Multifunctional Reversible Self-Assembled Structures of Cellulose-Derived Phase-Change Nanocrystals

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Multifunctional materials with reversible hierarchical structures are highly sought after but rarely achieved.
• Phase-change materials (PCMs) offer potential for controlled structural transitions.

Purpose of the Study:

• To develop novel phase-change nanocrystals (C18-UCNCs) capable of self-assembling into well-ordered hierarchical structures.
• To explore the potential of these self-assembled structures for applications such as thermosensitive imaging.

Main Methods:

• Synthesized core-shell C18-UCNCs with a cellulose crystalline core and a phase-transitioning octadecyl chain shell.
• Investigated the self-assembly behavior of C18-UCNCs into flaky nano/microstructures.
• Evaluated the thermal transport, light-to-thermal conversion, and thermoreversible properties of the self-assembled structures.

Main Results:

• C18-UCNCs successfully self-assembled into ordered, flaky nano/microstructures.
• The self-assembled structures demonstrated efficient thermal transport and light-to-thermal energy conversion.
• These structures exhibited thermoreversible properties, including manipulable surface morphology, wetting, optical properties, and thermally induced self-healing.

Conclusions:

• Phase-change nanocrystals provide a novel platform for engineering reversible self-assembled multifunctional materials.
• This approach offers a promising route for constructing hierarchical structures with tunable properties.
• The developed materials hold significant potential for applications in thermosensitive imaging and beyond.