Materials Literature
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Using neutron and light scattering techniques, we studied, as a function of swelling degree in a good solvent, the fluctuations of polymer concentration in highly cross-linked gels prepared in the bulk. Using the method proposed by Pusey and Van Megen, we separated the total scattering intensity into the contributions…
Abstract Several iron(III) complexes with the different hexadentate Schiff-base ligands of N4O2 donor sets were synthesized; these are 1 : 2 condensation products of linear tetramines (3,3,3-, 3,2,3-, 2,3,2- or 2,2,2-tetramine) and salicylaldehyde, acetophenone or benzophenone derivatives. Their crystal structures, Mö…
In this paper we report on dynamic wetting studies on model rough surfaces. A series of well-defined model surfaces has been manufactured, and the dynamic wetting of silicone oil droplets on these surfaces has been studied. The surface structures are etched, parallel, V-shaped grooves with varying width and spacing. S…
The synthesis of the highly strained tris(α,α-bis(pentachlorophenyl)-2,4,5,6-tetrachlorotolyl)methane ( 8 ), which is the precursor of the first generation of the polyradical series III, has been achieved by exhaustive chlorination of compound 11 . Stepwise divergent synthesis, by successive Friedel−Crafts reactions,…
For an anisotropic Euclidean ${\ensuremath{\varphi}}^{4}$ theory with two interactions $[u({\ensuremath{\sum}}_{i=1}^{M}{\ensuremath{\varphi}}_{i}^{2}{)}^{2}+v{\ensuremath{\sum}}_{i=1}^{M}{\ensuremath{\varphi}}_{i}^{4}]$ the $\ensuremath{\beta}$ functions are calculated from five-loop perturbation expansions in $d=4\e…
Other| December 01, 1997 Comparison of the crystal chemistry of selected MSi 6 O 15 -based silicates S. M. Haile; S. M. Haile California Institute of Technology, Materials Science Department, Pasadena, CA, United States Search for other works by this author on: GSW Google Scholar B. J. Wuensch B. J. Wuensch Massachuse…
Uniformly ground Sm 2 Fe 17 N x fine powders with high-performance permanent magnetic property and oxidation resistance characteristics were obtained from the coarse powders by ball milling in an organic solution containing a surfactant and surface modification for them, followed by fabrication of their bonded magnets…
Thermal phase stability of graphitelike BC 4 N (g‐BC 4 N) has been studied up to 7 GPa and 2100 K using in‐situ powder diffraction of synchrotron radiation. It has been shown that the process of g‐BC 4 N decomposition at ambient pressure starts at 2050 K and occurs to form highly ordered hexagonal graphitelike boron n…
The reaction of ((tetraphenylporphyrinyl)methyl)triphenylphosphonium chloride and benzaldehydes (CHO−C 6 H 4 −R; R = H, NO 2, NMe 2, OMe, Me, CHO) yields the styryl porphyrin derivatives. These new styryl-substituted porphyrins have been studied using electrochemistry, electronic absorbance, and resonance Raman spectr…
Superconducting phase formation in Bi(Pb)-Sr-Ca-Cu-O glasses -a review, W.W. Ng and S.W. Freiman important aspects of the melt related to processing Bi2Sr2CaCu2Ox conductors, E.E. Hellstrom and W. Zhang thermal stability, properties and crystallization mechanism of Bi-based precursor glasses, T. Komatsu and J. Khaled…
A self-consistent set of thermochemical parameters for about 100 molecules in the Si−B−H−Cl system is obtained using a combination of ab initio electronic structure calculations and empirical corrections (the BAC-MP4 method). The species include stable and radical species as well as a few transition states. Trends in…
It is known that the zero-order two-phase-level gratings with a period much smaller and a thickness much larger than the wavelength may have antireflection properties the same as appropriate dielectric layers under normal incidence. On the basis of the rigorous coupled-wave analysis method formulation, it is shown tha…
Other| December 01, 1997 Si-Al ordering in leucite group minerals and ion-exchanged analogues; an MAS NMR study Simon C. Kohn; Simon C. Kohn University of Warwick, Department of Physics, Coventry, United Kingdom Search for other works by this author on: GSW Google Scholar C. Michael Henderson; C. Michael Henderson Sea…
A method to predict the load-extension behavior of woven fabrics is proposed. Kawabata et al.'s finite deformation theory, which predicts load-extension properties of plain weave and 2/2 twill fabrics in terms of fabric construction parameters and yarn tensile properties, is the basis for the study. The model is gener…
Anodic coupling of tetrabutylammonium 4-(4 H -cyclopentadithien-4-yl)butanesulfonate in acetonitrile + 0.1 M Bu 4 NClO 4 produces self-doped polythiophene films with high conjugation length (λ max = 540 nm; E ° = −0.3 V vs Ag/Ag + ), conductivity (0.6 S cm - 1 ) and solubility in water (ca. 10 g L - 1 ). Electrochemic…
We report the development of a new aspect of the Monte Carlo method for crystal structure solution from powder diffraction data and demonstrate the advantages of this new approach by applying it to solve the low-temperature crystal structure (phase II) of perdeuterated pyrene from neutron powder diffraction data. In p…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCoordination Structure of Zinc(II) Ions on a Langmuir Monolayer, Observed by Total-Reflection X-ray Absorption Fine StructureIwao Watanabe, Hajime Tanida, and Sigehiro KawauchiView Author Information Department of Chemistry, Graduate School of Science Osaka University,…
Light scattering and viscosity measurements were made on anionically polymerized four-arm star polystyrene samples with weight-average molecular weights M w of 8.5 × 10 4 to 3.1 × 10 6 in cyclohexane at different temperatures to determine the mean-square radius of gyration 〈 S 2 〉, the second and third virial coeffici…
A compact 60 kV Mott polarimeter has been constructed, tested, and calibrated especially for the local analysis of surface and two-dimension magnetism by means of electron spectroscopy with spin resolution. The use of construction combining spherical accelerating field with the absence of retarding potential after ele…
The electron density distribution in lithium triborate LiB 3 O 5 has been studied at room temperature by X-ray diffraction using Ag K \alpha radiation up to 1.02 Å −1 [1439 unique reflections with I > 3\sigma( I )]. Conventional refinements with a free-atom model yield R ( F ) = 0.0223, wR ( F ) = 0.0299, S = 1.632…