Materials Literature
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Abstract Dissolution and mutual diffusion of poly( N ‐vinylpyrrolidone) (PVP) in short‐chain poly(ethylene glycol) PEG400 were studied by wedge microinterferometry over the temperature range of 40–100°C. Successive photographs of interference patterns measured at λ = 546 nm with an optical microscope at 130× magnifica…
Rhodium acetonitrile complexes have been immobilised in the mesoporous silica MCM-41 by pore volume impregnation of a solution of the compound [Rh2(CH3CN)10](BF4)4 in acetonitrile. Powder XRD and N2 adsorption–desorption analysis of the derivatised material confirmed that the textural properties of the hexagonally ord…
We observed interesting structures during phase transformations of lysozyme solutions. The process begins with the separation of a protein-rich liquid phase in the form of droplets. The droplets fall to the bottom of the chamber in a few minutes, and on the scale of an hour they begin to merge, forming an interconnect…
Abstract Investigations into the processing characteristics and physicomechanical properties of natural rubber (NR) modified with liquid natural rubber (LNR) were carried out. Liquid natural rubber samples (of different molecular weights) were first produced by depolymerization of natural rubber latex (NRL), using nit…
The Mn-site-projected electronic structure of the diluted magnetic semiconductors ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ $(x=0.032,$ 0.038, 0.047, 0.052, 0.058) of as-grown and low-temperature (LT) annealed samples are systematically studied using high-resolution Mn $2p$ absorption spectroscopy…
This paper reports the orientational behavior of lyotropic liquid crystals (LCs) formed from 29.4 wt % potassium laurate and 6.6 wt % decanol (remainder water) that are supported on gold films possessing an anisotropic nanometer-scale topography (wavelength ∼10 nm, amplitude ∼2 nm). The gold-coated surfaces are decora…
Alkanes exhibit intermediate plastic–crystalline rotator phases between the liquid and the low-temperature fully ordered crystal. Here we report measurements of the liquid-to-rotator and rotator-to-crystal homogeneous nucleation kinetics using x-ray scattering on emulsified samples. These are the first reported studie…
Abstract Soluble copolysulfoneimides were synthesized by thermal two‐step method in solution of N ‐methyl‐2‐pyrrolidone. The used aromatic diamines were bis[4‐(3‐aminophenoxy)phenyl]sulfone (BAPS‐m) and 3,3′‐diaminosulfone, and dianhydrides were pyromellitic dianhydride, 4,4′‐oxyphthalic anhydride, and 3,3′,4,4′‐diphe…
Composite structures made of structural steel and concrete maximize the advantages of the two components. Using high-performance materials composite construction is becoming more popular. The European Coal and Steel Community has therefore supported the research project `Use of High Strength Steel S460' (1). Within th…
Abstract Tetrafluoroethylene–perfluoroalkyl vinylether copolymer (PFA) sheet surfaces were modified with argon, helium, oxygen, and hydrogen plasmas. How the four plasmas modified the PFA sheet surfaces was investigated. All plasmas modified the PFA surfaces and at the same time initiated degradation of the PFA polyme…
We present a density-functional approach to describe the orientational ordering of nonpolar and dipolar Gay–Berne fluids. The first-order perturbation theory developed by Velasco et al. [J. Chem. Phys. 102, 8107 (1995)] for a Gay–Berne fluid is simplified and tested for molecules with a length to breath ratio of κ=3 a…
A mesostructured transparent thin film containing europium complexes was prepared and investigated. The mesostructure of the film was confirmed by XRD and the luminescence spectra reveal that Eu3+ has a similar environment in both amorphous and mesostructured films.
Abstract The miscibility and mechanical properties of the blends of polybutylene terephthalate (PBT) and polypropylene (PP) with a liquid crystalline ionomer (LCI) containing a sulfonate group on the terminal unit as a compatibilizer were assessed. SEM and optical microscopy (POM) were used to examine the morphology o…
Copolymers of (R)-3-hydroxybutyric acid (HB) and epsilon-caprolactone (CL) with a composition ranging from 28 to 81 mol % of HB were synthesized by transesterification of the corresponding homopolymers in solution in the presence of 4-toluenesulfonic acid. The copolyesters were characterized with regard to their molec…
Ab initio molecular dynamics simulations have been used to study the subpicosecond chemistry and dynamics of hyperthermal O(3P) collisions with single-walled carbon nanotubes, with a particular focus on insertion and substitutional doping. The barrier for inserting an O(3P) atom through the center of a hexagonal carbo…
Self-consistent periodic slab calculations based on gradient-corrected density-functional theory (DFT-GGA) were conducted to probe the potential-energy diagram for the hydrogenation of propanal and acetone on Pt(111). Calculations for molecularly adsorbed species indicate that acetone and propanal are both weakly boun…
Abstract Changes of the composition and structure of various samples of polymethylsilsesquioxane (PMSQ), pyrolyzed at different temperatures under flowing nitrogen, were investigated using thermogravimetric analysis, Raman and Fourier transform infrared spectroscopies, X‐ray photoelectron spectroscopy, elemental analy…
A photobleaching technique has been used to study the segmental dynamics of a polystyrene melt during isothermal physical aging. Both rotational and translational diffusion measurements of dilute tetracene probes dispersed in the polymer matrix were performed. Following a temperature quench from Tg+2 °C into the glass…
Heat treatment of mesoporous carbons obtained by colloidal imprinting of mesophase pitch particles was used to prepare graphitized carbons with uniform mesopores and high surface area.
Raman spectra and x-ray diffraction patterns of ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{1.5}{\mathrm{MnO}}_{4}$ and ${\mathrm{Sr}}_{2}{\mathrm{MnO}}_{4}$ layered manganites have been collected over a wide pressure range (0--20 GPa) using a diamond anvil cell. The pressure dependence of both phonon peaks and lattice paramet…