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. 2022 Aug 17;15(16):5641. doi: 10.3390/ma15165641

Figure 4.

Figure 4

Surface area–volume model simulation of two neighboring parabolic cracks (thick line) and Gaussian fitting results (thin line) in 2D. The etching rate for bulk silica material was 1.74 μm/h [34], and the etching time was 1–5 h.