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. Author manuscript; available in PMC: 2019 Jul 28.
Published in final edited form as: J Control Release. 2018 Apr 19;282:62–75. doi: 10.1016/j.jconrel.2018.04.032

Fig. 1.

Fig. 1

Electron microscopy images of the particles: TEM images of (A) Uniform c.a. 100 nm core Stöber NPs; (B) Disulfide-based mesoporous shell (15 nm) coated Stöber NPs synthesized by the addition of TEOS and BTESPD precursors; and (C and D) GSH-sensitive HMSiO2 NPs (c.a. 130 nm) under two magnifications. SEM images of (E) GSH-sensitive HMSiO2 NPs and (F) Broken NP showing voluminous (surface area: 446 m2 g−1) hollow interior. TEM images of (G) Mesoporous shell coated Stöber NPs synthesized by the addition of TEOS; (H and I) TEOS HMSiO2 NPs under two magnifications.