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At pH 2.0, where in fact the amidino groups tend to be protonated (absolutely charged), and at pH 11.0, where the carboxyl groups are deprotonated (negatively recharged), the PS particles had been well dispersed in aqueous news via electrostatic repulsion. At pH 4.8, where in fact the surface charges tend to be simple, the PS particles were weakly aggregated. Additionally, it absolutely was confirmed that the PS particles can function as a pH-sensitive foam stabilizer foa