Ramos Diego M, Sadtler Véronique, Marchal Philippe, Lemaitre Cécile, Niepceron Frédérick, Benyahia Lazhar, Roques-Carmes Thibault
Laboratoire Réactions et Génie des Procédés (LRGP), UMR 7274 CNRS, Université de Lorraine, 1 Rue Grandville, 54001 Nancy, France.
Institut des Molécules et Matériaux du Mans (IMMM), UMR 6283 CNRS, Le Mans Université, 1 Avenue Olivier Messiaen, CEDEX 9, 72085 Le Mans, France.
Nanomaterials (Basel). 2023 Jan 17;13(3):371. doi: 10.3390/nano13030371.
This paper addresses the impact of the particle initial wetting and the viscosity of the oil phase on the structure and rheological properties of direct (Oil/Water) and reverse (Water/Oil) Pickering emulsions. The emulsion structure was investigated via confocal microscopy and static light scattering. The flow and viscoelastic properties were probed by a stress-controlled rheometer. Partially hydrophobic silica particles have been employed at 1 and 4 wt.% to stabilize dodecane or paraffin-based emulsions at 20 vol.% of the dispersed phase. W/O emulsions were obtained when the particles were dispersed in the oily phase while O/W emulsions were prepared when the silica was introduced in the aqueous phase. We demonstrated that, although the particles adsorbed at the droplets interfaces for all the emulsions, their organization, the emulsion structure and their rheological properties depend in which phase they were previously dispersed in. We discuss these features as a function of the particle concentration and the oil viscosity.
本文探讨了颗粒初始润湿性和油相粘度对直接（油/水）和反向（水/油）Pickering乳液的结构和流变性质的影响。通过共聚焦显微镜和静态光散射研究了乳液结构。用应力控制流变仪探测了流动和粘弹性性质。已采用1 wt.%和4 wt.%的部分疏水二氧化硅颗粒来稳定体积分数为20%的十二烷或石蜡基乳液。当颗粒分散在油相中时得到W/O乳液，而当二氧化硅引入水相中时制备O/W乳液。我们证明，尽管所有乳液中颗粒都吸附在液滴界面上，但它们的排列、乳液结构及其流变性质取决于它们先前分散在哪一相中。我们将这些特征作为颗粒浓度和油粘度的函数进行讨论。
