Syntheses of Raspberrylike Silica/Polystyrene Materials

Abstract

Raspberrylike hybrid organic-inorganic materials consisting of spherical silica beads supporting smaller polystyrene particles were prepared through a heterophase polymerization process. In a first step, micrometer-sized silica particles were synthesized according to procedures inspired from the literature. In a second step, a poly(ethylene glycol) macromonomer was adsorbed on the surface of the silica beads. Finally, polymerization of styrene was achieved in water with a nonionic surfactant as an emulsifying agent and sodium persulfate as an initiator. Scanning and transmission electron microscopies show that the presence of the macromonomer on the surface of the silica particles is a determining parameter in order to get the raspberrylike morphology.

Mechanism governing nanoparticle flow behaviour in porous media: insight for enhanced oil recovery applications

“…This was demonstrated by Reculusa et al [151] when they modified the surface of silica nanoparticles by adsorption of an oxyethylene based macromonomers. Hydrogen bond with the silanol functions present on the surface of the silica was formed.…”

Design, Synthesis, and Application of Anisotropic Janus Particles

“…in raspberry-like shape [24]. Also, many free polymer particles were formed in the continuous phase except on the surface.…”

Fabrication of Surfaces with Bimodal Roughness Through Polyelectrolyte/Colloid Assembly

“…This is exemplified by the Lotus effect, in which a dual size roughness seems to be important (Barthlott & Neinhuis, 1997;Patankar, 2004). Raspberry-like surface morphologies were created in different ways : styrene polymerization (Perro et al, 2006;Reculusa et al, 2002) or gold sputtering (Xiu et al, 2006) on silica particles , controlled aggregation of different surface-functionalized silica particles (Ming et al, 2005) or direct electrochemical synthesis of gold microaggregates (Li Z. et al, 2007) and immobilization on a specific substrate. In this paper, we prepare surfaces covered with a homogeneous monolayer of colloidal particles, using adhesion of negatively charged polystyrene latex beads on a polycationprecoated glass substrate.…”

“…Suspensions of raspberry-like particles were prepared by styrene polymerization on silica particles (Perro et al, 2006;Reculusa et al, 2002). In another study, silica particles having different sizes and bearing functional groups were firstly synthesized independently and then mixed to react together.…”