Volume : 2, Issue : 12, December - 2013

Study of the Effect of Molecular Size and Shape in Molecular Interaction of Binary Liquid Mixture Using Viscosity Method

Chandana Basu, Nishamol Kanat

Abstract :

Viscosity is a measure of fluid behaviour. An ideal solution in the usual sense should show no change in volume on mixing. Therefore, expected ideal behaviour, the fluidities should be additive. Viscosity depends on free volume. Change in free volume depends on the type of interaction between the constituents. Generally excess thermodynamic functions have been used as a qualitative or quantitative guide to predict the extent of complex formation in a binary liquid mixture. In present study a series of aliphatic alcohols namely ethanol, n–propanol, n– butanol, n–pentanol, isopropyl alcohol and isoamyl alcohol are chosen as one component of binary mixture. Other components of the binary mixture are either one of these n–heptane, cyclohexane, toluene and xylene. Viscosity studies of these mixtures in a range of 0–100% composition are done. There is always a negative deviation in viscosity. The result indicates that the size and shape play important role in interaction