Dynamic organic crystals as exceptionally efficient artificial natural light-harvesting actuators

Area of Science:

• Materials Science
• Organic Chemistry
• Energy Conversion

Background:

• Dynamic organic crystals offer potential for artificial actuators by converting solar energy to mechanical work.
• Efficient conversion of natural light into mechanical energy using these crystals remains a significant challenge.

Purpose of the Study:

• To synthesize a novel dynamic organic crystal capable of efficient natural light to mechanical energy conversion.
• To investigate the photomechanical properties and energy transduction capabilities of its polymorphs.

Main Methods:

• Synthesis of a novel dynamic organic crystal with two polymorphs (Form I and Form II).
• Irradiation with ultraviolet (UV), blue, and natural light to trigger photosalient effects and photoinduced bending.
• Quantification of output work densities for both polymorphs and a developed micro-actuator.

Main Results:

• Both polymorphs effectively convert natural light into mechanical work.
• Form I exhibits high work densities (4.2-8.4 × 10^4 J m^-3) under UV light.
• Form II shows work densities (1.3 × 10^2 to 1.9 × 10^3 J m^-3) via photoinduced bending.
• A natural light-driven micro-actuator based on Form I achieved work densities of 2.8-5.0 × 10^4 J m^-3.

Conclusions:

• The synthesized dynamic organic crystals efficiently convert natural light into mechanical work.
• Photoinduced bending in Form II may be more advantageous for energy harvesting than the photosalient effect.
• The developed micro-actuator demonstrates superior natural light-harvesting performance compared to existing photomechanical crystals.