Effect of Addition and Molecular Size of Triglyceride Oils on Phase Behavior and Surfactant Self-Assemblies

Aramaki, Kenji; Khalid, Hossain Md.

doi:10.5650/jos.53.557

Cited by 15 publications

(14 citation statements)

References 19 publications

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“…Hence, the H 1 -I 1 transition occurs at lower C 12 EO 8 concentration, while the H 1 -L α transition occurs at higher C 12 EO 8 concentration upon the solubilization of THG. Similar observations have been reported for the water/C 12 EO 8 /TOG system [21].…”

Section: Phase Behavior Of the Water/c 12 Eo 8 /Thg And Water/c 12 Eosupporting

confidence: 90%

“…The melting temperature of the I 1 phase is around 30 • C in the presence of 6 wt% THG, and it increases with increasing oil content and reaches up to 34 • C at 9.5 wt% of THG, indicating that the I 1 phase is stabilized against temperature upon the solubilization of THG. A similar thermal stabilization effect for the I 1 phase has also been observed in another system [21]. In the case of poly(oxyethylene)-type nonionic surfactants, the spontaneous curvature of the surfactant layer decreases with increased temperature, resulting in micellar growth attributed to the dehydration of the EO chain [27].…”

Section: Phase Behavior Of the Water/c 12 Eo 8 /Thg System As A Functsupporting

confidence: 71%

“…It is reported that if oil molecules are solubilized into the palisade layer of the aggregates, then the cross-sectional area tends to be expanded and the curvature becomes negative or less positive [2]. It is also found in the literature that the addition of oil induces I 1 phase formation with less hydrophilic surfactant, which does not happen in the aqueous binary system [3,21,24]. Present results indicate that we could control the formation of the I 1 phase by tuning the molecular weight or the penetration tendency of the oil, as depicted in Fig.…”

Section: Penetration Tendency Of Different Oils In H 1 and L α Liquidmentioning

confidence: 95%

“…In the second part, the degree of oil distribution into different solubilization sites in the aggregates has been quantitatively discussed with different-molecular-weight triglycerides. Results are also compared with those reported for the 1,2,3-trioctanoylglycerol (TOG) system [21].…”

Section: Introductionmentioning

confidence: 93%

“…5, comparison is done for the solubilizing tendency of the TBG and THG systems with the TOG system [21] at different water/surfactant ratios (water/C 12 EO 8 = 40/60 and 28/72).…”

Section: Penetration Tendency Of Different Oils In H 1 and L α Liquidmentioning

confidence: 99%

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Solubilization of triglycerides in liquid crystals of nonionic surfactant

Alam

Varade

Aramaki

2008

Journal of Colloid and Interface Science

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Section: Phase Behavior Of the Water/c 12 Eo 8 /Thg And Water/c 12 Eosupporting

confidence: 90%

Section: Phase Behavior Of the Water/c 12 Eo 8 /Thg System As A Functsupporting

confidence: 71%

Section: Penetration Tendency Of Different Oils In H 1 and L α Liquidmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 93%

“…5, comparison is done for the solubilizing tendency of the TBG and THG systems with the TOG system [21] at different water/surfactant ratios (water/C 12 EO 8 = 40/60 and 28/72).…”

Section: Penetration Tendency Of Different Oils In H 1 and L α Liquidmentioning

confidence: 99%

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Solubilization of triglycerides in liquid crystals of nonionic surfactant

Alam

Varade

Aramaki

2008

Journal of Colloid and Interface Science

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Effects of Surfactant Hydrophilicity on the Oil Solubilization and Rheological Behavior of a Nonionic Hexagonal Phase

Alam

Matsumoto

Aramaki

2013

J Surfact & Detergents

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The effects of surfactant hydrophilicity on the phase behavior and rheology of a hexagonal phase (H 1 ) and related O/H 1 emulsions in a water/C 12 EO n /isohexadecane system (n = 7, 9) have been investigated. In this phase behavior study, a variety of surfactant aggregates (micellar, W m ; hexagonal, H 1 ; bicontinuous cubic, V 1 ; lamellar, L a ; inverse micellar, O m ) have been observed in water-C 12 EO n binary systems. The oil solubility of different surfactant aggregates was strongly affected by the surfactant hydrophilicity, i.e., surfactant aggregates in the C 12 EO 7 system could solubilize a larger amount of oil than those in the C 12 EO 9 system. It can be inferred that the surfactant with long hydrophilic head groups could be closely packed in the interface, leading to a reduction in the oil solubility in the micellar core due to the strong head group interaction. Interestingly, the rheology of the H 1 phase also exhibits behavior that is dependent on the surfactant hydrophilicity, i.e., high values of the elastic modulus G 0 and complex viscosity |g*| have been observed in the C 12 EO 9 system, possibly due to the strong neighboring head group interaction. Hexagon structure of the H 1 phase was calculated by using the Bohlin model. The viscosity of the O/H 1 emulsions decreases with increasing oil concentration, possibly due to the low volume fraction of the continuous phase (the H 1 phase).

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