Figure 3: Kinetics of assembly under optical field excitation.
From: Spatially and temporally reconfigurable assembly of colloidal crystals
(a–f) Time lapse images of PMMA particles (ϕ0=0.05) concentrating in the 25 × 25 μm2 region that was illuminated. The particle and solvent conditions are as in Fig. 1e. Scale bar, 5 μm. (g) Particle volume fraction, ϕ, monotonically increases until it reaches steady state. (h) Quantification of the critical concentration time, tc, shows that time for accumulation decreases with increasing laser power density and initial volume fraction. The error bars indicate s.d.
