A magnetically driven PDMS peristaltic micropump

Abstract

We present a robust low-cost PDMS peristaltic micropump with magnetic drive. The fabrication process is based on the soft molding and bonding of three PDMS layers. A base layer incorporates the microchannel while a middle layer contains the actuation membrane. The top layer encapsulates three small permanent magnetic rods (Ni-plated-NdFeB) in three small chambers. A small DC motor (6 mm in diameter and 15 mm in length) with three permanent magnets stagger-mounted on its shaft is used to pull down and actuate the membrane-mounted magnets to generate a peristaltic waveform. A maximum pumping rate of about 24 muL/min at the speed of 1700 rpm with power consumption of 11 mW was demonstrated. A preliminary numerical analysis of the peristaltic pump was performed, which showed the characteristic membrane deflection and fluid flow of pumping.

Slip and Hall Current Effects on Jeffrey Fluid Suspension Flow in a Peristaltic Hydromagnetic Blood Micropump

“…The magnetic properties of blood and other physiological fluids have also mobilized interest in magnetohydrodynamic peristaltic pumps. These combine the flow control abilities of MHD micropumps with the biological optimization achieved with the peristaltic mechanism, as emphasized by Pan et al [25]. Tripathi and Bég [26] derived analytical solutions for transient MHD pumping with thermal diffusion in finite length channel under peristaltic waves, observing the significant regulation in velocity and pressure fields which can be achieved by combining different wave amplitudes and transverse electromagnetic body force.…”

Current micropump technologies and their biomedical applications

“…With good controllability and batchprocess capability, this type of actuator with a valve-control microfluidic chip could be applied in portable biomedical analysis apparatus. Pan et al (2004) reported a magnetically driven peristaltic micropump for lab-on-a-chip and microfluidic system shown in Fig. 8 based on the soft molding and bonding of three 250 lm PDMS layers.…”

Inertial effects on flow rate spectrum of diffuser micropumps

“…The decreasing slopes of flow rate spectrum curve in different studies also differ. References (Izzo et al 2007;Pan et al 2004;Jeong et al 2005b;Doll et al 2006;Xie et al 2003) dealt with very fast decreasing in flow rate spectrum curve whereas in references (Yamahata et al 2005;Yun et al 2002), the decreasing slopes are very slow. The differences in decreasing slope affect the frequency bandwidth of micropumps.…”

“…In other words, the frequencies, at which the maximum flow rate and maximum deflection occur, should be close. However, numerous experimental results have showed the frequency of maximum flow rate and that of maximum deflection differ (Hsu et al 2007;Izzo et al 2007;Pan et al 2004;Yamahata et al 2005;Yun et al 2002). Additionally, no theoretical explanations have been developed that account for this difference.…”