Materials Literature
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A review is presented of the state of the art of conducting polymers. Special attention is given to the high electrical conductivity of highly ordered doped polyacetylene, to the attempts to reproduce σ-values above 10 5 S/cm, and to efforts to correlate the electrical conductivity with other physical parameters (Euro…
The octaamino cryptand, L2, obtained by tetrahydroborate reduction of the [2 + 3] condensation product of tris(2-ethylamino)amine with terephthalaldehyde, acts as a host for pairs of protons or first-series transition-metal cations. An X-ray crystallographic structure determination of [H4L2]4+ reveals a pair of proton…
The distribution of extra-framework cations in zinc/sodium zeolite-Y has been determined by synchrotron X-ray powder diffraction using anomalous scattering methods.
- Particle and Lamella Interaction in Fluid Environments; - Colloidal Particles: Size and Mobility; - Rheology and Stability; - Colloidal Suspensions under Stress; - Surface Properties and Adsorption;
Water-stable, axial dialkoxy hypervalent phosphorus(V)tetraphenylporphyrins have been synthesised in a novel fashion by efficient substitution of axial chloride ligands of dichlorophosphorus(V)-tetraphenylporphyrin.
Book Review| July 01 1992 Fourth Ezra: A Commentary on the Book of Fourth Ezra Fourth Ezra: A Commentary on the Book of Fourth Ezra, Michael Edward Stone. Alden Thompson Alden Thompson Search for other works by this author on: This Site Google Journal of Biblical Literature (1992) 111 (2): 333–335. https://doi.org/10.…
Recent advances in materials technology has led to the development of new and improved optically nonlinear materials that can be used for a wide variety of applications ranging from deep UV conversion for laser fusion experiments to fast optical switching devices in future telecommunication systems. The processibility…
In 1962 Bienenstock and Ewald described a simple and systematic method for computing all the crystallographic space groups in Fourier space. Their approach is reformulated and further simplified, starting from the definition of the point group of a structure as the set of operations that take it into something indisti…
The synthesis of 2-vinyloxyethyl 3,4,5-tris[4-(n-dodecanyloxy)benzyloxy]benzoate (3), its cationic polymerization to poly{2-vinyloxyethyl 3,4,5-tris[4-(n-dodecanyloxy)benzyloxy]benzoate}(4) with relative number-average degrees of polymerization (DP) from 3.7 to 16 and narrow molecular-weight distributions (i.e. Mw/Mn⩽…
We carry out systematic analysis of 4f core photoemission spectra for actinide di-oxides AnO 2 (An = Th ∼ Bk), using the impurity Anderson model including the exchange interaction J between 5f electrons. The effect of J is important in explaining the observed photoemission spectra especially for PuO 2 , AmO 2 and CmO…
The thermal and structural characteristics of a synthetic hydrotalcite-like material are described. Weight losses at 68 and 218 °C are observed, which are attributed to the loss of physisorbed and intercalated water, respectively. The loss of the intercalated water is accompanied by a decrease in the (003) repeat dist…
The microstructure and the Ms temperature were systematically investigated for three types of Ti–Ni–Nb shape memory alloys, Ti50−x⁄2Ni50−x⁄2Nbx, Ti50Ni50−xNbx and Ti50−xNi50Nbx covering a wide composition range, by utilizing optical microscopy, SEM, EPMA, X-ray diffraction and DSC. Consequently, the following results…
A series of H3PW12O40–SiO2 catalysts with various polyanion contents (ranging from 13 to 87 wt%) were studied by 31P MAS NMR spectroscopy; two peaks were detected, one corresponding to the bulk H3PW12O40 and the other to (SiOH2+)(H2PW12O40–).
Abstract Four different silica modifications—thermally grown SiO 2 , quartz glass, silicalite and silica gel—have been investigated by XPS. Binding energies for Si 2p, Si 2s and O 1s were obtained by employing different methods of static charge referencing. In any case, a C 1s references was used as usual. In another…
The diffuse reflectance spectra (UV–VIS) of bulk and silica-supported CeO2(⩽1.10% Ce) are presented. Very small supported cerium oxide particles (10–15 Å) are obtained, which exhibit distinct spectral features assigned to surface cerium oxygen species.
peer reviewed
Mg2Si1−xGex Solid Solution Semiconductors were prepared in the composition range 0.0≤x≤0.4. At a composition x=0.4, effects of impurities were investigated for dopants of Sb and Ag. Carrier concentrations were controlled up to 1.5×1026 electrons/m3 and 5.5×1025 holes/m3 by doping Sb and Ag, respectively. The thermal c…
A review of the corona charging of polymers is presented. After providing a brief account of the corona discharge process and of its application for charging materials, the paper focuses on the evolution of corona triodes that allow the sample surface potential to be monitored during the charging process. Particular e…
Abstract Two series of experiments on well‐characterized systems were performed to examine the probing depth of soft x‐ray absorption spectroscopy (XAS) measured in total‐electron‐yield (TEY) mode. First we measured the Ni 2 p 3/2 absorption spectra of Ni(100) covered with Tb as a function of the overlayer thickness.…
Parameters controlling intrinsic stability and reactivity of organosilanols generated from alkoxysilanes in aqueous environments have been elucidated in several experiments. Data involving kinetics, equilibrium, phase separation, and bonding studies of alkyl and organofunctional alkoxysilanes are presented. The studie…