Figure 3.

SEM images of low molecular weight PMMA mixed with silica sol. Mixing ratio of (a) 3:1, (b) 4:1, and (c) 5:1 of PMMA/silica sol, and (d, e, f) the corresponding silica beads of (a, b, c), after removing PMMA, respectively.

Lee et al. Nanoscale Research Letters 2012 7:440   doi:10.1186/1556-276X-7-440
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