Materials Literature
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In this article, we have developed models for threading dislocation (TD) reduction due to the introduction of an intentionally strained layer. Three different types of dislocations have been considered in this model: misfit dislocations (MDs), mobile TDs, and TDs whose glide motion has been blocked by a MD crossing th…
The goal of this feature article is to introduce the dimension ‘magnetic anisotropy’ in the field of molecule-based magnets. For that, we have focused on three cyano-bridged MnIIMoIII compounds synthesized from the [MoIII(CN)7]4– precursor. The pentagonal bipyramid structure of this precursor is not compatible with a…
Micelle templating and co-condensation of tetraethoxysilane and 3-(2,4-dinitrophenylamino)propyl-triethoxysilane in the presence of hexadecyltrimethyl-ammonium bromide has been used to synthesize transparent yellow thin films and monoliths of organic dye-functionalized MCM-41 silica: these hierarchical materials consi…
The optical effect upon insertion of hydrogen into Pd-coated magnesium lanthanide switchable mirrors is investigated in terms of the changes of their complex refractive indices. A significant change in the optical constants of LnMg layers is seen between the as-deposited state and the dehydrided state after one cycle.…
Broad-band dielectric spectroscopy is employed to study the molecular dynamics of (dielectrically active) glass-forming liquids which are confined to (dielectrically inactive) zeolites and nanoporous glasses. For the H-bond-forming liquid ethylene glycol (EG) embedded in zeolites of different sizes and topologies one…
A new oxidation catalyst containing perruthenate immobilised within MCM-41 has been prepared and used in the clean oxidation of alcohols to carbonyl compounds with molecular oxygen.
Materials containing highly accessible and well ordered titanium sites prepared by grafting titanocene on ITQ-2 material are excellent catalysts for epoxidation of olefins, yielding high conversions and selectivities to the desired epoxides.
Reactions of [H2N(CH2)3]8Si8O12 or its octahydrochloride salt with a variety of electrophiles, including anhydrides, lactones, acid chlorides, α,β-unsaturated esters and isocyanates, afforded functionalized R8Si8O12 frameworks in good to excellent yields. Practical methods for the synthesis of [HO(CH2)3]8Si8O12, [OCN(…
Nanocrystalline SrTiO 3 was prepared by a stearic acid sol-gel technique. X-ray measurements showed that the sample obtained is of good quality and the grain sizes range from 26 to 120 nm. One blue photoluminescence (PL) band at around 470 nm was observed at room temperature. Investigation of the dependence of the vis…
A quantitative thermal conductivity measurement technique, the method, is applied in a scanning thermal microscope (SThM) with a resistive probe for the determination of thermal properties with a high spatial resolution in the nanometre range. With this set-up the quantitative thermal conductivity of materials can be…
Thermal and mechanical behavior of ZnO varistors used in surge arresters is simulated for current pulses of various magnitude and duration. Time dependence of the temperature profile and of the distribution of thermal stresses is computed by solving heat transfer equations for varistor disks with nonuniform electrical…
Titanium silasesquioxane complexes have been prepared as models for the catalytically active centres in titanium silicate oxidation catalysts. Complexes [TiL(R7Si7O12)] [R = c-C6H11, L = CH2Ph 5, NMe2 6, OSiMe3 7, OPri 8 or OBut 9; R = c-C5H9, L = CH2Ph 13 or OPri 14] were prepared from the reactions of incompletely c…
From an engineering point of view, the skin and subcutaneous tissue represent an integrated load-transmitting structure. It is subjected to intrinsic and environmental influences. An attempt to use a four-layered model is offered to explain how the integument withstands and transmits loads through deforming appropriat…
Photochromic 1′,3′,3′-trimethyl-6,8-dinitro-spiro- [2H-1-benzopyran-2,2-indoline], (6,8-dinitro BIPS) has been studied in different solvents using 1H-NMR techniques, UV/visible spectroscopy, X-ray diffraction and electrospray ionisation mass spectroscopy (ESI-MS). Molar decadic absorption coefficients for 6,8-dinitro…
Crystallization of CaCO3 in the presence of poly(amidoamine) (PAMAM) dendrimer containing carboxylate groups at the external surface resulted in the formation of spherical vaterite crystals whereas rhombohedral calcite crystals were formed in the absence of additive.
Two new metal–oxo supported transition metal complexes, [{M(phen)2}2(Mo8O26) (M = Ni or Co; phen = 1,10-phenanthroline) are synthesized by a hydrothermal method and characterized by X-ray crystallography, showing that the octamolybdate possesses a novel unprecedented structure and that [M(phen)2]2+ units are covalentl…
We discuss theoretical and experimental aspects of the array formation of nano-colloids in two-dimensional (2D) situations. In particular, we treat metal nanocrystals which have been passivated by surfactant monolayers and then deposited on the free surface of water. Their self-organization properties follow from the…
Fructose 1,6-bisphosphate aldolase catalyzes the reversible cleavage of fructose 1,6-bisphosphate and fructose 1-phosphate to dihydroxyacetone phosphate and either glyceraldehyde 3-phosphate or glyceraldehyde, respectively. Catalysis involves the formation of a Schiff's base intermediate formed at the epsilon-amino gr…
Transformation temperatures and mechanical properties such as transformation stresses at different temperatures, superelasticity characteristics, and load cycling behavior have been investigated in NiTiCu orthodontic archwires with various copper concentrations. The results have been compared with the conventional NiT…
A D4-symmetric chiral dioxoruthenium(VI) porphyrin can effect stoichiometric and catalytic enantioselective hydroxylation of benzylic C–H bonds to give enantioenriched aryl alcohols, the highest ee of 76% being attained in the catalytic oxidation of 4-ethyltoluene with 2,6-dichloropyridine N-oxide as terminal oxidant;…