Materials Literature
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To add stable antimicrobial properties to woods, an amphoteric sterilant, 3-(trimethoxysilyl))propyl (carboxymethyl) decylmethyl ammonium hydroxide inner salt (TMSAH) was applied to the sol-gel process, as SiO 2 wood-inorganic composites were prepared. The obtained TMSAH-added SiO 2 composites could reveal the high an…
Hexagonal mesoporous silica-supported molybdenum oxide exhibits much higher catalytic activity for the metathesis of oct-1-ene in the liquid phase, compared with MoO3 on normal porous silica and MoO3 on γ-alumina.
Thermogravimetric and differential thermal analyses of mesoporous zirconias obtained from anionic surfactants by a scaffolding mechanism reveal interesting differences between the samples prepared from long-chain sulfates or sulfonates, which lose their hydration water in two steps, and those obtained from long-chain…
The synthesis and characterization of a novel inorganic/organic hybrid material is described; the 3-D framework consists of InO6 octahedra which are linked by inorganic phosphate and organic oxalate anions to generate intersecting tunnels in which piperazinium cations and water molecules reside.
The accumulation of space charge in XLPE (cross-linked polyethylene), cross-linked using DCP (dicumyl peroxide) or a silane-based grafting process, was studied via the LIPP (laser-induced-pressure-pulse) technique. Planar samples 0.5 mm thick were obtained from the XLPE insulation of power distribution cables. DC fiel…
MnIII ions that replace a few percent of the framework AlIII sites in a microporous aluminophosphate—number 18, with a pore aperture of 3.8 Å—function as catalytically active centres for the selective oxidation of dodecane preferentially at C1 and C2.
The deformation behaviour of rubber toughened poly(methyl methacrylate) (PMMA) was studied using real time small angle X-ray scattering (SAXS) with a synchrotron radiation source. The invariant analysis method was used to analyze the influence of rubber particle concentration and rubber cross-linking density on craze…
The molecular structure and conformational behaviour of 2,2′-bipyrrole (α-BPy), 2,2′:5′,2″-terpyrrole (α-TPy) and 2,2′:5′,2″:5″,2‴-quaterpyrrole (α-QPy) have been determined by abinitio HF, MP2 and density functional theory methods, using the 6-31G* basis set. The syn↔anti interconversion process through internal rota…
DFT-B3LYP calculations are performed on 4-ring models of aluminophosphates (AlPOs) and silico-aluminophosphates (SAPOs). The results are used to fit the parameters of ion pair shell model potential functions. The potentials obtained are tested in lattice energy minimizations for berlinite and the microporous materials…
Crystalline structures and surface morphologies of annealed RuO 2 and Ru thin films were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The annealing was performed in oxygen and argon ambient and high vacuum in the temperature range of 400–800° C. In oxygen ambient annealing, the su…
In vitro corrosion resistance and ion dissolution of commercial pure titanium with different surface microroughness are studied adopting constant potential meter and atomic absorption spectroscopy. In terms of the surface roughness, titanium samples are divided into 5 groups: smooth surface, machining surface, 2 diffe…
The biological attack of microorganisms on rubber materials was investigated in order to evaluate possible contributions of biotechnology for refinement and recycling of used rubber products. Adaptation of microbial enrichment cultures with tire crumb material for several months resulted in enhanced growth of microorg…
This review summarizes research on treeing phenomena, i.e. the formation of electrical trees and water trees, that has been undertaken in Japan for the development of 500 kV XLPE cable. Section 1 presents the results of factors affecting XLPE cable insulation breakdown under commercial ac and lightning impulse voltage…
The absorption and permeation of H into transition metals under conditions of cathodic polarization or wet corrosion is commonly enhanced by adsorbed catalyst poisons which, however, decrease the coverage by adsorbed H, the intermediate in the hydrogen evolution reaction. This unexpected direction of behaviour has rem…
The copper(I)-templated synthesis of the first [2]catenate incorporating electron-donor and -acceptor porphyrins linked mechanically, though not covalently, has been achieved, along with that of related model compounds incorporating only electron donating zinc(II) porphyrins. The preparations were approached by first…
The XPS spectra of aluminum phosphate were collected with a VSW HA150 using monochromatic Al Kα x-radiation. Monochromatic radiation provides a distinct clarity to the rich peak structure in the valence band of aluminum phosphate due to the absence of interfering x-ray satellites from the intense O 2s region. The vale…
X-ray photoelectron spectra were measured on the fresh surfaces of silica, binary alkali silicate and mixed alkali silicate glasses fractured in ultra-high vacuum by irradiating with focusing monochromatic AlKα X-ray. Binding energies and chemical shifts of O1s, Si2p, Li1s, Na1s, K2p, Rb3d5/2 and Cs4d5/2 have been inv…
A general approach for the rational synthesis of linear trinuclear complexes containing three different metals MAMBMC is described and a member of the series, FeIIICuIINiII, has been characterized by X-ray crystallography and magnetic susceptibility measurements.
Porphyrin-core dendrimers consisting of benzyl ether dendrons assembled around a porphyrin core have been prepared by two different convergent syntheses. The first involves the direct condensation of convergent dendrons having 3,5-disubstituted benzaldehyde focal points with an equivalent amount of pyrrole. This route…
meso-η1-Palladio- and platinioporphyrins have been isolated for the first time by means of oxidative addition of bromoporphyrins to Pd(0) and Pt(0) complexes; the X-ray crystal structure of the title complex was determined.