Two dimensional (2D) surfactants are an intriguing class of materials that fall somewhere between traditional small molecule surfactants and solid particle/Pickering stabilizers. Analogous to small molecule surfactants, 2D surfactants spread at high energy interfaces to reduce the total energy of the system. Most Pickering stabilizers are low aspect ratio particles that adsorb to high energy interfaces, such as oil and water, to reduce the interfacial energy of the liquids. Graphene, as a 2D surfactant, spreads at the oil water interface to reduce the total energy of the system, but has a much higher aspect ratio than particle stabilizers. While 2D surfactants have yet to be observed adopting micellar or lamellar structures, they stabilize water-in-oil emulsions with tunable sphere sizes. The incorporation of graphene as a surfactant has enabled the fabrication of conductive polymer foams with properties based both on the monomer selected as an oil phase as well as the contents of the aqueous phase. Herein we explore the properties and stability of emulsions prepared with graphene as a 2D surfactant.

Two dimensional surfactants and porous composite foams: Graphene and boron nitride

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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