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Micromachines 2016, 7(5), 92;

Characterizing the Deformation of the Polydimethylsiloxane (PDMS) Membrane for Microfluidic System through Image Processing

1,‡,* , 1,‡
Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
Department of Biology, South University of Science and Technology of China, Shenzhen 518055, China
The State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China
The Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China
This paper is an extended version of our paper presented in the 17th Annual Conference of the Chinese Society of Micro-Nano Technology, Shanghai, China, 11–14 October 2015.
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Andreas Richter
Received: 1 March 2016 / Revised: 11 April 2016 / Accepted: 3 May 2016 / Published: 16 May 2016
(This article belongs to the Special Issue Polymeric Microsystems)
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Polydimethylsiloxane (PDMS) membranes have been widely used in the microfluidic community to achieve various functions such as control, sensing, filter, etc. In this paper, an experimental process was proposed to directly characterize the deformation of the on-chip PDMS membrane at large deformation based on the image processing method. High precision pressures were applied on the surface of the PDMS membrane with fixed edges and a series deformation of the PDMS membrane were captured by the imaging system. The Chan and Vese (CV) level set method was applied to segment the images of the deformed membrane. The volumes wrapped by the deformed membranes were obtained, and pressure-volumes relationships of the PDMS membranes with different geometry parameters were also calculated. Then the membrane capacitance can be derived by differentiating the curve of pressure-volumes. In addition, the theoretical estimation of the capacitance of the PDMS membrane at large deformation was also obtained through finite element simulation (FEM), which was in good agreement with the experimental results. These results are expected to be significant for designing and on-chip measuring of such PDMS membrane based microfluidic components in our future work. View Full-Text
Keywords: microfluidic; PDMS membrane; level set; image processing; capacitance microfluidic; PDMS membrane; level set; image processing; capacitance

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Qian, X.; Zhang, W.; Peng, C.; Liu, X.; Yu, Q.; Ni, K.; Wang, X. Characterizing the Deformation of the Polydimethylsiloxane (PDMS) Membrane for Microfluidic System through Image Processing. Micromachines 2016, 7, 92.

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