Materials Literature
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A submicron, spatially periodic, structure consisting of a sequence of oriented layers of a nematic liquid crystal (NLC), separated by isotropic polymeric walls, was obtained experimentally. This was accomplished by polymerization induced by the interference pattern of UV laser radiation in a NLC-containing prepolymer…
The behavior of three different paint systems was investigated using the electrochemical impedance spectroscopy (EIS) technique. The coatings, based on chlorinated rubber, alkyd resin, and waterborne acrylic resin, were applied on galvanized steel and exposed in a salt spray fog chamber (SSFC) according to ASTM B117.…
Coarsening of solutions of the integro-differential equation formula here where Ω ⊂ ℝ n , J (·) [ges ] 0, ε > 0 and f ( u ) = u 3 − u (or similar bistable nonlinear term), is examined, and compared with results for the Allen–Cahn partial differential equation. Both equations are used as models of solid phase transi…
SrFe 1− x Co x O 3−δ ( x = 0, 0.33) ceramics have been prepared in the temperature interval 900–1350°C in air, nitrogen, and oxygen atmosphere. The effect of cation nonstoichiometry on densification behavior, microstructure, and phase composition has been investigated. Densification of Sr‐deficient SrFeO 3−δ initiates…
We study the molecular mode-coupling theory for a liquid of diatomic molecules. The equations for the critical tensorial nonergodicity parameters F(m)(ll('))(q) and the critical amplitudes of the beta relaxation H(m)(ll('))(q) are solved up to a cutoff l(co)=2 without any further approximations. Here l,m are indices o…
The UV and V spectral features of an AB diblock copolymer composed of polystyrene and a poly(1,2 & 3,4)isoprene-based polymer with a pendant liquid crystalline 4-cyanophenylazobenzene (Az) group in comparison with those of a corresponding LC polyisoprene homopolymer are reported. The orientational and photochromic beh…
The deuteration of synthetic calcium hydroxyapatite (CaHap) and the effect of fluoridation on the deuteration were investigated by in situ Fourier transform infrared spectroscopy to elucidate the surface structure of CaHap particles. The deuteration of column OH - ions of CaHap was reduced by the fluoridation, indicat…
The microstructure of Cu-11 wt% Sn bronze has a marked effect on the distribution of corrosion. Heterogeneous bronze exhibited a greater degree of selective attack in seawater than what occurred on homogeneous alloys. Microprobe analysis and x-ray photoelectron spectroscopy studies showed that copper-rich areas dissol…
The mesomorphic properties of 27 homologues of the N-alkylpyridinium alkylsulphate series were studied by X-ray diffraction and dilatometry. All of these compounds exhibit single smectic A phases whose layer spacings are between 0.64 and 0.8 times the molecular length. Polarizing optical microscopy observation shows t…
A new, essentially composition-independent structural model is proposed for the perovskite-related compound series La n Ti n-δ O 3n , with δ ≤ n/4, based on superspace formalism. In the standard 3-dimensional crystallographic approach, one must specify space group and cell parameters separately for each composition. I…
In ferromagnets with a non-uniform magnetocrystalline and/or magnetoelastic anisotropy, such as nanocrystalline or cold-worked polycrystalline materials, the static magnetic microstructure gives rise to elastic magnetic small-angle neutron scattering (SANS). The paper explores a method for determining the exchange-sti…
The crystallization of glycine and l -phenylalanine from water−isooctane microemulsions stabilized by AOT (sodium di-2-ethylhexyl sulfosuccinate) has been investigated. Crystallization phenomena were strongly affected by the localization of the solubilized molecules within the microemulsion droplets. In the case of gl…
<abstract language="eng">Adsorption of cationic dyes on clays can be used as a model for the interactions between organic compounds and these minerals. Cationic dyes like methylene blue are used to study these interactions because of the spectroscopic changes observed when their molecules are adsorbed on clay su…
Abstract Molecular dynamics simulations were performed of the adsorption of methylene blue (MB) on model beidellite, montmorillonite, and muscovite mica surfaces, using a previously determined empirical force field developed for dioctahedral clays. The simulations show that the adsorption of MB on mineral surfaces can…
Abstract The clay mineralogy of Upper Permian–Lower Cretaceous mudstones from East Greenland has been investigated by X-ray diffraction (XRD), atomic force microscopy (AFM) and thermal analysis in order to evaluate long-term trends in provenance and palaeoclimate and to detect possible volcanic events. The Upper Permi…
Abstract Mesoporous TiO2 with well-defined spherical morphologies has been synthesized under quiescent condition via the template-assisted slow hydrolysis of titanium alkoxide in environmental humidity.
Liquid crystal alignment layers of a high T g polymer containing an azobenzene moiety are prepared by photofabrication of a surface relief grating (SRG). The interference pattern of a circular and linearly polarized Ar+ laser beam generated the surface relief grating and the morphology was detected by atomic force mic…
The effects of heating rate on the sintering behavior and the dielectric properties of Ba 0.7 Sr 0.3 TiO 3 ceramics prepared by boron‐containing liquid‐phase sintering were investigated. When 0.5 wt% B 2 O 3 was added to Ba 0.7 Sr 0.3 TiO 3 , sintering was achieved at ∼1150°C, and the overdoped B 2 O 3 did not form an…
This paper describes the chemical, thermal and thermomechanical characterization of curaua fiber. The research of the thermal and thermomechanical properties of natural fibers is of major interest, considering their increasing utilization in several applications, and the large temperature range to which the fibers are…
The inhibition of protein adsorption to the surfaces of biomedical devices is a crucial requirement for avoiding implant-associated infections or thrombus formation on blood-contacting artificial surfaces and thus for increasing the long-term biocompatibility of the devices. Here, the use of surface plasmon resonance…