4D Printing of Shape-Memory Hydrogels for Soft-Robotic Functions

MD Nahin Islam Shiblee, Kumkum Ahmed, Masaru Kawakami, Hidemitsu Furukawa

Research output: Contribution to journalArticlepeer-review

137 Citations (Scopus)


Hydrogel actuators with soft-robotic functions and biomimetic advanced materials with facile and programmable fabrication processes remain scarce. A novel approach to fabricating a shape-memory-hydrogel-(SMG)-based bilayer system using 3D printing to yield a soft actuator responsive to the methodical application of swelling and heat is introduced. Each layer of the bilayer is composed of poly(N,N-dimethyl acrylamide-co-stearyl acrylate) (P(DMAAm-co-SA))-based hydrogels with different concentrations of the crystalline monomer SA within the SMG network and which exhibit distinctive physicochemical properties that enable anisotropic swelling-induced actuation of the bilayer with reversible shape-memory properties. The deformation, reversibility, and response time of the bilayer actuator are extensively dependent on temperature. Utilizing the proposed SMG bilayer actuator model with its synergistic functions, a nature-inspired flower architecture that changes its shape upon immersion in water and an underwater 3D macroscopic soft gripper that can grab, transport, and release a guest substance are developed to demonstrate the applicability of these hydrogels in biomimetic actuators, encapsulating systems, and soft robotics.

Original languageEnglish
Article number1900071
JournalAdvanced Materials Technologies
Issue number8
Publication statusPublished - 2019 Aug
Externally publishedYes


  • 3D Printing
  • 4D printing
  • biomimetic actuators
  • shape memory hydrogels
  • soft robotics

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Industrial and Manufacturing Engineering


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