Synthesis of Amphiphilic Silica Nanoplatelets via Surface Initiated ATRP for Effective Stabilization of Pickering Emulsion Drops
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Amphiphilic Janus particles are widely considered as advanced Pickering emulsion stabilizers due to their unique biphasic structure. In general, particles with a plate-geometry exhibit excellent interfacial adhesion energy, which is originated from their high geometric anisotropy. Herein, we introduce a new synthetic approach to obtain amphiphilic silica nanoplatelets (ASNPs) which enables self-assembly at the oil-water interface. For synthesis of ASNPs, we sythesized silica nanoplatelets (SiNPs) from polypeptide-templated silicification. The conformation changes to -sheet structure led to formation of plate geometry. Stepwise modification of SiNPs was conducted for the preparation of macroinitiator. The ASNPs were finally obtained by carrying out SI-ARGET ATRP against the neat SiNPs located the O/W interface, thus simultaneously grafting both hydrophilic and hydrophobic polymers on each SiNP surface.