Materials Literature
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Azospirillum brasilense Sp7 and its ntrA (rpoN), ntrBC, and ntrC mutants have been evaluated for their capabilities of poly-3-hydroxybutyrate (PHB) accumulation in media with high and low ammonia concentrations. It was observed that the ntrBC and ntrC mutants can produce PHB in both low- and high-C/N-ratio media, whil…
Two phenylphosphinic acid derivatives of tetraaza macrocycles, (1,4,7,10-tetraazacyclododecanetetrayl)tetrakis(methylene)tetrakis(phenylphosphinic acid) [(H4L1) and (1,4,8,11-tetraazacyclotetradecanetetrayl)tetrakis(methylene)tetrakis(phenylphosphinic acid)] (H4L2), were synthesised and the crystal structures of H4L2…
Abstract. Presence of coherent interfaces within crystallites, referred to as «annealing twins, » has many effects on the properties of several fcc metals and alloys. The mechanism of the formation of these twins have been subject of numerous studies over fifty years. Although much progress has been made in recent yea…
Tuning thermodynamic driving force and electronic coupling through structural modifications of a carotene (C) porphyrin (P) fullerene (C60) molecular triad has permitted control of five electron and energy transfer rate constants and two excited state lifetimes in order to prepare a high-energy charge-separated state…
Polycrystalline copper is investigated by a new surface sensitive in situ X-ray absorption spectroscopy method at the oxygen K-edge and copper L2,3-edges under, for the first time, dynamic steady-state methanol-oxidation reaction conditions close to those used in practice. It is found that the selective oxidation of m…
The fire-induced degradation chemistry of a random copolymer of methyl methacrylate with a flame retardant phosphate–methacrylate comonomer has been studied to gain an insight into the mechanisms of fire retardancy in the model system and thus help to provide a fundamental basis for the further development of fire res…
The aim of this study was to develop further surface-enhanced Raman scattering (SERS) substrates appropriate for the in situ environmental determination of chemicals in sea-water important for global environmental problems. By encapsulating silver colloids in a sol–gel-derived xerogel, SERS-active coatings were produc…
A computational technique is presented to calculate x-ray diffraction patterns from nanocrystalline materials containing defects. Stacking and twin faults were introduced into spherical and cubic shaped face-centered cubic nanocrystals. The calculated diffraction patterns from the faulted nanocrystals display peak shi…
Photoexcitation of (nBu4N)4W10O32 is a suitable mean of oxidizing cyclohexene and cyclooctene with O2 at room temperature and pressure. This process can be carried out in homogeneous solution as well as using the decatungstate in a dispersed form after its heterogenisation on silica. Cyclohexene and cyclooctene are ma…
Recently a new monoclinic phase in the Pb(Zr1−xTix)O3 ceramic system has been reported by Noheda et al.[1] for a composition of x=0.48. In this work, samples with Ti contents x=0.47 and 0.50, which are both tetragonal below their Curie point, have been investigated. In the sample with x=0.50, the tetragonal phase was…
It is known that for creating advanced polyolefin/cement-based composites the polymer surface should be converted into a layer which is compatible with the inorganic component. In this respect, plasma chemistry offers additional solutions to the wet chemistry approach. It has been demonstrated during the last decade t…
High quality MCM-41 silica with thick walls and a very narrow distribution of mesopore size has been synthesized in a relatively short time via ultrasound radiation.
This paper gives theoretical results on spinodal decomposition for the Cahn--Hillard equation. We prove a mechanism which explains why most solutions for the Cahn--Hilliard equation starting near a homogeneous equilibrium within the spinodal interval exhibit phase separation with a characteristic wavelength when exiti…
Here we describe the synthesis and electrochemical polymerisation of 2,5-di(2-thienyl)-3-(3-cyanopropyl)pyrrole, 2,5-di(2-thienyl)-3-(3-cyanopropyl)furan, and 3′-(3-cyanopropyl)-2,2′:5′,2″-terthiophene. We report a synthetic methodology to these important conducting polymer precursor compounds that is facile, convenie…
Factors Affecting Passivation of Cu(Mg) Alloy Films, Lee, Wonhee, Cho, Heunglyul, Cho, Bumseok, Kim, Jioung, Kim, Yong‐Suk, Jung, Woo‐Gwang, Kwon, Hoon, Lee, Jinhyung, Reucroft, P. J., Lee, Chongmu, Lee, Jaegab
The new dodecadentate tripodal ligand trenterpy in the presence of lanthanide triflates leads to the self assembly of homotrinuclear lanthanide complexes.
The magnetic and crystallographic properties of induction-melted SmMn/sub 6-x/Fe/sub x/Ge/sub 6/ compounds, where x is 0, 0.5, 1.0, and 1.5, have been studied using X-ray diffraction and bulk magnetic measurements between 30 and 490 K. All of the samples crystallized in the YCo/sub 6/Ge/sub 6/-type structure with the…
This work presents a comparative study of the compatibilization of four binary blends with slight differences in their chemical structures. The natural polymers chitin (QA) and chitosan (QN) are blended with polyamide 6 (PA6) and polyamide 66 (PA66). The results, obtained using differential scanning calorimetry, infra…
A nickel(II)tetramer with azide and di-2-pyridyl ketone (dpk) of general formula [Ni(dpk·OH)(N3)]4·2H2O (dpk·OH being the deprotonated gem-diol resulting from hydrolysis of dpk) was synthesized and structurally characterised through X-ray single crystal diffraction analysis and IR spectroscopy. The structure consists…
The linear combinations of Gaussian-type orbitals–fitting function (LCGTO-FF) technique is used to study the zero-pressure properties of crystalline uranium dioxide, a prototypical heavy element bearing Mott–Hubbard insulator. The effects of several common approximations are examined: (1) scalar vs. full relativity; (…