Materials Literature
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Materials for high-performance electrochromic windows must fulfill various requirements, e.g., high optical contrast, fast response time, and stability. The construction and characterization of a device with technologically interesting properties are described. The device uses two active polymer electrode materials wi…
Dielectric, DTA and domain structure investigations (300 K-750 K) have been carried out for ceramics and two types of single crystals of silver niobate AgNbO3. Additional phase of the orthorhombic symmetry has been found in temperature range 630 K-638 K.
Three sugar-integrated gelators bearing a p-nitrophenyl group as a chromophore were synthesised. D-Mannose-based compound 3 was too soluble in most organic solvents to act as a gelator whereas D-galactose-based compound 2 was sparingly soluble in most organic solvents. D-Glucose-based compound 1 was moderately soluble…
BxC1–xcompounds (x≤0.25) have been prepared by the thermal CVD technique. The aim of this paper is to better characterize some specific boron rich compositions that are not yet satisfactorily described. Both structural and physical properties have been investigated; including low temperature direct current resistivity…
The space charge in full size 250 kV HVDC power cables was measured using the pulse-electroacoustic method. Measurements of two types of newly developed DC XLPE cables with 20 mm insulation were taken under a DC voltage of 500 kV with the conductor temperature at room temperature and at 85/spl deg/C. A qualitative ana…
A range of oxo-centred, carboxylate-bridged triiron complexes of general formula [Fe3O(O2CMe)6L3]X (L = py, 3-H2Npy, 4-H2Npy, 3-NCpy, 4-NCpy or 4-CH2CHpy, X = ClO4–) and [Fe3O(O2CR)6(py)3]X (R = But, Ph, CH2Cl, CCl3, CH2CN or 4-NO2C6H4, X = ClO4– or NO3–) has been synthesized, some for the first time. The [Fe3O(O2CPh)…
Fluorescence dynamics of the /sup 3/H/sub 4/ and /sup 3/F/sub 4/ energy levels of Tm/sup 3+/ ions in LiYF/sub 4/ single crystals codoped with Tb/sup 3+/ or Eu/sup 3+/ ions were experimentally investigated and confronted with classical energy-transfer models: direct cross-relaxation-type energy transfers between donor…
The new Rietveld program BGMN is introduced with its unique features especially useful for fully automatic quantitative phase analysis. Some examples including layer silicates are presented.
A method of calculating fatigue life of bearing steels, which accounts for the material fatigue process in relation with its microstructure, is required for optimizing these materials. Such a new approach is presented for bearing steels submitted to rolling contact fatigue, for which inclusions are well known to play…
3 + 3 Condensed optically active hexaaza triphenolic macrocyles 1 and 2 are synthesised and characterised; molecular and close packing structures of macrocycle 2 are discussed.
We have created photochromic amorphous molecular materials containing an azobenzene chromophore, 4-[di(biphenyl-4-yl)amino]azobenzene and 4,4′-bis[bis(4′-tert-butylbiphenyl-4-yl)amino]azobenzene (t-BuBBAB), which readily form amorphous glasses above room temperature and exhibit photochromism in their amorphous films.…
A brief review is presented of theoretical predictions and experimental observations concerning polar (pyroelectric, ferroelectric and antiferroelectric) achiral mesomorphic phases.
In methanol, the defect nitrosylpolyoxomolybdate [Mo5O13(OMe)4(NO)]3– reacts with Ag+ to give the complex [Ag2{Mo5O13(OMe)4(NO)}2]4– which displays attractive interactions between the two square-planar closed-shell AgI cations.
Optically active ‘adjacent’ type non-centrosymmetrically substituted phthalocyanines (Pcs) and benzo-substituted Pcs having π-systems with C2v symmetry have been synthesized in high yields in a mixed condensation using bisphthalonitriles (which do not racemize under general Pc formation conditions) and a second phthal…
Spectrophotometric pKa determination for p-tert-butylcalix[5]arene (H5L) in acetonitrile (pKa1 = 11.5 ± 0.7, pKa2 = 15.4 ± 1.0 at 298 K) evidenced both intra- and inter-molecular stabilisation of the deprotonated forms. Dimeric complexes [Ln2(H2L)2(dmso)4] (Ln = EuIII, GdIII, or TbIII; dmso = dimethyl sulfoxide) were…
The salts of the tetranuclear vanadium(III) ions [V4O2(O2- CEt)7(L–L)2]z (L–L = bpy, z = +1; L–L = pic–, z = –1) with a V4 butterfly topology and a S = 3 ground state have been found to exhibit out-of-phase ac susceptibility signals, a signature of single-molecule magnets.
Cs 2.5 H 0.5 PW 12 O 40, a hydrogen cesium salt of dodecatungstophosphoric acid, exhibited a high catalytic activity for hydrolysis of ethyl acetate in large excess water. Adsorption of water demonstrated that interactions between Cs 2.5 H 0.5 PW 12 O 40 and water are weak. This nature and the strong acidity are possi…
A novel cationic delivery system composed of magnetic aminodextran microspheres (MADM) 1-2 microm in diameter was evaluated along with neutral magnetic dextran microspheres (MDM) for their ability to target intracerebral rat glioma-2 (RG-2) tumors in vivo. The tissue distribution of the microspheres was determined fol…
TOPO (tri-n-octylphosphine oxide)-capped ZnSe (in the form of close to mono-dispersed nanoparticles) has been prepared by a single source route using ethyl(diethyldiselenocarbamato)zinc(ii) as a precursor. The nanoparticles obtained show quantum size effects in their optical spectra and exhibit near band-edge luminesc…
Pentafluorothiophenol, thiophenol, 1-decanethiol, 1-hexanethiol, benzoic acid and cyanoacetic acid, which are confirmed to bind to the surface of ZnS nanocrystallites, induce phase transition of ZnS nanocrystallites from the hexagonal to the cubic phase, with retention of the crystalline size of 3 nm at ambient temper…