Materials Literature
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We present extensive modeling of the amorphous silica surface, aimed at connecting its structural and chemical features. beta-cristobalite surfaces are initially studied to model the hydroxylated surfaces. A model reconstruction of the (111) surface is used to define a path leading to the formation of two-membered sil…
Bi 2 Sr 2 Co 2 O 9 (BC-2202) polycrystalline materials with a layered structure have been prepared by partial melting. The chemical compositions of the samples are Bi2Sr2Co2Ox (2202), Bi1.8Sr2Co2Ox (Bi-1.8), and Bi2Sr1.8Co2Ox (Sr-1.8). All three samples are p-type conductors. The electric properties, namely, the Seebe…
Vertically aligned carbon nanotubes were synthesized on Ni-deposited Si substrates using microwave plasma-enhanced chemical vapor deposition. The grain size of Ni thin films varied with the rf power density during the rf magnetron sputtering process. We found that the diameter, growth rate, and density of carbon nanot…
Silicon nanocrystals were formed in SiO2 using Si ion implantation followed by thermal annealing. The nanocrystal-doped SiO2 layer was implanted with Er to a peak concentration of 1.8 at. %. Upon 458 nm excitation the sample shows a broad nanocrystal-related luminescence spectrum centered around 750 nm and two sharp E…
Effects of lattice strain on magnetic behavior of epitaxial La0.67Sr0.33MnO3 thin films grown by 90° off-axis sputtering have been studied. The size of epitaxial strain was varied using four different substrates, i.e., (001) LaAlO3, (001) SrTiO3, (001) La0.3Sr0.7Al0.65Ta0.35O9, and (110) NdGaO3. The observed magnetism…
The mechanisms of the adsorption of stereoregular polymers are only poorly understood. This work is devoted to the study of the influence of PMMA tacticity and conformation on the interfacial behavior of the polymer. 1 H NMR usually used to determine the tacticity of PMMA in solution in CDCl 3 can also be applied to s…
The effects of N - and C -methyl substitution on electrical and spectral properties of pyrrole, 2,2‘-bipyrrole, and the corresponding polymers were investigated. The whole series of monomethyl and N - or C β -dimethyl-substituted 2,2‘-bipyrroles was synthesized, and the electrochemical and spectral properties of all t…
The structure of ionic aggregates in commercially important ethylene ionomers was studied by small-angle X-ray scattering (SAXS). The samples examined were sodium and zinc salts of poly(ethylene- co -13.3 mol % methacrylic acid) (EMAA) ionomers, which were found to be noncrystalline unlike commercially available EMAA…
A study of the reduction of nitric oxide (NO) by n -butane, in simulated conditions of a reburning zone, has been undertaken in a fused silica jet-stirred reactor operating at 1 atm. The temperatures ranged from 1100 to 1450 K, the initial mole fraction of NO was 1000 ppm, and that of n -butane was 2000−2200 ppm. The…
Inorganic−organic hybrid SiO 2 sol−gels anchored with amino (NH 2 −CH 2 CH 2 −NH-, TMSen, and −NH−CH 2 CH 2 −NH-, Bis-TMSen) and mercapto (HS-) ligands have been studied as new sorbents for Cu 2+ separation. The TMSen-anchored gels were found to be selective for Cu 2+ removal in the presence of Cd 2+ and Zn 2+ . In co…
The interaction forces between high molecular weight polystyrene brushes ( M n = (0.7−1.2) × 10 6 g/mol), formed by radical chain polymerization from an initiator chemically bound to silica (quartz-glass) substrates, were measured with a surface forces apparatus. Because of the high grafting densities obtained (7−10 n…
The structures of ices III and V have been studied under their thermodynamic conditions of stability by neutron diffraction. The results clearly indicate partial ordering of the water molecule orientations for both ice structures. For ice V the ordering is both pressure and temperature dependent, while no significant…
From the reaction of cis -[(cyclam)Fe III (Cl) 2 ]Cl (cyclam = 1,4,8,11-tetraazacyclotetradecane) with hydroxylamine in water the octahedral nitrosyliron complexes trans -[(cyclam)Fe(NO)Cl](ClO 4 ) ( 1 ) and cis -[(cyclam)Fe(NO)I]I ( 2 ) have been isolated as crystalline solids. EPR spectroscopy and variable-temperatu…
We use conducting-tip atomic force microscopy (AFM) to measure local electronic properties of single wall carbon nanotube (SWNT) circuits on insulating substrates. When a voltage is applied to the tip and AFM feedback is used to position the tip, images formed from the tip-sample tunnel current have single tube resolu…
Zhao et al. [Phys.Rev.B 58, 13824 (1998)] depicted several atomic structures of domain boundaries on a Si(111) surface and criticized the article by the present author and the co-workers. I will point out that their criticism is incorrect and their structure models have no consistency.
A hybrid molecular dynamics (MD) algorithm which combines a full MD description of solute–solute and solute–solvent interactions with a mesoscale treatment of solvent-solvent interactions is developed. The solvent dynamics is modeled on a mesoscale level by coarse graining the system into cells and updating the veloci…
A detailed study of the role that solution pH plays in the layer-by-layer processing of the weak polyelectrolytes poly(acrylic acid) and poly(allylamine hydrochoride) was carried out. It was found that dramatically different polymer adsorption behavior is observed as one systematically increases (or decreases) the cha…
In previous studies nonionic organofunctional silicones were shown to enhance the intimacy of protein−silicone interactions at solid−liquid interfaces. In the current studies the same phenomenon was shown to manifest itself, even more clearly, at liquid−liquid interfaces. Proteins or silicones by themselves were unabl…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTMesoporous Gallium Oxide Structurally Stabilized by Yttrium OxideMitsunori Yada, Masahumi Ohya, Masato Machida, and Tsuyoshi KijimaView Author Information Department of Applied Chemistry, Faculty of Engineering, Miyazaki University, Miyazaki 889-2192, Japan Cite this: Langmuir…
Ethylene 2,6-naphthalenedicarboxylate cyclic oligomers (ENCs) were prepared by the ring/chain equilibration (cyclodepolymerization) of poly(ethylene 2,6-naphthalenedicarboxylate) (PEN) in dilute solution of biphenyl and polymerized with antimony trioxide. ENCs thus prepared consisted of a distribution of oligomeric sp…