Topological Control of Polystyrene-Silica Core-Shell Microspheres
Zane A Grady1, Alexandria Z Arthur1, Christopher J Wohl2
1NASA Internships, Fellowships, and Scholars, NASA Langley Research Center, Hampton, VA 23681, USA.
Colloids and Surfaces. A, Physicochemical and Engineering Aspects
|January 22, 2021
Summary
Researchers controllably modified silica-coated polystyrene microspheres, creating smooth and raspberry-like surfaces. This facile sol-gel method offers a versatile platform for diverse applications using these core-shell particles.
Area of Science:
- Materials Science
- Nanotechnology
- Colloid Chemistry
Background:
- Controllable surface morphology is crucial for numerous applications.
- Silica-coated polystyrene microspheres are widely used, but facile surface modification is challenging.
Purpose of the Study:
- To develop a method for controllably modifying the surface morphology of silica-coated polystyrene microspheres.
- To generate both smooth and raspberry-like surfaces from a single polystyrene template.
Main Methods:
- Silica shells were deposited onto polystyrene spheres using a sol-gel process with tetraethyl orthosilicate.
- Reaction conditions (silica precursor concentration, catalyst concentration) and electrostatic interactions were varied.
- Cationic polymeric brushes were used to alter surface interactions.
Main Results:
- A range of surface topologies, from smooth to raspberry-like, were successfully generated.
- Silica shell thickness ranged from 100 to 200 nm.
- Empirical relations between reaction conditions and colloid diameter were established to understand topology.
Conclusions:
- A facile and versatile method for creating tunable silica-shell polystyrene microspheres was developed.
- The method utilizes readily available materials and a single polystyrene template.
- This provides a valuable platform for research in applications utilizing these core-shell particles.
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