Rheology of amino-functionalized graphene oxide suspensions in hydrogels

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dc.contributor.authorMoraes L.R.D.C.
dc.contributor.authorRibeiro H.
dc.contributor.authorAndrade R.J.E.
dc.contributor.authorNaccache M.F.
dc.date.accessioned2024-03-12T19:07:19Z
dc.date.available2024-03-12T19:07:19Z
dc.date.issued2024
dc.description.abstract© 2024 Author(s).This work investigates the effects of amino-functionalized graphene oxide (AFGO) suspensions on the rheological behavior of Carbopol® hydrogels at pHs 5, 7, and 9. The AFGO concentration and media pH were evaluated and related to the suspension's microstructure and rheology. Graphene oxide (GO) nanosheets were synthesized using the modified Hummers method and functionalized with triethylenetetramine via microwave-assisted reaction to produce AFGO. The nanosheets were characterized by different techniques, such as scanning electron microscopy (SEM), thermogravimetric analysis, Raman spectroscopy, and x-ray photoelectron spectroscopy. The suspensions were characterized by rheological tests through steady-state and dynamic flow, zeta potential, and cryo-SEM for microstructure analysis. All samples presented a viscoplastic behavior and were modeled by the Herschel-Bulkley equation. Concerning the base hydrogels, the sample prepared at pH 9 showed lower viscosity, yield stress, and elastic modulus. At all pHs, the increase in the nanosheet concentration promotes a drop in the yield stress, viscosity, storage, and loss moduli. The cryomicrographs showed the impact of pH on the base hydrogel structure. It was also possible to observe that increasing nanoadditive concentration affects the Carbopol microgel swelling and weakens the suspension microstructure.
dc.description.issuenumber1
dc.description.volume36
dc.identifier.doi10.1063/5.0185524
dc.identifier.issn1089-7666
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/33958
dc.relation.ispartofPhysics of Fluids
dc.rightsAcesso Restrito
dc.titleRheology of amino-functionalized graphene oxide suspensions in hydrogels
dc.typeArtigo
local.scopus.citations2
local.scopus.eid2-s2.0-85184075963
local.scopus.subjectCarbopol
local.scopus.subjectFunctionalized
local.scopus.subjectFunctionalized graphene
local.scopus.subjectGraphene oxide nanosheet
local.scopus.subjectGraphene oxides
local.scopus.subjectHummers method
local.scopus.subjectMicrowave-assisted reactions
local.scopus.subjectRheological behaviour
local.scopus.subjectSynthesised
local.scopus.subjectTriethylenetetramine
local.scopus.updated2025-04-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85184075963&origin=inward
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