Regioselective functionalization of dimpled silica particles

Céline Hubert (1, 2) , Cyril Chomette (3) , Pierre-Etienne Rouet (1, 3) , Antony Désert (3) , Mona Tréguer-Delapierre (3) , Jérôme Majimel (3) , Stéphane Mornet (3) , Adeline Perro (2) , Etienne Duguet (3) , Serge Ravaine (1)

1 CRPP - Centre de Recherche Paul Pascal
2 ISM - Institut des Sciences Moléculaires
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Multipod-like particles made of a silica core surrounded by polystyrene nodules have been used as precur-sors to synthesize silica particles with 3 or 12 dimples through the selective growth of the dielectric core.Using the polymer nodules as temporary protecting masks, we regioselectively grafted amino groupsonto the unprotected silica surface, as revealed by the adsorption of gold markers. After dissolution ofthe PS nodules, some polymer chains remained grafted onto the silica surface, forming organic bumps atthe bottom of the dimples. These residues were also selectively functionalized, leading to silica particleswith both entropic and enthalpic patches.

Mots clés: Surface modification; Regioselectivity; Patchy particles; Silica; Polystyrene

Domaines: Matériaux

Céline Hubert, Cyril Chomette, Pierre-Etienne Rouet, Antony Désert, Mona Tréguer-Delapierre, et al.. Regioselective functionalization of dimpled silica particles. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2016, 510, pp. 239-244. ⟨10.1016/j.colsurfa.2016.05.089⟩. ⟨hal-01385231⟩