pH dependent stability of aqueous suspensions of graphene with adsorbed weakly ionisable cationic polyelectrolyte
Stable graphene suspensions were prepared through ultrasonic exfoliation followed by surface modification with the cationic polyelectrolyte poly(ethyleneimine) (PEI). The stability of the suspensions was found to be dependent upon the pH of the solution and the molecular weight of the PEI adsorbed. For the graphene sheets with adsorbed PEI with a molecular weigh of 600. Da, the particles were stabilised through an increased electrostatic repulsion at low pH inferred from in an increase in the...[Show more]
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|Source:||Journal of Colloid and Interface Science|
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