Figure 3.

Dissolution process of the sugar glass mold and final gelation step of the scaffold. (a) $\mathrm{t}=0$ min, fresh CaCl₂ solution above the dashed line and dissolved sugar at the bottom (yellowish liquid). (b) $\mathrm{t}=2$ min, the inlet jets of fresh CaCl₂ solution (green arrows) made holes in the sugar glass mold (red circles). The blue arrows and blue outlined area show the dissolving inner structures that are falling to the bottom. (c) Dissolution of the mold at $\mathrm{t}=$ 4 min. (d) Dissolution of the mold at $\mathrm{t}=$ 6 min. (e) $\mathrm{t}=10$ min, the scaffold was manually cut with a scalpel at the site represented by the dotted line. (f) $\mathrm{t}=15$ min, the dissolution and gelation processes were completed.