Materials Literature
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The reduction of tetrachloroaurate with sodium borohydride in the presence of 2,2′:6′,2″-terpyridyloctanethiol gave terpyridine-functionalized gold nanoparticles (Tpy–Au, core size 2.0 nm). Metal complexation of Tpy–Au with ruthenium-terpyridyl trichloride, Ru(tpy)Cl3, led to new gold nanoparticles bearing the rutheni…
The high surface area porous nickel, obtained by template electrodeposition using a hexagonal liquid crystalline phase medium as a template was evaluated as a potential material for electrochemical capacitors using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) studies in 6 M KOH. A single el…
High-pressure low-density polyethylene (HLDPE)/organic functionalized SiO2 nanocomposites were synthesized using melt-blending technique in a sigma internal mixer. The properties of the nanocomposites were studied using two different organic functional modifiers: diglycidyl ether of bisphenol-A (DGEBA) and triacetoxyv…
A novel bifunctional mesoporous material MA/SBA-15 has been synthesized in one pot by in situ introduction of aluminium and magnesium salts and controlling the synthesis conditions, with the framework insertion of aluminium and high dispersion of magnesia resulting in both the strong basic and acidic sites being simul…
Magnetic properties of a novel ferromagnetic semiconductor (Zn, Cr)Te were investigated. Zn1–xCrxTe thin films, both without and with the additional hole doping by nitrogen, were grown by molecular beam epitaxy. In the magnetization measurement on Zn1–xCrxTe without carrier doping, the ferromagnetic behaviors such as…
In this present work, we propose and demonstrate a resonant structure that solves two major problems related to the split-ring resonator structure. One of the problems related to the split-ring resonator structure is the bianisotropy, and the other problem is the electric coupling to the magnetic resonance of the spli…
The interaction between gold in the 0, i, ii and iii oxidation states and the zinc-terminated ZnO(0001) surface is studied via the QM/MM electronic embedding method using density functional theory. The surface sites considered are the vacant zinc interstitial surface site (VZISS) and the bulk-terminated island site (B…
An experimental demonstration of transparency in the epsilon-negative (ENG) and mu-negative (MNG) pair using the composite right/left-handed transmission line (CRLH-TL) is presented. An eight-cell 1D microstrip transmission-line structure consisting of a ladder network of four CRLH unit cells with MNG characteristics…
A series of Co doped lanthanum silicate apatite-type phases, La9.83Si4.5Co1.5O26, La9.66Si5CoO26, La10Si5CoO26.5 and La8BaCoSi6O26, have been synthesised, and neutron diffraction, EXAFS and XANES used to investigate their structures in detail. All compositions were shown to possess the hexagonal apatite structure, and…
We study Onsager's free energy functional for nematic liquid crystals with an orientation parameter on a unit circle. For a class of interaction potentials we obtain explicit expressions for all critical points, analyze their stability, and construct the corresponding bifurcation diagram. We also derive asymptotic exp…
Highly crystalline and almost monodisperse spinel cobalt-ferrite nanocrystals are synthesized in a one step process, which has very high coercivity at 10 K and exhibits superparamagnetic behaviour at 300 K.
Aluminium borophosphate gels and glasses with different compositions are prepared, for the first time, via the sol–gel process using aluminium lactate, boric acid and phosphoric acid as precursors. This glass-forming range is significantly wider than that accessible via the melt cooling route. The route from the solut…
The primary products and the rate of the reaction of methyl radicals with oxygen atoms in the gas phase at room temperature have been studied using three different experimental arrangements: (A) laser flash photolysis to produce CH3 and O from the precursors CH3I and SO2 (the educts and the products were detected by q…
The preparation of supramolecular hydrogels containing various inorganic acids and salts using L-lysine-based hydrogelators is conducted and their thermal stabilities, gel strengths, FT-IR spectra, and electron micrographs are measured. These hydrogelators can form supramolecular hydrogels over a wide pH range and con…
Supercritical fluid extrusion (SCFX) is a recent technological development for production of expanded starch-based foams in which formation of a microcellular structure is achieved by injection of supercritical CO2 into the melt. The high effective diffusivity of CO2 in the porous matrix favors escape of the gas to th…
Powder X-ray diffraction experiments have been performed to analyse the structural order in alkylene bridged silsesquioxanes. These organic–inorganic hybrids were obtained by the hydrolysis–condensation of a series of six α,ω-bis[triethoxysilyl(propyl)ureido]alkylenes associating hydrophobic alkylene units with variou…
Flurbiprofen-nicotinamide solid dispersions were prepared by the fusion method. The solid dispersions were evaluated for dissolution rate. The drug-carrier interaction in the liquid and solid states were studied by using phase solubility analysis, phase diagram, X-ray diffraction (XRD), and differential scanning calor…
Octatosylamido-substituted metal-free, Ni(II) and Zn(II) phthalocyanines (pcs, 3a–c) have been synthesized from 4,5-dicyano-N,N’-ditosyl-o-phenylenediamine (2, tosyl: toluene-p-sulfonyl) in the presence of an anhydrous metal salt and a strong base. The new compounds have been characterized by elemental analysis, IR an…
We have synthesized highly birefringent liquid-crystalline polymers (LCPs) containing an azobenzene group directly connected to a tolane moiety (P3ATm), in which the alkyl spacer length (CH2)m was varied as m = 6, 9 and 12. All LCPs showed a nematic phase in a broad temperature range (>170 °C). The homogeneously align…
Upon complexation with 4,4[prime or minute]-bipyridine, a cyclic dimer of a fused porphyrin zinc complex, having two pi-electronically coupled binding sites, shows a strong negative cooperativity in the second guest binding, to allow stepwise formation of 1 : 1 and 1 : 2 inclusion complexes.