Materials Literature
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The fluorescence quenching and complexation behaviour of tetraphenylporphyrin (TPP) have been studied using fluoresence, electronic absorption spectra and the stopped-flow technique. The second-order fluorescence quenching rate constant (kq) increases in the order Ni2+ > Co2+ > Hg2+ > Sn2+ in methanol. Both Ni2+ and C…
Abstract One of the most important applications of the population balance approach to MSMPR crystallizer modelling is the recovery of crystal nucleation and growth rates data from steady‐state crystal size distributions (RANDOLPH, LARSON). A large number of studies have confirmed that both size‐dependent (growth rate…
We have examined HCN synthesis by the ammoxidation of CH 4, C 2 H 6, and CH 4 /C 2 H 6 mixtures in air or O 2 at atmospheric pressure on α-Al 2 O 3 foam monoliths coated with 1−10 wt % Pt and on Pt−10% Rh gauzes. The HCN reaction system was found to be highly sensitive to the catalyst microstructure because we observe…
Second harmonic generation decay has been used to follow the orientational relaxation of dipolar chromophores either dissolved in (guest−host) or chemically attached to (side chain) an amorphous polymer host. The guest−host system investigated is the chromophore lophine-1 in a polyimide host and the side-chain system…
A Langmuir–Blodgett film of a platinized viologen-linked porphyrin is prepared, and steady photoinduced hydrogen evolution is observed with the porphyrin under steady-state irradiation.
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionSelf-Consistent Theory of Block Copolymers with Conformational Asymmetry Vol. 26, Number 25, December 6, 1993, pp 7070−7075J. D. Vavasour and M. D. WhitmoreCite this: Macromolecules 1996, 29, 15, 5244Publication Date (Web):July 15, 1996Publication History Published o…
A series of scientific expeditions in Indonesia for collecting informations and materials concerning locally used medicinal plants and Javanese traditional medicine "jamu" have been carried out by us since 1985. This article reviews pharmacochemical investigations of nine Indonesian medicinal plants: i.e. Pongamia pin…
We discovered a novel compound expressed by R2(Fe, M)17+δ in the compositional rangc between 2-17 and 1-12. Hong-Shou Li et al. reported R3(Fe, M)29 which is stoichiometric compound with monoclinic structure. These compounds show similar X-ray diffraction patterns.In this paper, syntheses of R2(FC, M)17+δ were attempt…
Abstract Twaron fiber is spun from the polymer poly(paraphenylene terephthalamide), PPT, and has a crystallinity of 82%. Wideangle X‐ray diffraction, combined with the multipeak resolution procedure, was applied to study the changes in the structure after annealing the fiber in the temperature range of 100–675°C. The…
A marine photosynthetic bacterium Rhodopseudomonas sp. strain W-1S, accumulated polyhydroxybutyrate (PHB) to 56% of the dry cell weight under microaerobic and photoheterotrophic conditions. The addition of NaC1 and phosphate was essential for the accumulation. Acetate was the best carbon source for PHB accumulation, w…
Friction characteristics of face-seal materials have been studied using a thrust-washer (face-loaded) contact fixture, which includes a rotating carbon ring against a stationary, mating silicon carbide (SiC) ring. A computerized test machine was used to conduct the friction measurements. Two types of carbon ring mater…
Abstract The mineralogical composition of soils along a toposequence formed on Quaternary‐aged alluvium from the northeastern portion of the island of Crete, Greece, and the examination of their mineral weathering characteristics should help provide an insight into the stage of weathering and relative age of the soils…
Aluminate sodalites containing the telluride and tellurite ions have been synthesised for the first time. The structures of Sr8[AlO2]12(TeO3)2 and its reduced product Sr[AlO2]12Te2 have been determined using Rietveld refinement of powder neutron diffraction data. In Sr8[AlO2]12Te2 the anion occupies a position at the…
Abstract The concept of a regular polyhedra helix is defined and the full set of such moieties are analysed. It is found that apart from trivial cases, eight distinct RPH exist.
The effect of incorporating poly[styrene- b -(ethylene oxide)], PS- b -PEO into PS/PEO composites has been examined microscopically and dielectrically. The addition of block copolymer stabilizes the dispersion of PEO in PS and can produce composites of PEO in PS in which the PEO domain size ranges from the size of the…
143Nd/144Nd isotopic ratio and rare-earth impurities are examined for high purity neodymium oxide prepared by six chemical companies. The isotopic ratios of the reagents are grouped into four and vary from 0.511463 to 0.512238. Some of the reagents contain impurities more than 1 ppm for lanthanum, cerium and samarium.…
The interaction of hydrogen cyanide (HCN) and hydrogen isocyanide (HNC) with Ni(111) is studied by using ab initio embedding theory. The Ni(111) surface is modeled as a three-layer, 28-atom cluster with the Ni atoms fixed at bulk lattice sites. The present calculations show that both HCN and HNC bind to the surface in…
Adsorption kinetics of a polydisperse sample of poly(ethylene oxide) were studied using total internal reflectance fluorescence (TIRF), a method whose signal is approximately proportional to the adsorbed chain number . The initial stages of the adsorption process were found to be approximately transport-limited, domin…
We investigate the phenomenon of bond alternation in ring molecules of the type (CH)2n, which occurs due to the Peierls instability. We prove that the energy-minimizing configuration of bond lengths always has period two when n is odd. When n is even, a new instability may destroy the periodicity two as long as n is n…
Geometries, dimerization energies, and harmonic vibrational frequencies have been calculated for InMH 6 and MBH 6 (M = B, Al, Ga, and In) using MP2 and DFT methods. Results for B 2 H 6 and GaBH 6 show good agreement with experimental data, with both methods giving comparable accuracy. Trends in the properties of InMH…