The surface tension and surface potential of aqueous solutions of normal aliphatic alcohols |
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| Affiliation: | 1. The Department of Colloid Science, Cambridge, England;2. School of Applied Chemistry, New South Wales University of Technology, Sydney, Australia;1. Physico-Chemical Laboratory, Department of Chemistry, Acharya Nagarjuna University, Guntur 522510, AP, India;2. V.R.Siddhartha College of Engineering, Vijayawada, AP, India;1. Physics Department, Graduate School of Natural and Applied Sciences, Dokuz Eylül University, 35390 İzmir, Turkey;2. Physics Department, Faculty of Science, Dokuz Eylül University, 35390 İzmir, Turkey;3. Physics Department, Faculty of Science, Cumhuriyet University, 58140 Sivas, Turkey;4. Science Teaching Department, Faculty of Education, Cumhuriyet University, 58140 Sivas, Turkey;1. SCSVMV University, Department of Mathematics, Kanchipuram-631561, India;2. SCSVMV University, Director (Research & Publications), Kanchipuram-631561, India;3. SCSVMV University, Department of Physics, Kanchipuram-631561, India |
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| Abstract: | Surface tension and surface potential measurements have been made as functions of concentration and temperature for a homologous series of normal aliphatic alcohols. The results are fitted to a two-dimensional equation of state and the surface tension measurements are checked for consistency with the corresponding surface potential results. From the temperature dependence of the surface tension the quantities ΔH0. ΔS0, and ΔG0 for the adsorption process are calculated. These results are correlated with corresponding solution thermodynamics. The molecular configuration in the surface has been tentatively deduced. The surface phase more closely resembles the bulk solution than the vapor. The negative entropy of adsorption from the vapor is very large and it is suggested that the additional factors responsible for the high values are changes in internal degrees of freedom of the hydrocarbon portion of the molecule, and “cluster” formation in the water in the immediate neighborhood of the solute molecule. |
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