Materials Literature
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The Rietveld quantitative phase analysis of polycrystalline mixtures is a model-dependent method. The absence of any structural information about even one phase in the mixture prevents the application of the method; on the other hand, the availability of a structural model that is not sufficiently representative of re…
Abstract Two formulas of grafted polymers with metal‐containing chromophores, potentially suitable for second‐order nonlinear optics applications, are described. Two chromophores were obtained from a tridentate ligand coordinated to Cu(II) or Pd(II) ions. The organometallic chromophore fragments were grafted to poly(4…
A new procedure is described in which kaolin and a small amount of concentrated sulfuric acid are heated in a furnace at temperatures between 150 and 1000 °C. Parameters studied were reaction temperature and time, proton to alumina molar ratio, calcination temperature and time, and amount of water in the reaction medi…
Anomalous small-angle X-ray scattering (ASAXS) experiments with synchrotron radiation were performed to study the three-dimensional nanostructures of metal/organic hybrids formed by crosslinking aluminium-organic-stabilized platinum nanoparticles with various bifunctional organic spacer molecules. The advantage of ASA…
In this paper, the growth stability of open-ended carbon nanotubes mediated by surface diffusion on the lateral surface of the nanotube is considered in detail. Nanotube growth and destabilization is viewed as a competition of two processes at the open growth edge: (i) hexagon formation sustaining the continuous growt…
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…