International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
Thermo-Acoustical Molecular Interaction Studies in Birnary Liquid Mixtures by Ultrasonic Velocity Measurement (Diethylamine + n-Butanol)At 303.15K A.MaryGirija1, Dr. M. M. Armstrong Arasu2,D.Devi3 Assistant Professor, Department of Physics, Cauvery college For Women Trichy-18 TN Assistant Professor, Department of Physics, St. Joseph’s College (Autonomous) Trichy-02 TN 3. Assistant Professor, Department of Physics, Cauvery college For Women Trichy -18. TN Corresponding author E-mail address: armstrongarasu@gmail.com
1. 2.
---------------------------------------------------------------**-------------------------------------------------------------Abstract -Densities, viscosities and ultrasonic velocities has been measured for the binary mixture involving Diethyl amine (1) + n-Butanol (2) at 303.15K over the entire range of mole fraction. Parameters like adiabatic compressibility(βa),inter molecular free length(Lf), relaxation time(τ), acoustical impedance(Z), bulk modulus(K), free volume(Vf ),internal pressure (πi), Gibb’s free energy(ΔG), classical absorption coefficient(α/f2 ), molar sound velocity (R) were calculated. The deviations of the liquid mixture from ideality have been explained based on the molecular interaction between unlike molecules. The behavior of these parameters with composition of the mixture has been discussed in terms of molecular interaction between the components of the liquids. Key Words: Diethylamine ,Ultrasonic velocity, Free length, adiabatic compressibility, relaxation time, molar sound velocity, internal pressure.
1. INTRODUCTION The ultrasonic study of intermolecular interactions plays an important role in the development of molecular sciences. Many researchers have undertaken these studies qualitatively through ultrasonic velocity, adiabatic compressibility and viscosity measurements for liquid mixtures binary and ternary mixtures. Ultrasonic velocity measurements are useful in the field of interactions and structural aspect studies, for characterizing the Physicochemical behavior of liquid mixtures. Ultrasonic measurements of acoustic parameters with change in mole fraction give an insight in to the molecular process. This type of study has increased in recent years due to industrial applications. In the present paper, we report density, viscosity, ultrasonic velocity for the binary system consisting of Diethylamine + n-Butanolat 303.15K and atmospheric pressure over the entire composition range. The experimental results are used to calculate adiabatic compressibility,inter molecular free length, relaxation
© 2017, IRJET
time, acoustical impedance, bulk modulus, free volume, internal pressure, Gibb’s free energy, classical absorption coefficient, molar sound velocity. These parameters are used to discuss the nature of intermolecular interaction of mixtures. So, in the present work emphasis has been placed on the determination of the parameters of the organic liquid mixtures, namely, density, and speed of sound, which are industrially important.
2. EXPERIMENTAL The binary mixtures were prepared by mass, by mixing the calculated volumes of liquid components in airtight glass bottles. In all the measurements, INSREF thermostat with a constant digital temperature display accurate to ±0.01K was used. For all the mixtures and pure solvent triplicate measurements were performed and the average of all values were considered in the calculation. The mass measurements (±0.0001g) were made using an electronic balance. The accuracy of density measurements was 0.0001g.cm-3. A set of 11 compositions were prepared for binary mixtures respectively and also their physical properties were measured. Viscosity is measured by calibrated Ostwald’s Viscometer. The speed of sound was determined using a constant frequency (2MHz) ultrasonic interferometer with an accuracy of ± 2 m.s-1.
3. THEORY The excess molar volume VE was calculated from the density data by the relationship VE = VM –Σ xiVi,
(1)
where Vi represents the molar volume, xi the mole fraction of the ith component and VM is the molar volume of the mixture, given as VM = (x1M1+x2M2)/ρm ,
| Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal |
(2)
Page 42