Chemicals on demand with phototriggerable microcapsules

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Microcapsules offer controlled release systems.
• Developing light-responsive materials is crucial for advanced applications.
• Carbon nanotubes (CNTs) possess unique photothermal properties.

Purpose of the Study:

• To develop phototriggerable microcapsules for controlled chemical release.
• To demonstrate the remote activation and release capabilities of these microcapsules.
• To showcase their utility in initiating chemical reactions like click chemistry and polymerization.

Main Methods:

• Coencapsulation of carbon nanotubes (CNTs) within liquid-filled microcapsules.
• Utilizing interfacial polymerization for microcapsule fabrication.
• Employing near-infrared (NIR) laser irradiation to trigger microcapsule rupture.

Main Results:

• Successfully synthesized light-rupturable microcapsules containing CNTs.
• Demonstrated triggered release of encapsulated contents in air and liquid media via NIR laser.
• Confirmed optothermal heating of CNTs as the mechanism for shell rupture and release.
• Showcased the storage and release of reactive molecules and catalysts for initiating "click" reactions and ring-opening metathesis polymerization.

Conclusions:

• Phototriggerable microcapsules with embedded CNTs offer a novel platform for remote chemical delivery.
• The optothermal effect enables precise, light-induced release of encapsulated species.
• This technology facilitates controlled initiation of chemical reactions at a distance.