Materials Literature
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Grafting a 4-fold alumina multilayer inside the nanotubes of a wide-pore MCM-41 material, by consecutive reactions with Al(O -sec -Bu) 3 followed by hydrolysis−calcination, changes the surface chemical functionality of the material from silica to alumina. This procedure leads to partial filling of the MCM-41 mesopores…
We study the morphology of asymmetric A8B48A8 triblock copolymer thin films confined between two homogeneous surfaces (walls). Morphology is investigated as a function of the film thickness and the strength of the wall–polymer interaction. For very thin films we observe cylinders perpendicular to the walls for a wide…
The reaction of sodium nitrite with sodium dithionite was studied in the presence of cobalt(II) tetrasulfophthalocyanine, COII(TSPc)4-, in aqueous alkaline solution. The overall mechanism comprises the reduction of CoII(TSPc)4- by dithionite, followed by the formation of an intermediate complex between COI(TSPc)5- and…
Electrochemical polymerization of aniline onto a gold electrode surface in an aqueous electrolyte solution containing a small amount of polyelectrolyte, i.e. , sodium poly(styrenesulfonate) (Na-PSS), and the characterization of the resulting polyaniline (PAn)/poly(styrenesulfonate) (PSS) composite have been studied us…
Optical absorption of silver nanoparticles dispersed within pores of monolithic mesoporous silica was investigated after annealing in different atmospheres. It has been found that treatment in H2 or N2 induces a strong surface plasmon resonance (SPR) as usually expected, but air annealing results in the disappearance…
It is known that the organic disulfides reductively cleave to corresponding two thiols and oxidatively recombine to parent disulfides by appropriate conditions. Therefore, we examined the applications of organic disulfides as electrode active materials for the lithium batteries. Dibenzo[ c , e ][1,2]dithiin ( 2 ), nap…
In the preceding publication, we showed that the hyperbranched polystyrenes (HBPS) synthesized as part of this study may be viewed as starlike molecules with a high branch density, which are either unentangled or weakly entangled. In this paper, the role of architecture, especially the branch density, on the rheologic…
Ferroelectric (Bi,La)4Ti3O12 (BLT) thin films with different Bi2O3 template layers were prepared on Pt/Ti/SiO2/Si substrates by a chemical-solution deposition method. The BLT films with a thin Bi2O3 bottom layer and those with a thin Bi2O3 intermediate layer had a (117) preferentially oriented growth after annealing a…
In silica glass, the peak position of infrared absorption spectrum at around 2260 cm−1, which is related to the average of distribution of Si–O–Si bonding angle, is useful for determining frozen-in temperature of glass structure, the so-called fictive temperature. We precisely determined relation between the peak posi…
Self-consistent polymer reference interaction site model (PRISM) calculations and molecular dynamics (MD) simulations were performed for a blend of isotactic polypropylene (iPP) and polyethylene (PE) at various compositions and chain lengths. United atom models were used for both components. Both PRISM theory and MD s…
Two layered vanadyl selenites with the compositions, [DABCOH2]0.5[(VIVO)(HSeO3)(SeO3)].H2O,I, and [enH2][(VivO)2-(VVO)O2(SeO3)3]-.1.25H2O, II, have been prepared by the reaction of NaVO3 with SeO2 or H2SeO4 under hydrothermal conditions in the presence of organic amines. Crystal data: I, orthorhombic, space group Pbcn…
Using a quasi-Monte Carlo scheme, we search the potential energy surface of crystalline pentacene to sample its local minima, which represent the “inherent” structures, i.e., the possible configurations of mechanical equilibrium. The system is described in terms of rigid molecules interacting through a standard atom–a…
Remanent polarizations (Pr) of 200-nm-thick epitaxial Pb(Zr0.35,Ti0.65)O3 (PZT) thin films deposited on (001), (110), and (111) SrTiO3 (STO) substrates coated with SrRuO3 (SRO) were compared to the domain configurations that were precisely and quantitatively characterized by high-resolution x-ray diffraction reciproca…
High-purity boron nitride (BN) nanofibers with diameters ranging from 30 to 100 nm were synthesized. Electron energy loss spectroscopy revealed that they have stoichiometric BN composition. The hydrogen uptake capacity measurements showed that the fibers could adsorb 2.9 wt % hydrogen under ∼10 MPa at room temperature…
The electron transport properties of three-terminal carbon-nanotube junctions are investigated within the Landauer theory of quantum conductance. Using a realistic tight-binding Hamiltonian, we demonstrate that the experimentally observed rectifying behavior is not an intrinsic property of the junction, but rather of…
Numerical simulation models to analyze the expansion behavior of the interconnector and the resulting stresses under the cell operating conditions were proposed. This model calculation was the first precise analysis including most phenomena which should be considered in terms of stress and mechanical reliability of th…
Measurement of optical properties such as the refractive index and thickness of nanocrystalline or smooth diamond films is carried out by the prism coupling technique. The films observed to be absorbing for a standard operating wavelength of 633 nm and higher wavelengths, i.e., 830 and 1300 nm, were used to obtain sha…
We use an instanton approximation to the continuous-time spin coherent-state path integral to obtain the tunnel splitting of classically degenerate ground states. We show that provided the fluctuation determinant is carefully evaluated, the path integral expression is accurate to order O(1/j). We apply the method to t…
Polymer architecture plays an important role in the solution, rheological, mechanical and processing behavior. In this series of two papers, we explore the role of branching, especially branch density, on the conformation and rheology of homopolymers. A series of model star-core hyperbranched polystyrenes (HBPS) with…
The two-electron reduction/oxidation reactions of manganese oxide in alkaline electrolytes have been investigated in the presence and absence of bismuth oxide by both galvanostatic discharge/charge and linear sweep voltammetry followed by examining the products with X-ray diffraction. Although the presence of bismuth…