In Situ Programming of Shape-Morphing Hydrogels via Vat Photopolymerization for 4D Bioprinting.

As regards the gel fraction, an increasing trend with exposure time is observed, with values rising from approximately 70% to 80%, as reported in Table 1 .

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The results reveal a clear trend: the linear swelling ratio of the hydrogel samples decreases with increasing exposure time per layer during the printing process.

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