# Direct 4D printing of functionally graded hydrogel networks for biodegradable, untethered, and multimorphic soft robots

> Research article (International Journal of Extreme Manufacturing, 2023) · cited 34× · AI/ML

**Wikidata**: [openalex:W4389659267](https://www.wikidata.org/wiki/openalex:W4389659267)  
**Source**: https://4ort.xyz/entity/direct-4d-printing-of-functionally-graded-hydrogel-networks-for-biodegradable-untethered-and-multimorphic-soft-robots