L‐HFB) a semiorganic nonlinear optical material has been synthesized in aqueous solution at 50°C and characterized by FT‐IR and FT‐Raman spectroscopy studies. The solubility was determined in different solvents such as water, methanol and water mixture of methanol. The single cr…
The tilted smectic liquid‐crystal phase of an ester‐based bent‐core mesogen (see Figure) is optically isotropic due to the combination of suitable tilt and opening angles of the bent cores. In electric fields, V‐shaped switching between isotropic and birefringent states is observed. Both the antiferroelectric and ferr…
A nonlinear optical polymer , which is thermoreversibly crosslinkable (see Figure), has been developed to overcome the nonlinearity–stability trade‐off in poled polymers. High poling efficiency has been achieved after controlled, mild lattice hardening via the Diels–Alder crosslinking reaction. The resulting material…
Eleven different peptide-core dendritic macromolecules, each having a [G2] poly(benzyl ether) dendritic wedge (Den) at the peptide side chain, N-terminal, or C-terminal, were synthesized, and their potentials as macromolecular organic gelators were investigated in MeCN. Among these candidates, side-chain-dendronized B…
By utilizing highly aligned graphitic nanotubes embedded with gold nanoparticles an efficient field‐emission device can be constructed. These have been synthesized by first preparing composite nanotubes consisting of poly( p ‐phenylenevinylene) and Au nanoparticles by chemical vapor deposition polymerization, followed…
The structural/morphological and oxygen handling properties of two high-surface-area Ce−Tb mixed oxides prepared by a microemulsion method with Ce/Tb atomic ratios of ca. 4 and 1 have been analyzed in a multitechnique study (HREM, XEDS, XRD, Raman, XPS, O 2 - -EPR, adsorbed methoxy IR, and C 18 O 2 isotopic exchange).…
A variety of novel BaCrO 4 nanostructures , such as nanobelts and their tree‐like superstructures (see Figure), have been synthesized in a unique catanionic reverse micelle system by simply changing the mixing ratio between the anionic and cationic surfactants. This synthetic method provides a simple, novel method for…
Abstract Electrically conducting nanocomposites of bismuth metal and insulating ceramic phases of SiO 2 and MgO were generated via high‐energy ball milling for 24 h using zirconia milling media. The resulting nanocomposites contain Bi nanoparticles with sizes down to 5 nm in diameter. The morphology is a strong functi…
Time-resolved photoluminescence measurements were used to study the passivation kinetics of luminescence-quenching defects, associated with Si nanocrystals in ${\mathrm{SiO}}_{2},$ during isothermal and isochronal annealing in molecular hydrogen. The passivation of these defects was modeled using the generalized simpl…
Stable endothelialization of a tissue-engineered heart valve is essential for proper valve function, although adhesive characteristics of the native valve endothelial cell (VEC) have rarely been explored. This research evaluated VEC adhesive qualities and attempted to enhance VEC growth on the biopolymer chitosan, a n…