A comparative study of Critical Micelle Concentration (CMC) and Free Energy of Micellization of cationic surfactant and anionic surfactant in different composition of methanol-water mixed solvent media by conductometric method at 308.15 K

Shah, Sujit Kumar; Niraula, Tulsi P; Bhattarai, Ajaya; Chattarjee, Sujit Kumar

doi:10.3126/bibechana.v8i0.4883

Cited by 5 publications

(4 citation statements)

References 26 publications

(28 reference statements)

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“…In consequence the local concentration of alcohol around the monomers of surfactant becomes larger than the bulk solvation of the surfactant molecules by the hydrophobic part of the organic solvent and lead to the delay micellization. 24 It was shown in literature that in this concentration (20 wt % or x EtOH = 0.1) the number of hydrogen-bonds per water molecule is maximum. 25 It means that the structure of water is the most stable, the hydrophobic interaction between ethanol molecules and the local water molecules are very strong so the hydrophobic hydration of surfactants monomers is the least effective.…”

Section: Resultsmentioning

confidence: 90%

“…What is more, breaking of water molecules by molecules of alcohol would facilitate interaction between the hydrophobic part of the surfactant molecule and the hydrophobic part of the ethanol. In consequence the local concentration of alcohol around the monomers of surfactant becomes larger than the bulk solvation of the surfactant molecules by the hydrophobic part of the organic solvent and lead to the delay micellization . It was shown in literature that in this concentration (20 wt % or x EtOH = 0.1) the number of hydrogen-bonds per water molecule is maximum .…”

Section: Resultsmentioning

confidence: 99%

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Application of Conductance Study to Analyze Micellization Behavior of Cationic Gemini Surfactants in Water and Water–Ethanol Solvent Mixed Media

et al. 2016

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The paper presents the analysis of micellization behavior of cationic gemini surfactants with similar structures with varying atom number in spacer: heptylene-1,7-bis-(dimethyloctylammonium) bromide (8−7−8) and octylene-1,8bis(dimethyloctylammonium) bromide (8−8−8) in water and water−ethanol solvent mixed media. Experiments were carried out by using conductometric method within the temperature range of 288.15−323.15 K. The values of micellization parameters and thermodynamic functions of aggregation [critical micelle concentration (cmc), the degree of dissociation of micelles (α), enthalpy of micellization (ΔH m o ), entropy of micellization (ΔS m o ), Gibbs free energy of micellization (ΔG m o ] within the temperature range investigated were determined. Based on the investigations performed it has been shown that the systems containing the additives ethanol have a positive value ΔG trans o , a more positive value ΔG mo , and a higher value of α and cmc as compared to pure water what confirms that the micellization process is delayed. The less spontaneous micellization behavior was observed for the surfactant with odd number of carbon atoms in spacer: 8−7−8. In this case the value of cmc was higher than the nearest homologues with even number of carbon atoms in spacer (8−8−8 and 8− 6−8 surfactants). At higher temperatures, the differences in aggregation behavior became less visible.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Application of Conductance Study to Analyze Micellization Behavior of Cationic Gemini Surfactants in Water and Water–Ethanol Solvent Mixed Media

et al. 2016

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“…Shah et al [3] measured the specific conductivity of cationic surfactant (Dodecyltrimethylammonium Bromide) and anionic surfactant (Sodiumdodecyl Sulphate) in methanol-water mixed solvent media containing 0.1, 0.2 and 0.3 volume fractions of methanol at 308.15 K. The specific conductivities of Dodecyltrimethylammonium Bromide and Sodiumdodecyl Sulphate were increased with increment in concentration and decreased with increment in the volume fractions of methanol. Also, the critical micelle concentration (cmc) was increased with increment in volume fraction of methanol in case of both surfactants.…”

Section: Electrical Conductivitymentioning

confidence: 99%

Investigation on solution properties of surfactants in mixed solvent media: Landmark towards Surface Chemistry in Eastern Nepal

