Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(Ethylene Glycol) Suspensions
This work studies the influence of the concentration and oxidation degree on the rheological behavior of graphene oxide (GO) nanosheets dispersed on polyethylene glycol (PEG). The rheological characterization was fulfilled in shear flow through rotational rheometry measurements, in steady, transient...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-03-01
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| Series: | Fluids |
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| Online Access: | https://www.mdpi.com/2311-5521/5/2/41 |
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| author | Yago Chamoun F. Soares Elyff Cargnin Mônica Feijó Naccache Ricardo Jorge E. Andrade |
| author_facet | Yago Chamoun F. Soares Elyff Cargnin Mônica Feijó Naccache Ricardo Jorge E. Andrade |
| author_sort | Yago Chamoun F. Soares |
| collection | DOAJ |
| description | This work studies the influence of the concentration and oxidation degree on the rheological behavior of graphene oxide (GO) nanosheets dispersed on polyethylene glycol (PEG). The rheological characterization was fulfilled in shear flow through rotational rheometry measurements, in steady, transient and oscillatory regimes. Graphene oxide was prepared by chemical exfoliation of graphite using the modified Hummers method. The morphological and structural characteristics originating from the synthesis were analyzed by X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, and atomic force microscopy. It is shown that higher oxidation times increase the functional groups, which leads to a higher dispersion and exfoliation of GO sheets in the PEG. Moreover, the addition of GO in a PEG solution results in significant growth of the suspension viscosity, and a change of the fluid behavior from Newtonian to pseudoplastic. This effect is related to the concentration and oxidation level of the obtained GO particles. The results obtained aim to contribute towards the understanding of the interactions between the GO and the polymeric liquid matrix, and their influence on the suspension rheological behavior. |
| first_indexed | 2024-12-22T17:19:48Z |
| format | Article |
| id | doaj.art-7cdcfa2cf57e45ed91b14e34782ca00a |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-12-22T17:19:48Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-7cdcfa2cf57e45ed91b14e34782ca00a2022-12-21T18:18:52ZengMDPI AGFluids2311-55212020-03-01524110.3390/fluids5020041fluids5020041Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(Ethylene Glycol) SuspensionsYago Chamoun F. Soares0Elyff Cargnin1Mônica Feijó Naccache2Ricardo Jorge E. Andrade3Department of Mechanical Engineering, Pontificia Universidade Católica-RJ, Rua Marquês de São Vicente 225, Rio de Janeiro, RJ 22453-900, BrazilMackgraphe-Graphene and Nano-Material Research Center, Instituto Presbiteriano Mackenzie-SP, Rua da Consolação 896, São Paulo SP 01302-907, BrazilDepartment of Mechanical Engineering, Pontificia Universidade Católica-RJ, Rua Marquês de São Vicente 225, Rio de Janeiro, RJ 22453-900, BrazilMackgraphe-Graphene and Nano-Material Research Center, Instituto Presbiteriano Mackenzie-SP, Rua da Consolação 896, São Paulo SP 01302-907, BrazilThis work studies the influence of the concentration and oxidation degree on the rheological behavior of graphene oxide (GO) nanosheets dispersed on polyethylene glycol (PEG). The rheological characterization was fulfilled in shear flow through rotational rheometry measurements, in steady, transient and oscillatory regimes. Graphene oxide was prepared by chemical exfoliation of graphite using the modified Hummers method. The morphological and structural characteristics originating from the synthesis were analyzed by X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, and atomic force microscopy. It is shown that higher oxidation times increase the functional groups, which leads to a higher dispersion and exfoliation of GO sheets in the PEG. Moreover, the addition of GO in a PEG solution results in significant growth of the suspension viscosity, and a change of the fluid behavior from Newtonian to pseudoplastic. This effect is related to the concentration and oxidation level of the obtained GO particles. The results obtained aim to contribute towards the understanding of the interactions between the GO and the polymeric liquid matrix, and their influence on the suspension rheological behavior.https://www.mdpi.com/2311-5521/5/2/41graphene oxidepolyethylene glycolrheological characterization |
| spellingShingle | Yago Chamoun F. Soares Elyff Cargnin Mônica Feijó Naccache Ricardo Jorge E. Andrade Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(Ethylene Glycol) Suspensions Fluids graphene oxide polyethylene glycol rheological characterization |
| title | Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(Ethylene Glycol) Suspensions |
| title_full | Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(Ethylene Glycol) Suspensions |
| title_fullStr | Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(Ethylene Glycol) Suspensions |
| title_full_unstemmed | Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(Ethylene Glycol) Suspensions |
| title_short | Influence of Oxidation Degree of Graphene Oxide on the Shear Rheology of Poly(Ethylene Glycol) Suspensions |
| title_sort | influence of oxidation degree of graphene oxide on the shear rheology of poly ethylene glycol suspensions |
| topic | graphene oxide polyethylene glycol rheological characterization |
| url | https://www.mdpi.com/2311-5521/5/2/41 |
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