Abstract
Ultrasonic investigations have been carried on the solutions of silicone rubber (SR) - nano hydroxyl apatite (n-HA) systems at an operating frequency of 2MHz. Ultrasonic velocity (v), density (ρ) and refractive index (n) have been examined for the solutions of SR (average molecular weight=1, 28,000g/mol) and those of SR- n HA in toluene and xylene. The ‘v’ value has been found to be increased with increase in concentration of SR in the solvents. For a given SR content, the ‘v’ value has been observed to be higher for toluene than xylene. The results have been interpreted in terms of closer solubility parameter values. With the addition of n-HA, the ‘v’ increases for a given SR content and solvent. This has been accounted in terms of better molecular interaction being developed in the medium with the incorporation of n-HA. Various acoustical parameters such as adiabatic compressibility, acoustic impedance, Rao's constant, van der Waals constant and space filling factor have been computed to complement the observations. The observations on SR/n-HA systems is proposed for utilization in the encapsulation of drugs, for controlled release, under ultrasound stimulation.
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