Aqueous Dispersions of Graphene
Yurtsever, Mustafa Nurullah (2017)
Yurtsever, Mustafa Nurullah
2017
Materials Engineering
Teknisten tieteiden tiedekunta - Faculty of Engineering Sciences
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Hyväksymispäivämäärä
2017-11-08
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201710262073
https://urn.fi/URN:NBN:fi:tty-201710262073
Tiivistelmä
Keywords: graphene, aqueous dispersions, graphene dispersions, graphene colloids, non-covalent functionalization, surfactant stabilization.
Unprecedented properties of graphene continue to incite a great deal of interest for its prospective applications. Graphene is still at its early stages of utilization, and one big challenge is to overcome the strong attraction of graphene flakes and obtain a stable aqueous graphene dispersion at concentration.
To cope with challenge, this study investigates the colloidal stability of aqueous graphene dispersions stabilized by three different stabilizers. It has been identified that one of the stabilizers, the one denoted stabilizer 1, is suitable for the stabilization of commercial graphene flakes in water. Dispersions of graphene stabilized by stabilizer 1 in water has also been characterized by UV-VIS and TGA. As a result, aqueous graphene dispersions of stable for 12 weeks, up to 0,3 wt% graphene concentration as well as a 0,32 surfactant/graphene ratio were achieved.
Unprecedented properties of graphene continue to incite a great deal of interest for its prospective applications. Graphene is still at its early stages of utilization, and one big challenge is to overcome the strong attraction of graphene flakes and obtain a stable aqueous graphene dispersion at concentration.
To cope with challenge, this study investigates the colloidal stability of aqueous graphene dispersions stabilized by three different stabilizers. It has been identified that one of the stabilizers, the one denoted stabilizer 1, is suitable for the stabilization of commercial graphene flakes in water. Dispersions of graphene stabilized by stabilizer 1 in water has also been characterized by UV-VIS and TGA. As a result, aqueous graphene dispersions of stable for 12 weeks, up to 0,3 wt% graphene concentration as well as a 0,32 surfactant/graphene ratio were achieved.