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Updated: Jul 14, 2026
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A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries
Published on: January 28, 2018
Tunable two-dimensional non-close-packed microwell arrays using colloidal crystals as templates.
Zhiyu Ren1, Xiao Li, Junhu Zhang
1Key Laboratory for Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 21, 2007
Summary
Researchers developed a simple method to create poly(dimethylsiloxane) (PDMS) molds with hexagonal microwells using colloidal crystals. This technique allows control over microwell dimensions for applications like microlenses and bioanalytical microvials.
Area of Science:
- Materials Science
- Nanotechnology
- Soft Lithography
Background:
- Fabricating precise microstructures is crucial for advanced applications.
- Poly(dimethylsiloxane) (PDMS) is a versatile material for microfluidics and micro-optics.
- Controlling the arrangement and dimensions of microwells is challenging.
Purpose of the Study:
- To develop a facile and efficient method for fabricating PDMS molds with hexagonal non-close-packed (ncp) microwells.
- To investigate the factors influencing microwell depth and lattice spacing.
- To explore the potential applications of these fabricated microwells.
Main Methods:
- Fabrication of 2D ncp colloidal crystal templates using lift-up soft lithography and solvent-swelling.
- Casting PDMS prepolymer onto the colloidal crystal templates.
- Contact angle measurements to analyze PDMS wetting behavior on template surfaces.
- Characterization of microwell dimensions and arrangement.
Main Results:
- Successfully fabricated PDMS molds with hexagonal ncp microwells.
- Demonstrated that microwell depth and lattice spacing are tunable by adjusting sphere interstices and template composition.
- Wetting behavior of PDMS prepolymer on rough template surfaces explains microwell depth variations, consistent with Cassie-Baxter theory.
- PDMS molds were easily demolded and templates were reusable.
Conclusions:
- The developed method offers a controllable and efficient way to produce PDMS microwell molds.
- The technique allows for precise control over microwell dimensions and arrangement.
- Potential applications include microlenses for patterning and microvials for bioanalytical techniques.
- The method is adaptable for other materials like photopolymerizable and thermosetting resins.
