SOARES, J.J.S.SANTOS, P.S.ZAIM, M.H.SAKATA, S.K.2019-02-112019-02-11SOARES, J.J.S.; SANTOS, P.S.; ZAIM, M.H.; SAKATA, S.K. The effect of gamma radiation on the stability of aqueous dispersions of graphene oxide and graphene oxide functionalized with amino-peg. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. <b>Resumo...</b> p. 2343-2343. Disponível em: http://repositorio.ipen.br/handle/123456789/29525.http://repositorio.ipen.br/handle/123456789/29525Nanocomposites based on graphene have been prominent in the field of biomedicine due to the biocompatibility with the physiological medium and the possibility of being functionalized by a series of biocompatible polymers, such as chitosan, polyethylene glycol, poly (caprolactone), among others. However, there is a need for sterilization of these nanomaterials in the medical field and gamma irradiation is a promising option. In the present work graphene oxide (GO), produced by the modified Hummers method, was functionalized with amino-PEG (GO-PEG-NH2) through the amidation process. The objective of this study was to evaluate the aqueous dispersions stability of these nanomaterials before and after gamma radiation (Cobalt 60) at a dose of 25 kGy. Dynamics light scattering (DLS) was used to determine the zeta potential. The results showed no significant differences between the zeta potentials of the non-irradiated and irradiated graphene oxide. The dispersion of the functionalized graphene oxide showed to be stable and the irradiated unstable.2343-2343openAccessResumo de eventos científicosaguardandohttps://orcid.org/0000-0001-6072-5853