Synthesis of Hybrid ColloidsThrough the Growth of Polystyrene Latex Particles onto Methacryloxy methyl triethoxysilane -
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Synthesis of Hybrid ColloidsThrough the Growth of Polystyrene Latex Particles onto Methacryloxy methyl triethoxysilane - Functionalized Silica Particles Adeline Perro1,2, Stéphane Reculusa1, Elodie Bourgeat-Lami3, Etienne Duguet2 and Serge Ravaine1 1
Centre de Recherche Paul Pascal – CNRS, 115, avenue du Dr Schweitzer - 33600 Pessac, France Institut de Chimie de la Matière Condensée de Bordeaux – CNRS - 87, avenue du Dr Schweitzer - 33608 Pessac Cedex, France 3 Laboratoire de Chimie et Procédés de Polymérisation – CNRS-CPE Lyon - Bâtiment 308 F, 43, boulevard du 11 novembre 1918 - BP 2077 - 69616 Villeurbanne Cedex, France 2
ABSTRACT Hybrid colloidal particles, which are composed of spherical silica spheres surrounded by a varying number of polystyrene (PS) nodules, were synthesized through a seeded emulsion polymerization process. The hydrophilic character of silica seed particles (from 50 to 400 nm in diameter) were modified by a surface functionalization process performed with a silane derivative. Emulsion polymerization of styrene was carried out in presence of these particles, the formation of polystyrene nodules being highly favored at the silica surface in such conditions. While varying different experimental parameters, we have demonstrated that both the ratio between the number of silica seeds and the number of growing polystyrene nodules and the silane grafting density were key parameters to control the morphology of the final hybrid particles. INTRODUCTION In the last few decades, the interest for hybrid particles with complex shapes that combine organic and inorganic parts has increased considerably due to the potential benefits of these nanoobjects in multiple areas of materials science [1,2]. Indeed, controlling the morphology of colloidal particles is an absolute necessity if one intends to master their physico-chemical properties. As a standard example, core-shell particles consisting of an inorganic core surrounded with an organic shell are currently produced and the range of materials available to get such morphologies is wide [3]. Raspberry-like morphologies have also been frequently reported [4-6]. Today, much attention is devoted to the elaboration of colloidal particles with tunable shapes. For instance, aggregates of spherical colloids with well controlled sizes, shapes, and structures have been fabricated by template-assisted self-assembly [7] or in direct and inverse emulsions [8,9]. However, the association between organic and inorganic materials was only based on weak physical interactions, some attractive capillary forces having formed during solvent evaporation, what suggests that the mechanical and chemical resistance of these aggregates is rather limited. This point could be a major drawback for some critical applications as well as the size of the so-formed hybrid colloidal clusters (that was bigger than 1 micrometer in these works) and the amounts of produced particles that are quite limited. Here, we focus on the synthesis of large amounts of submicron-size
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