Phase behavior, interfacial composition and thermodynamic properties of mixed surfactant (CTAB and Brij-58) derived w/o microemulsions with 1-butanol and 1-pentanol as cosurfactants and n-heptane and n-decane as oils

Mitra, Rajib Kumar; Paul, Bidyut K.; Moulik, Satya P.

doi:10.1016/j.jcis.2006.04.011

Cited by 60 publications

(75 citation statements)

References 45 publications

(67 reference statements)

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“…Most of the recent studies in anionic-nonionic lEs have concentrated on the description of the properties of these mixtures, in particular their high solubilization capacity, but they have not furthered our understanding of the phase behavior of mixed anionic-nonionic lEs [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

The HLD‐NAC Model for Mixtures of Ionic and Nonionic Surfactants

Acosta

Bhakta

2008

J Surfact & Detergents

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The HLD-NAC model has been used as an ''equation of state'' to predict the properties of microemulsion (lE) systems formulated with either anionic or nonionic surfactants. The model uses the concept of the hydrophilic-lipophilic difference (HLD) to calculate the chemical potential difference of transferring a surfactant from the oil to the aqueous phase; as a function of formulation variables such as type of surfactant, oil, temperature, electrolyte concentration. The value of HLD is used as a scaling parameter to calculate the net and average curvatures (NAC) of the surfactant at the water/oil interface. These curvatures determine the phase volumes, phase transitions, and solubilization capacity of lEs. In this work, the HLD-NAC model is extended to nonideal surfactant mixtures of anionic and nonionic surfactants. The phase behavior of limonene lEs formulated with binary mixtures of sodium dihexyl sulfosuccinate with nonionic nonylphenol ethoxylates and alcohol ethoxylates was used to determine the deviations of the HLD from the ideal mixing behavior. The deviations were fitted using a 2-parameters Margules equation. The results suggests that the deviations in anionic-rich systems are due to the charge shielding effect of nonionic surfactants, and in nonionicrich systems, the deviations seem to be explained by the increase in hydration of the surfactant headgroups due to the presence of anionic surfactants. When these corrections were used to predict the curvature of dioctyl sulfosuccinate-dodecyl pentaethylene glycol-heptane lEs, the HLD-NAC model corrected for the nonidealities reproduced not only the trends but also the actual range of values reported in the literature.

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Section: Introductionmentioning

confidence: 99%

The HLD‐NAC Model for Mixtures of Ionic and Nonionic Surfactants

Acosta

Bhakta

2008

J Surfact & Detergents

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“…The concentrations of cosurfactant at the interface and in the bulk oil phase were estimated to get the distribution constant (K d ) by the dilution experiments in the light of the physicochemical rationale elaborated by Moulik and Hait [43], Bayrak [44], Mitra et al [45] and Zheng et al [39]. The total number of moles of the cosurfactant, n a present in the stable microemulsion is given by Eq.…”

Section: Theoretical Premise and Mathematical Model Dilution Experimementioning

confidence: 99%

“…For the first time, Mitra et al [45] employed cationic CTAB and polyoxyethylene (20) cetyl ether (Brij-58)-derived microemulsions in the presence of 1-butanol (Bu) or 1-pentanol (Pn) as the cosurfactant and n-heptane (Hp) or n-decane (Dc) as oil under varied conditions of temperature and mixing ratios of the surfactants. The distribution of cosurfactants (Bu or Pn) between the interface and bulk oil at the threshold level of stability, and the energetics of the cosurfactant transfer process were evaluated.…”

Section: Findings Analysis and Interpretation Dilution Study With Simentioning

confidence: 99%

The Schulman Method of Cosurfactant Titration of the Oil/Water Interface (Dilution Method): A Review on a Well‐Known Powerful Technique in Interfacial Science for Characterization of Water‐in‐Oil Microemulsions

Bardhan

Kundu

Chakraborty

et al. 2015

J Surfact & Detergents

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Microemulsions are thermodynamically stable, isotropic transparent mixtures of two immiscible liquids (polar and nonpolar) and amphiphile(s) (usually surfactant and/or cosurfactant). The cosurfactant plays an important role by blending with surfactants, and partitioned between the coexisting aqueous and oleic phases to control the bending elasticity of the interfacial layer to render stability to the dispersion. The microheterogeneity of such dispersions makes them useful in biological and technological applications. Various techniques viz., conductance, interfacial tension, SANS etc. were applied to estimate the distribution of cosurfactant between the interface and the bulk oil. However, a simple but ingenious method comprising repetitively oil dilution with cosurfactant titration till attainment of stable microemulsions was also used to measure the distribution of cosurfactant. This review summarizes formation and characterization of water-in-oil microemulsions stabilized by single or mixed surfactants of different charge types and polar head groups or mixed surface active ionic liquid and surfactant, and cosurfactants of different lipophilicities in both hydrocarbons and long chain alkyl ester oil, emphasizing interfacial composition, thermodynamics of formation and structural parameters by the dilution method coupled with transport properties, microstructures and states of water organization inside the pool etc. using instrumental techniques. Applicability of the data obtained from dilution method in different areas, viz. nanomaterial synthesis, enzyme activity, etc. have been reported. Indeed, this article presented a journey of development and significant contribution in utilizing this elegant and inexpensive method to accomplish the formation of microemulsion through consistent motivation by researchers of different countries.

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“…In this study, therefore, the effect of the transfer ratio on the interval of the oscillatory behavior was investigated by obtaining the spectrum without 1-butanol. The absence of 1-butanol led to a decrease in the miscibility of the CTA + from the donor phase into the organic membrane phase, 34 and thus the transfer ratio of CTA + toward the membrane/acceptor interface was expected to decrease. Figure 4 presents the time-resolved interfacial tension of the two interfaces and the electric potential in the absence of 1-butanol.…”

Section: Contribution Of the Solutes To The Interval Of The Oscillatomentioning

confidence: 99%

Spontaneous Oscillation Mechanism by Simultaneous Time-resolved Measurements of Interfacial Tensions of Both the Donor/Membrane and Membrane/Acceptor Phases

et al. 2014

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Phase behavior, interfacial composition and thermodynamic properties of mixed surfactant (CTAB and Brij-58) derived w/o microemulsions with 1-butanol and 1-pentanol as cosurfactants and n-heptane and n-decane as oils

Cited by 60 publications

References 45 publications

The HLD‐NAC Model for Mixtures of Ionic and Nonionic Surfactants

The HLD‐NAC Model for Mixtures of Ionic and Nonionic Surfactants

The Schulman Method of Cosurfactant Titration of the Oil/Water Interface (Dilution Method): A Review on a Well‐Known Powerful Technique in Interfacial Science for Characterization of Water‐in‐Oil Microemulsions

Spontaneous Oscillation Mechanism by Simultaneous Time-resolved Measurements of Interfacial Tensions of Both the Donor/Membrane and Membrane/Acceptor Phases

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