Effects of acidity on the size of polyaniline-poly(sodium 4-styrenesulfonate) composite particles and the stability of corresponding colloids in water

► Polyaniline-poly(sodium 4-styrenesulfonate) (PANI-PSS)composite particles. ► A general oxidation approach to prepare PANI-PSS composite nanoparticles. ► Highly stable colloids in water or buffer over a wide range of pH from 1 to 11. ► Controlled size of the PANI-PSS composite particles by the acidity of precursor solutions.