Highly monodisperse zwitterion functionalized non-spherical polymer particles with tunable iridescence

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Developing non-spherical polymer particles (NSP) with controlled morphologies is challenging.
• Iridescent materials often rely on complex structures or templates.

Purpose of the Study:

• To present a facile synthetic route for functionalized NSP with tunable morphologies and iridescence.
• To explore the self-assembly of these NSP into photonic crystals.

Main Methods:

• Emulsifier-free emulsion polymerization using a sulfobetaine comonomer.
• Inducing phase separation during polymerization to control particle morphology.
• Fabricating template-free photonic crystal arrays via a bottom-up approach.

Main Results:

• Synthesized monodisperse, zwitterionic NSP with anisotropic shapes (bulge, eye-ball, snowman-like).
• Achieved phase-separated protrusion morphology and a slight increase in aspect ratio.
• Demonstrated self-assembly into ordered structures exhibiting vivid structural colors and photonic bandgaps.

Conclusions:

• The developed method offers a simple, single-step route to functionalized NSP with diverse morphologies.
• The NSP can self-assemble into photonic crystals with tunable, salt-responsive color-changing properties.
• This work provides a pathway for creating advanced optical materials.