Materials Literature
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The selenium(IV) diimide AdN=Se=NAd (Ad = 1-adamantyl) adopts a monomeric structure with a Z,E configuration in the solid state whereas the seleninylamine OSe(mu-NBut)2SeO crystallizes as the cis-dimer.
The spin polarization of single crystals ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{0.6}{\mathrm{Sr}}_{0.4}{\mathrm{MnO}}_{3}$ has been measured by point-contact Andreev reflection (PCAR) using a superconducting Pb tip. The conductance vs bias voltage spectra have been taken at temp…
A structural analysis of alkyl chain conformation of an intercalated cationic lipid bilayer is described. Dialkyl dimethylammonium ions ( di -C n DA) were ion exchanged into the galleries of layered cadmium thiophosphate to give Cd 0.83 PS 3 ( di -C n DA) 0.34 . The grafting density and interlayer expansions were iden…
A number of conventions for the parameterization of atomic anisotropic displacements are used in the literature and in crystallographic programs. Here we summarize the commonly used conventions, with a special emphasis on their application in macromolecular crystallography. We then describe a new software toolbox for…
The well-known radical and ion scavenger techniques of application in amorphous hydrogenated carbon film deposition studies are investigated in relation to the mechanism of tritium and deuterium co-deposition in carbon-dominated fusion devices. A particularly successful scheme results from the injection of nitrogen in…
Abstract Lithium chloride was added to systematically alter the phase separation behavior, and hence, the nature of urea phase connectivity, in a series of plaques based on molded flexible polyurethane foam formulations. The plaques prepared were found to possess varied levels of urea phase connectivity that was exami…
A novel sonochemical method was found to prepare amorphous CdSe cluster and hexagonal nanocrystalline CdSe in aqueous solution. An interfacial mechanism for the sonochemical formation of CdSe nanoparticles was confirmed. The exploration for luminescence properties of the as-prepared CdSe nanoparticles revealed its wid…
The x-ray photoelectron spectra (XPS) of copper tetraazaporphyrin (CuTAP), used as a model of copper phthalocyanine(CuPc) are studied by theoretical simulations. The nature of the main and satellite features observed in the XPS Cu $2p$ and Cu $3s$ photoelectron spectra are discussed based on the results of the charge-…
Extended X-ray absorption fine structure (EXAFS) and neutron scattering data from monoclinic zirconia are analysed independently and simultaneously by reverse Monte Carlo (RMC) modelling. X-ray and neutron powder diffraction data are analysed by Rietveld refinement. The results are compared with respect to the local s…
The reactions between triphenylbismuth, salicylic acid, and the metal alkoxides M(OCH(2)CH(3))(5) (M = Nb, Ta) or Ti[OCH(CH(3))(2)](4) have been investigated under different reaction conditions and in different stoichiometries. Six novel heterobimetallic bismuth alkoxy-carboxylate complexes have been synthesized in go…
The surface glass transition temperature, T g, of several amorphous polystyrene (PS) samples each with a narrow molecular weight distribution covering the range of M n from 3 900 to 1 340 000 has been measured by force−distance measurements using a scanning force microscope (SFM). Hysteresis in the loading−unloading c…
The International Union of Crystallography (IUCr) Commission on Powder Diffraction (CPD) has sponsored a round robin on the determination of quantitative phase abundance from diffraction data. The aims of the round robin have been detailed by Madsen et al. [ J. Appl. Cryst. (2001), 34 , 409–426]. In summary, they were…
ADVERTISEMENT RETURN TO ISSUEPREVNoteChemical Modification of Chitosan. 14: 1 Synthesis of Water-Soluble Chitosan Derivatives by Simple AcetylationHitoshi Sashiwa, Norioki Kawasaki, Atsuyoshi Nakayama, Einosuke Muraki, Noboru Yamamoto, and Sei-ichi AibaView Author Information Green Biotechnology Research Group, The Sp…
We investigate different correlation mechanisms for two-electron systems and compare their respective effects on various electron distributions. The simplicity of the wave functions used allows for the derivation of closed-form analytical expressions for all electron distributions. Among other features, it is shown th…
For multi-stage, displacive structural transitions we present a general framework that accounts for various intermediate modulated phases, elastic constant, phonon and related thermodynamic anomalies. Based on the presence or absence of modulated phases we classify these transformations in four categories and apply th…
The combined effect of single-particle and collective surface excitations in the decay of image-potential states on Ag surfaces is investigated, and the origin of the long-standing discrepancy between experimental measurements and previous theoretical predictions for the lifetime of these states is elucidated. Althoug…
The eigenvalue spectra of the transition probability matrix for random walks traversing critically disordered clusters in three different types of percolation problems show that the random walker sees a developing Euclidean signature for short time scales as the local, full-coordination constraint is iteratively appli…
We report on extended investigation of the thermal transport and acoustical properties on hard carbon samples obtained by pressurization of ${\mathrm{C}}_{60}$ fullerene. Structural investigations performed by different techniques on the same samples indicate a very inhomogeneous structure at different scales, based o…
From density-functional-theory (DFT) based methods we calculate the vibrational spectrum of the Mn_{12}O_{12}(COOH)_{16}(H_2 O)_4 molecular magnet. Calculated infrared intensities are in accord with experimental studies. There have been no ab initio attempts at determining which interactions account for the fourth-ord…
A paramagnetic Yb(III) complex bearing six exchangeable amide protons, [Yb(MBDO3AM)](3+), has been investigated with the aim of developing a MRI-CEST (chemical exchange saturation transfer) contrast agent responsive to the concentration of L-lactate. The complex binds the substrate quantitatively to yield [Yb(MBDO3AM)…