Materials Literature
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Abstract Layer‐by‐layer self‐assembled polyelectrolyte films containing a charged cyclodextrin and lipopolysaccharide (LPS) are developed for the first time as a potential model for local endotoxin antagonist delivery. We have examined the biological activity of a lipopolysaccharide from E. coli incorporated into mult…
Abstract Features of the renormalized and twice renormalized Rouse models were examined numerically. Based on numerical evaluations of the generalized Langevin equation in renormalization approaches, nonexponential normal mode autocorrelation functions were derived, that can be described over two orders of magnitude b…
Surface Science: An Introduction , K. Oura , V. G. Lifshits , A. A. Saranin , A. V. Zotov , and M. Katayama Springer-Verlag, New York, 2003. $89.95 (440 pp.). ISBN 3-540-00545-5 Buy at Amazon
Two phase Zr – 2.5 wt-%Nb is used as pressure tube material in water cooled and moderated reactors. The in service behaviour of this hcp zirconium based alloy is dependent on strong textures developed during thermomechanical processing. In the present study, the texture evolution during fabrication of this material, u…
The colloidal QDs of GaAs and CdS semiconductors with the radiuses about 20Å and 30Å correspondingly have been formed by laser ablation method in the liquid media. The optical absorption and the photoluminescence spectra of the GaAs and CdS colloidal QDs have been investigated experimentally and theoretically. The con…
The structure, the frequencies of the normal vibrations, and the absolute intensities of the bands in the IR and Raman spectra of 9,10-anthraquinone and its four symmetrical isotopomers are calculated in terms of the DFT/B3LYP method with the 6-31G(d) basis set. The effective harmonic force field of 9,10-anthraquinone…
This paper provides data on four commercial tree retardant crosslinked polyethylene (TR-XLPE) and one cross-linked polyethylene (XLPE) insulated 15 kV cables supplied by three manufacturers. The cables have "super-smooth" conductor shields and "extra-clean" insulation and insulation shields. AC and impulse voltage bre…
This study was part of a larger effort called the transient dendritic solidification experiment (TDSE), which uses the well known Clapeyron effect to study transient effects in dendritic solidification. The transient behaviour was studied between well defined steady states using pressure mediated changes since it is a…
Abstract Sheet‐like calcite array and stable vaterite were synthesized by bio‐mimetic supported liquid membrane system under different reaction conditions. Both of the FTIR spectra of products showed narrower peak at 1418 cm −1 than that of bulk CaCO 3 , and that of vaterite has a split in this peak.
The deformation behavior of boron‐ and carbon‐doped β‐silicon carbide (B,C‐SiC) with an average grain size of 260 ± 18 nm containing 1 wt% boron was investigated by compression testing at elevated temperatures. Extensive grain growth during deformation was observed. The stress–strain curves were compensated for grain…
N3 center luminescence quenching by the main types of defects (A and B1) related to nitrogen impurity in natural diamond was studied by monitoring the luminescence yield and using the Raman scattering intensity as a measure of the exciting radiation intensity. The luminescence yield from the N3 centers decreases by a…
Scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) have been used to examine the structure of ordered adlayers of Ca on TiO 2 (110)-1×1 formed by metal vapor deposition. A comparison is made with structures formed by segregation of Ca from the bulk, with similar structures being found for t…
The energy exchange processes within Er3+–Yb3+-codoped silica fibers manufactured for high-power optical amplifiers are investigated through luminescent decay measurements and rate-equation modeling. The Er3+ and Yb3+ luminescence, as functions of pump power, exhibit an unquenchable Yb3+ to Er3+ cooperative energy tra…
An optical pressure cell tested at pressures up to 1000 bar is presented. The cell has been used to collect UV-Vis spectra within the temperature range 20–400°C. The cell is compact, has low volume, and atypical high-pressure window seal. To test the performance of the cell the tetrahedral-octahedral equilibria in aqu…
Protonic octatitanate fibers with novel combinational micro-mesoporous structures were prepared by using solvothermal soft chemical process in glycerine. Potassium titanate of K 2 Ti 4 O 9, which has a fibrous morphology and microstructures organized with K 2 O-rich melt on mesoscale, was used as a precursor. In the f…
Optical and infrared absorption spectra of undoped ternary silicate and CoO doped glasses were measured before and after successive gamma ray irradiation. The results obtained revealed the existence of cobalt ions mainly in tetrahedral coordination in such host glasses. The radiation-induced defects created by gamma i…
Abstract The evolution was studied of structural order/disorder phenomena across the wide stability field of the decagonal phase in the system Al—Co—Ni. Full single-crystal X-ray diffraction data sets were collected of 31 samples annealed at 900 °C. Based on reciprocal space reconstructions of the imaging-plate-scanne…
The influence of microstructure and strain rate on the mechanical behaviour of three titanium alloys having applications in aerospace, namely, commercially pure titanium (α phase), Ti–6Al–4V (α + β phases) and Ti– 15V–3Cr–3Sn–3Al (β phase) is investigated for both the parent metals and their gas tungsten arc weldments…
Dendrimers up to three generations, possessing internal PEG units within the branching framework, were synthesized by a convergent approach via the reaction of amine-based dendrons 6, 9, and 11 with 6,6-bis(4-chlorocarbonyl-2-oxabutyl)-4,8-dioxaundecane-1,11-dicarbonyl chloride. These new constructs were fully charact…
Ionic conductivities in the bismuth germanate silicate (BGSO) glasses have been investigated in the frequency range 100 Hz to 15 MHz and in the temperature range from 300 K to above the glass transition temperature T g . The frequency-dependent electrical data have been discussed in the framework of the complex impeda…