Materials Literature
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Measurements are reported for the d.c. Kerr response and the pretransitional behaviour of a new liquid crystal, 4-cyanophenyl 4-pentylbenzoate at and above the nematic-isotropic phase transition temperature. The real parts of the third order nonlinear susceptibilities chi(3) at and above the nematic-isotropic transiti…
In addition to the known sterols and ketosteroids beta-sitosterol (24 alpha-ethylcholest-5-en-3 beta-ol), stigmasterol (24 alpha-ethylcholesta-5,22-dien-3 beta-ol), campesterol (24 alpha-methylcholest-5-en-3 beta-ol), beta-sitostenone (stigmast-4-en-3-one, 24 alpha-ethylcholest-4-en-3-one), stigmastenone (stigmasta-4,…
Abstract Reversibility in the formation reaction of a series of the oxo(peroxo)porphyrinatomolybdenums, [MoVIO(tmp)(O2)] 1, [MoVIO(tdcpp)(O2)] 2, [MoVIO(ttp)(O2)] 3, [MoVIO(tdmpp)(O2)] 4, and [MoVIO(tpp)(O2)] 5, was studied. In these dioxygen complexes with various porphyrin rings, two complexes, 2 and 4, were newly p…
Systematic studies on the sorption and diffusion behaviors of gases in low-molar-mass liquid crystalline substances (LCs) have been performed. The experiments were carried out in different gas atmospheres over temperature ranges which covered the phase transitions of the LCs under investigation, and at pressures of up…
A stable one-dimensional quasicrystal has been found for Al-Co-Ni which is related closely to the decagonal phase in this system. It exists as a high-temperature state above 900 C in a range of compositions between approximately 71 and 71.5at.% Al between 18at.% and 22at.% Co. The modulation length along the periodic…
Thin films of Cu 2 O were electrodeposited and characterised by techniques including XRD, SEM–EPMA, and spectrophotometry. The structure, morphology, composition, and optical properties of the films depend on the electrochemical bath and deposition parameters. The kind of substrate pretreatment process also seems to h…
Magnetic properties of Cd1−yMnyS nanocrystals have been studied. They vary with the particle size and markedly differ from those observed in the bulk phase, in particular their interactions drastically increase compared to those observed in the latter case. A Mn2+–Mn2+ interaction enhancement with decreasing size invo…
Crystalline ${\mathrm{Cs}}_{3}{\mathrm{Bi}}_{2}{\mathrm{I}}_{9},$ with the ${P6}_{3}/mmc$ symmetry at room temperature was studied by Laue and four-circle neutron diffractometry from room temperature down to 50 K. At ${T}_{0}=220 \mathrm{K}$ the crystal undergoes a second-order proper ferroelastic phase transition to…
The synthesis and applications of carbon nanotubes, a new form of crystalline carbon, are reviewed. In particular, the results obtained in the authors' laboratory are summarized, including the preparation of highly crystalline multi-walled carbon nanotubes; also discussed are the valence band and core level structures…
The morphology, thickness, oxidation and illumination effects in dodecylsulphate doped polypyrrole films can be qualitatively observed by EIS and consist in variations of interfacial and bulk resistances and capacitances of a proposed equivalent circuit. The circuit well with the measured spectra of films obtained wit…
The role of alloying elements and the effect of prior cold work on microstructural evolution in Supral type alloys during high temperature straining has been investigated by examining a range of binary and ternary alloys containing varying amounts of Cu and/or Zr. After hot compression, specimens were rapidly cooled t…
Silver black was deposited on SiO 2 /Si substrates by thermal evaporation under various gas atmospheres (Ar and N 2 ). The dependence of surface morphology evolution of silver-black coating on deposition parameters was studied. The metal-black layers obtained by evaporation are reproducible. With an increase of deposi…
Abstract We have prepared a novel water-soluble silver(I) complex showing effective antibacterial activities K12[Ag8(mba)10]·12H2O (1a, H2mba = 2-mercaptobenzoic acid) from the Ag2O : H2mba : KOH = 1 : 4 : 8 molar ratio reaction in aqueous media and determined its crystal structure. The X-ray crystallography revealed…
Carbon-chain heterofunctional oligoperoxides (HFOs) with ditertiary peroxidic, carboxy, or hydroxy groups formed stable coordinated complexes through their interaction with transition-metal salts in organic solutions. The oligomeric metal complexes (OMCs) were separated from the reaction mixture and investigated throu…
The exchange mechanism of proton and hole in protonic conductor CaZrO 3 has been investigated by photoemission spectroscopy. The Fermi level is higher by about 1.0 eV through proton doping, indicating that protons exchange with holes. The defect chemical calculation proves that the change of the number of the protons,…
Transmission electron microscopy (TEM) and Cryo-TEM were used to study the growth kinetics of poly(3-hydroxybutyrate) granules produced by in vitro polymerization. The in vitro formation of poly(3-hydroxybutyrate) uses a recombinant form of the PHA synthase to polymerize [R]-(–)-3-hydroxybutyryl-CoA. Since the in vitr…
Abstract KCl-, KBr-, and KI-kaolinite intercalation complexes were synthesized by gradually heating potassium-halide discs of the dimethylsulfoxide (DMSO)-kaolinite intermediate at temperatures to 330°C. Two types of complexes were identified by infrared spectroscopy: almost non-hydrous, obtained during thermal treatm…
N-Vinylformamide (VFA), the simplest member of the enamide group, is the key compound in the synthesis of linear cationic polymers with primary amino groups. In recent decades VFA has been the object of intensive research activity in industry and in universities with the aim of developing an economic method of synthes…
A new polidentade ligand, N-(2-hydroxybenzyl)-N-(2-pyridylmethyl) [(3-chloro)(2-hydroxy)]propylamine (H2BPClNOL), was synthesized and two Fe2III complexes containing the FeIII(m-alcoxo)2FeIII core were structurally and magnetically characterized. Complex [Fe2(BPClNOL)2(OAc)]ClO4 (1) differs from complex [Fe2(BPClNOL)2…
The influence of a continuous sound field on the first oscillation cycle and on the cavitation luminescence of a transient laser-induced bubble is investigated experimentally. The variation of the collapse phase is predicted with a simple numerical model and compared with experiment. Bubble dynamics is mainly influenc…