Effective repulsive interaction between Janus polymer-grafted nanoparticles adhering to lipid vesicles

Area of Science:

• Biophysics
• Materials Science
• Nanotechnology

Background:

• Nanoparticle adhesion to lipid vesicles induces membrane curvature deformations.
• These deformations mediate interactions between nanoparticles, leading to aggregation or endocytosis.
• Uniform nanoparticles form close-packed clusters or undergo endocytosis based on adhesion strength.

Purpose of the Study:

• To investigate surface modification of nanoparticles to control self-assembly behavior.
• To suppress close-packed clustering and endocytosis of nanoparticles interacting with lipid membranes.
• To enable tunable and reliable self-assembly of nanoparticles.

Main Methods:

• Utilized Janus particles with polymer-grafted moieties.
• Investigated the role of osmotic pressure from polymer brushes.
• Analyzed inter-nanoparticle repulsion due to polymer brush interactions.

Main Results:

• Janus particle surface modification suppressed nanoparticle endocytosis.
• Osmotic pressure from polymer brushes prevented membrane wrapping.
• Inter-brush repulsion destabilized nanoparticle dimerization, preventing close-packed clustering.
• Achieved suppression of clustering and endocytosis over a range of polymer molecular weights and grafting densities.

Conclusions:

• Surface modification into Janus particles offers a strategy to control nanoparticle self-assembly.
• This approach allows for tunable, non-close-packed nanoparticle assemblies.
• The findings enable reliable self-assembly for various nanotechnology applications.