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Article Dans Une Revue Journal of the Tunisian Chemical Society Année : 2016

Silica particles with grafted UV-filter for the stabilization of pickering emulsions

Résumé

Pickering emulsions have been prepared using silica particles grafted with UV-filter as stabilizers. Such formulation contains all the ingredients of a sun protection product: organic UV-filter, inorganic particles as anti-UV screen and oil. Grafting the UV-filter is expected to prevent deep penetration of potentially harmful organic molecules inside the skin. p-methoxycinnamate has been immobilized onto to the surface of fumed silica particles. The UV-filter molecule was attached to silica by means of a short (C2) or a long (C10) alkyl spacer to study their effect on grafting degree. Better water dispersion was obtained for the two materials. The water dispersion particles remained stable for 40 days. The hydrophobically-modified silica, with different grafting degrees and linkers, were used for the formulation of o/w Pickering emulsions with various oils of cosmetic relevance: silicone oils of different viscosities and octylbenzoate. The stability and drop size distributions in the different emulsions are evaluated. Stable emulsions were obtained with oil contents in the range 10% to 60%. UV-absorbing ability was retained after immobilization of UV-filter molecules onto silica particles in all emulsion.
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Dates et versions

hal-02842515 , version 1 (15-06-2020)

Identifiants

  • HAL Id : hal-02842515 , version 1

Citer

Ayed Noomane, Rafik Kalfat, Yves Chevalier, Souhaira Hbaieb. Silica particles with grafted UV-filter for the stabilization of pickering emulsions. Journal of the Tunisian Chemical Society, 2016, 18, pp.144-151. ⟨hal-02842515⟩
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