Materials Literature
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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)…
The plasticizing effect of different polyols such as glycerol, xylitol, sorbitol, and maltitol on waxy maize starch was investigated. The concentration of plasticizer was fixed at 33 wt % (dry basis of starch). The structure and mechanical performance of resulting films conditioned at different relative humidity level…
Aggregation of polar merocyanine dyes has been identified as an important problem in the fabrication of organic materials for photonic applications. In this work, a series of merocyanine dyes is synthesized, and their aggregation is investigated by a combination of several experimental techniques to reveal structure-p…
This paper describes a Fortran program, IsGISAXS , for the simulation and analysis of grazing-incidence small-angle X-ray scattering (GISAXS) of islands supported on a substrate. As is usual in small-angle scattering of particles, the scattering cross section is expressed in terms of an island form factor and interfer…
Unique electronic and chemical properties of metal nanoparticles have drawn the attention of chemists, physicists, biologists, and engineers who wish to use them for the development of new generation nanodevices. Metal nanoparticles such as gold and silver show noticeable photoactivity under UV−visible irradiation as…
ADVERTISEMENT RETURN TO ISSUEPREVCommentNEXTKinetics and Mechanism of MoO3 Reduction. Comments on “In Situ XAS and XRD Studies on the Formation of Mo Suboxides during Reduction of MoO3”Jerzy SłoczyńskiView Author Information Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8…
Structural and chemical evolution paths of white K-mica and chlorite from low-temperature metamorphic rocks are studied by X-ray powder diffractometry and electron probe micro-analysis in order to determine the effects of lithology expressed by bulk rock major element chemistry on the phyllosilicate reaction progress.…