Published Paper Details:

Ultrasonic speeds and isentropic compressibilities of aqueous solutions of Water + 2-methoxyethanol (2ME) + t-butanol have been determined at 298.15 K. The concentrations of t-butanol at which ultrasonic speed becomes maximum and isentropic compressibility becomes minimum are found to decrease with increase in the concentration of 2ME in the cosolvent (Aqueous 2ME). This behaviour indicates that the aqueous ternary solutions are less structured than aqueous t-butanol. This behaviour is also well reflected in the concentration dependence of excess ultrasonic speed and excess isentropic compressibility. This behaviour is explained as due to a decrease in the ability of t-butanol to form clathrate hydrates owing to the presence of 2ME. When the concentration of 2ME in the cosolvent (x2ME) > 0.11, ultrasonic speed decreases and isentropic compressibility increases with concentration of t-butanol indicating that the ternary solution behaving as normal solution where in any further addition of 2ME or t-butanol leads to destabilization of the hydrogen bonded structure of water and t-butanol looses its ability to form clathrate hydrates in aqueous solutions.