Fig. 6From: Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal SolutionspH dependence of zeta potential of unfiltered (a) “standard” and (b) “white” porous silicon colloidal solutions in water. The blue line indicates a −30 mV limit below which the particles in solutions are stable (repel electrically from each other)Back to article page