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Nitrogen adsorption and desorption isotherms for bare (A) 1100, (B) 450, (C) 150, and (D) 30 nm MSNs. The estimated pore width distributions calculated via BJH analysis of the adsorption branch are presented in (E) for the (i) 1100, (ii) 450, (iii) 150, and (iv) 30 nm particles.
