Materials Literature
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Abstract In basic solutions, the oxidised porphyrin 2 readily undergoes macrocyclic N ‐alkylation, with up to four bulky alkyl groups, including decyl and substituted benzyl moieties, being accomodated: an argument is presented to show that N ‐di‐alkylation occurs on opposite nitrogen atoms, on the same side of the ma…
Substitution of a NO + C3H8+ He flow by O2+ He at 623 K leads to the appearance on a H–Cu–ZSM-5 catalyst of three IR bands at 3366, 3290 and 3192 cm–1 assigned to NH3 species as confirmed by NH3 adsorption showing that ammonia is formed during the SCR of NO by propane in excess oxygen, suggesting that it could play th…
Mixtures of SiC powder with diamond seeds were subjected to hydrothermal treatment at 700–750 °C under pressures of 100–500 MPa. The results of this study demonstrate that well crystallised diamond is formed after hydrothermal treatment of SiC when diamond seeds are present.
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation H. Gramespacher, J. Meissner; Reversal of recovery direction during creep recovery of polymer ble…
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.