Materials Literature
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Novel photochromic spiropyrans (SPPs) containing 6 ′ ‐hydroxy group were synthesized and their spectral properties as well as abilities for complexation with metal ions studied. In solutions they exist as equilibrium mixture of spirocyclic (A) and merocyanine (B) isomers. The largest content of merocyanine form was fo…
This investigation enumerates the synthesis and mesomorphic properties of 1,2,3‐triazole containing azobenzene liquid crystals. In these liquid crystals the methylene chain length at non polar end was varied from six to ten carbons to investigate the association properties of non polar chain on the melt. The compound…
The main objective of the present work is to study the effect of mixing of hair fiber on mechanical properties of fly ash. The hair fiber was mixed in fractions of 0.00, 1.00, 1.50, 2.00 & 2.50% respectively. Portland cement production is under critical review due to high amount of carbon dioxide gas released to the a…
Following extended use in organic chemistry, microwave-assisted synthesis is gaining more importance in the field of inorganic chemistry, especially for the synthesis of nanoporous materials. It offers some major advantages such as a significant shortening of the synthesis time and an improved promotion of nucleation.…
Nano-grained BaTiO3 ceramics were prepared using a two-step sintering process. The level of shrinkage and specific surface of the BaTiO3 green bodies were measured as a function of temperature. The two temperatures at which boundary diffusion and lattice diffusion begin to dominate were estimated by measuring the shri…
Os polímeros derivados do petróleo são amplamente utilizados devido à sua versatilidade, propriedades mecânicas e custo relativamente baixo, mas causam impacto ambiental como conseqüência da grande quantidade de resíduos lançados ao meio ambiente. Os problemas gerados pelo descarte de plásticos de origem petroquímica…
Transparent capacitors were prepared using BMN films grown from 25 to on AIZO/glass substrates (Corning 1737) by pulsed laser deposition. The BMN films grown at on the AIZO electrode exhibit a stable interface state between BMN and AIZO electrodes and the lowest root mean square roughness of 1 nm. The Pt/200 nm thick…
Recent investigations from our laboratory have described compelling experimental evidences that the use of a central 4-methyl-3,5-diacylaminophenyl platform functionalized with two lateral aromatic rings each bearing three appended aliphatic chains is well-suited to produce liquid crystalline materials, some of which…
High-spin alignment for dicationic, tricationic, tetracationic and hexacationic species of a meta-para-linked oligoarylamine was accomplished by incorporating cyclophane skeletons into the oligomer backbone.
A new complex material system, Mg(NH3)nCl2–nLiBH4 (here n can be 1, 2 and 6), in which the MgCl2 works as ammonia carrier but plays a crucial role in promoting the interaction between LiBH4 and NH3 to release hydrogen at temperature below 100 °C, is reported.
Two series of bent-shaped molecules have been synthesized and their supramolecular self-organization at variable temperature has been studied. The majority of these bent-compounds form liquid crystalline phases and the mesomorphic behaviour of them has been fully characterized by polarised optical microscopy, calorime…
Well-ordered Ag nanoparticle arrays with high particle density were fabricated by photochemical reduction of domain-selective Ag(+)-loading on hydrophobic polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) self-assembled diblock copolymer templates.
Few methods currently exist for controlling vesicle-vesicle adhesion. We now report a new system, based upon a multivalent guest and an amphiphilic receptor with a photo-isomerisable anchor that can be incorporated into lipid vesicles of different sizes. Large unilamellar vesicles containing our receptor were found to…
Heterogeneous chiral catalysts based on the DIOP-Rh system were prepared by covalent immobilization onto SBA type silicas using two different strategies. In the first route, a chiral analogue of Wilkinson's catalyst, [Rh(diop)(PPh2(CH2)2Si(OCH2CH3)3)Cl], 2, was immobilized onto a SBA-15 surface via a classical post-gr…
The radionuclide inventory of a copper beam dump from the 590 MeV proton accelerator of the Paul Scherrer Institute in Switzerland was determined, focusing on radioisotopes with half-lives of more than 60 d, and in particular, of long-lived isotopes with T 1/2 =10 4 −10 7 years, which are important regarding radioacti…
Tin-doped zinc oxide, , films were prepared using a pulsed laser deposition method to elucidate the effects of Sn doping in ZnO films. The film obtained was ⟨001⟩-oriented wurtzite type when the Sn concentration was 10% or less, while ⟨111⟩-oriented was the major phase when the Sn concentration was more than 10%. The…
Tissue-engineered blood vessel substitutes should closely resemble native vessels in terms of structure, composition, mechanical properties, and function. Successful cardiovascular tissue engineering requires optimization of in vitro culture environment that would produce functional constructs. The extracellular matri…
A general model for explaining bistability in crystals of donor–acceptor (DA) molecules, associated with an intramolecular charge-transfer process, is thoroughly discussed. Specifically, an extension from the two- to the three-essential states model for D-bridge-A molecular units taking into account the active role of…
Dendrites and rectangular prisms of orthorhombic CaTiO3 were synthesized massively by reacting titanium tetraisopropoxide with Ca(OH)2 in basic solutions at 120 °C. Dendrites were formed in dilute base solution with moderate stirring while rectangular prisms were formed in concentrated base solution or with vigorous s…
Electrospray ionisation mass spectrometry shows that arylstibonic acids, RSbO(3)H(2), give rise to oxo-bridged clusters derived from [H(8)(RSb)(12)O(28)] which act as inorganic crown ligands towards Na(+) cations; structure determination of one derivative revealed a cage-like anion [Na(2)H(9)(p-O(2)NC(6)H(4)Sb)(12)O(3…