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Autophobicity-driven surface segregation and patterning of core-shell microgel nanoparticles.

Bin Wei¹, Paul A Gurr, Arif O Gozen

¹Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.

|August 9, 2008

Summary

Core-shell microgel nanoparticles migrate to the surface of poly(methyl methacrylate) films. Adding a polystyrene cap allows nanoparticles to emerge, enabling reversible surface patterning for nanolithography.

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Area of Science:

Polymer Science
Materials Science
Nanotechnology

Background:

Core-shell microgel (CSMG) nanoparticles, or core-cross-linked star (CCS) polymers, act as cross-linked block copolymer micelles.
These structures offer potential for chemical functionalization, templating, and encapsulation.

Purpose of the Study:

Investigate the behavior of CSMG nanoparticles with poly(methyl methacrylate) (PMMA) shells within molten PMMA thin films.
Explore methods to control nanoparticle migration and surface emergence.

Main Methods:

Studied CSMG nanoparticles in molten PMMA thin films.
Utilized a polystyrene (PS) capping layer on PMMA thin films containing CSMG nanoparticles.
Employed thermal treatment to observe nanoparticle behavior.

Main Results:

CSMG nanoparticles migrated to the PMMA film surface due to autophobicity but were hindered by high PMMA surface energy.
A PS capping layer significantly reduced the energy barrier, allowing nanoparticle emergence from the PMMA bulk.
The nanoscale emergence process was observed to be reversible and controllable.

Conclusions:

The emergence of CSMG nanoparticles from polymer films can be controlled by modifying surface energy with capping layers.
This reversible nanoscale process provides a novel method for surface patterning and functionalization.
Potential applications include responsive nanolithography and tailored polymer surface modification.