Hofmeister-Effect-Driven Hybrid Glycerogels for Perfect Wide-Temperature Shape Fixity and Shape Recovery in Soft...

Area of Science:

• Materials Science
• Polymer Chemistry
• Soft Robotics

Background:

• Shape memory gels are vital for soft robotics and biomedical devices.
• Existing gels face challenges like shape fixity/recovery trade-offs and limited operational temperatures.

Purpose of the Study:

• To develop a new class of shape memory hybrid glycerogels (GGs) addressing current limitations.
• To enhance shape fixity, shape recovery, and operational temperature range.

Main Methods:

• Utilized the Hofmeister salting-out effect to modulate internal gel structure.
• Incorporated higher crystallite content, abundant crosslinking, and high elastic modulus.
• Integrated GGs with shape memory alloys to expand temperature capabilities.

Main Results:

• Achieved perfect triple-step shape memory behavior in air with 100% shape fixity and recoverability (75-135°C).
• Demonstrated shape recovery at -40°C under near-infrared light (25-135°C programming range).
• Engineered light-controlled soft robot prototypes showcasing gel versatility.

Conclusions:

• The novel GGs offer superior shape memory properties compared to existing materials.
• The developed composite gel shows significant potential for advanced soft robotics and biomedical applications.
• The integration with shape memory alloys broadens the application scope across diverse thermal environments.