Materials Literature
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Luminescent Y2O2S : Eu3+ nanoceramics having an average particle size of 20 nm has been prepared through a gel–polymer thermolysis process employing a urea–formaldehyde resin. In this nanocrystalline system, large blue shifts (in relation to the bulk system) of ∼5000 cm−1 and ∼2000 cm−1 in the photoluminescence excita…
A surfactant-assisted one-step synthesis route was developed, leading to the formation of a very high surface area (600 m2 g−1) of zirconia and unprecedented hierarchical meso-macroporous structure with wormhole-like mesoporous walls and a novel, uniform assembly of macropores ranging in size from 300 to 500 nm.
Stable silver coated gold hydrosols, with particle size varying from 12–200 nm, were prepared and tested as a substrate for surface enhanced Raman scattering (SERS). Nanoparticles containing a 12 nm gold core and coated with a silver shell varying from 0–100 nm were prepared. It is shown that SERS sensitivity depends…
Five sodium aluminosilicate glasses in the series Na 2 O: xAl 2 O 3 ,:(3-x) SiO 2 and Na 2 0:Al 2 O 3 :ySiO 2 were prepared and subjected to leaching at pH 2 under ambient conditions for up to 1000 h. Solid- state nuclear magnetic resonance (NMR) spectroscopy revealed the identity of aluminate and silicate environment…
New ordered nanoporous carbon materials can be synthesized using pitch and mesoporous silica materials as the carbon precursor and template, respectively. In this case, the silica material (type MCM-48 and SBA-15) is impregnated with pitch and further carbonized. After removal of the silica by acid treatment, a graphi…
The orientation-controlled LDH crystals on Si substrates were intercalated by dicarboxylate ions to give the anisotropic layer expansion.
During emersion, diatoms are exposed to sunlight (with UVB) on tidal flats, where the salinity may increase as a result of evaporation. In order to investigate whether a combination of UV radiation and desiccation would cause oxidative stress under such conditions, an experiment has been carried out with the diatom Cy…
The magnetocaloric effects (MCEs) in cubic NaZn13-type La(FexSi1−x)13 compounds and their hydrides composed of icosahedral clusters have been investigated because these compounds exhibit the itinerant-electron metamagnetic (IEM) transition just above the Curie temperature Tc: The value of Tc can be increased continuou…
A long afterglow phosphor, was prepared and studied. It exhibits a broad-band emission in the deep blue with a persistence time longer than 10 h. The ions occupy three distinct sites in this material, and the emission and excitation spectra from ions in these sites have been identified. The thermoluminescence spectra…
Chitosan, a natural polysaccharide that has excellent biocompatibility and biodegradability, can be used as nerve conduit material. The purpose of this work was to study the ability of chitosan and some chitosan-derived materials to facilitate nerve cell attachment, differentiation and growth. The biomaterials studied…
CdSe quantum dots with polymerisable ligands have been incorporated into polystyrene beads, via a suspension polymerisation reaction, as a first step towards the optical encoding of solid supports for application in solid phase organic chemistry.
Hydrogen environment embrittlement (HEE) of type 316 series austenitic stainless steels was investigated in the temperature range from 300 to 80 K. Hydrogen showed a marked effect on the tensile properties of type 316, 316L and 316LN stainless steels. HEE increased with decreasing temperature, reached a maximum at aro…
The roles played by the conformational disordering of alkyl chains in determining the aggregation states of matter are reviewed for liquid crystalline materials from a thermodynamic perspective. Entropy, which is one of the most macroscopic concepts but which has a clear microscopic meaning, provides crucial microscop…
Water vapor is present in most environments in which alloys are used at elevated temperatures and there are papers in the literature that show water vapor usually has adverse effects on the oxidation resistance of alloys. However, the exact effect of water vapor is dependent on the particular alloy under consideration…
A new approach to the one-step synthesis of cadmium selenide (CdSe) quantum dots is reported using the air stable complex cadmium imino-bis(diisopropylphosphine selenide); the ligand is readily prepared from elemental selenium and the precursor, quantum dots of comparable quality to those prepared by conventional meth…
The synthesis and characterization of polysiloxane substituted metal-free and lead phthalocyanines are described. These materials form a class of isotropic liquid phthalocyanines that combine a large nonlinear absorption with an exceptionally large nonlinear thermal refractive effect. These materials effectively coupl…
Abstract In previous work, zein was plasticized with oleic acid to obtain flexible films. However, it was observed that film properties were affected by the preparation method employed. Our objective was to investigate the effect of processing methods on thermal behavior of zein films by differential scanning calorime…
Soluble, chromophore-functionalized SWNTs (SWNT-NA) have been synthesized via covalent bonding with minimal alteration to the characteristic one-dimensional electronic states of SWNTs. The key step in the molecular design includes incorporating a naphthalimide fluorescent moiety onto SWNTs via the amidation of oxidati…
Solid oxide fuel cells (SOFC) with samaria-doped ceria (SDC) electrolytes were prepared with anodes made from either Cu, ceria, and SDC or Au, ceria, and SDC. These cells were tested in H 2 and n -butane fuels at 650°C. The similarity of performance ( V I ) curves and impedance results for cells made with Au and Cu…
In a typical one-pot synthesis procedure, hybrid organosilica fibers were grown by templating the co-condensation between TEOS and selected organotrialkoxysilanes (20 mol% of phenyltriethoxysilane, PTES, or aminopropyltriethoxysilane, APTES) through the use of DDOA (2,3-bis(n-decyloxy)anthracene) and DUOP (2,3-bis(n-u…