Materials Literature
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Recombinant 1-deoxy-D-xylulose 5-phosphate synthase of Bacillus subtilis was used for the preparation of isotope-labeled 1-deoxy-D-xylulose 5-phosphate using isotope-labeled glucose and/or isotope-labeled pyruvate as starting materials. The simple one-pot methods described afford almost every conceivable isotopomer of…
Five new rare-earth metal polyselenophosphates have been synthesized by the reactive flux method and characterized by single-crystal X-ray diffraction: K(2)La(P(2)Se(6))(1/2)(PSe(4)) (I), K(3)La(PSe(4))(2) (II), K(4)La(0.67)(PSe(4))(2) (III), K(9-x)()La(1+)(x/3)(PSe(4))(4) (x = 0.5) (IV), and KEuPSe(4) (V). Compound I…
Raman scattering experiments from silver nanocrystals embedded in films of amorphous silica are reported. In addition to the low-frequency peak due to vibrational quadrupolar modes, a broadband is observed in the high-frequency range, with a maximum at about 1000 ${\mathrm{cm}}^{\ensuremath{-}1}.$ The linear dependenc…
Abstract Raman spectral shifts of single‐wall carbon nanotubes embedded in polymer systems were used to measure transitions in polymers. Glass‐transition temperatures and secondary transitions were observed, and Raman spectroscopic data were compared with dynamic mechanical tests for a thermosetting and a thermoplasti…
Within the Onsager theory we study the planar isotropic-nematic interface of fluids of hard rods. We present a method with which interfacial biaxiality can be dealt with efficiently and systematically, and apply it (i) to the pure hard-rod fluid and (ii) to a binary mixture of thin and thick hard rods. In the one-comp…
Approaches to controlling NO x emission have been investigated worldwide. Numerical simulation models describing gas−particle flow, heat transfer, and combustion processes are presented in this paper to provide reasonably accurate predictions of the flow field, temperature field, and the distribution of chemical speci…
It is shown that a fluid near a topographically patterned wall exhibits crystallization below the bulk freezing point (so-called precrystallization). In detail, a periodic array of fixed hard spheres is considered as a wall pattern. The actual type of the pattern corresponds to a face-centred-cubic (fcc) lattice cut a…
Detailed spectroscopic studies of the interaction of carbon monoxide (CO) with the (100) surfaces of titanium carbide (TiC) and vanadium carbide (VC) have been performed for the first time and analyzed to provide insight into the nature of the surface chemical interactions. The carbide materials are technologically im…
The structure of a fluid of hard Gaussian overlap particles of elongation κ = 5, confined between two hard walls, has been calculated from density-functional theory and Monte Carlo simulations. By using the exact expression for the excluded volume kernel (Velasco E and Mederos L 1998 J. Chem. Phys. 109 2361) and solvi…
We propose here a simple technique for the assembly of oxidatively shortened single-walled carbon nanotubes (SWNTs) on silver surface. This technique is based on the spontaneous adsorption (self-assembly) of the −COOH groups at the open ends of carbon nanotubes onto silver surface. Raman spectroscopy, tapping mode ato…
In ferromagnets with a nonuniform magnetocrystalline and/or magnetoelastic anisotropy, such as nanocrystalline (nc-) or cold-worked (cw-) polycrystalline materials, the static magnetic microstructure gives rise to strong elastic magnetic small-angle neutron scattering (SANS). The paper explores a method for analyzing…
The perturbed angular correlation (PAC) technique was used to study the hyperfine interactions in the antiferromagnetic and paramagnetic regions of the distorted perovskites ${\mathrm{LaCrO}}_{3}$ and ${\mathrm{LaFeO}}_{3}.$ The dilute ${}^{111}{\stackrel{\ensuremath{\rightarrow}}{\mathrm{In}}}^{111}\mathrm{Cd}$ nucle…
Here we consider how phase-separation kinetics and morphology are affected by the preferential wetting of a solid surface by one component of a binary fluid mixture. The behaviour is crucially dependent upon whether the spinodal decomposition is bicontinuous-type or droplet-type, i.e. the composition symmetry. Near a…
The surface structure of anatase ${\mathrm{TiO}}_{2}(001)$ was investigated using scanning tunneling microscopy (STM), x-ray photoelectron spectroscopy (XPS), reflection high-energy electron diffraction (RHEED), and low-energy electron diffraction (LEED). A two-domain $(1\ifmmode\times\else\texttimes\fi{}4)/(4\ifmmode…
Photoinduced orientational behavior of a polymethacrylate (CN6) and a polyester (p6a12) with p -cyanoazobenzene side chains was studied to reveal the structural effect of the liquid crystalline polymer backbones. Irradiation with linearly polarized UV light resulted in the reorientation of the azobenzene for both poly…
The first direct evidence for second-order nonlinearity in partially cross-linked polyacrylonitrile is reported. The cross-linking in γ-ray-induced polymerized neat acrylonitrile is well supported by UV−vis spectroscopy, FTIR, and 13 C CP/MAS solid-state NMR. The second harmonic generation (SHG) powder test was employ…
Six new actinide metal thiophosphates have been synthesized by the reactive flux method and characterized by single-crystal X-ray diffraction: Cs(8)U(5)(P(3)S(10))(2)(PS(4))(6) (I), K(10)Th(3)(P(2)S(7))(4)(PS(4))(2) (II), K(5)U(PS(4))(3) (III), K(5)Th(PS(4))(3) (IV), Rb(5)Th(PS(4))(3) (V), and Cs(5)Th(PS(4))(3) (VI).…
A theoretical model of the effect of inhomogeneous broadening on the luminescence lineshape of ${\mathrm{Cr}}^{3+}$ is developed and applied to the disordered system ${\mathrm{Cr}}^{3+}:{\mathrm{LiTaO}}_{3}.$ At ambient pressure, ${\mathrm{Cr}}^{3+}$ occupies primarily low-field sites in ${\mathrm{LiTaO}}_{3}$ and exh…
We address the problem of the interpretation of heavy nucleus spin-spin couplings for systems being studied in solution. Solvation can create counterintuitive features concerning the spin-spin couplings, which are enhanced by relativistic effects due to the presence of heavy nuclei. This should therefore be taken into…
Polystyrene and poly(methyl methacrylate) copolymers with cyclophosphazene side groups have been prepared by the reactions of azidocyclophosphazenes with diphenylstyrylphosphine residues in the copolymer structures. The cyclophosphazene pendent groups were present in from 1 to 100% of the monomer residues in polystyre…