Materials Literature
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The dimensional and mechanical stability of materials is of paramount importance to their use in the everyday world where they may encounter a wide variation in temperature through design or by accident. Many polymers are processed at elevated temperatures so as to enable them to flow and be more amenable to fabricati…
2-Hydroxyl-1-naphthaldehyde has been utilized as a fluorigenic reagent for the determination of four aminoglycoside antibiotics namely: neomycin, tobramycin, amikacin and kanamycin, in pure form, in some pharmaceutical preparations and in biological fluids. The method is based on the reaction of the reagent with amino…
Ordered Ni-Cu alloy nanowire arrays embedded in the hexagonally ordered nanochannels of anodic alumina membranes (AAMs) were fabricated by electrodeposition. The x-ray diffraction, x-ray energy dispersion spectrum, scanning and transmission electron microscopy were utilized to characterize the Ni-Cu alloy nanowire arr…
Mechanical measurements, x-ray investigations, and optical microscopy are employed to characterize the interplay of chemical composition, network topology, and elastic response of smectic liquid crystalline elastomers (LCEs) in various mesophases. Macroscopically ordered elastomer films of submicrometer thicknesses we…
Radical additions of HPR2 (R = Et, Cy) onto alkenyl groups or nucleophilic substitution reactions on chlorosilanes by LiCH2PR2 (R = Me, Hex) are used to prepare first and second-generation alkylphosphine-containing dendrimers based on a polyhedral oligomeric silsesquioxane (POSS) core. The first generation dendrimers…
Transport property and mixed former effect studies on a new fast Ag+ ion conducting glass system: 0.7[0.75AgI : 0.25AgCl] : 0.3 [Ag2O : { xB2O3 : (1-x)MoO3} ], R C Agrawal, M L Verma, R K Gupta, R Kumar
Using hydrothermal techniques, two new compounds—strontium borate SrBO2(OH) and barium polyborate Ba3B6O9(OH)6—have been prepared. The structures of the title compounds were solved by single-crystal X-ray diffraction analysis. In the structure of SrBO2(OH), the Sr2+ ion is surrounded by eight oxygen atoms and the bora…
The cationic polymerizations of isobutylene (IB) initiated by the H 2 O/TiCl 4 in dichloromethane (CH 2 Cl 2 ) at −30 °C were carried out in the absence and presence of various external electron pair donors (EDs). Controlled polymerization with a slow polymerization rate and a narrow molecular weight distribution (MWD…
Nanosized copper oxide–zirconia particles containing 10–30 mol% of copper were prepared by using a precipitation technique in aqueous tetramethylammonium hydroxide solutions. Two methods, in situ (INS) and step-by-step (SBS), which differed in the time when the copper salt was introduced to the synthesis procedure, we…
A well ordered 2D-hexagonal mesoporous niobium and tantalum (Nb ∶ Ta = 1 ∶ 1) mixed oxide (denoted mesoporous NbTa oxide) was successfully prepared. Pore size, pore volume and wall thickness of the mesoporous NbTa oxide were found to be strongly affected by the amounts of water and metal sources in a starting ethanol…
We propose an optical technique, based on dynamic light scattering, for investigating the local rheological response of a complex fluid over a frequency range larger than that provided by standard mechanical instrumentation. The low-coherence radiation used in a fiber optics configuration allows the measurements to be…
The coil-globule transition has been studied for A-B copolymer chains both by means of lattice Monte Carlo (MC) simulations using bond fluctuation algorithm and by a numerical self-consistent-field (SCF) method. Copolymer chains of fixed length with A and B monomeric units with regular, random, and specially designed…
Heat capacity $(C)$, magnetic torque, and proton NMR relaxation rate $({1/T}_{1})$ measurements were performed on Fe6:Li single crystals in order to study the crossings between $S\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ and $S\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1$ and between $S\phantom{\ru…
Thermally stable, mesoporous, and microporous zirconium-doped silica were prepared via supramolecular templating under low pH conditions. Zirconium loadings of up to 20 wt % were successfully incorporated into the porous silica-based framework, giving materials with very high surface areas, uniform pore sizes, and por…
We have prepared neodymium(III) and ytterbium(III) complexes from a range of poly(pyrazolyl)borate ligands and studied their near-IR luminescence properties, in particular using solution lifetimes obtained in protonated and deuterated methanol to determine the extent of solvation of the complexes. For the neodymium co…
The first heavily substituted triphenylenophthalocyanines have been synthesised and found to be mesogenic.
The mode-coupling theory for ideal glass transitions in simple systems is generalized to a theory for the glassy dynamics of molecular liquids using the density fluctuations of the sites of the molecule's constituent atoms as the basic structure variables. The theory is applied to calculate the liquid-glass phase diag…
The synthesis of benzylpenicilloyl-containing dendrimers has been achieved by a convenient procedure involving quantitative functionalization of the terminal amino groups of the three Starbust PAMAM generations used (G(n); n = 0, 1, 2). All these densely penicilloylated dendrimers (G(n)P) exhibit similar, simple NMR s…
The polymorphism of 2,2-dichloropropane ((CH 3 ) 2 CCl 2 ) has been further investigated by both thermal and X-ray powder diffraction experiments. From the former the phase transitions between the different phases have been characterized at normal pressure as well as at high pressures (up to 200 MPa). From the p − T s…
Three new sulfides Li2CdSnS4 (1), Na2CdSnS4 (2) and Na6CdSn4S12 (3), have been synthesized using a molten flux of alkali-metal polysulfides and structurally characterized by single crystal X-ray diffraction studies. Both the layered compound 1 and the three-dimensional compound 2 have tetrahedral anionic frameworks of…