Nanocomposite Hydrogel Actuators with Ordered Structures: From Nanoscale Control to Macroscale Deformations

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Flexible intelligent actuators are crucial for industrial, biomedical, and soft robotics applications.
• Nanocomposite hydrogels offer pliability, responsiveness, and large reversible deformations.

Purpose of the Study:

• To review recent advances in nanocomposite hydrogels as soft actuators.
• To focus on constructing programmable structures via nano-object assembly within hydrogel matrices.

Main Methods:

• Assembly of nano-objects within a hydrogel matrix.
• Inducing gradient or oriented distributions of nanounits during gelation.
• Utilizing external forces or molecular interactions to control nanounit distribution.

Main Results:

• Achieved ordered nanocomposite hydrogels with controlled nanounit distributions.
• Demonstrated bending, spiraling, patterned, and biomimetic shape changes.
• Highlighted programmable shape-morphing capabilities.

Conclusions:

• Nanocomposite hydrogel actuators show high potential in moving robots, energy collectors, and biomedicines.
• Ordered structures enable complex, biomimetic deformations.
• Challenges and future perspectives in this field are discussed.