Fabrication of Amphiphilic Janus Silica Nanospheres for Pickering Emulsions

We report a facile method for preparation of amphiphilic Janus silica nanospheres using layered double hydroxide as a protective support. The unprotected part of silica nanospheres is modified with a hydrophobic reagent. This type of Janus silica nanospheres can be used as a novel colloidal surfactant for stabilization of the Pickering emulsion for at least 2 months. Amphiphilic Janus silica nanospheres are prepared by introducing CoAl-LDH as a shielding template. They can be used as a solid surfactant for stabilization of Pickering emulsion and greatly enhancing the emulsion stability.