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ABSTRACT The importance of liquid mixtures rather than single component liquid system[1,2], has gained much importance during the last two decades in assessing the nature of molecular interaction and investigation of liquid mixtures consisting of polar and non-polar components is of considerable importance in understanding inter molecular interaction between the component molecules and they find applications in several industrial and technological process [3-5]. Such studies as a function of concentration are useful in gaining insight into the stracture and bonding of associated molecular components and other molecular processes. The measurement of ultrasonic speed and parameters derived from it has been used in understanding the nature of intermolecular interaction in liquid mixtures[6-11]. Though a number of investigations were carried out in mixtures having acetonitrile as one of the components[12-13], binary system with triethylamine as one of the component at constant frequency are scarcely reported. As triethylamine is a secondary ether it is used as a solvent for resins, waxes, oils, dyes and surface coatings. The acoustic parameters for binary liquid mixture namely acetonitrile - triethylamine has been determined at four different temperatures. The excess acoustical parameters such as excess ultrasonic velocity (UE), excess viscosity (ƞE), excess adiabatic compressibility (βaE), excess intermolecular free length (LfE), excess free volume (VfE) and excess acoustic impedance (ZE) has been computed using values of ultrasonic velocity and density. The extent of interaction existing between component molecules has been found out in acetonitrile and triethylamine system. The interaction parameters values have been out to be negative suggesting the presence of dipole- dipole interaction with increase in temperature. Keywords: Binary mixture, ultrasonic velocity, adiabatic compressibility, intermolecular free length, and acoustic impedance Reference: ( J D Pandey and A K Sukla J. Pure Appl. Ultrason. 15 537 (1993)  Riyazuddeen and Nurul Islam J. Pure Appl. Ultrason. 15 537 (1993)  S L Oswal, P Oswal and R P Phalak J. Sol. Chem. 27 507 (1998)  J Rajasekhar and P R Naidu J. Chem. Engg. Data 41 373 (1996)  G Arul and L Palaniappan Indian J. Pure Appl. Phys. 39 561 (2001)  A Pal, H Kumar, B R Arbad and A B Tekale Indian J. Pure Appl. Phys. 41 113 (2003)  Thirumaran S., Jayalakshmi K, Archives of applied science Research, 2009, 1(2), 24-31.  Ikhe Shashikant A, Narwade M L, Indian J. Chem., 2005, 44A, 1203.  Palani R, Sarvanan S, Geetha A, Asian J. of Chem., 2007, 19 No – 7, 5113.  Thiyagarajan R, Palaniappan L, Indian J. Pure & Appl. Phys, 2008, 46, 852.  Ali A, Hyder S, Nain A K, Indian Journal physics, 2000, 74B(1), 63.  Fort R J, Moore W R, Trans Faraday Soc., 1962, 61, 2102.  Pal Amalendu, Hash Kumar B R, Takal A B, Indian J. Pure & Appl. Physics, 2003, 41, 113.
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