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Title: Physicochemical studies on effect of additives on clouding behavior and thermodynamics of polyoxyethylene (20) sorbitan monooleate
Authors: Hoque, Md. Anamul
Mitu, Attikunahar
Patoary, Mohammad-Omar-Faruk
Islam, D M Shafiqul
Keywords: Cloud point;Tween-80;Surfactants;Hydrophobic interactions;Thermodynamic parameters
Issue Date: Jul-2016
Abstract: Cloud point (CP) of nonionic surfactant, namely polyoxyethylene (20) sorbitan monooleate (Tween-80) in aqueous environment and in the presence of different additives such as salts (sodium chloride, NaCl; sodium sulfate, Na2SO4; sodium nitrate, NaNO3) and polymers (polyvinylpyrrolidone, PVP; polyvinyl alcohol, PVA; polyethylene glycol, PEG) have been studied. The CP values of Tween-80 in aqueous medium are found to decrease with increase of surfactant concentration. The CP values of Tween-80 are lower in magnitude in the presence of sodium salts as compared to those in aqueous medium; the effect of sodium salts (between 0.1 and 10 mmol L-1) in reducing CP values were found to be in the order: Na2SO4 ˃ NaCl ˃ NaNO3. The CP values of Tween-80 solutions also decrease with increasing concentrations of polymers used. The values of ∆G0c are positive in all the cases, indicating the non-spontaneous nature of clouding. ∆H0c and ∆S0c values were found to be almost negative in the presence of salts and polymers, except in the case of the PEG-water system. The negative values of ∆H0c and ∆S0c decrease with increasing concentrations of salts and polymers.
Page(s): 793-802
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.55A(07) [July 2016]

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