Thermodynamic properties and contact angles of CTAB and SDS in acetone–water mixtures at different temperatures

Ghimire, Yubaraj; Amatya, Sharmila Pradhan; Shah, Sujit Kumar; Bhattarai, Ajaya

doi:10.1007/s42452-020-3036-1

Cited by 19 publications

(11 citation statements)

References 37 publications

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“…This observation indicates that the concentration has reached the CMC. The CMC is the value of concentration above which micelles or aggregation of surfactant molecules are formed in the solution 32‐34 . At a higher concentration than the CMC value, the surfactants added only increases the micelles.…”

Section: Resultsmentioning

confidence: 99%

“…The CMC is the value of concentration above which micelles or aggregation of surfactant molecules are formed in the solution. [32][33][34] At a higher concentration than the CMC value, the surfactants added only increases the micelles. These micelles do not substantially affect the surface tension values and therefore the boiling heat transfer rate decreases.…”

Section: F I G U R E 3 Microscopic Photographs Of Surface (A) Optical...mentioning

confidence: 99%

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Experimental analysis of saturated pool boiling of acetone and isopropanol with added surfactant sodium lauryl sulfate over aluminum surface

2022

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The present article reports a detailed experimental study to know the effect of adding surfactants to different base fluids. For this purpose, an aqueous solution of different concentrations of surfactant with base fluids was formed and then heated at varying heat flux in a pool boiling apparatus. Acetone and isopropanol have been used as base/boiling fluids with anionic surfactant sodium lauryl sulfate (SLS) of 200, 400, 600, 800, and 1000 PPM concentration. The data obtained by heating surfactant-based fluids has been compared to the data of heating pure base fluids to establish the role of surfactants and the importance of surfactant concentration, that is, critical micelle concentration (CMC) in pool boiling augmentation. CMC value was found in the case of pool boiling of acetone with an SLS concentration of 400 PPM. However, the CMC value is found to be a lower value of SLS concentration of 200 PPM in the pool boiling process of isopropanol. Therefore, it is interesting to investigate the possible causes of such heat transfer phenomena with different values of surfactant concentration. Variations in heat flux change the degree of superheat of the aluminum heater substrate. The heat transfer performance is

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Section: Resultsmentioning

confidence: 99%

Section: F I G U R E 3 Microscopic Photographs Of Surface (A) Optical...mentioning

confidence: 99%

Experimental analysis of saturated pool boiling of acetone and isopropanol with added surfactant sodium lauryl sulfate over aluminum surface

2022

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“…In Fig. 5, SM is formed in the solution at x = 0.0 (C16TAB solution) by the SM-forming ability (CPP < 1/3) of C16TAB at 25 ºC [14], [15], [20], [21]. This ability is also maintained until 55 ºC from the DLS result, in other words, maintaining of CPP < 1/3 condition.…”

Section: E Phase Diagram and Mechanism Of Aggregate Formationmentioning

confidence: 96%

Solution Properties of Mono- and Di-hexadecyl Cationic Mixed Surfactant Systems: Specific Coexistence Effect Among Various Aggregates

Ogata

Sakurai

Takano

et al. 2022

EJCHEM

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We have synthesized the surfactant cationic dihexadecyl dimethyl ammonium bromide [16-16]. The aggregates of [16-16] and hexadecyl trimethyl ammonium bromide (C16TAB) were prepared in aqueous solution in different mixing ratio (x[16-16]) of [16-16]. The effect of mixing ratio (x[16-16]) and experimental temperature on the aggregates formation were studied using a number of physicochemical methods. With an increase in x[16-16], the structure of aggregates changed from spherical micelles to vesicles. In the range of specific ratio (0.2 ≤ x[16-16] ≤ 0.4) and temperature (35 and 45 ºC), worm-like micelles existed. We have demonstrated that x[16-16] and temperature played an important role in deciding the type of aggregate formed in solution.

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“…In regard to standard free energy of micellization of SDS in the presence of salts, the standard free energy of micellization becomes less negative in presence of K2SO4 and more negative in presence of NiSO4, indicating that micelle formation becomes less spontaneous in case of K2SO4 and more favourable in case of NiSO4. Such type of behaviour infers that micellization becomes less favourable in presence of K2SO4 and more favourable in presence of NiSO4 [18]. Table 1 also shows the values of premicellar (S1) and postmicellar slopes (S2) drawn from the graphs of specific conductance with the concentration of SDS with salts (K2SO4, NiSO4) in aqueous system.…”

Section:  (Ms/cm)mentioning

confidence: 97%

Micellization of sodium dodecyl sulphate in the presence and absence of potassium sulphate and nickel sulphate

et al. 2022

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The effect of addition of salts on the micellization of anionic surfactant sodium dodecyl sulphate (SDS) in aqueous medium has been studied by conductance measurement at 298.15 K. The critical micelle concentration (CMC) as well as thermodynamic properties was evaluated. From the premicellar and postmicellar slopes, the degree of dissociation (α) of SDS was also calculated. On adding the salts, CMC decreased whereas degree of dissociation increased. Employing these CMC and α values, the standard free energy of micellization was also evaluated. The negative values of was decreased when K2SO4 was added but increased when NiSO4 was added. BIBECHANA 19(2022)195-200

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Thermodynamic properties and contact angles of CTAB and SDS in acetone–water mixtures at different temperatures

Cited by 19 publications

References 37 publications

Experimental analysis of saturated pool boiling of acetone and isopropanol with added surfactant sodium lauryl sulfate over aluminum surface

Experimental analysis of saturated pool boiling of acetone and isopropanol with added surfactant sodium lauryl sulfate over aluminum surface

Solution Properties of Mono- and Di-hexadecyl Cationic Mixed Surfactant Systems: Specific Coexistence Effect Among Various Aggregates

Micellization of sodium dodecyl sulphate in the presence and absence of potassium sulphate and nickel sulphate

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