Materials Literature
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Abstract Two clay fractions of a Cambrian claystone from Estonia, consisting essentially of illite and 20% expandable illite-smectite, (I-S) were treated with C 12 and C 18 alkylammonium cations for K-exchange. Both the untreated and treated samples were dated by the K-Ar method. The treated clays lost several percent…
Nanopowders of Bi2Ti2O7 with various Na+ modifications were synthesized by chemical coprecipitation, and their phase structures transform into a solid solution of Bi4Ti3O12 and Bi2Ti4O11 after sintering at high temperature. The dielectric peak at around 517 °C in Bi4Ti3O12 is related to the domain transformation at 44…
The principal criteria for the corrosion resistance of intermediate-grade ferritic stainless steels (SS) were examined in a neutral chloride (Cl−) solution. The effect of increasing quantities of chromium and molybdenum was estimated for several heats in terms of the breakdown potential (Eb). The effect of inclusions…
Large sign-alternating charge clusters formed by the charged side groups of amino acid residues and N- and C-terminal groups were found in the majority of considered globular proteins, namely 235 in a total of 274 protein structures, i.e. 85.8%. The clusters were determined by the criteria proposed earlier: charged gr…
AN INTRODUCTION TO PILLARED CLAYS. The synthesis, characterization and some applications in catalysis of pillared clays are described at an introductory level. The use of x-ray diffraction, surface area measurements, thermal analysis, IR spectrophotometry and solid-state NMR in the characterization of pillared clays i…
This paper analyses the causes of the early corrosion failure of phosphorus deoxidized copper tubes which formed part of an air-conditioning unit. The failure of the tubes occurred after 2–3 months service time. X-ray photo-electron spectroscopy (XPS), Auger electron spectroscopy (AES), scanning electron microscopy (S…
A previously constructed large continuous random network model of amorphous ${\mathrm{SiO}}_{2} (a\ensuremath{-}{\mathrm{SiO}}_{2})$ glass with 1296 atoms and periodic boundary condition has been relaxed with four different sets of pair potentials under constant pressure. By removing the restriction of the cubic symme…
We report evidence for a significant increase of bulk dislocation density upon poling of polycrystalline ${\mathrm{BaTiO}}_{3}.$ The synchrotron high-resolution x-ray-diffraction measurements yield a dislocation density on the order of ${10}^{9}/{\mathrm{cm}}^{2}$ and an associated strain-energy increase of about 20 $…
Niedrigenergetische Metall-Ligand-Charge-Transfer-Übergänge sind mit den sehr großen molekularen NLO-Koeffizienten β der Komplexe [RuII(NH3)5(N-R-4,4′-bipyridinium)]3+, R=Methyl, Phenyl, 4-Acetylphenyl, verbunden. Chemische Oxidation zu den RuIII-Komplexen löscht die MLCT-Banden und schwächt die NLO-Aktivität deutlich…
S. Ajith Kumar C. L. Nagendra H. Ganesh Shanbhogue G. K. M. Thutupalli Laboratory for Electro-Optics Systems (LEOS) ISRO Satellite Center (ISAC) A3-6 Peenya Industrial Estate Bangalore 560058 India Abstract. Design optimization and experimental studies of bandpass optical filters useful in the near-IR region from 1200…
The monolayer behaviors of poly( N -alkylmethacrylamides) with various pendant substituents, octyl (POMA), dodecyl (PDDMA), tetradecyl (PTDMA), hexadecyl (PHDMA), or octadecyl (PODMA), on the water surface and the properties of the Langmuir−Blodgett (LB) films were investigated. Among those polymers, PTDMA formed the…
The electrochemical, galvanic, and mechanical responses of grade 2 titanium in 6% sodium chloride (NaCl) solution at different temperatures were investigated. The initial corrosion potential and cathodic reaction rate increased with decreasing pH and increasing temperature. The initial corrosion potential changed when…
The initial stages of electrochemical intercalation of lithium in sputter-deposited tungsten oxide thin films were studied. The as-deposited films show a substantial irreversible uptake of lithium without an electrochromic effect. This trapping of lithium is associated with the presence of excess oxygen in the film. T…
Abstract Samples of Silica Springs allophane from Tongariro National Park, New Zealand, having Al/Si atomic ratios in the range 1.1-1.9, were studied by 27 Al nuclear magnetic resonance (NMR) spectroscopy with high field strength (9.4 and 11.7 T) and fast magic-angle spinning (MAS) (9-13 kHz). Spectra for all samples…
Changes in surface reactivity produced by different types of liming in a Chilean Andisol were determined. Barros Aranas soil with 53% aluminum (Al) saturation and 4.8 pH was incubated with different amounts of calcitic and dolomitic lime. Each cmol of calcitic or dolomitic lime applied per kg of soil increased the pH…
In order to attempt to industrial applications of superplastic forming, the present authors have investigated to design high strain rate superplastic zirconia ceramics. Very recently we found a new ceramic with high strain rate superplasticity (HSRS). A new ceramic, ZrO 2 (3Y)-2mol%CaO-2mol%TiO 2 were examined at defo…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and the Initiator Activity of Fluorenyltriphenylphosphonium Salts in the Cationic Polymerization of Epoxide. Novel Thermally Latent InitiatorsTatsuya Toneri, Ken-ichi Watanabe, Fumio Sanda, and Takeshi EndoView Author Information Research Laboratory of Resources Utili…
Silica powders and films with embedded organic liquids (OLs) that are storage stable can be prepared with high OL concentrations when modern sol-gel techniques are used. The preparation and thermal release behavior of silica sol-gel glasses with different embedded organic liquids are described and the results discusse…
Abstract The structure of antimonian dussertite, (AsO 4 ) 2 (OH,H 2 O) 6 , has been refined in space group R3̄ m with a 7.410(3), c 17.484(4) Å, Z = 3, to R = 3.2 % and R w = 3.7 % using 377 observed reflections with I ≥ 3 σ( I ). The structure is of the alunite-type and consists of sheets of corner-sharing (Fe 3+ ,Sb…
Abstract Pd catalysts supported on various metal oxides were investigated for the low-temperature catalytic combustion of methane. Of the catalysts examined, a Pd/SnO2 catalyst demonstrated excellent activity despite its low specific surface area. The activity of the Pd/SnO2 catalyst was lowered with the addition of M…