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    Strategy for the development and characterization of environmental friendly emulsions by microfluidization technique

    Year: 2018

    Journal: J. Clean Prod., Volume 178, nov-20, page 723–730

    Authors: Trujillo-Cayado, Luis A.; Santos, Jenifer; Ramirez, Pablo; Alfaro, Maria C.; Munoz, Jose

    Organizations: Spanish Ministerio de Economia y Competitividad [CTQ2015-70700]; European Commission (FEDER Programme)

    Keywords: Biosolvent; Eco-friendly surfactant; Emulsion stability; Fumed silica; Interfacial tension; Microfluidization

    This study reports on the procedure for the development of ecological emulsions formulated with renewable components as a sustainable alternative to products containing traditional organic solvents. Firstly, in order to evaluate the interfacial and emulsifying properties of a green surfactant (Levenol F-200), the adsorption isotherm and interfacial rheology at a biosolvent/water interface were investigated. In the second step, Levenol F-200 and the renewable biosolvent (alpha-pinene) were used in order to obtain stable concentrated emulsions by microfluidization technique. The influence of different configurations in the Microfluidizer, namely Y and Y + Z, on the stability and rheological properties of these emulsions was studied. The characterization of these green systems involved droplet size distributions, Cryo-SEM and optical microscopy, flow and oscillatory shear tests, as well as multiple light scattering. Emulsions with series configuration showed smaller droplet size and better stability against creaming. Lastly, a fumed silica (Aerosil 200) was used as a thickener to modify the rheological properties of the emulsions and hence, to improve their physical stability. Furthermore, this work provides relevant new findings and a systematic strategy for the development of stable green emulsions using an ecological formulation and series configuration in the microfluidization technique. (C) 2018 Elsevier Ltd. All rights reserved.
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