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SEM images of various plugged SBA-15 materials of (A) 70 °C 1 day, (B) 70 °C 3 days, and (C) 80 °C 3 days synthesized through a one-step TEOS addition under static condition during the aging period [21], and (D) the plugged SBA-15 sample synthesized under stirring conditions during the aging period [26]. The scale bars are 3 µm.
