Materials Literature
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X-ray reflectometry (XRR) is a well established technique to evaluate quantitatively electron density, thickness and roughness of thin layers. In this paper, results of the first world-wide XRR round-robin experiment, involving 20 laboratories, are presented and discussed. The round-robin experiment was performed with…
The sticking probability for hydrogen on films of Co, Ni, Cu, Ru, Rh, Pd, Ir, and Pt supported on graphite has been measured at a hydrogen pressure of 1 bar in the temperature range 40-200 degrees C. The sticking probability is found to increase in the order Ni, Co, Ir, Pd, Pt, Rh, and Ru at temperatures below 150 deg…
A high-pressure cell for synchrotron small-angle X-ray scattering (SAXS) studies of protein solutions is described. The design was optimized for use at up to 400 MPa in liquid pressure and with 8−12 keV X-rays with particular emphasis on the ease of use. The high-pressure cell was fabricated from corrosion-resistant I…
The use of blends in which a mesogen induces mesomorphism into a non-mesogenic compound has made possible the self-organization of phthalocyanine--[60]fullerene (Pc-C60) dyads into liquid crystals. Pc-C60 dyads 1, 2, or 3, in which two photoactive units are brought together by a phenylenevinylene spacer, have been syn…
The structural and optical properties of pure and zinc doped tin oxide (SnO 2 ) thin films have been studied in detail. Thin films of pure and zinc doped tin oxide (Zn : SnO 2 ) were prepared on Si(1 0 0) and quartz substrates by the spray pyrolysis technique at a substrate temperature of 400 °C. The zinc dopant conce…
A simple hydrothermal method has been developed to synthesize monodisperse β-NaLuF 4 microplates in a large scale. The microcrystals have a perfect hexagonal shape with a diameter of about 5.2 µm and a thickness of 300 nm. Trisodium citrate (Cit 3- ), which is introduced into the reaction mixture and acts as the chela…
We have investigated a new type A- b -B/C blend system, poly(vinylphenol- b -methyl methacrylate)/poly(vinylpyrrolidone) (PVPh- b -PMMA)/PVP, where PVPh- b -PMMA block (A- b -B) copolymer, PVPh/PVP (A/C), and PMMA/PVP (B/C) blends are all miscible through hydrogen bond interaction or dipole−dipole interaction. Because…
A novel thermally stable fluorescent molecular switch with [2 + 2] photocycloaddication and cycloreversion and its application in 2D and 3D optical data storage were demonstrated. The reversibility of the photochemical reaction in the solid state was effectively improved by introducing a dipole into the molecular syst…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTGrafting Polyimides from NanodiamondsQingxin Zhang, Kimiyoshi Naito, Yoshihisa Tanaka, and Yutaka KagawaView Author Information Research Center for Advanced Science and Technology (RCAST), the University of Tokyo, 4-6-1, Komaba, Meg…
Spherical nanoporous carbon particles were synthesized from carbon precursor solutions of sucrose with either silica sols or colloidal silica particles, or both, in a direct one-step aerosol-assisted process followed by carbonization and then removal of the silica template. The resulting carbon particles show very hig…
New software tools are introduced to facilitate diffraction experiments involving large numbers of crystals. While existing programs have long provided a framework for lattice indexing, Bragg spot integration, and symmetry determination, these initial data processing steps often require significant manual effort. This…
In switched-mode power supplies - the predominant type of power converter in contemporary electronic equipment - ferrite magnetic components under dc bias conditions are typically large and have relatively high losses. The nature of these losses is not widely understood, and research in this area has been hampered by…
A new family of phosphorus dendrimers containing on their surfaces 3, 6, 12, and 96 15-membered azamacrocycles has been synthesized. The coordinating ability of these macrocycles to palladium(0) atoms allowed the preparation of new dendrimers of several generations containing the corresponding metal complexes and seve…
For the first time, protein microcrystallography has been performed with a focused synchrotron-radiation beam of 1 microm using a goniometer with a sub-micrometre sphere of confusion. The crystal structure of xylanase II has been determined with a flux density of about 3 x 10(10) photons s(-1) microm(-2) at the sample…
Ln 3+ doped (Yb 3+,Tm 3+ codoped and Yb 3+,Er 3+,Tm 3+ tridoped) NaYF 4 /poly(vinyl pyrrolidone)(PVP) ( M w ≈ 1 300 000) composite fibers with an average diameter of 300−800 nm were prepared by electrospinning and characterized by X-ray diffraction, field emission scanning electron micrography, and Fourier transform i…
CoOOH hierarchically hollow spheres consisting of nanorods by self-assembly coupled with bubble templating through a facile one-step hydrothermal route have been demonstrated. An energy-minimizing-driven self-assembly of CoOOH nanorods on the base of O 2 bubbles induced by CTAC is responsible for the formation of hier…
From the Contents: Growth Histories of Mineral Crystals as Seen from their Morphological Features.- Theory of Crystal Growth from Vapor and Solution.- Epitaxal Growth of III-V Compounds.- CVD Diamond Growth.- Laser-Assited Growth and Characterization of Multicomponent Lead-Zirconate-Titanate Films.- Silicon Carbide Cr…
Two-dimensional (2D) zinc oxide (ZnO) nanostructures of thickness 40−100 nm and length up to several micrometers are vertically grown on indium−tin oxide-coated glass substrates by using electrochemical deposition in the temperature range of 22−90 °C. The deposition temperature is found to play a significant role in c…
In many situations, for example, in the cores of a rotating electrical machine and the T-joints of multiphase transformers, the magnetic flux varies with time in terms of both magnitude and direction, i.e., the local flux density vector rotates with varying magnitude and varying speed. Therefore, it is important that…
The effect of solvent molecule on the emission properties of Sm(hfa)3(phen)2 (hfa = hexafluoroacetylacetonato, phen = phenanthoroline) was investigated using acetone, acetonitrile, and pyridine. 5G(5/2) --> 5H(9/2) transition intensities in pyridine were found to be larger than those in corresponding acetone and aceto…