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(a) TEM image of PS–PDMA nanoparticles (sample A) casted from an aqueous solution (0.2 g L–1). The carbon/Formvar-coated TEM grids were treated with air plasma to improve their hydrophilicity prior to use. The nanoparticles were stained with RuO4. (a) Sample prepared through complete evaporation of the water in a droplet placed on the grid (method i). (b, c) Sample prepared by absorbing the excess of solution with a piece of paper placed under the grid (method ii).
