Optically- and thermally-responsive programmable materials based on carbon nanotube-hydrogel polymer composites

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Poly(N-isopropylacrylamide) (pNIPAM) hydrogels exhibit thermoresponsive behavior.
• Carbon nanotubes offer enhanced thermal and optical properties.
• Developing advanced actuators requires improved response times and programmability.

Purpose of the Study:

• To fabricate reversible, thermally- and optically responsive actuators.
• To investigate the effect of single-walled carbon nanotubes (SWCNTs) on pNIPAM hydrogel actuator performance.
• To enable the design of complex, programmable self-folding materials.

Main Methods:

• Fabrication of pNIPAM hydrogel composites loaded with SWCNTs.
• Characterization of thermal response times at varying SWCNT concentrations (0.75 mg/mL).
• Evaluation of optical response under laser excitation.

Main Results:

• Achieved up to 5 times enhancement in thermal response time of SWCNT-pNIPAM hydrogel actuators.
• Demonstrated ultrafast near-infrared optical response under laser excitation.
• Tunable response times achieved by adjusting SWCNT loading.

Conclusions:

• SWCNT incorporation significantly enhances the performance of pNIPAM hydrogel actuators.
• The developed composite materials are suitable for creating complex, programmable self-folding structures.
• This approach offers a framework for designing advanced smart materials with tailored properties.