Materials Literature
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The behaviour of a model glass forming liquid is analyzed for a range of densities, with a focus on the temperature interval where the liquid begins to display non-Arrhenius temperature dependence on relaxation γ. Through analyzing the dynamics along with the properties of local potential energy minima sampled by the…
The use of a C3 complex bearing three imidazolate groups as a ‘building block’ allowed us to synthesize an infinite corrugated two-dimensional (2D) low-spin Fe(III)–high-spin Mn(II) polymer exhibiting weak ferromagnetic intralayer interaction through imidazolate bridge.
The microstructure, crystal structure, and morphology of oxide films growing on zirconium alloys have been studied to better understand the effect of tin on the corrosion of Zircaloy. Zr-Sn-Fe-Cr sheets whose tin content varied from 0.09 to 1.41% were prepared and corroded in 400°C static steam for 300 days. The weigh…
This thesis concerns the development of a systematic design procedure and predictive models for solution crystallisation processes, with a focus on both product and process performance.The introductory chapter starts with a discussion of the application, advantages and problems of crystallisation in the chemical proce…
The effects of biaxial stress on the magnetic properties of pure iron discs are reported. Isostress changes in the coercivity are well described by an effective stress /spl sigma//sub EFF/=/spl sigma//sub x/-/spl sigma//sub y/. Irreversible, stress-induced magnetization changes are presented in the form of contours in…
The spectroscopic properties of lanthanide(III) complexes with Schiff base ligands (substituted salicylaldimines) are described. Optical absorption spectra of Nd(III), Ho(III) and Er(III) complexes dissolved in chloroform were recorded. The dipole strengths of the transitions were determined experimentally and paramet…
The second part of this series of papers reviews well-known factors characterising cloth structure and analyses their advantages and shortcomings. An opinion is expressed that their main shortcoming is due to an inexact estimation of the influence of the weave. An integrated structure factor of woven fabric is propose…
Polyaniline was chemically synthesized in aqueous acidic medium (HCl) with ammonium peroxydisulfate [(NH4)2S2O8] as the oxidizing agent, using a procedure described in the literature. Because the synthesis of polyaniline was carried out in aqueous acidic media, the obtained product consisted of emeraldine hydrochlorid…
Barium titanate thin films have been prepared by chemical spray pyrolysis. Aqueous spray solutions of titanium isopropoxide and barium acetate, equimolar with respect to titanium and barium, were used as precursors. Deposition was carried out at a substrate temperature of 250 °C. As-deposited films are amorphous. Film…
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…