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Smart Nonaqueous Foams from Lipid-Based Oleogel

Abstract : Oil foams are composed of gas bubbles dispersedin an oil phase. These systems are scarcely studied despite theirgreat potential in diverse fields such as the food and cosmeticindustries. Contrary to aqueous foams, the production of oilfoams is difficult to achieve due to the inefficiency of surfactantadsorption at oil−air interfaces. Herein, we report a simple way toproduce oil foams from oleogels, whose liquid phase is a mixtureof sunflower oil and fatty alcohols. The temperature at which theoleogel formed was found to depend on both fatty alcohol chainlength and concentration. The air bubbles in the oleogel foamwere stabilized by fatty alcohol crystals. Below the meltingtemperature of the crystals, oleogel foams were stable for months.Upon heating, these ultrastable foams collapsed within a few minutes due to the melting of the crystal particles. The transitionbetween crystal formation and melting was reversible, leading to thermoresponsive nonaqueous foams. The reversible switchingbetween ultrastable and unstable foam depended solely on the temperature of the system. We demonstrate that these oleogelfoams can be made to be photoresponsive by using internal heat sources such as carbon black particles, which can absorb UVlight and dissipate the absorbed energy as heat. This simple approach for the formulation of responsive oil foams could be easilyextended to other oleogel systems and could find a broad range of applications due to the availability of the components in largequantities and at low cost.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01250656
Contributor : Arnaud Saint-Jalmes <>
Submitted on : Tuesday, January 5, 2016 - 10:33:11 AM
Last modification on : Thursday, May 28, 2020 - 11:41:15 AM

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Anne-Laure Fameau, Stephanie Lam, Audrey Arnould, Cédric Gaillard, Orlin Velev, et al.. Smart Nonaqueous Foams from Lipid-Based Oleogel. Langmuir, American Chemical Society, 2015, 31 (50), pp.13501−13510. ⟨10.1021/acs.langmuir.5b03660⟩. ⟨hal-01250656⟩

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