Patterning of Polymer-Functionalized Nanoparticles with Varied Surface Mobilities of Polymers

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Polymer-functionalized nanoparticles are created by tethering or grafting polymers.
• The impact of polymer ligand surface mobility on nanoparticle surface patterns is not well understood.

Purpose of the Study:

• To investigate the influence of lateral polymer mobility on the surface patterning of polymer-functionalized nanoparticles.
• To elucidate the relationship between polymer mobility and the formation of striped and patchy patterns.

Main Methods:

• Utilized self-consistent field theory calculations.
• Modeled polymer-functionalized nanoparticles with both immobile and mobile polymer brushes.

Main Results:

• The fraction of mobile brushes significantly impacts surface patterning, beyond nanoparticle radius and grafting density.
• Decreasing mobile brushes increases the number of patches, driven by immobile brush entropy.
• Broken symmetry in patchy nanoparticles arises from the interplay of enthalpic and entropic effects.

Conclusions:

• Lateral polymer mobility is a key factor in determining surface patterns on polymer-functionalized nanoparticles.
• Findings provide fundamental insights into nanopattern formation and can guide the synthesis of diverse nanopatterns, including asymmetric ones.