Materials Literature
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Official journal of the Institute of Physics - Sri Lanka. Full text articles are available. The journal also has a website at http://www.ip-sl.org/sljp/The new email for the Editor is eic.ipsl@gmail.com.
A simple hard template method has been developed to prepare uniform matchstick-like PbS nanocrystals. The approach combines functionalization of the mesoporous walls and channel surface with thioether groups, adsorption of Pb2+, and heating in an N2 atmosphere at high temperature. The structure, morphology and composi…
We report the effect of replacement of sulfur by germanium on the optical constants and some other physical parameters of chalcogenide Ge x As20S80– x (where x = 0, 5, 10, 15 and 20 at%) thin films. Increasing germanium content affected the average heat of atomization, average coordination number, number of constraint…
Well-aligned amorphous carbon nanotube (a-CNT) and porous ZnO/C core-shell nanorod (NR) arrays were fabricated for the first time by a proposed deposition-etching-evaporation (DEE) route. The arrays were prepared by deposition of carbon on the surface of well-aligned ZnO NR arrays by thermal decomposition of acetone f…
The formation of polyelectrolyte complexes is known to depend on many factors, especially pH, temperature, and ionic strength, as well as acid—base properties and mixing conditions. In an approach aimed at by-passing the complexity of blood, the formation and the stability of complexes between oppositely charged polym…
Ni nanorod arrays have been vertically grown on a Ta-coated Si substrate via an electrodeposition process through the nanopores of a porous alumina membrane. Field emission studies of the samples are performed which show a considerable low-threshold field around 5 V µm(-1). The field emission mechanism followed Fowler…
Reaction of 1,4-naphthoquinone and SNSMF(6) (M = As, Sb) in SO(2) solution in a 1 : 2 molar ratio led to the naphthoquinone fused 1,3,2-dithiazolylium salts, 3MF(6) quantitatively by multinuclear NMR (87% isolated yield of 3SbF(6)) via the cycloaddition and oxidative dehydrogenation chemistry of SNS(+) with formation…
ABSTRACT Locust bean gum was used in coating to reduce moisture loss in sausage and garlic-flavored sausage. The effects of the plasticizer species and amount on moisture loss properties of these samples were also examined. Coated and uncoated (reference) samples were stored at 5C (water activity [Aw] = 0.6351). Coate…
A density-functional approach on the hexagonal graphene lattice is developed using an exact numerical solution to the Hubbard model as the reference system. Both nearest-neighbor and up to third nearest-neighbor hoppings are considered and exchange-correlation potentials within the local density approximation are para…
The effect of redox cycles on the reducibility, structural, and electrical properties of dense pellets of ceria-zirconia solid solutions has been investigated by temperature programmed reduction studies, X-ray diffraction technique, Raman spectroscopy, and electrochemical impedance spectroscopy.Similarities and differ…
Abstract Galvanized dual phase steel sheets are used extensively in the industrial applications because of their excellent mechanical properties and superior corrosion resistance, but the segregation of alloying elements and the formation of oxides on the steel surface often have a deleterious effect on coating adhesi…
Gd-complexes of the type [Gd(L)(H(2)O)]·xH(2)O (5a-c), where L is DOTA conjugates of tranexamic acid (4a) and tranexamic esters (4b,c), have been prepared as a new class of MRI blood-pool contrast agents (BPCAs). Thermodynamic stability (K(GdL)) and pharmacokinetic inertness of 5 compare well with or better than those…
We report an original iterative method for fabricating three-dimensional mesoporous structures by independently stacking multiple self-assembled block copolymer films supported by Si membranes. A first layer is formed on the substrate by a self-assembled PS-b-PMMA (polystyrene-block-poly(methyl methacrylate)) film. A…
The nucleation of aqueous semiconductor nanocrystals (NCs) was identified by investigating the evolution of precursor solution and the subsequent N 2 H 4 -promoted growth at room temperature. Current synthesis of NCs at room temperature allowed for distinguishing the nucleation and growth processes, which were insepar…
Molecularly imprinted Au nanoparticle (NP) composites for the selective binding of the electron acceptors N,N'-dimethyl-4,4'-bipyridinium, MV(2+) (1), or bis-N-methylpyridinium-4,4'-ethylene, BPE(2+) (2), are prepared by the electropolymerization of thioaniline-functionalized Au NPs in the presence of the electron acc…
The importance of precursor structure on the activation process step was investigated for carbons derived from carbohydrates, a consistent and abundant precursor stream.Precursor ͑nonactivated͒ carbons were derived from anhydrous ␣-D-glucose precursor by pyrolysis in Ar atmosphere at temperatures ranging from 500 to 1…
Racemization-free and depolymerization-controllable poly(tetramethyl glycolide) (PTMG) was synthesized from renewable resources: D/L-lactic acids and pyruvic acid. PTMG overcomes the undesirable properties of poly(lactic acid) such as low heat-resistance and racemization causing the decrease in crystallinity. PTMG was…
Substrate inhibition by ATP is a regulatory feature of the phosphofructokinases isoenzymes from Escherichia coli (Pfk-1 and Pfk-2). Under gluconeogenic conditions, the loss of this regulation in Pfk-2 causes substrate cycling of fructose-6-phosphate (fructose-6-P) and futile consumption of ATP delaying growth. In the…
Abstract Luminescence spectroscopy and time‐resolved measurements of CdSe/ZnS quantum dots (QDs) in 20 nm thick poly(methyl methacrylate) (PMMA) films reveal radiationless energy transfer from smaller to larger QDs. As confirmed by electron microscopy, the observed effects rely on QD aggregation. This aggregation and…
Abstract The reaction of PTCDA (perylene‐3,4,9,10‐tetracarboxylic dianhydride) with an alcohol, a bromoalkane, and an alkylamine in the presence of DBU in DMF yields imido‐diester‐substituted perylenes. The reaction is limited to polar alcohols such as propanol, but longer alkyl chains are efficiently introduced in a…