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Influences of diols and nonionic hydrotrope on the aggregation and physico-chemical properties of sodium dodecyl sulfate and polyvinyl alcohol mixture at numerous experimental temperatures
Influences of diols and nonionic hydrotrope on the aggregation and physico-chemical properties of sodium dodecyl sulfate and polyvinyl alcohol mixture at numerous experimental temperatures
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Date
2023
Authors
Md. Habibur Rahman, Javed Masood Khan, K.M. Anis-Ul-Haque, Kamrul Hasan, Md. Tuhinur R. Joy, Dileep Kumar, Anis Ahmad, Shahed Rana,Md. Anamul Hoque, Mohammad Majibur Rahman.
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Abstract
"This study investigates the interaction between sodium dodecyl sulfate (SDS) and polyvinyl alcohol (PVA) in the
presence of additives (ethylene glycol (EG), propylene glycol (PG), 2,3-butanediol (2,3-BD), and resorcinol). The
critical micelle concentration (CMC) of the surfactant system was estimated by using the conductometric tech nique. The influence of temperature, concentration, and additive composition on the physicochemical variables
(CMC, micelle ionization (α) and counter ion binding (β)) were also investigated. The observed variation in CMC
was attributed to several factors, such as the concentration of additives, the nature of hydrophobicity, and the
magnitude of the dielectric constant of the mixed solvents. The CMC of the SDS + PVA mixed system was
increased with increasing temperature due to the dominance of hydrophobic hydration over the hydrophilic one.
The evaluation of thermodynamic parameters, such as change in standard Gibbs free energy (ΔGo
m), enthalpy
(ΔHo
m), and entropy (ΔSo
m) and the estimation of β value for the SDS + PVA mixed system indicate the feasibility
and viability of the micelle formation. The negative values of ΔGo
m observed within the temperature range of
298.15 to 323.15 K suggest a favorable condition for the formation of surfactant micelle. The that the binding
forces in the SDS + PVA mixed system are hydrophobic and ion–dipole interactions in nature. The investigation
of the intrinsic enthalpy (ΔH0,*
m ) determines the stability of the surfactant system, while the compensation
temperature (Tc) serves as an indicator of the solute-solvent interaction."
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Keywords
Surfactant,
Polymer,
Diols,
Temperature,
Composition,
Thermodynamic properties