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A nanocomposite consisting of lead sulfide (PbS) nanoparticles (NPs) with average diameter of 26 Ǻ, according to absorption threshold shift, and polyvinyl alcohol (PVA) was characterized using far-infrared absorption spectroscopy. The experimental results are consistent with theoretical calculations that include proper mechanical boundary conditions at the nanocrystal-host interface.

Discusses the influence of Fe2O3-filler on the thermal properties of polystyrene. Achievement of the X-ray diffraction spectrum of the PS-Fe2O3 filled polymer using Philips PW 1710 diffractometer; Thermogravimetric analysis; Differential scanning calorimetry measurements; Chemical bonding between the PS matrix and the Fe2O3; Thermal decomposition of the filled polymer.

The formation of the complex between alendronate, non-chromophoric bisphosphonate drug important for the treatment of a variety of bone diseases, and iron(III) chloride in perchloric acid solution was studied. The stoichiometric ratio of alendronate to Fe(III) ions in the chromophoric complex was determined to be 1:1. The conditional stability constant was logK'(ave)=4.50(SD=0.15), indicating that the Fe(III)-alendronate complex is a complex of medium stability. The optimum conditions for this reaction were ascertained and a spectrophotometric method was developed for the determination of alendronate in the concentration range 8.1-162.5 microg ml(-1), the detection limit being 2 microg ml(-1). The method was validated for the direct determination of alendronate in tablet dosage formulations.