Materials Literature
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The connection is made between macrocycle deformations obtained from normal-coordinate structural decomposition (NSD) and the vibronic molecular states and spectra of porphyrins. NSD is a procedure that provides a description of the time-averaged distortion of a porphyrin in terms of normal-coordinate displacements fr…
Abstract The crystal structures of 2,4-di-bromo-aniline (A; C 6 H 5 NBr 2 ), 4-iodo-anisole (B; C 7 H 7 OI), 2-iodo-benzenemethanol (C; C 7 H 7 OI), 2-amino-benzothiazole (D; C 7 H 6 N 2 S) and 2-amino, 5-bromo-pyridine (E; C 5 H 5 N 2 Br) have been determined from X-ray powder diffraction data. Grid search and Rietve…
The impact of electron probe microanalysis on the study of geological and planetary materials has been tremendous. Electron microprobes evolved into routine analytical instruments in geological research laboratories as instrument capabilities improved and applications to geologic/planetary materials expanded. The cont…
Enthalpies of drop solution for a suite of substituted pollucites with the compositions CsTi x Al 1− x Si 2 O 6+0.5 x , 0 ≤ x ≤ 1, which are synthesized using the sol–gel method, have been measured in molten lead borate (2PbO·B 2 O 3 ) at 701°C. As Ti 4+ substitutes for Al 3+ , the enthalpies of drop solution become l…
The atomic motion of Ag + ions in superionic and liquid Ag 2 Se and Ag 2 Te has been investigated by coherent quasi-elastic neutron scattering. The presence of a Q -dependent broadening of the quasielastic peak indicates that the Ag + ion is mobile in the superionic phase of both materials. This motion takes place wit…
Fourier transform infrared (FT-IR) spectra have been recorded of cement blends containing between 0 and 25% limestone, as well as for 100% limestone. Integrated intensity of the out-of-plane vibration of the carbonate ion was used in relation to the integrated intensity of a peak remaining fairly constant in the cemen…
In this work, we describe the synthesis of a new dimethacrylate phosphonate monomer by condensation of methacryloyl chloride with a phosphonate diol resulting from a radical addition of allyldiethyl phosphonate with 3-mercapto propane-1,2-diol. The photochemical polymerization of this new monomer was first studied as…
Summary Weathering of soil minerals under forest seems to depend on the species present. To study the influence of tree species we placed unweathered vermiculites in the soil and assessed the impact in terms of saturation index of earth‐alkaline cations and cation exchange capacity in 64 forest stands, dominated by di…
Abstract The thermal degradation of poly(vinyl chloride) (PVC) and blends of PVC with polystyrene has been studied using thermogravimetric analysis coupled to Fourier transform infrared spectroscopy. The degradation of PVC commences at weak links by an ionic pathway, but there is evidence to suggest the presence of a…
A technique for the accurate determination of the surface potential US and its evolution during irradiation, is proposed. The technique is based on detecting both backscattered (BSE) and secondary electrons (SE) in a scanning electron microscope (SEM). The (BSE+SE) spectra are measured using a compact, highly sensitiv…
The bamboo fibres belonging to the family of Dendrocalamus strictus were coated with a blend of epoxy/polycarbonate with varying polycarbonate content. The chemical resistance of these fibres to some acids, alkalis and solvents was studied. The tensile load at break for these fibres was determined. The coated fibres s…
Polymer resins, because of their low cost, versatility, and ease of use, are the principal component in many static-control items. These items include containers and packages used to store and transport sensitive electronics. This paper seeks to explain how polymers are used for these demanding applications by providi…
We have performed atomic-scale simulations of cross-slip processes of screw dislocations in copper, simulating jog-free dislocations as well as different types of jogged screw dislocations. Minimum-energy paths and corresponding transition state energies are obtained using the nudged-elastic-band path technique. We fi…
Two linear polyamide conjugates of Gd(DTPA)2- were synthesized and characterized by high-resolution nuclear magnetic resonance (NMR) spectroscopy and size exclusion chromatography (SEC). DTPA was copolymerized with two different diamines, 1,6-hexanediamine and trans-1,4-cyclohexanediamine, yielding the polymers DTPA-H…
The adsorption chemistry of CO on clean and Pt-supported TiO 2 (110) was investigated. It was found that surface structure of TiO 2 plays an important role in the chemistry that takes place at the surface. On the reduced (1 x 2)-reconstructed surface, CO desorbed at 140 and 170 K, while only desorption at 140 K was ob…
Batch cultures of Ralstonia eutropha in chemically defined media with acetic acid (HAc) as the sole carbon source were conducted to investigate acetate utilization, formation of poly(3-hydroxybutyrate) (PHB) and growth of active biomass (ABM) under different carbon to nitrogen (C/N) weight ratios. The specific acetate…
The effect of Al 8 B 4 C 7 used as an antioxidant in MgO–C refractories and the behavior of Al 8 B 4 C 7 in CO gas were investigated in the present study. Al 8 B 4 C 7 was found to react with CO gas, to form Al 2 O 3 ( s ), B 2 O 3 ( l ), and C( s ), at temperatures >1100°C. The Al 2 O 3 reacts with MgO to form MgA…
Polyelectrolyte complexes (PECs) are formed through the electrostatic interactions between polymers carrying opposite charges. Here are presented results of basic studies on the PECs of chitosan with other polysaccharides such as sodium alginate, carboxymethyl cellulose, polygalacturonic acid and κ-carrageenan. An ext…
This paper develops an objective method of drafting pressure garments to provide predetermined skin-and-garment interfacial pressures on patients. To predict interfacial pressure induced by different sizes of pressure garments on a particular curved surface of the human body, the relationship between the tensile prope…
An oxygen-doped GeSbTe interface layer improves the overwriting characteristics of the phase-change optical disk in the blue wavelength. The thermal and optical properties of oxygen-doped GeSbTe film and its crystal structure were investigated. Crystallization temperature and activation energy of the amorphous Ge–Sb–T…