Materials Literature
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The synthesis of p-tert-butyltetramercaptotetrathiacalix[4]arene 1 bearing eight sulfur atoms was achieved in high overall yield (80%); the synthetic strategy used was based on the synthesis of p-tert-butyltetrathiacalix[4]arene 2, treatment of the latter with N,N-dimethylthiacarbamoyl chloride under mild conditions,…
The oxozirconium clusters Zr6O2(OPr)16(OOC–C10H6O)2(PrOH)2 and Zr10O6(OH)4(OOC–C6H4OH)8(OOC–C6H4O)8· 6 PrOH were obtained in quantitative yield, when Zr(OPr)4 was reacted with a 10-fold excess of 1-hydroxy-β-naphthoic acid and salicylic acid, respectively. The naphthoate-substituted cluster has a rather open structure…
The mesoporous silica molecular sieve MCM-41 can be obtained in a highly ordered form with various pore diameters if micelle packing is suitably controlled with a mixture of n-alkyltrimethylammonium bromide and n-alkyltriethylammonium bromide according to the length of the C12–C22 alkyl groups.
This paper summarizes the result of the questionnaire on current status of non-ceramic (composite) insulators in the world conducted by the Non-ceramic (composite) Insulators Technical Committee, Japan. Current use status, reasons for use, maintenance, failure occurrence and research activity of 16 responding utilitie…
The dependence of macropore formation in n‐silicon on substrate orientation was investigated. Samples were cut from a large crystal in various orientations between {100} and {111}. Macropores were obtained by electrochemical etching in diluted following standard techniques. The growth direction of the macropores was f…
The stochastic differential equations for a model of dissipative particle dynamics, with both total energy and total momentum conservation at every time step, are presented. The algorithm satisfies detailed balance as well as the fluctuation–dissipation theorems that ensure that the proper thermodynamic equilibrium ca…
Potassium sulfate was crystallized in a seeded batch cooling crystallizer with no temperature control or natural cooling. Above a critical seed concentration, uni-modal product of grown seeds was obtained even under a natural cooling mode with practically no nucleation. This ideal growth of seed crystals is contrary t…
The new [Ti17O24(OPri)20] cluster 1, that can be described as a non-charged lacunar super-Keggin complex, adopts a pseudo-D2d symmetry as established by X-ray diffraction and solution NMR studies.
Novel subphthalocyanines with long thioalkyl chains exhibit hexagonal columnar mesophases at room temperature; their inherent first hyperpolarizability values (β) measured by hyper-Rayleigh scattering (HRS) with fluorescence suppression are (189 ± 30) × 10–30 esu at 1300 nm.
[Ethylpyridinium][Ni(mnt) 2 ] has been prepared by electrochemical oxidation of the corresponding dianionic salt. The X-ray structure has been determined. Three different environments were observed for the paramagnetic anions with two in a stacking mode and one approximately orthogonal to the stack. The stacking showe…
A terpy-functionalised phospholipid has been incorporated into lecithin vesicles and iron(II)-directed aggregation processes have been studied.
Single crystals of complexes [{Mn(dmbpy)(N3)2}n] 1 and [{Cu(dmbpy)(N3)2}n] 2 (dmbpy = 4,4′-dimethyl-2,2′-bipyridine) were obtained from aqueous solutions containing 4,4′-dimethyl-2,2′-bipyridine, metal ions and sodium azide, and their structures determined by X-ray diffraction methods. The structure of 1 is a neutral…
A protein with a low molecular mass of 6027 was purified from cocoon shell of silkworm, Bombyx mori. Two-dimensional polyacrylamide gel electrophoresis (2D/PAGE) resolved this protein into a single spot with pI 4.3 and Mr 6000. Amino acid sequence analysis revealed that this protein consists of 55 amino acids, six of…
The photocatalytic properties of RuO2-dispersed M2Ti6O13 (M=Na, K, Rb, Cs) were investigated as to the photoexcitation ability of the hexatitanates and the role of the dispersed RuO2. An EPR signal with g=2.020, g=2.018 and g=2.004 produced by UV irradiation of the hexatitanates at 77 K had a short life time in vacuum…
Summary Electrical anisotropy in the Earth is usually a scale effect, created by averaging over structures with a preferred orientation. Homogenization theory applied to typical geological structures can help to determine the range of values to be expected in electrically anisotropic formations. The staggered-grid fin…
The thermal, morphological and conducting properties of macromolecular organic-inorganic networks synthesized by the sol-gel process and containing a wide concentration range of europium trifluoromethanesulfonate, Eu(CF 3 SO 3 ) 3 , have been investigated. The hybrid matrix, U(2000), of these materials, classed as ure…
The synthesis of two series of thiophenes substituted with crown and oligoether groups either via isolating oxaalkyl chains (2, 7-11) or in direct π-conjugation (4, 12-15) is described. Electrooxidative polymerization leads to the corresponding crown and oligoether-functionalized polythiophenes P2, P7-P11, and P4, P12…
Electronic and structural properties of TiO2 species of various sizes, charges and stoichiometries, ranging from TinOmx clusters (n=1–3, m-n=0, 1, x=-1, 0, +1) to bulk rutile and its (110) surface, have been obtained by total energy calculation based on the density functional theory (DFT), in the local density and loc…
The use of synthetic and natural biodegradable plastics has been severely limited due to their strong sensitivity to processing conditions such as temperature. The object of our research is to develop novel biodegradable thermoplastic compositions and processing methods for making plastic articles reproducibly from so…
Potassium niobophosphate glasses and glass-ceramics of the family [ x Nb 2 O 5 .(50- x ) P 2 O 5 .50K 2 O]: y Fe 2 O 3 were studied by x-ray powder diffraction, infrared and Raman scattering spectroscopy. For the potassium-phosphate samples [50P 2 O 5 -50K 2 O] the iron oxide presents a network former behaviour, for 2…