Self-folding origami machines powered by chemical reaction

https://news.cornell.edu/stories/2023/05/self-folding-origami-machines-powered-chemical-reaction

"actuates 600 ms per cycle, 20°C, faster... direct chemical to mechanical transduction... ultrathin platinum sheets capped with titanium... electronic structure calculations dissect reaction hydrogen adsorbed to material exposed to oxygen... deform and bend... work in gaseous environments... autonomous chemical system that regulates flows based on chemical composition"