Materials Literature
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Tetra(n-butyl)ammonium ds-diacidooxophthalocyaninato(2-)niobates(V) and -tantalates(V), ( n Bu 4 N) cis [M(X) 2 Opc 2- ] (M = Nb, Ta; X = F, Cl, NCS, N 3 ), are obtained by the reaction of cis [M(Cl) 3 pc 2- ] or cis [M(Cl}Opc 2- ] (M = Nb, Ta) with the respective tetra(n-butyl)ammonium salt. ( n Bu 4 N) cis [Nb(F) 2…
Abstract A new CuII-NiII heterodinuclear complex [Cu(PEoxd)Ni(bpy)2](ClO4)2·1/2H2O has been synthesized and its structure determined by single crystal X-ray analysis. Crystal data: space group P21/c with a = 9.226(2) Å, b = 30.857(6) Å, c = 14.241(3) Å, and β = 97.36(3)°, V = 4021(2) Å3, Z = 4. Magnetic measurement in…
A simple double-well potential model is established. It shows that the nature of the low-frequency dielectric constant in ferroelectrics is the additional hopping of the off-center ions in multi-site potential. The co-operative effect causes the fact that the Curie-Weiss law is obeyed. The mechanism of the molecular f…
The TL dosimetric properties of the LiF thin films produced on aluminium and stainless steel substrates has been investigated. The influence of some deposition parameters and thermal annealing on the film TL response was studied. The films were irradiated with a 60Co source with doses from 0.2 to 100 Gy. The films' TL…
The initiation and propagation of nanometre-scale cracks has been investigated in detail using dislocation modelling and in situ transmission electron microscopy (TEM) observations for the intermetallic compound Fe3Al under mode I loading. A discrete dislocation model is proposed to assess quasistatic equilibrium, emi…
The complex dielectric constant of a liquid crystal material, 4-cyano-4′-alkyl-biphenyl (5CB), in a low frequency region was measured by taking the thickness of a specimen as parameter. The results were analyzed by introducing an equivalent circuit of a novel concept by taking two kinds of contributions into account:…
The first-order hyperpolarizability β was determined for bent-shaped molecules P-8-PIMB and P-8-O-PIMB using the Hyper Rayleigh scattering method. βs of these materials were found to be relatively large, about 30×10−30 esu. These results are consistent with the second-harmonic generation experiments performed in their…
It is well known that the software Surface Evolver (SE) models the geometry of minimal surface area structures such as a foam. Here we have modelled with SE the gas-diffusion phenomenon responsible for the coarsening of liquid foams. We took as an initial condition, a real reconstructed foam obtained by optical tomogr…
Among the copper base shape memory alloys the most popular are CuZnAl alloys which however show several features like: tendency to stabilisation, limitation of the effect to low temperatures, lattice defects multiplication after numerous cycling and low decomposition temperatures. This defines the directions of invest…
The new compound hexacaesium hexatellurido digermanate(III), Cs 6 Ge 2 Te 6 , has been prepared by reacting the elements in a stoichiometric ratio at 923 K in an evacuated silica glass tube. The title compound crystallizes as black columns and is isostructural to K 6 G e 2 Te 6 (C2/c, a = 17.027(2), b = 14.237(1), c =…
Conductivity measurements on a smectic liquid crystal with terminal diol-groups are reported. The average conductivity in the liquid crystalline state exceeds the conductivity of the isotropic melt by a factor of 2. This strongly unusual behaviour supports the assumption of fast protonic conductivity in smectic diols,…
The excited-state complex (exciplex) formation that results from the photoinduced interaction of water-soluble cationic copper(II) 5,10,15,20-tetrakis[4-(N-methylpyridyl)]porphyrin [Cu(TMpy-P4)] with calf-thymus DNA has been studied in detail by resonance Raman (RR) spectroscopy using both ∼10 ns and ∼50 ps laser puls…
Raman spectra of the sodium salts of uridine and deoxyuridine monophosphoric acid, Na2(3′-UMP)·4H2O, Na2(5-UMP)·7H2O and Na2(5′-dUMP)·5H2O, and the cadmium salt, [Cd(5′-UMP)(H2O)2]·2H2O, were examined. Several spectral differences were observed owing to nucleoside conformational differences in the uridine residue. The…
Abstract The stability constants of several divalent first row transition and trivalent lanthanide metal complexes were determined by capillary electrophoresis (CE) methods. Four different approaches, i.e. direct formation, ligand exchange, metal exchange and metal‐ligand double exchange were developed. To verify if t…
HPLC analysis of the methanol-extractable fractions of polymers was used to study the formation of cyclic oligomers during the non-activated anionic polymerization of 6-hexanelactam initiated by sodium or magnesium salt of 6-hexanelactam and ethylmagnesium bromide at 190°C. It was demonstrated that the nature of the c…
A novel two-step method combining rubbing and UV-irradiation based on ladderlike polysilsesquioxanes (LPS) containing cinnamate and azobenzene side chains was developed to obtain alignment layers which features a high surface pretilt angle and good stability. At the first step, a low pretilt angle of 1–3° was generate…
We have performed a preliminary study by light transmission of the electro-optical behaviour of several cells prepared either from hydroxypropylcellulose (HPC) or HPC with cellulose acetate (CA) (1% w/w) cross linked in both cases with 1,4-diisobutanocianaie (BDI) (7%w/w) and different concentrations of a commercial n…
Preparation of silicon-organic films for LC alignment is described. Effect of the molecular structure of organic substituents in siloxane chains on type of LC the alignment (homeotropic, tilted, planar) is considered. Contribution of polar and dispersion parts of the surface energy of siloxane films is discussed.
Using the continuum theory the influence of the external magnetic field on the ferrocholesteric — ferronematic phase transition is analyzed. The field being applied normal to the helix. Soft homeotropic coupling between the magnetic particles and the cholesteric molecules is assumed. The diamagnetic anisotropy of the…
The method presented in this paper pertains to an optical roughness meter that considers a fabric in all surface directions. A previous paper presented a tribological method for investigating textile fabrics, which used a roughness meter with a contact between the probe and the surface. However, a contact is not alway…