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© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Nanographene oxide (GOn) constitutes a nanomaterial of high value in the biomedical field. However, large scale production of highly stable aqueous dispersions of GOn is yet to be achieved. In this work, we explored high-power ultrasonication as a method to reduce particle size of GO and characterized the impact of the process on the physicochemical properties of the material. GOn was obtained with lateral dimensions of 99 ± 43 nm and surface charge of −39.9 ± 2.2 mV. High-power ultrasonication enabled an improvement of stability features, particularly by resulting in a decrease of the average particle size, as well as zeta potential, in comparison to GO obtained by low-power exfoliation and centrifugation (287 ± 139 nm; −29.7 ± 1.2 mV). Remarkably, GOn aqueous dispersions were stable for up to 6 months of shelf-time, with a global process yield of 74%. This novel method enabled the production of large volumes of highly concentrated (7.5 mg mL−1) GOn aqueous dispersions. Chemical characterization of GOn allowed the identification of characteristic oxygen functional groups, supporting high-power ultrasonication as a fast, efficient, and productive process for reducing GO lateral size, while maintaining the material’s chemical features.

Details

Title
High-Yield Production of Nano-Lateral Size Graphene Oxide by High-Power Ultrasonication
Author
Timochenco, Licínia 1 ; Costa-Almeida, Raquel 2   VIAFID ORCID Logo  ; Bogas, Diana 1 ; Filipa A L S Silva 2 ; Silva, Joana 3   VIAFID ORCID Logo  ; Pereira, André 3 ; Magalhães, Fernão D 1   VIAFID ORCID Logo  ; Pinto, Artur M 4   VIAFID ORCID Logo 

 LEPABE, Faculdade de Engenharia, Universidade do Porto, 4200-180 Porto, Portugal; [email protected] (L.T.); [email protected] (D.B.); [email protected] (F.D.M.) 
 i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-180 Porto, Portugal; [email protected] (R.C.-A.); [email protected] (F.A.L.S.S.); INEB—Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, 4200-180 Porto, Portugal 
 IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, 4169-007 Porto, Portugal; [email protected] (J.S.); [email protected] (A.P.); CFP, Department of Physics Engineering, FEUP, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal 
 LEPABE, Faculdade de Engenharia, Universidade do Porto, 4200-180 Porto, Portugal; [email protected] (L.T.); [email protected] (D.B.); [email protected] (F.D.M.); i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-180 Porto, Portugal; [email protected] (R.C.-A.); [email protected] (F.A.L.S.S.); INEB—Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, 4200-180 Porto, Portugal 
First page
1916
Publication year
2021
Publication date
2021
Publisher
MDPI AG
e-ISSN
19961944
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2548720745
Copyright
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.