Fig. 3: The speeds of CNT-bots with a size of ~180 to 300 μm under different conditions.

Plot a shows the variation in the speed of the CNT-bot (u_P) in an aqueous peroxide bath in which the concentration of peroxide (C_Per) was increased from 1% (v/v) to 12% (v/v). Plot b shows the variation in u_P when the pH of the water bath was varied. Plot c shows the variation in u_P in a 5% (v/v) peroxide bath when the pH of the bath was varied. Plot d shows the variation in u_P at different NaHCO₃ loadings, in pure water, and for a Mg-free swimmer. Plot e shows the variation in u_P with different applied magnetic field strengths (H) for a 220 μm particle. Plot f shows the variation in u_P with the intensity of UV LEDs for photoactive CNT-bots.