Abstract
Thermodynamic parameters of liquid ethoxylated sorbitan ester (Tween 20, 40, 60 and 80) surfactants have been evaluated. For the estimation of these parameters, molar volumes (V) and volume expansion coefficients (α) at different temperatures are employed. These dilatometric studies are predominantly directed towards the establishment of the invariant nature of Sharma’s parameter (S 0). The S 0 and all other parameters values are used to discuss and throw light on the internal structure, molecular order, molecular packing, molecular movement and intermolecular interactions.
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Authors are thankful to the UGC, New Delhi and to the heads of the respective institutions for their financial assistance, help, cooperation and encouragement.
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Sannaningannavar, F.M., Patil, S.N., Melavanki, R.M. et al. Thermodynamic Parameters and their Dependence on Temperature in the Range 298–353 K for Ethoxylated Sorbitan Ester Tween 20, 40, 60 and 80 Surfactants. J Surfact Deterg 18, 495–504 (2015). https://doi.org/10.1007/s11743-015-1669-7
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DOI: https://doi.org/10.1007/s11743-015-1669-7