Figure 1.

SEM images of the surface of samples S-15 min (a), S-30 min (b), and S-50 min (c). In (a), the surface is smooth and contains a small density of spherical nanoparticles on it, while in (b), we reveal that these nanoparticles started to form clusters, which increase in volume with time (see (c)).

Michelakaki et al. Nanoscale Research Letters 2011 6:414   doi:10.1186/1556-276X-6-414
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