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    Interfacial Assembly of Graphene Oxide: From Super Elastic Interfaces to Liquid-in-Liquid Printing

    Year: 2022

    Journal: Adv. Mater. Interfaces, Volume 9, FEB

    Authors: Kamkar, Milad; Erfanian, Elnaz; Bazazi, Parisa; Ghaffarkhah, Ahmadreza; Sharif, Farbod; Xie, Ganhua; Kannan, Aadithya; Arjmand, Mohammad; Hejazi, S. Hossein; Russell, Thomas P.; Fuller, Gerald G.; Sundararaj, Uttandaraman

    Organizations: Natural Sciences and Engineering Research Council (NSERC) of Canada; Mitacs Globalink Research Award; Alberta Innovates Graduate Student Scholarships; Canada Research Chairs program

    Keywords: graphene oxide; interfacial rheology; liquid-in-liquid printing; oil; water interface

    Tailoring the oil/water (O/W) interface is a prerequisite for structuring these two immiscible liquids into prescribed architectures, i.e., liquid-in-liquid printing, which is an emerging area in material science. Here, assemblies of graphene oxide (GO) at O/W and air/W interfaces are characterized using a wide range of interfacial rheological techniques. It is shown that the GO nanosheets assemble at the interface, even at extremely low concentrations as low as 0.04 vol%, significantly increasing the elasticity at O/W or air/W interfaces. This is attributed to the combined hydrophobic and hydrophilic nature of GO. Interfacial elastic modulus of approximate to 1800 mN m(-1) is achieved, making GO assemblies exceptional candidates for applications where stabilization of the O/W interface is indispensable. Herein, the super elastic character of the O/W interface with GO assemblies is capitalized for all-liquid 2D printing in a low viscous oil, underscoring the utility of these all-liquid systems for electronics, fluidic devices, and controlled release systems.
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