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. Author manuscript; available in PMC: 2021 May 10.
Published in final edited form as: J Control Release. 2020 Feb 3;321:1–22. doi: 10.1016/j.jconrel.2020.01.057

Fig. 2. Principle of ‘sol-gel transition’ of different types of in situ gel used for ocular drug delivery.

Fig. 2.

(A) Schematic principle of sol-gel transition of different types of stimuli-responsive materials. Images of sol-gel transition of thermo-responsive PNIPAAm (from [17]) (B) and ion-responsive gellan gum (C) (from [18]).