Role of medium-chain alcohols in interfacial films of nonionic microemulsions

Strey, R.; Jonströmer, Mikael

doi:10.1021/j100190a075

Cited by 75 publications

(41 citation statements)

References 6 publications

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“…Alcohols are known to act as cosurfactants (14). Alcohols with short or medium chain length were therefore added to the oil phase to improve the solubilization of water in jojoba oil and of jojoba oil in the aqueous phase.…”

Section: Effect Of Surfactants On Formation Of Jojoba Oil Microemulsimentioning

confidence: 99%

Formation and investigation of microemulsions based on jojoba oil and nonionic surfactants

Shevachman

Shani

Garti

2004

J Americ Oil Chem Soc

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The properties of jojoba oil make it uniquely suited as a raw material for the cosmetics industry. Water-based, thermodynamically stable preparations of jojoba oil are essential in many formulations. New microemulsions were prepared based on jojoba oil and different nonionic surfactants, namely polyoxyethylene-(ethylene oxide) 10 -oleyl alcohol (Brij 96V) and ethoxylated sorbitan esters (Tweens). The effects of the surfactants and of primary alcohols as cosurfactants on the isotropic regions of the phase diagram were elucidated. It was found that, up to a certain cosurfactant chain length, the isotropic region expanded considerably as chain length increased. The size of the isotropic region also increased as a function of the ethylene glycol content of the aqueous phase in microemulsions based on ethoxylated alcohol but shrank when ethylene glycol was included in microemulsions prepared with ethoxylated sorbitan esters. Secondary structural phase transitions from water-in-oil to bicontinuous and to oil-in-water structures (as determined by measuring conductivity and viscosity) were found to be related to jojoba oil content. Dynamic light scattering and small angle X-ray scattering studies established that incorporation of jojoba oil into Brij 96V micelles caused micellar transformation from elongated to spherical droplets and a decrease in the aggregation number.Jojoba liquid wax (also called jojoba oil) is a stable, highly lipophilic, non-toxic "oily" material obtained from the seeds of the desert plant jojoba (Simmondsia chinensis) (Fig. 1). This unique oil differs from common vegetable oils and animal fats in that it is composed mainly (97%) of linear long-chain esters, which are characteristic components of waxes. More than 80% of these are esters of C 18 -, C 20 -, C 22 -, and C 24 -chain monounsaturated alcohols and acids (1).Jojoba wax resists oxidation even at elevated temperatures and can remain chemically unchanged for years. Owing to its excellent ability to penetrate the skin and high resistance to oxidation, jojoba wax is widely used as a component in cosmetics. Its derivatives have potential applications in a variety of commercial fields, including pharmaceuticals and lubrication (1). Numerous recent studies have demonstrated the feasibility of incorporating jojoba as an oil phase in formulas containing active compounds to enhance the efficacy of topical drugs (2,3).The growing interest in microemulsions (ME) for cosmetic and pharmaceutical applications is linked to their physicochemical properties-thermodynamic stability, spontaneous formation, clear appearance, low viscosity, and high solubilization capacity (4). A particularly attractive possibility is that of using ME to enhance the efficacy of molecularly solubilized, hydrophobic, biologically active compounds by providing a readily controlled, stable medium for the solubilized components, together, perhaps, with protection against degradative reactions (5).The use of alcohols as cosurfactants in the preparation of ME has a long history. Alcoho...

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Section: Effect Of Surfactants On Formation Of Jojoba Oil Microemulsimentioning

confidence: 99%

Formation and investigation of microemulsions based on jojoba oil and nonionic surfactants

Shevachman

Shani

Garti

2004

J Americ Oil Chem Soc

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show abstract

“…Considerable debate has occurred as to whether the alcohol enhances oil solubilization in microemulsions by acting as a cosurfactant or as a cosolvent (6,9,10). Oil solubilization is linearly related to surfactant micelle concentration (11,12).…”

Section: Introductionmentioning

confidence: 99%

Effect of Interfacial Alcohol Concentrations on Oil Solubilization by Sodium Dodecyl Sulfate Micelles

Zhou

Rhue²

2000

Journal of Colloid and Interface Science

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“…To avoid the unwanted effect of salt (salting out), it can be overcome by adding highly effective surface active molecules possessing an amphiphilic nature. Furthermore, most commercial ionic surfactants are not balanced with respect to their affinity to water and oil, which can be made so by addition of an alkyl chain alcohol as a cosurfactant, which interposes itself between surfactant molecules [61]. Basically, the alcohol head group, being nonionic serves to lessen the electrostatic interactions with the neighbouring charged surfactant head group which results in reduction of the charge density on aggregate micellar surface and the optimal area per head group [62][63][64][65].…”

Section: Effect On the Phase Behaviourmentioning

confidence: 99%

Using spin polarised positive muons for studying guest molecule partitioning in soft matter structures

Martyniak

Dilger

Scheuermann

et al. 2006

Phys. Chem. Chem. Phys.

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Role of medium-chain alcohols in interfacial films of nonionic microemulsions

Cited by 75 publications

References 6 publications

Formation and investigation of microemulsions based on jojoba oil and nonionic surfactants

Formation and investigation of microemulsions based on jojoba oil and nonionic surfactants

Effect of Interfacial Alcohol Concentrations on Oil Solubilization by Sodium Dodecyl Sulfate Micelles

Using spin polarised positive muons for studying guest molecule partitioning in soft matter structures

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