Nanosheet size-dependent rheology, microstructure, adsorption properties of graphene oxide-electrolyte dispersions and adsorbents

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dc.contributor.author Ojha, Abhijeet
dc.contributor.author Ibrahim, Helen
dc.contributor.author Alyabyeva, Natalia
dc.contributor.author Lazzari, Remi
dc.contributor.author Goldmann, Michel
dc.contributor.author Thareja, Prachi
dc.date.accessioned 2020-08-07T14:26:29Z
dc.date.available 2020-08-07T14:26:29Z
dc.date.issued 2020-011
dc.identifier.citation Ojha, Abhijeet; Ibrahim, Helen; Alyabyeva, Natalia; Lazzari, Remi; Goldmann, Michel and Thareja, Prachi, "Nanosheet size-dependent rheology, microstructure, adsorption properties of graphene oxide-electrolyte dispersions and adsorbents", Synthetic Metals, DOI: 10.1016/j.synthmet.2020.116494, vol. 269, Nov. 2020. en_US
dc.identifier.issn 0379-6779
dc.identifier.uri http://dx.doi.org/10.1016/j.synthmet.2020.116494
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/5603
dc.description.abstract The variation of lateral dimensions of GO nanosheets by subjecting them to different ultrasonication time (t = 30, 60, and 120 min) influences the rheology, microstructure, and adsorption capacity of graphene oxide (GO) suspensions. The average storage modulus (G'p) of GO aqueous dispersions (volume fraction (?GO) = 0.018) varies as GO-30 < GO-60 < GO-120, although the C/O of GO nanosheets does not change significantly with ultrasonication. Addition of 10?5 M � 10-1 M NaCl and MgCl2 lead to a rise in G'p as compared to electrolyte-free suspensions with the formation of liquid-like, fragile gels and solid gel-like samples. Independent of time of ultrasonication, solid gels are formed at 10-1 M of electrolytes. The maximum G'p is observed in gels of GO-30 with 10-1 M MgCl2. We hypothesize that an increase in ultrasonication time causes the formation of new nanosheets with un-functionalized edges. While Na+ screens the negative charge of GO causing aggregation, but Mg2+ not only screens but also interacts with carboxyl groups of GO nanosheets. Therefore, the degree of Mg2+ bridging the GO nanosheets is the lowest in GO-120 and the highest in GO-30 suspensions. The adsorption capacity of methylene blue (MB) on GO-120-electrolyte lyophilized gels is the smallest, in agreement with the weak cross-linking and mechanical strength of these gels.
dc.description.statementofresponsibility by Abhijeet Ojha, Helen Ibrahimb, Natalia Alyabyeva, Remi Lazzari, Michel Goldmann and PrachiThareja
dc.language.iso en_US en_US
dc.publisher Elsevier en_US
dc.subject Rheology en_US
dc.subject Microstructure en_US
dc.subject Graphene oxide en_US
dc.subject Gel en_US
dc.subject Adsorption en_US
dc.title Nanosheet size-dependent rheology, microstructure, adsorption properties of graphene oxide-electrolyte dispersions and adsorbents en_US
dc.type Article en_US
dc.relation.journal Synthetic Metals


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