8.
ABSTRACTAcoustic properties of aqueous solution of AgNO
3 at various concentrations, in presence of Tannic Acid at a fixed concentration (1 × 10
?4 M/L) are studied by ultrasonic method. Tannic acid, a compound derived from plant extracts, is used as the reducing and stabilizing agent to synthesize Ag-NPs and also enables variation of the mean size of Ag-NPs by taking a suitable concentration ratio of AgNO
3 and Tannic acid in distilled water. Ag-NPs are synthesized at room temperature and further stabilized with the aid of sonication. The temperature dependence of acoustic properties is studied and discussed in this paper. Acoustic properties were measured using multi-frequency nano fluid interferometer. It is found that there is a systematic increase in ultrasonic velocity upto 60
oC for almost all the concentrations studied and thereafter its value decreases, while this velocity decreases with increasing concentration of AgNO
3 in solution at higher concentrations only. This study is important to find optimum concentration required for a particular application. The present result will be useful as data for various applications.
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