Zwitterionic Graphene Quantum Dots to Stabilize Pickering Emulsions for Controlled-Release Applications

Area of Science:

• Materials Science
• Nanotechnology
• Physical Chemistry

Background:

• Graphene quantum dots (GQDs) are versatile nanocarbon materials with broad application potential.
• Controlling interfacial properties is crucial for advanced material applications.
• Developing novel nanomaterials for interface stabilization and molecular diffusion is an active research area.

Purpose of the Study:

• To synthesize and characterize amphiphilic graphene quantum dots with zwitterionic features (ZGQDs).
• To investigate the ability of ZGQDs to stabilize oil/water interfaces.
• To explore the pH-dependent interfacial behavior of ZGQDs for controlled molecular diffusion.

Main Methods:

• Graphene quantum dots (GQDs) were modified with tertiary amine and alkyl groups to create ZGQDs.
• The interfacial behavior of ZGQDs at the oil/water interface was studied.
• The effect of pH on the blocking and unblocking behavior of ZGQDs was analyzed.

Main Results:

• Successfully fabricated amphiphilic graphene quantum dots with zwitterionic features (ZGQDs).
• ZGQDs demonstrated the ability to stabilize oil/water interfaces.
• The interfacial behavior of ZGQDs was tunable by adjusting the pH of the aqueous phase, enabling switchable molecular diffusion.

Conclusions:

• ZGQDs offer a flexible and adjustable method for manipulating interfacial properties.
• The pH-controlled interfacial behavior of ZGQDs highlights their potential for applications in switchable molecular diffusion.
• This work demonstrates nanoparticle-based controlled molecular diffusion through fluid-fluid interfaces.