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One-step micromolding of complex 3D microchambers for single-cell analysis.
Hiroaki Suzuki1, Kenta Mitsuno1, Katsuyuki Shiroguchi2
1Department of Precision Mechanics, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan. suzuki@mech.chuo-u.ac.jp.
Lab on a Chip
|February 3, 2017
Summary
This study demonstrates successful replication of complex 3D microchambers using polydimethylsiloxane (PDMS) and micro stereolithography. The developed mathematical model aids in predicting stress during demolding, ensuring device integrity for applications like single-cell analysis.
Area of Science:
- Materials Science
- Biotechnology
- Microfluidics
Background:
- Replicating intricate microstructures is crucial for advanced microfluidic devices.
- Polydimethylsiloxane (PDMS) is a versatile elastomer for microfabrication.
- Micro stereolithography enables the creation of complex master molds.
Purpose of the Study:
- To assess the replicability of PDMS microchamber devices from 3D micro stereolithography-fabricated master molds.
- To develop a mathematical model for predicting demolding stress in microfabrication.
- To evaluate the utility of the fabricated microchambers for single-cell applications and enzyme assays.
Main Methods:
- Fabrication of master molds with complex 3D structures using micro stereolithography.
- Replication of microchamber devices using polydimethylsiloxane (PDMS) via soft lithography.
- Mathematical modeling to estimate stress during the demolding process.
- Experimental testing of microchambers for single-cell trapping and enzyme assays.
Main Results:
- High fidelity transfer of complex, reversely tapered microstructures (diameter ratio ~5) from master molds to PDMS.
- Successful development of a mathematical model to predict demolding stress.
- Demonstrated applicability of the PDMS microchambers for precise single-cell trapping.
- Validated the use of the microchambers for performing enzyme assays.
Conclusions:
- PDMS microchambers can be reliably replicated from complex 3D master molds fabricated by micro stereolithography.
- The developed mathematical model provides valuable insights into the demolding process, preventing device failure.
- These microchambers are suitable for advanced biological applications, including single-cell analysis and biochemical assays.
