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Advances in Materials Science and Engineering
Volume 2014, Article ID 198620, 8 pages
Research Article

A Novel Approach to Measure the Hydraulic Capacitance of a Microfluidic Membrane Pump

Department of Mechanical Engineering, National Taiwan University, No. 1, Roosevelt Road, Section 4, Taipei 10617, Taiwan

Received 15 January 2014; Revised 6 May 2014; Accepted 15 May 2014; Published 1 June 2014

Academic Editor: Jun Liu

Copyright © 2014 Chun-Hui Wu et al. 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.


A novel approach was proposed to measure the hydraulic capacitance of a microfluidic membrane pump. Membrane deflection equations were modified from various studies to propose six theoretical equations to estimate the hydraulic capacitance of a microfluidic membrane pump. Thus, measuring the center deflection of the membrane allows the corresponding pressure and hydraulic capacitance of the pump to be determined. This study also investigated how membrane thickness affected the Young’s modulus of a polydimethylsiloxane (PDMS) membrane. Based on the experimental results, a linear correlation was proposed to estimate the hydraulic capacitance. The measured hydraulic capacitance data and the proposed equations in the linear and nonlinear regions qualitatively exhibited good agreement.