Fig. 4. (a) Speed of Janus particles at different H2O2 concentrations. Smooth Particles S1 and S2 show a maximum mean speed of 3 μm s–1 while particles R1 and R2 have a maximum mean speed of 7 μm s–1 and 13 μm s–1, respectively, for a 15% H2O2 concentration. (b) Translational diffusion coefficient D diff of Janus particles R1, R2, S1 and S2 obtained by fitting eqn (1) for to the mean squared displacement of the trajectory (from 0 to 2 s) with the error bars as weights (see Fig. S1, ESI†). (c) MSD plot with error bars for the 15% H2O2 concentration for different particles.
