​Rapid swelling of hydrogel

Hydrogels wetted in water for different period of time
  • Instability/collapse of polymeric materials and their structures in stimulus-induced shape/surface morphology switching, Materials and Design, Vol. 59, 2014, 174-192

Dry hydrogel ball in water

  • ​Instability/collapse of polymeric materials and their structures in stimulus-induced shape/surface morphology switching, Materials and Design, Vol. 59, 2014, 174-192

​Partial wetting and then drying toughgel
Shape dependent buckling mode (twisting or non-twisting)
​Evolution upon wetting in water (twisting/untwisting)
Even (f), the inner part is still in tension, evidenced by sink-in (pushing a straw into the hydrogel then removing it). 

​Water wetting induced temporary surface wrinkling

​
  • Instability/collapse of polymeric materials and their structures in stimulus-induced shape/surface morphology switching, Materials and Design, Vol. 59, 2014, 174-192

​Water droplets on hydrogel

  • Instability/collapse of polymeric materials and their structures in stimulus-induced shape/surface morphology switching, Materials and Design, Vol. 59, 2014, 174-192

​Water droplet on marker pen painted dry PVA glue film (8x)

Active disassembly

​ In room temperature water

​In 80 Deg C water

​Wetting induced buckling in PEG hydrogel (optimized)

Patented:
Embolic Device, An apparatus for embolizing a target vascular site and a method thereof
​栓塞装置、用于栓塞靶血管部位的器械及其方法

​Cooling-responsive shape memory hydrogel

Cooling to melt
From dry to wet in water
Evolution of hardness during drying
(FYP) Oh JX
Small hydrogel 
Big hydrogel

References

​水凝胶-用于切口无缝合修复的可逆电粘附水凝胶
​【天生我材】——水凝胶
DIY hydrogels
​颗粒水凝胶—3D生物打印的新宠
​水凝胶“创口贴”
​​导电、可注射、自愈合水凝胶用于活动部位伤口的修复
高分子吸水树脂在土中的功效