Materials Literature
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The synthesis of solid-state materials generally requires high temperatures and long reaction times in order to overcome diffusion barriers and achieve homogeneous products. Recently chemical routes using reactive precursors have allowed for greater control over product characteristics including stoichiometry and crys…
The deterioration of the mechanical properties of composite resins was examined. The bending strength and the stress relaxation rate for sixteen experimental composite resins with different filler shapes, particle sizes and filler contents immersed in distilled water for 0-60 days were measured. The bending strength o…
This paper describes the image analysis techniques used for measuring structural characteristics of fiber or fiber bundle segments in a thin nonwoven fabric. The mea surable characteristics include length, thickness, curl, and orientation of fiber segments. A new skeletonization algorithm for extracting the simplified…
Cubic Boron Nitride (c-BN) single-crystals have been synthesized under high pressure and high temperature conditions (HP - HT) using hexagonal Boron Nitride (h-BN) precursors. We have performed a study of both phases with electron (EELS) and X-ray (XAS) spectroscopy that are compared. The c-BN ELNES spectra at B-K and…
The adsorption and reaction of formic acid (HCO2H) on the NiO(111)/Mo(110) and MgO(111)/Mo(110) surfaces have been studied using temperature-programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). The adsorption of formic acid on the NiO(111) surface is dissociative even at 100 K, i…
COF groups are formed by electron irradiation of PTFE [poly(tetrafluoroethylene)] powders in air, especially at the surface and in near-surface regions which can be easily hydrolysed to carboxyl groups by air humidity. The application of special additives during irradiation leads to modified micropowders. Fourier tran…
The development of a user-friendly, interactive personal computer package for designing insulators to be used in polluted conditions is presented. This is accomplished by integrating a dynamic arc model that computes the pollution flashover voltage within the Microsoft Windows application program. Suspension, station…
Glucose is released from the diboronic acid ‘clef’3 when a metal ‘sandwich’ is formed by two 15-crown-5 rings; the binding events are sensitively monitored by changes in the fluorescence intensity.
Several homologues of two structurally different types of mesogenic difluoroterphenyls have been prepared. One set of compounds contains two inner-core fluoro-substituents and the other set possesses both an inner-core and an outer-core fluoro-substituent. The use of various types of palladium-catalysed cross-coupling…
Arg-Gly-Asp peptides (RGD) were synthesized and chemically coupled to the bulk of N-(2-hydroxypropyl) methacrylamide-based polymer hydrogels. Fourier Transform Infrared Spectroscopy (FTIR) and amino acid analysis confirmed the peptide coupling to the polymer. Activated and control (unmodified) polymer matrices were st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and Spectroscopic Properties of Antiferromagnetically Coupled FeIIIMnII and FeIIMnII ComplexesTheodore R. Holman, Zhigang Wang, Michael P. Hendrich, and Lawrence QueCite this: Inorg. Chem. 1995, 34, 1, 134–139Publication Date (Print):January 1, 1995Publication His…
Arylalkanes are oxidized by dithiocyanato- and dibromo-[4,4′-di(tert-butyl)-2,2′-bipyridyl]molybdenum(VI) dioxo complexes either thermally or under UV irradiation.
Small-angle X-ray scattering (SAXS) together with nitrogen adsorption, have been employed to analyse the pore-structure evolution behaviour, on the nanometre scale, by varying solvent-exchange treatment for silica gels having bicontinuous interconnected macropores. For the gels prepared in the system containing poly(a…
Ab initio quantum chemical calculations on short-chain model compounds have been used to study the conformation, valence electron density, and chain flexibility of halogen-substituted poly-(thionylphosphazenes) (PTPs) [(NSOX)(NPCl&], (X = F or Cl), which are representatives of a new class of inorganic sulfur(vI)-n…
Approximate density functional theory calculations have been used to investigate the trans influence in five- and six-co-ordinate transition-metal nitride complexes. The geometries of [OsNX4]–(X = Cl, Me or SMe) and [OsNCl5]2– were optimized in the C4v point group. The agreement between calculated and experimental geo…
Nickel(II) ions template the formation of the first macrocycle to incorporate both phenol and thiophenol head units; the structure of [Ni2L(MeCN)2][ClO4]21, with adjacent square-planar and octahedral nickel(II) ions, is described.
Journal Article SYMMETRIC GROUP BLOCKS OF DEFECT TWO Get access JOANNA SCOPES JOANNA SCOPES 117 Limes Road Hardwick Cambridge CB37XU Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Mathematics, Volume 46, Issue 2, June 1995, Pages 201–234, https://doi.org/10.1093/qmath…
29 Si NMR experiments on C-S-H formed during the two kinetic steps of C 3 S hydration reveal the presence of Q 1 and Q 2 signals. For a very low percentage of the reaction, a Q 0 signal is also observed. However, this signal is not believed to be induced by C-S-H and has been attributed to C 3 S,h (C 3 S superficially…
Sintering behavior of SiC with oxide additives is controlled by SiO2 content and particle size of starting powders at temperatures below 1900°C and chemical reactions, which evolve gaseous products (possibly SiO, Al2O, CO), between SiC, free carbon, SiO2 on SiC and oxide additives at temperatures above 1900°C.The high…
The binary system PbO–BiVO4 exhibits two new phases, Pb4BiVO8 and Pb2BiVO6. They both melt congruently at 780 °C. They have been identified by single-crystal and powder X-ray diffraction. Pb4BiVO8 crystallizes with a triclinic cell, a= 6.221(2)Å, b= 7.603(5)Å, c= 10.457(4)Å, α= 100.40(3)°, β= 102.18(2)°, γ= 90.03(3)°…