Mr. Ryohei Sakamoto Profile

Ryohei Sakamoto

Graduate Student at Ritsumeikan Univ

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Proceedings Article | 9 January 2008 Paper

Design and fabrication process of a micropump using bulk Pb(Zr,Ti)O3 for microfluidic devices

Ryohei Sakamoto, Van Thanh Dau, Dzung Viet Dao, Katsuhiko Tanaka, Susumu Sugiyama

Proceedings Volume 6800, 680022 (2008) https://doi.org/10.1117/12.759548

KEYWORDS: Ferroelectric materials, Silicon, Actuators, Microfluidics, Gold, Aluminum, Etching, Photomasks, Semiconducting wafers, Device simulation

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This paper reports on the design and simulation of a new valve-less pump for use in microfluidic applications. The simple-structure micropump comprises a piezoelectric Pb(Zr,Ti)O₃ (PZT) - Si diaphragm and flow channels which are fabricated using silicon micromachining techniques. The silicon diaphragm (5×5×0.05mm³) is driven by the PZT (45-μm thick) actuator that has quick response time and large driving force with low power consumption. A key technology to realize the pump diaphragm is the PZT-Si bonding process using a thin gold film as an intermediate layer. Under fabrication conditions of 550°C and 0.8 MPa, the strength of the bonding was experimentally validated to be 13 MPa. The maximum displacement of the diaphragm was measured to be 3 μm_0-P with driving voltage of 30 V_p-p at resonance frequency of 10 kHz. Structural analysis of the diaphragm was done in terms of three-dimensional model using commercial software ANSYS. The flow channels are easily fabricated by silicon etching process. Design of flow channels focused on a cross junction formed by neck of the pump chamber, one outlet and two opposite inlet channels. This structure allows a difference in fluidic resistance and fluidic momentum to be created inside the channels during each pump vibration cycle. Two designs of the devices which have different channel depths, namely type A and type B, was investigated. Flow simulation was done by numerical transient model (using ANSYS-Fluent), in which only the measured deformation of the PZT diagram is applied and therefore no other assumptions are required. The results showed that the mass flow rate of the type A is 0.129×10^-6 kg/s (mean flow rate of 6.3 ml/min) and that of type B is 1.65×10^-6 kg/s (mean flow rate of 80.8 ml/min).

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