The insoluble Prussian blue pigment was dispersed into greener solvents as surface-charged nanoparticles via their surface modification using various alkylamines. The nanoparticles bore negative zeta potentials originated from the surface [FeIII–OH]− moieties and their surrounding protonated alkylamines, [R–NH3]+, and their dispersible nature into solvents was controllable depending on the alkyl-chain lengths.
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Ishizaki et al. (2010) studied this question.
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