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Formulation variables influencing the properties and physical stability of green multiple emulsions stabilized with a copolymer

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Abstract

To obtain multiple emulsions containing Agnique™ AE 3-2H as oil phase and Atlas™ G-5000 as emulsifier, two formulation variables were studied: the effect of the Atlas™ G-5000 concentration in emulsions containing 15 wt% Agnique™ AE 3-2H and the study of the influence of the solvent concentration maintaining the Agnique™ AE 3-2H/Atlas™ G-5000 ratio equal to 10. To assess microstructure and physical stability of these emulsions different techniques were employed, namely laser diffraction, transmitted light optical microscopy, steady-state measurements, and multiple light scattering. An increase in copolymer concentration and solvent concentration provoked a decrease in Sauter diameter but an increase in volume mean diameter and polydispersion due to droplet coalescence. Regardless of polymer concentration, all emulsions showed Newtonian behavior which led to shear thinning with increasing oil concentration. The main destabilization processes are creaming, when the concentration of polymer or solvent is low, and coalescence, when both concentrations are high.

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Acknowledgments

The financial support received from the Spanish Ministerio de Economía y Competitividad (MINECO) and FEDER, UE is kindly acknowledged (project CTQ2015-70700-P).

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Authors and Affiliations

  1. Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, c/ P. García González, 1, 41012, Sevilla, Spain

    María Carmen García, José Muñoz & María-Carmen Alfaro-Rodriguez

  2. Departamento Ingeniería Química, Pro2TecS – Chemical Process and Product Technology Research Center, ETSI, Universidad de Huelva, Campus de “El Carmen”, 21071, Huelva, Spain

    José M. Franco

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  1. María Carmen García
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  2. José Muñoz
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Correspondence to María-Carmen Alfaro-Rodriguez.

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García, M.C., Muñoz, J., Alfaro-Rodriguez, MC. et al. Formulation variables influencing the properties and physical stability of green multiple emulsions stabilized with a copolymer. Colloid Polym Sci 297, 1095–1104 (2019). https://doi.org/10.1007/s00396-019-04529-y

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  • DOI: https://doi.org/10.1007/s00396-019-04529-y

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