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Microbubble Fabrication of Concave-porosity PDMS Beads
Published on: December 15, 2015
Quantitative analysis of spherical microbubble cavity array formation in thermally cured polydimethylsiloxane for use
Ut-Binh T Giang1, Meghan C Jones, Matthew J Kaule
1Department of Biomedical Engineering, University of Rochester, Rochester, NY, USA.
Biomedical Microdevices
|September 17, 2013
Summary
Uniform microbubble arrays for cell culture are fabricated using gas expansion molding. This technique enables precise control over cavity size and formation efficiency for high-throughput applications.
Area of Science:
- Materials Science
- Biotechnology
- Microfabrication
Background:
- Microbubbles are spherical cavities in polydimethylsiloxane (PDMS).
- Fabrication of uniform microbubble arrays is crucial for high-throughput cell culture and sorting.
- Existing methods require optimization for large-area, uniform cavity formation.
Purpose of the Study:
- To quantitatively analyze fabrication parameters influencing microbubble cavity formation efficiency and size.
- To define parameters for fabricating large-format, uniform microbubble arrays.
- To demonstrate the utility of microbubble arrays in single-cell analysis of cellular heterogeneity.
Main Methods:
- Gas expansion molding technique using PDMS and silicon wafer molds with etched pits.
- Systematic variation of fabrication parameters: mold coating, pit dimensions, spatial arrangement, PDMS curing temperature, PDMS thickness, and residual gas composition.
- Quantitative analysis of microbubble cavity formation efficiency and size distribution.
Main Results:
- Microbubble formation is governed by heterogeneous nucleation and gas diffusion principles.
- Surface tension plays a role in preventing vapor bubble detachment.
- Identified key parameters enabling fabrication of large-format arrays (over 6 in²) with uniform cavity size (CV <10%).
Conclusions:
- Optimized fabrication parameters allow for the creation of large-area, uniform microbubble arrays.
- The unique architecture of microbubble cavities is advantageous for cell culture applications.
- Microbubble cavity arrays are a versatile tool for dissecting cellular heterogeneity at the single-cell level, demonstrated with a cutaneous squamous cell carcinoma cell line.
