Figure 2

(a) TGA profiles of P-123, MSP-s and MSP-l. Nitrogen sorption isotherms (b), pore size distribution (c) and particle size distribution (d) of MSP-s and MSP-l. SEM (e) (imaged with a voltage of 5 kV) and cryo-SEM (f) (imaged with a voltage of 2 kV) images of MSP-l.