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. 2017 May 27;7(6):125. doi: 10.3390/nano7060125

Figure 3.

Figure 3

Photograph of centrifuge tubes showing exfoliated samples in different sonication and ozone treatment times: (a) 15 h sonication with 1 h continuous ozone treatment; (b) 3 h sonication with 2 × 10 min intermittent ozone treatment; (c) 6 h sonication with 3 × 10 min ozone treatment; (d) 9 h sonication with 4 × 10 min intermittent ozone treatment; (e) 12 h sonication with 5 × 10 min intermittent ozone treatment; (f) 15 h sonication with 6 × 10 min intermittent ozone treatment; (g) 15 h sonication without ozone treatment.