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. 2021 Feb 9;16:895–904. doi: 10.2147/IJN.S286406

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© 2021 Ren et al.

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(A–C) photographs and (D–F) SEM images of the samples obtained under different pressure: (A and D) 4MPa; (B and E) 7MPa; (C and F) 15MPa. (G) relationship between sheet thickness and applied pressure. (H and I) photographs of methylene blue solution filtered with different SiO₂ sheets, (H) used the sheet illustrated in (B); (I) used the sheet illustrated in (C); the inserts are the detailed SEM images of the used SiO₂ sheets, respectively.