Materials Literature
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A relatively new technique based on the sequential adsorption of oppositely charged polymers affords the fabrication of multilayer thin films with controlled molecular architectures. In this work, we report the first study on the impedance and dielectric characteristics of multilayer films created by the sequential ad…
We use a tight-binding total energy method, with parameters determined from a fit to first-principles calculations, to examine the newly discovered gamma phase of titanium. Our parameters were adjusted to accurately describe the alpha Ti-omega Ti phase transition, which is misplaced by density functional calculations.…
We propose a unified moving boundary problem for surface growth by electrochemical and chemical vapor deposition, which is derived from constitutive equations into which stochastic forces are incorporated. We compute the coefficients in the interface equation of motion as functions of phenomenological parameters. The…
This paper, based on a presentation at the Spintronics 2001 conference, provides a review of our studies on II-VI and III-V Mn-doped Diluted Magnetic Semiconductors. We use simple models appropriate for the low carrier density (insulating) regime, although we believe that some of the unusual features of the magnetizat…
We have studied growth and properties of quaternary alloy magnetic semiconductor (InGaMn)As grown both on GaAs substrates and on InP substrates by low-temperature molecular-beam epitaxy (LT-MBE). (InGaMn)As thin films were ferromagnetic below ~30 K, exhibiting strong magneto-optical effect. The lattice constant of [(I…
Unilamellar titania crystallites of Ti 1- δ O 2 4 δ - ( δ = 0.0875) and polydiallyldimethylammonium chloride have been alternately deposited layer-by-layer onto various substrates from their aqueous media. An atomic force microscopy (AFM) image visualized the adsorbed nanosheets, which gave efficient coverage of the s…
We demonstrate logic circuits with field-effect transistors based on single carbon nanotubes. Our device layout features local gates that provide excellent capacitive coupling between the gate and nanotube, enabling strong electrostatic doping of the nanotube from p-doping to n-doping and the study of the nonconventio…
A theoretical expression giving the collision-induced hyper-Rayleigh (CI HR) spectrum due to pairs of centrosymmetric molecules of octahedral symmetry has been derived. The dipole2-quadrupole hyperpolarizability light scattering mechanism of collision-induced hyperpolarizability ΔβLM is discussed in detail and propose…
Gelator-catalyst interactions allow the transcription of the organogel structure of methyl-4,6-O-(p-nitrobenzylidene)-alpha-D-glucopyranoside (1) into its silica analogue, even in the absence of positive charges or H-bonding sites on the gelator molecule which, until now, were considered indispensable.
A hierarchically structured composite ion conductor film (AgI nanorod/γ-Al2O3) was chemically prepared using nanoporous anodic aluminium oxide (AAO) as a template, where ion conducting AgI nanorods (av. diameter = 75 nm) are periodically aligned within a hexagonally organized insulating Al2O3 matrix.
The first polyoxomolybdenum carbonate has been synthesized and its single crystal structure as well as its IR, UV-vis and 13C NMR spectra have been determined.
We develop a replica generalization of the reference interaction site model (replica RISM) integral equation theory to describe the structure and thermodynamics of quenched-annealed systems comprising polar molecular species. It provides a successful approach to realistic models of molecular liquids, and properly allo…
It is shown that the direct precursor for the formation of a photochrome in Schiff bases is a “twisted” geometry S1 state of a keto tautomer in which the O⋯N–H hydrogen bond is broken. In photochromic Schiff bases this state is close in energy to the ππ* state of the cis-ketone obtained from the initially optically ex…
Simulations are presented for microlens arrays prepared via photopolymerization-induced phase separation in liquid crystal/monomer mixtures based on four-wave mixing, viz., interference of two horizontal waves and two vertical waves. The microlens forming process has been simulated on the basis of a pattern-photopolym…
We study static packings of frictionless and frictional spheres in three dimensions, obtained via molecular dynamics simulations, in which we vary particle hardness, friction coefficient, and coefficient of restitution. Although frictionless packings of hard-spheres are always isostatic (with six contacts) regardless…
Egg capsule material serves as a putative protection mechanism for developing snail embryos facing the perils of the marine environment. We conducted the first quantitative study of this acellular structural protein with the goals of characterizing its chemical and mechanical properties and the relationship of these p…
We present molecular dynamics simulations of lithium silicate melts (Li2O)x(SiO2)1−x with Li2O concentrations x = 0.01, x = 0.1 and x = 0.5 in equilibrium conditions for temperatures down to 1500 K. The partial pair correlation functions are determined and compared with recent experimental data. The dynamics of the in…
Highly dispersed chromate species on silica catalyse the selective epoxidation of propene to propene oxide (PO) by molecular oxygen under visible light irradiation with the same quantum yield as that under UV light irradiation.
The segment density profile of anchored layers of poly(dimethylsiloxane) in good solvents has been measured using neutron reflectometry. Two types of layers have been studied: end-grafted layers (brushes) and irreversibly adsorbed layers, on silicon/silicon dioxide. The latter can be viewed as a polydisperse brush of…
The monolayer dispersion of tungsten oxide on the surface of anatase has been studied by BET surface area measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transformation infrared spectroscopy (FTIR) and Raman spectroscopy. The results reveal that for the anatase supported tungsten…