Cephalopod-Inspired Chemical-Gated Hydrogel Actuation Systems for Information 3D-Encoding Display

Area of Science:

• Biomimetic materials science
• Soft robotics
• Supramolecular chemistry

Background:

• Cephalopods exhibit sophisticated skin displays for camouflage and communication.
• Replicating cephalopod-like dynamic displays in artificial systems is crucial for advanced information encoding.
• Existing artificial soft actuators lack the chemical-gated control seen in cephalopod muscles.

Purpose of the Study:

• To develop artificial soft actuators mimicking cephalopod skin's chemical-gated actuation.
• To create a biomimetic display system for high-security 3D information encoding.
• To explore supramolecular host-guest interactions for intelligent hydrogel programming.

Main Methods:

• Fabrication of azobenzene-functionalized poly(acrylamide) (PAAm) hydrogels.
• Utilizing α-cyclodextrin (α-CD) to gate the upper critical solution temperature (UCST) responsiveness of PAAm hydrogels via host-guest interactions.
• Designing a biomimetic display system based on α-CD-gated hydrogel actuators for fluorescence output.

Main Results:

• Demonstrated a novel α-CD-gated "thermal stimulation-hydrogel actuation-fluorescence output" display mechanism.
• Achieved dynamic and static, spatially controlled multicolor fluorescent displays.
• Created high-security 3D-encoding information carriers with single-input multiple-output capabilities.

Conclusions:

• The α-CD-gated hydrogel actuator successfully mimics cephalopod skin muscle function.
• This bioinspired strategy offers a new paradigm for artificial display systems and information security.
• The developed system enables unprecedented control over display modes and spatial information encoding.