Bhattarai

2014

BIBECHANA

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Surfactants are amphiphilic molecules having a hydrophilic or water soluble moiety (head group) and a hydrophobic, or water insoluble moiety (tail group). Surfactants are not only related to soaps and detergents, they are also in heavy demand for industrial processes requiring colloid stability, metal treatments, mineral flotation, pesticides, oil production, pharmaceutical formulation, emulsion polymerization, particle growth and many more. That is why surfactants have been and continue to be a very active area of scientific research and commercial growth for several decades. One interesting property of surfactants is that at low concentrations, they exist solely as monomers. The formation of micelles, begins at a specific surfactant concentration termed the critical micelle concentration (cmc), where the physical properties of the solution, such as interfacial tension, electrical conductivity, and light scattering behaviour, often changes abruptly due to the existence of micelles. The formation of micelles will be able to calculate various thermodynamic parameters. These parameters make surfactants not only an interesting and rich area for the exploration of novel phenomena but also an area of research which can lead to new applications in a variety of fields. However, most of the previous studies on surfactants are limited to aqueous media only. Studies in mixed solvent media are very natural one as one can modulate the conformations of surfactants and their interactions easily by simply varying the composition of the media. With this concept, the research team of Eastern Nepal has started to work the solution properties of surfactants in different mixed solvent media in presence and absence of salts and has also investigated cationic and anionic surfactant interaction in mixed solvent media. DOI: http://dx.doi.org/10.3126/bibechana.v11i0.10400 BIBECHANA 11(1) (2014) 175-180

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“…In our previous article [30], thermodynamic investigations of DTAB and CTAB have been already published. is article describes the tensiometric approach to CTAB in mixed solvent media.…”

Section: Introductionmentioning

confidence: 99%

Interfacial and Micellization Behavior of Cetyltrimethylammonium Bromide (CTAB) in Water and Methanol-Water Mixture at 298.15 to 323.15 K

Shah

Bhattarai

2020

Journal of Chemistry

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The micellization behavior of cetyltrimethylammonium bromide (CTAB) in water , 0.1, 0.2, 0.3, and 0.4 volume fractions of methanol at 298.15, 308.15, 318.15, and 323.15 K were investigated by surface tension measurements. The effect of methanol on values of critical micelle concentration (cmc), free energies of micellization ΔGmo, and surface properties viz. maximum surface excess concentration Γmax, area occupied by per surfactant molecule Amin, surface pressure πcmc, solution surface tension γcmc, solvent surface tension (γo), free energies of adsorption ΔGadso, the efficiency of adsorption (pC20), effective Gibbs free energy ΔGeffo, and free energy of surface at equilibrium (Gmin) were investigated using surface tension values. Other parameters such as the packing parameter (P), aggregation number (N), concentration of surfactant in the bulk phase (C20), relation between Amin and πcmc, and correlation of slopes dγ/d log C, γo/γcmc, Γ/Γmax, cmc/C20, ΔGadso/ΔGmo, and cmc/pC20 with the volume fraction of methanol are calculated and discussed in the light of the experiment done.

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A comparative study of Critical Micelle Concentration (CMC) and Free Energy of Micellization of cationic surfactant and anionic surfactant in different composition of methanol-water mixed solvent media by conductometric method at 308.15 K

Cited by 5 publications

References 26 publications

Application of Conductance Study to Analyze Micellization Behavior of Cationic Gemini Surfactants in Water and Water–Ethanol Solvent Mixed Media

Application of Conductance Study to Analyze Micellization Behavior of Cationic Gemini Surfactants in Water and Water–Ethanol Solvent Mixed Media

Investigation on solution properties of surfactants in mixed solvent media: Landmark towards Surface Chemistry in Eastern Nepal

Interfacial and Micellization Behavior of Cetyltrimethylammonium Bromide (CTAB) in Water and Methanol-Water Mixture at 298.15 to 323.15 K

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