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• W2617157621 abstract "Fatty acids are surfactants of particular interest since they can be extracted from agricultural resources [1]. We report the formation of foams that are responsive to multiple external stimuli (light and temperature) obtained from solution of 12-hydroxy stearic acid (12-HSA), which is self-organized in micron scale tubes [2]. We have previously demonstrated that solutions containing 12-HSA tubes produced foams which were outstandingly stable for months at room temperature conditions (Figure 1.a). We used confocal microscopy, small angle neutron scattering and neutron reflectivity in order to understand the key mechanisms behind the stability of these foams. The tube suspension combines the advantages of both solid large anisotropic particles and low molecular weight surfactants, since this system foams easily but does not age because of an optimal arrangement of monomers and tubes within the foam structure [3]. Upon heating, tubes re-assemble into micelles at a given temperature, which results in rapid foam destabilization. The foam stability can then be reversibly tuned from high to weak by simply changing the polymorphism of the system by temperature (Figure 1.b). In a further step, we combined these thermoresponsive 12-HSA tubes with carbon black particles, which resulted in foams whose stability could easily be tuned by UV irradiation [4]. Upon exposure to UV illumination, particles absorb light radiation and act as photothermal heat converters resulting in a temperature increase inside the foam liquid channels. This results in the transition of tubes into micelles in the foam, leading to a very fast foam destabilization (Figure 1.c). The above approach was extended to magnetic particles, producing the first foam exhibiting thermo-photo-magneto-tuneable responsiveness. Thus, our approach based on green surfactants mixed with various particles, successfully provides excellent foamability and results in foams which stability can be reversibly switch between ultrastability and instability by light, temperature and magnetic field." @default.
• W2617157621 created "2017-06-05" @default.
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• W2617157621 date "2013-09-15" @default.
• W2617157621 modified "2023-09-25" @default.
• W2617157621 title "Smart Foams: Robust Control of Foam Stability by Temperature and Ligh t?" @default.
• W2617157621 hasPublicationYear "2013" @default.
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