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<p style="text-align: justify;"><span lang="EN-GB">Physicochemical studies on effect of additives on clouding behavior and thermodynamics of polyoxyethylene (20) sorbitan monooleate</span></p>

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Title Statement <p style="text-align: justify;"><span lang="EN-GB">Physicochemical studies on effect of additives on clouding behavior and thermodynamics of polyoxyethylene (20) sorbitan monooleate</span></p>
 
Added Entry - Uncontrolled Name Hoque, Md. Anamul; Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
Mitu, Attikunahar ; Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
Patoary, Mohammad-Omar Faruk; Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
Islam, D. M. Shafiqul; Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
 
Uncontrolled Index Term Cloud point, Tween-80, Surfactants, Hydrophobic interactions, Thermodynamic parameters
 
Summary, etc. <p style="text-align: justify;"><span lang="EN-GB">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, Na<sub>2</sub>SO<sub>4</sub>; sodium nitrate, NaNO<sub>3</sub>) 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<sup>-1</sup>) in reducing CP values were found to be in the order: Na<sub>2</sub>SO<sub>4</sub><em> </em>˃<em> </em>NaCl ˃ NaNO<sub>3</sub><em>. </em>The CP values of Tween-80 solutions also decrease with increasing concentrations of polymers used. The values of ∆<em>G</em><sup>0</sup><sub>c</sub> are positive in all the cases, indicating the non-spontaneous nature of clouding. ∆<em>H</em><sup>0</sup><sub>c</sub> and ∆<em>S</em><sup>0</sup><sub>c</sub> 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 ∆<em>H</em><sup>0</sup><sub>c</sub> and ∆<em>S</em><sup>0</sup><sub>c</sub> decrease with increasing concentrations of salts and polymers.</span></p>
 
Publication, Distribution, Etc. Indian Journal of Chemistry -Section A (IJCA)
2021-07-02 10:20:01
 
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http://op.niscair.res.in/index.php/IJCA/article/view/10836
 
Data Source Entry Indian Journal of Chemistry -Section A (IJCA); ##issue.vol## 55, ##issue.no## 7 (2016): INDIAN JOURNAL OF CHEMISTRY - SECTION A
 
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Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJCA/article/download/10836/35254
http://op.niscair.res.in/index.php/IJCA/article/download/10836/35255
http://op.niscair.res.in/index.php/IJCA/article/download/10836/35256
 
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