Materials Literature
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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.
Ti-beta catalyses the oxidation of small- and medium-sized silanes to the corresponding silanols by aqueous (30%) H2O2 as oxygen donor with high conversions and excellent selectivity (no disiloxane).
Evolutional changes in interior structures of mixed population biofilms grown on domestic wastewater were quantitatively analyzed using a cryosectioning technique and an image analysis. Meanwhile, transport of particulates into the biofilms was also experimentally investigated using fluorescent microbeads as tracers t…
By surveying the most used methods for evaluating the kinetic parameters from nonisothermal experiments, a new classification scheme of the methods is proposed. For each method the number of principles and theoretical approximations required to derive the equation which grounds it, is considered as a comparison criter…
The crystallisation of xFe 2 O 3 (100-x)P 2 O 5 , (14≤x≤40) glasses has been investigated by differential thermal analysis, x-ray diffraction analysis and Raman spectroscopy. The glasses were heat treated in dry argon from 298 to 1143 K. The crystallisation temperature and number of crystallised phases depended upon t…
Hydrogen outgassing is the most significant factor limiting the attainment of outgassing rates below 10−12 mbar l s−1 cm−2 in stainless steel vacuum systems. This limit turns out to be crucial in very large vacuum systems, like the VIRGO vacuum tubes (2 tubes 1.2 m diam, 3000 m length). Heating the raw material at 400…