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Patterned Surface Energy in Elastomeric Molds as a Generalized Approach to Polymer Particle Fabrication
Samuel D Oberdick1, Gary Zabow1
1National Institute of Standards and Technology, Boulder, Colorado, and University of Colorado, Boulder, Coloradoh.
ACS Applied Polymer Materials
|September 1, 2020
Summary
This study introduces a novel method for creating custom-shaped polymer microparticles using poly(dimethylsiloxane) (PDMS) molds and UV curing. This technique enables precise control over particle formation, avoiding unwanted layers and allowing for magnetic functionalization.
Area of Science:
- Materials Science
- Polymer Chemistry
- Microfabrication
Background:
- Fabricating polymer microparticles with controlled shapes is challenging.
- Existing methods often result in interconnected structures or lack shape versatility.
Purpose of the Study:
- To develop a generic fabrication scheme for engineerable, complex-shaped polymer microparticles.
- To overcome limitations of current microparticle production methods, such as scum layer formation.
Main Methods:
- Utilized polyethylene glycol-based hydrogels and poly(dimethylsiloxane) (PDMS) molding.
- Employed a surface treatment to create surface energy contrast in PDMS molds.
- Cured hydrogel precursor with UV light to form isolated particles.
Main Results:
- Successfully fabricated well-defined, independent polymer microparticles.
- Demonstrated the elimination of interconnecting "scum" layers.
- Showcased magnetic functionalization of the produced microparticles.
Conclusions:
- The presented fabrication scheme offers a versatile approach for producing complex-shaped polymer microparticles.
- The technique is compatible with further particle modifications, expanding its applicability.
