Materials Literature
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The theory of nematic-smectic phase transition in the system of uniform semi-flexible chains with hard-core repulsion is presented. Both the general density-functional formalism the tube-model calculation show that the flexibility of the chains results in a strong first-order transition, in contrast to the common weak…
We present simulations of metallization morphologies under ionized sputter deposition conditions, obtained by a new theoretical approach. By means of molecular dynamics simulations using a carefully designed interaction potential, we analyze the surface adsorption, reflection, and etching reactions taking place during…
One approximation is made to describe a M+1 electron many-body wavefunction by a M electron many-body wavefunction and a single electron wavefunction. Under this approximation, we have derived the Coulomb energy which relates the exciton energy $E_{exc}$ in a quantum dot with the quasiparticle band gap (defined as the…
Borophosphates (intermediate compounds of the system M x O y −B 2 O 3 −P 2 O 5 −(H 2 O)) contain complex anionic structures built of BO 4, BO 3, and PO 4 groups and their partially protonated species, respectively. A first approach to the development of a structural chemistry of borophosphates is based on linking prin…
The incorporation of the five following porphyrins: meso-tetra(4-phenyl)porphyrin (TPP); meso-tetra(4-sulfonato-phenyl)porphyrin (TPPS4); meso-tetra(4-naphthyl)porphyrin (TNP); tri-sulfo-tetra-phenyl porphyrin (TPPS3) and tetra-sulfonato-naphthyl porphyrin (TNPS4) into human blood cells was investigated using flow cyt…
The multichannel CH + NO reaction was studied, at room temperature, in a low-pressure fast-flow reactor. CH was obtained from the reaction of CHBr 3 with potassium atoms. The overall rate constant was found to be (1.9 ± 0.5) × 10 -10 cm 3 molecule -1 s -1 . The relative branching ratios of NH(A 3 Π) + CO and NCO(A 2 Σ…
Build up and classification of pressure-sensitive products physical basis of PSPs chemical basis of PSPs adhesive properties of PSPs manufacture of PSPs converting properties of PSPs end use of PSPs.
The design and chemical synthesis of two de novo four-helix bundle proteins is described; each protein has two bound cofactors. Their construction from purified peptides is based on the modular assembly of different amphiphilic helices by chemoselective coupling to a cyclic peptide template. In the hydrophobic interio…
We study the effects of solute interactions on osmotic transport through pores. By extending single-file, single-species kinetic models to include entrance of solute into membrane pores, we model the statistical mechanics of competitive transport of two species across membrane pores. The results have direct applicatio…
Extrusion of glass rods, tubes and core/clad performs of melt-derived, special glasses is being investigated to satisfy demand for preforms from which optical fiber can be drawn. These glasses include: heavy metal oxide, chalcogenide, halide as well as mixed systems such as oxyhalide, chalcohalide, and oxychalcogenide…
The magnetoresistance and resistance relaxation after a discontinuous field change of (LCMO) and thin film structures was investigated. We compare the magnetoresistance and resistance relaxation of epitaxial films, polycrystalline films, mechanically induced grain boundaries and heterostructures in current-perpendicul…
The transport and magnetic properties of A-site-deficient perovskite have been investigated. The electrical conductivity displayed a thermally activated temperature dependence between 200 and 300 K with an activation energy of 0.17 eV. The thermopower measured over a similar temperature range showed little temperature…
We have investigated the effects of Mn impurities on Ba0.7Sr0.3TiO3 thin films using x-ray photoemission spectroscopy. Mn acts as an electron acceptor, compensating for the charge density found in nominally undoped films. This causes a greatly increased depletion width in acceptor-doped films. We also present evidence…
X-ray microbeam techniques (spot size=3×20 μm2) have been applied to characterize the composition and structure of rare earth activated Gd(La, Sr)AlO3 phosphor thin films grown by combinatorial synthesis. Using x-ray fluorescence, x-ray diffraction and near-edge x-ray absorption spectroscopy, we have measured the chem…
The fatigue properties of the sol–gel derived Pb0.99[(Zr0.6Sn0.4)1−XTiX]0.98Nb0.02O3 (40/100X/2) thin films deposited on platinized silicon substrates were investigated as a function of Ti content (0.03⩽X⩽0.15). With an increase of Ti content X, the antiferroelectric phase was transformed to the ferroelectric phase an…
The thermoelectric figure of merit is calculated for a compound material comprising thin semiconductor and wider metallic layers. The layers are perpendicular to the direction of current. The semiconductor barriers exclude electrons with energies ε<μ from the current. This exclusion increases thermopower. One m…
Intense short-wavelength photoluminescence (PL) observed at room temperature from thermal SiO2 films co-implanted with Si and C is reported. A flat Si profile was first implanted, followed by 1100 °C annealing for 60 min. C ions were subsequently used to be implanted into the same depth region. PL was observed from th…
Photoemission spectra of polycrystalline CdO have been measured under excitation with monochromatic x-rays and with variable energy UV radiation from a synchrotron source. Experimental data are compared with density of states profiles calculated by periodic Hartree-Fock and density functional methods. Both calculation…
Amorphous “diamond-like/quartz-like” composites a-(C:H/Si:O) constitute a novel class of diamond-related materials with a number of unique bulk and surface properties. Using a thermal imaging microscope we have determined the thermal conductivity (κs) of a-(C:H/Si:O) films deposited on Si(001) substrates. We have deve…
The charge ordering in , which occurs on cooling the ferromagnetic metallic ground state, is readily destroyed on application of a magnetic field of 6 T. For , for which the ground state is charge ordered, on the other hand, magnetic fields have no effect on the charge ordering. In order to understand such a marked di…