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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 10
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: ULTRASONICS SONOCHEMISTRY; v. 55, p. 279-288, JUL 2019.
Web of Science Citations: 2
Abstract

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)

FAPESP's process: 14/22136-4 - Use of green solvents and their mixtures for optimizing chemical processes
Grantee:Omar Abou El Seoud
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
Grantee:Antonio Helio de Castro Neto
Support Opportunities: Research Projects - SPEC Program