Anisotropic structural color particles from colloidal phase separation

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Structural color materials are widely studied for their unique optical properties.
• There is a growing trend towards developing functional structural color materials with novel components and structures for diverse applications.
• Graphene oxide (GO) and colloidal nanoparticles are key components in advanced material design.

Purpose of the Study:

• To investigate the coassembly of graphene oxide (GO) and colloidal nanoparticles in droplets.
• To create novel anisotropic structural color particles (SCPs) with unique morphologies and optical properties.
• To explore the potential of these SCPs and their hydrogel derivatives in biomedical applications, particularly for dynamic cell monitoring and sensing.

Main Methods:

• Coassembly of graphene oxide (GO) and colloidal nanoparticles within droplets.
• Induction of component phase separation to form anisotropic structures.
• Fabrication of inverse opal hydrogel derivatives from the anisotropic SCPs.

Main Results:

• Achieved previously unknown anisotropic structural color particles (SCPs) with hemispherical colloidal crystal clusters and oblate GO components.
• The anisotropic SCPs and their hydrogel derivatives exhibited brilliant structural colors.
• Demonstrated controllable capabilities including fixation, location, orientation, and responsiveness of the anisotropic SCPs.
• Showcased the suitability of anisotropic hydrogel SCPs for dynamic cell monitoring and sensing.

Conclusions:

• Anisotropic SCPs and their inverse opal hydrogel derivatives possess unique structural, morphological, and compositional features.
• These materials exhibit brilliant structural colors and controllable functionalities, making them ideal for advanced applications.
• The anisotropic hydrogel SCPs demonstrate significant potential for dynamic cell monitoring and sensing in biomedical fields.