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Detailed investigation of nano-emulsions obtained from the Remcopal 4/decane/water system

Abstract : We have investigated the phase behavior of the Remcopal 4/decane/water system. Direct lamellar phase (L-alpha), reverse hexagonal (H-2) liquid crystals, and reverse micellar phase L-2 were identified. Then, nano-emulsions have been formulated by the phase inversion temperature (PIT) method and characterized by various techniques such as dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), conductivity, and small angle X-ray scattering (SAXS). For oil/surfactant ratios comprising between 2.3 and 5.7, a domain of nano-emulsion, stable between 20 and 27 degrees C, which extend up to 95 wt.% of water, is formed. The size of nano-emulsions is around 100 nm of diameters. It increases with the oil/surfactant ratio. The conductivity and the SAXS analyzes show that there is a strong relation between the joint presence of a dispersion of the lamellar phase L-alpha, the sponge phase L3, and the formation of the nano-emulsions. Finally, the obtained nano-emulsions have been used as building blocks to prepare porous silica. Surprisingly, materials with a pore size in the micrometer range have been recovered.
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Philippe Riachy, Na Du, Marie-José Stebe, Jean-Luc Blin. Detailed investigation of nano-emulsions obtained from the Remcopal 4/decane/water system. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2015, 481, pp.207-214. ⟨10.1016/j.colsurfa.2015.05.002⟩. ⟨hal-01495206⟩



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