Materials Literature
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Immobilization of acid phosphatase (ACP) in mesoporous or, more generally, nanoporous silica has been accomplished via the sol-gel reactions of tetramethyl orthosilicate in the presence of ACP and of D-glucose (DG) as a nonsurfactant template, which is subsequently removed by water extraction after the formation of na…
The direct proportionality relation between the boson peak maximum in glasses ${\ensuremath{\omega}}_{b}$ and the Ioffe-Regel crossover frequency for phonons ${\ensuremath{\omega}}_{d}$ is established. For several investigated materials ${\ensuremath{\omega}}_{b}=(1.5\ifmmode\pm\else\textpm\fi{}0.1){\ensuremath{\omega…
The emission bands of the 4.2, 3.2 and 2.6 nm sized ZnS:Eu2+ nanoparticles are peaking at 670, 580 and 520 nm, respectively. The emission of the 4.2 nm sized nanoparticles originates from the recombination of the Eu2+-bound exciton, while the emission of the 3.2 and 2.6 nm sized nanoparticles is from the Eu2+ intra-io…
A crystallographic interpretation of a possible transition mechanism from the wurtzite to the NaCl type is given. For this purpose, different atoms in the structures of both types are replaced by like ones, resulting in lonsdaleite-type configurations and in cubic primitive lattices, respectively. The atomic arrangeme…
We present a systematic study on the adsorption of NO and CO in Cu−ZSM-5, using an ab initio embedded cluster methodology at the B3LYP level of theory. We found that the effects of the cluster size and Madelung potential are small for adsorption energies of CO and NO. For adsorption of CO, the calculated binding energ…
Carbon nanotubes (CNTs) are grown vertically aligned on Fe catalytic particles deposited on a silicon oxide substrate at temperatures ranging from 550 to 950 °C by thermal chemical vapor deposition of acetylene. All CNTs have a bamboolike structure in which the curvature of compartment layers is directed toward the ti…
The simultaneous interaction of methyl radicals (CH3) and atomic hydrogen (H) with the surface of amorphous hydrogenated carbon (a-C:H) films is investigated by using quantified radical beam sources. The growth and/or erosion of the films during the interaction of the H and CH3 radical beam with the surface is monitor…
PURPOSE: To assess the renal tolerance of 1.0 mol/L gadobutrol as an electrically neutral contrast agent at magnetic resonance (MR) imaging in patients with impaired renal function. MATERIALS AND METHODS: Twenty-one patients with impaired renal function were enrolled in this prospective randomized study and classified…
We have studied the feasibility of doped eutectic SbTe alloys for practical application in digital video recording (DVR) rewritable phase-change media for high-numerical-aperture (NA=0.85) and blue-wavelength (λ=405 nm) recording. Remaining issues such as thermal cross-erase in land/groove recording and the thermal st…
The present paper investigates the oxidation kinetics of BN-ZCM composite ceramics in the temperature range of 1473K-1773K. Oxidation experiments with powder and plates of BN-ZCM composite ceramics have been carried out in air. Oxidation kinetics, products and structures of BN-ZCM have been examined and discussed. The…
Abstract Jojoba wax was chemically bonded to polyethylene—in film or hollow fiber form—via a stable sulfonamide bond. The jojoba‐bonded polyethylene was obtained by binding allyl amino jojoba derivatives to chlorosulfonated polyethylene. The amount of jojoba added to the polymer ranged from 9 to 98% (w/w), depending o…
Polymer-stabilised liquid crystals are systems in which a small amount of monomer is dissolved within a liquid crystalline host, and then polymerised in situ to produce a network. The progress of the polymerisation, performed within electro-optic cells, was studied by establishing an analytical method novel to these s…
The effect of the initial α‐Al 2 O 3 particle size in the reaction‐bonded aluminum oxide (RBAO) process on the phase transformation of aluminum‐derived γ‐Al 2 O 3 to α‐Al 2 O 3 , and subsequently densification, was investigated. It has been demonstrated that if the initial α‐Al 2 O 3 particles are fine (∼0.2 μm, i.e.,…
An experimental study of the sizing of submicron particles on semiconductor wafers is presented. The objective of the study was to determine the accuracy of a state-of-the-art optical wafer scanner, by comparing its size response with that of two well established techniques, namely, differential mobility analysis (DMA…
Temperature dependence of the Debye-Waller factors in EXAFS is studied for monatomic fcc lattice by use of the perturbation approach in terms of temperature Green's function. We apply the theory to the temperature dependence of EXAFS for Kr and Ni crystals. Furthermore we make a comparison among sc, bcc and fcc lattic…
Abstract Quantitative X-ray microanalysis requires the use of many fundamental constants related to the interaction of the electron beam with the sample. The current state of our knowledge of such constants in the particular areas of electron stopping power, X-ray ionization cross-sections, X-ray fluorescence yield, a…
Effects of (i) local magnetic ordering, (ii) lattice distortions, and (iii) Mn 3d - O 2p hybridization on the shape of Mn K- edge XANES spectra of La1-xCa(x)MnO3 have been evaluated numerically and compared with available experimental data. We calculated the spin-polarized Mn K-edge spectra. An energy splitting betwee…
Polycrystalline lead iodide, PbI 2 , was recrystallized from hot water to reproducibly obtain flat plate-like crystals, which manifested extreme preferred orientation greatly favoring the 001, 002, 003, and 004 planes. Polycrystalline samples of PbI 2 were intercalated with tripropylamine, simultaneously producing a “…
Rates of continuous tritium recovery from a Flibe stream are calculated for a permeation window and a counter-current gas-bubble column. The area of the permeation window is estimated to be comparatively small unless very low tritium partial pressure is demanded for the system. It is probable that the tritium transfer…
The nuclear performance of the thin Convective Liquid Flow First Wall (CLiFF) concept is investigated. Liquid walls offer the advantage of protecting solid structure behind them from excessive damage from neutrons originated in the plasma and thus have the capability for high power density applications; the central re…