Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: ULTRASONIC STUDY OF THE SELF–ASSOCIATION OF ANILINE IN ETHANOL-CYCLOHEXANE MIXTURES | Journal of Physical Science Vol. 18 2 81-88 2007 81 ULTRASONIC STUDY OF THE SELF-ASSOCIATION OF ANILINE IN ETHANOL-CYCLOHEXANE MIXTURES R. Thiyagarajan1 Mohamad Suhaimi Jaafar2 and L. Palaniappan2 department of Physics Annamalai University Annamalainagar 608 002 Tamil Nadu India 2School of Physics Universiti Sains Malaysia 11800 USM Pulau Pinang Malaysia. Corresponding author lp_dde_au@ Abstract Sound velocity U density p and viscosity n values have been measured at 303 K in the ternary system of aniline methanol cyclohexane. From these data acoustical parameters such as adiabatic compressibility P free length Lf free volume Vf and internal pressurefxj have been estimated using the standard relations. The results are interpreted in terms of molecular interaction between the components of the mixtures. Observed excess value in the mixture indicates the existence of dipole-induced dipole and dipole-dipole interactions in the system. Keywords ultrasonic velocity ternary system molecular interactions 1. INTRODUCTION The understanding of intermolecular interactions between polar and non-polar component molecules can be best made by ultrasonic investigations and they find applications in several industrial and technological 2 Muhuri and co-workers3 have evaluated the apparent molar volume and apparent molar compressibilities of tetraalkyl ammonium borates in 1 2-dimethoxyethane using sound velocity measurements and the presence of solute-solute and solutesolvent interactions were predicted in the system. Jayakumar et have studied the molecular association and absorption on the electrolytic solutions of copper sulphate and nickel sulphate in water. They concluded the existence of solute-solvent interactions between the components of the system. Amalendu Pal et have made an attempt to study the speed of sound and isentropic compressibilities of mixtures containing polyethers and ethyl acetate at K and they .
