@article{ZhangBehlBalketal.2020,
  author    = {Zhang, Pengfei and Behl, Marc and Balk, Maria and Peng, Xingzhou and Lendlein, Andreas},
  title     = {Shape-programmable architectured hydrogels sensitive to ultrasound},
  series = {Macromolecular rapid communications},
  volume    = {41},
  journal   = {Macromolecular rapid communications},
  number    = {7},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1022-1336},
  doi       = {10.1002/marc.201900658},
  pages     = {7},
  year      = {2020},
  abstract  = {On-demand motion of highly swollen polymer systems can be triggered by changes in pH, ion concentrations, or by heat. Here, shape-programmable, architectured hydrogels are introduced, which respond to ultrasonic-cavitation-based mechanical forces (CMF) by directed macroscopic movements. The concept is the implementation and sequential coupling of multiple functions (swellability in water, sensitivity to ultrasound, shape programmability, and shape-memory) in a semi-interpenetrating polymer network (s-IPN). The semi-IPN-based hydrogels are designed to function through rhodium coordination (Rh-s-IPNH). These coordination bonds act as temporary crosslinks. The porous hydrogels with coordination bonds (degree of swelling from 300 +/- 10 to 680 +/- 60) exhibit tensile strength sigma(max) up to 250 +/- 60 kPa. Shape fixity ratios up to 90\% and shape recovery ratios up to 94\% are reached. Potential applications are switches or mechanosensors.},
  language  = {en}
}