I wanted to conjugate follic acid to GO as per published report. But as I add NaOH and chloroacetic acid to GO suspension it gets agglomerated or precipitated. Is there any procedure that I need to care?
"Two theories of coagulating effect of electrolytes on colloidal solutions were developed: the adsorptive and electrostatic theories. According to the adsorptive theory of Friendlich the electrolyte ions loaded opposite to a granule are adsorbed on a kernel of a particle and neutralize a charge of the adsorptive layer that leads to coagulation of particles. According to the electrostatic theory of Müller the same ions of electrolyte the electrostatic pushing away force out own antiions of a diffusion layer of micelles in the adsorptive layer. There is a neutralization of a charge of particles own antiions that conducts to their coagulation. Now it is considered that both theories are fair, and both processes at coagulation happen at the same time".
From my experience it does not agglomerate in the presence of NaOH, I've dispersed GO in a 6%wt/v sol of NaOH and had a stable dispersion for quite a long time. Not sure if this could play a role but when I added the NaOH to the GO solution the temp was maintained at 0C accompanied by vigorous stirring.
If you need to receive suspension of a graphene oxide with higher pH, it is possible to add liquid ammonia also slowly. This choice has advantages in comparison with NaOH. GO suspension in such a case is quite steady.
I noticed it too... Check out this paper.
Article The Real Graphene Oxide Revealed: Stripping the Oxidative De...
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