Ultrasound exfoliation of graphite in biphasic liquid systems containing ionic liquids: A study on the conditions for obtaining large few-layers graphene

0501214 - ÚACH 2020 RIV NL eng J - Článek v odborném periodiku
Godoy, A. P. - Ecorchard, Petra - Beneš, Hynek - Tolasz, Jakub - Smržová, Darina - Seixas, L. - Pedrotti, J. J. - de Souza, E. A.T. - El Seoud, O. A. - Donato, R. K.
Ultrasound exfoliation of graphite in biphasic liquid systems containing ionic liquids: A study on the conditions for obtaining large few-layers graphene.
Ultrasonics Sonochemistry. Roč. 55, JUL (2019), s. 279-288. ISSN 1350-4177. E-ISSN 1873-2828
Grant CEP: GA MŠMT(CZ) LM2015073; GA ČR(CZ) GA17-08273S
Institucionální podpora: RVO:61388980 ; RVO:61389013
Klíčová slova: Biphasic liquid system * Cavitation-based emulsification * Graphene * Ionic liquids * Liquid phase exfoliation
Obor OECD: Inorganic and nuclear chemistry; Polymer science (UMCH-V)
Impakt faktor: 6.513, rok: 2019
Způsob publikování: Open access s časovým embargem

Herein we describe a successful protocol for graphite exfoliation using a biphasic liquid system (water/dichloromethane, DCM) containing ionic liquids (ILs, 1,3-dibenzylimidazolium benzoate- and 1-naphthoate). The use of (surface active) IL and sonication led to stable DCM/water (O/W) emulsion, which enhanced graphene formation, suppressed its re-aggregation and decreased shear/cavitation damage. The O/W emulsion stabilization by the ILs was studied by dynamic light scattering (DLS), whereas their interaction with the graphene sheets were described by Density Functional Theory (DFT) calculations. Moreover, a comprehensive investigation on cavitation-based exfoliation in the O/W systems was performed to assess the importance of operational parameters, including, the type of ultrasound processor, ultrasound power and insonation, and the influence of the exfoliation medium.
Trvalý link: http://hdl.handle.net/11104/0297116