Ultrasound exfoliation of graphite in biphasic liquid systems containing ionic liquids: a study on the conditions for obtaining large few-layers graphene
| Autor: | Anna Paula Godoy, Eunézio A. Thoroh de Souza, Petra Ecorchard, Ricardo K. Donato, Omar A. El Seoud, Darina Smržová, Jairo J. Pedrotti, Leandro Seixas, Jakub Tolasz, Hynek Beneš |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Sonication 02 engineering and technology ESPECTROSCOPIA RAMAN 010402 general chemistry 01 natural sciences law.invention Inorganic Chemistry chemistry.chemical_compound Dynamic light scattering law Chemical Engineering (miscellaneous) Environmental Chemistry Radiology Nuclear Medicine and imaging Graphite Graphene Organic Chemistry 021001 nanoscience & nanotechnology Exfoliation joint 0104 chemical sciences Chemical engineering chemistry Cavitation Emulsion Ionic liquid 0210 nano-technology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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