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

Autor(es)

Godoy, Anna P. ^[1] ; Ecorchard, Petra ^[2] ; Benes, Hynek ^[3] ; Tolasz, Jakub ^[2] ; Smrzova, Darina ^[2] ; Seixas, Leandro ^[1] ; Pedrotti, Jairo J. ^[1] ; de Souza, Eunezio A. T. ^[1] ; El Seoud, Omar A. ^[4] ; Donato, Ricardo K. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, Rua Consolacao 930, Sao Paulo, SP - Brazil

^[2] CAS, Inst Inorgan Chem, Vvi, Rez 25068 - Czech Republic

^[3] CAS, Inst Macromol Chem, Vvi, Heyrovsky Sq 2, Prague 16206 6 - Czech Republic

^[4] Univ Sao Paulo, Inst Chem, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ULTRASONICS SONOCHEMISTRY; v. 55, p. 279-288, JUL 2019.
• Citações Web of Science: 2

Resumo

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. (AU)

• Processo FAPESP: 14/22136-4 - Uso de solventes verdes e suas misturas na otimização de processos químicos
• Beneficiário: Omar Abou El Seoud
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
• Beneficiário: Antonio Helio de Castro Neto
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC