Physicochemical investigations of microemulsification of eucalyptus oil and water using mixed surfactants (AOT+Brij-35) and butanol

Mitra, Rajib Kumar; Paul, Bidyut K.

doi:10.1016/j.jcis.2004.09.015

Cited by 74 publications

(45 citation statements)

References 72 publications

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“…DE cond values were calculated from the slopes and presented as a function of water volume fraction for the microemulsions in Table 2. Similar behaviors of DE cond were reported [44][45][46][47]. As shown in Table 2, for the ethoxylated mono-di-glyceride contents 0.25 and 0.75, the increase in the water content from 0.11 to 0.21 increases the activation energy of conduction flow indicating that discrete droplets separated by the oil phase are present and no percolation is occurring.…”

Section: Resultssupporting

confidence: 81%

Microemulsions with Mixed Nonionic Surfactants and Flavor Oil

Fanun

2010

J Surfact & Detergents

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The microemulsion systems composed of water/sucrose laurate/ethoxylated mono-di-glyceride/peppermint oil were formulated and characterized using electrical conductivity and small-angle X-ray scattering. The solubilization capacity of water in the oil is dependent on the surfactant mixing ratio. A static percolation phenomenon was observed in these systems and the water volume fraction percolation threshold was determined. A progressive transformation of water-in-oil to bicontinuous microemulsions, occurring upon dilution with water was revealed for equal amounts of sucrose laurate and ethoxylated mono-di-glyceride in the microemulsions. The periodicity, that is a characteristic length for the domain size of the microemulsions, increases linearly with the increase in the water volume fraction, whereas the correlation length, that is also a characteristic length for the domain size, increases with the increase in the water volume fraction up to a certain value then decreases.

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Section: Resultssupporting

confidence: 81%

Microemulsions with Mixed Nonionic Surfactants and Flavor Oil

Fanun

2010

J Surfact & Detergents

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“…For the system studied viscosity increases with increase in 7 (wt% of aqueous phase). The microemulsion system thus, shows a structural change from oil continuous system to water continuous, which has higher viscosities than the former (41). The plots of h (dynamic viscosity) and d 2 d 2 reflect that the transition occurs at õ25% weight fraction of aqueous phase (Fig.…”

Section: Viscosity Measurementsmentioning

confidence: 83%

Incorporation of Antitubercular Drug Isoniazid in Pharmaceutically Accepted Microemulsion: Effect on Microstructure and Physical Parameters

2007

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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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Physicochemical investigations of microemulsification of eucalyptus oil and water using mixed surfactants (AOT+Brij-35) and butanol

Cited by 74 publications

References 72 publications

Microemulsions with Mixed Nonionic Surfactants and Flavor Oil

Microemulsions with Mixed Nonionic Surfactants and Flavor Oil

Incorporation of Antitubercular Drug Isoniazid in Pharmaceutically Accepted Microemulsion: Effect on Microstructure and Physical Parameters

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

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