Ultrasonic velocity and absorption studies on different phthalates

Self-Contacts, Self-Concentration, and the Composition Dependence of the Glass Transition Temperature in Polymer Mixtures

“…The q parameter in the Kwei equation was originally introduced to account for specific interactions. In this regard, the phthalates are known to associate in solution, presumably as a result of dipole attractions between the ester groups, so that a nonzero value of q would seem to be justified for these systems. There are other factors that could come into play, however.…”

Study of Internal Pressure and Related Parameters in Ternary Liquid Mixtures Using Ultrasonic Velocity Measurement

“…Number of studies on the thermodynamic properties of ternary mixtures has increased in recent years due to industrial applications [1][2][3][4][5]. A third component added to a mixture of two immiscible components brings about the phenomenon in certain ternary liquid mixtures has been studied earlier [6][7][8][9] by observing on the distribution of molecules of one component between the other two components and the formation of hitherto unknown compounds from a study of the change in free volume, molar volume, internal pressure and other thermodynamic parameters.…”

“…Internal pressure has been a subject of active interest among several researchers during recent past [7][8][9][10]. Several attempts have been made by a number of investigators [11][12][13][14][15] to calculate the internal pressure of liquids and liquid mixtures theoretically.…”

Simultaneously measuring concentrations of a model drug and a model excipient in solution using ultrasonic spectrometry

“…Ultrasonic spectrometry (often named spectroscopy) in liquids has increasingly become an important tool for basic and applied research in many scientific fields such as physics, physical chemistry, material sciences, biology, and medicine [4][5][6][7]. The two major parameters measured in ultrasonic spectrometry are the velocity and the attenuation of the waves.…”