Ionic polymer–metal composite material as a diaphragm for micropump devices

Abstract The ionic polymer–metal composite (IPMC) is a new functional material that, being flexible and capable of operating in air and in liquid environments, is a new candidate for diaphragms in micropump devices. In this paper, two different IPMC diaphragms have been fabricated and experimentally tested. Their stroke volume was examined with different values of electric current supplied for each IPMC diaphragm. The novel results showed that both diaphragms have an asymmetric behaviour of their upward and downward displacements mainly imposed by the electrode layer, which becomes more brittle as the IPMC diaphragm moves up and down. Stroke volumes up to 80 μl were obtained and a flow rate of about 8.02 μl/s was achieved for an operating frequency of 0.1 Hz. The results clearly show that there are significant differences between the obtained dynamic characteristics when it is used FEM simulations to study IPMCs diaphragms and when they are experimentally test in real operating conditions.

[1]  Guoren Zhu,et al.  Development of serial-connection piezoelectric pumps , 2008 .

[2]  Nam Seo Goo,et al.  Design, fabrication, and experimental characterization of a flap valve IPMC micropump with a flexibly supported diaphragm , 2008 .

[3]  Nan-Chyuan Tsai,et al.  Review of MEMS-based drug delivery and dosing systems , 2007 .

[4]  P. Branco,et al.  Ionic polymer metal-composite (IPMC) actuators: Augmentation of their actuation force capability , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[5]  M. Richter,et al.  A bidirectional silicon micropump , 1995 .

[6]  Yoseph Bar-Cohen,et al.  Electroactive Polymer (EAP) Actuators as Artificial Muscles: Reality, Potential, and Challenges, Second Edition , 2004 .

[7]  J. Fluitman,et al.  A thermopneumatic micropump based on micro-engineering techniques , 1990 .

[8]  Hoon Cheol Park,et al.  Modeling of an IPMC Actuator-driven Zero-Net-Mass-Flux Pump for Flow Control , 2006 .

[9]  Kwang J. Kim,et al.  Design of IPMC actuator-driven valve-less micropump and its flow rate estimation at low Reynolds numbers , 2006 .

[10]  Mohsen Shahinpoor,et al.  Artificial Muscles: Applications of Advanced Polymeric Nanocomposites , 2007 .

[11]  W.J. Li,et al.  Polymer MEMS actuators for underwater micromanipulation , 2004, IEEE/ASME Transactions on Mechatronics.

[12]  Hoon Cheol Park,et al.  Equivalent modeling for ionic polymer–metal composite actuators based on beam theories , 2005 .

[13]  F Costa,et al.  Piezoelectric diaphragm for vibration energy harvesting. , 2005, Ultrasonics.

[14]  Jong-Yeon Park,et al.  Fabrication of ionic-polymer-metal-composite (IPMC) micropump using a commercial Nafion , 2004, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[15]  K. Kim,et al.  Ionic polymer–metal composites: IV. Industrial and medical applications , 2005 .

[16]  Woo Young Sim,et al.  A novel constant delivery thermopneumatic micropump using surface tensions , 2007 .

[17]  P. J. Costa Branco,et al.  Derivation of a continuum model and its electric equivalent-circuit representation for ionic polymer–metal composite (IPMC) electromechanics , 2006 .