Four-electrode micropump with peristaltic motion

Lee, In-Soo; Hong, Pyo-Hwan; Cho, Chanseob; Lee, Byeungleul; Chun, Kyunghan; Kim, Bong-Hwan

doi:10.1016/j.sna.2016.04.010

Cited by 33 publications

(16 citation statements)

References 17 publications

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“…The pump has to be small, consume low power, and be compatible with microtechnology. The pumping mechanisms known to date include piezoelectric [11][12][13][14][15], electrostatic [16][17][18][19][20], electromagnetic [21][22][23][24][25], and thermopneumatic [26][27][28][29][30] principles. However, each of them has inherent drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Fast Electrochemical Actuator with Ti Electrodes in the Current Stabilization Regime

2022

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The actuators needed for autonomous microfluidic devices have to be compact, low-power-consuming, and compatible with microtechnology. The electrochemical actuators could be good candidates, but they suffer from a long response time due to slow gas termination. An actuator in which the gas is terminated orders of magnitude faster has been demonstrated recently. It uses water electrolysis performed by short voltage pulses of alternating polarity (AP). However, oxidation of Ti electrodes leads to a rapid decrease in the performance. In this paper, we demonstrate a special driving regime of the actuator, which is able to support a constant stroke for at least 105 cycles. The result is achieved using a new driving regime when a series of AP pulses are interspersed with a series of single-polarity (SP) pulses. The new regime is realized by a special pulse generator that automatically adjusts the amplitude of the SP pulses to keep the current flowing through the electrodes at a fixed level. The SP pulses increase the power consumption by 15–60% compared to the normal AP operation and make the membrane oscillate in a slightly lifted position.

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Section: Introductionmentioning

confidence: 99%

Fast Electrochemical Actuator with Ti Electrodes in the Current Stabilization Regime

2022

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“…This is mainly due to the large difference between the maximum voltage of standard CMOS circuits and the voltage needed to drive EOF micropumps. While MEMS micropumps based on electrostatic, piezoelectric or thermopneumatic actuators require voltages ranging from 5 V to 200 V to obtain high flow rate [30]- [33], EOF micropumps typically require voltages higher than 40 V [22], [24] up to several 100 V [23], [26], as shown in Fig. 2a.…”

Section: Introductionmentioning

confidence: 99%

On-Chip CMOS-MEMS-Based Electroosmotic Flow Micropump Integrated With High-Voltage Generator

Okamoto

Ryoson

Fujimoto

et al. 2020

J. Microelectromech. Syst.

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The rapid development of microfluidic technology has increased the demand for the integration of driving circuits in the microfluidic devices. We have proposed a novel on-chip electroosmotic (EOF) micropump integrated with a high-voltage (HV) generator. The HV (49.8 V) generator is based on a Dickson charge pump, which is fabricated on a silicon-on-insulator (SOI) substrate by the standard CMOS process, and the isolation is achieved by MEMS post-processed deep trench isolation. The size of the 49.8 V generator is 425×353 µ m 2 . The HV required for the successful operation of the micropump was generated by the integrated driving circuit with a low-voltage power supply. The maximum flow velocity and flow rate of the proposed EOF micropump were measured as 137 µ m/s and 167 nL/min, respectively when it was driven by the integrated 49.8 V generator. The efficiency of the micropump is demonstrated by comparing it with the previously reported micropumps. The proposed integration technique is reliable and effective, and potentially boosts the practical applications of lab-on-chip devices.

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“…The velocity of fluid particles at the wall equals the wall velocity due to the no-slip boundary condition; however, as we move towards the centre of the lumen, the velocity reduces. The mechanical actuation of the wall have been demonstrated in numerous systems that are driven by means of pneumatic [13–15], electrostatic [16, 17], electromagnetic [18, 19], or piezoelectric [20, 21] actuators. Diaphragms that can be actuated electrically, using two control valves have been used to regulate the flow of fluids in the channels.…”

Section: Introductionmentioning

confidence: 99%

A novel two-indenter based micro-pump for lab-on-a-chip application: modeling and characterizing flows for a non-Newtonian fluid

Avvari

2020

Preprint

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Inspired by the feeding mechanisms of a nematode, a novel two-indenter (2I) micropump is analyzed theoretically for transport and mixing of a non-Newtonian fluid for the purpose of lab-on-a-chip applications. Considering that the viscous forces dominate the flows in microscopic regime, the concept lubrication theory was adopted to device the two-dimensional flow model of the problem. By approximating the movements of the indenter as a sinusoidal function, the details of the flow were investigated for variations in -frequency of contraction of the first value keeping the second valve at higher occlusion, and occlusion. The study indicates that occlusive nature of the second valve leads to the large pressure barrier which prevents the fluid to enter into the neighboring compartment. Transport occurs as the lumen opens to develop a suction pressure. Pressure barrier is found to be highest for dilatants followed by Newtonian and pseudo-plastics. Shear stress dependency on frequency the contraction of the first value is highest for lower values of flow behavior index. In conclusion, the study provides details connecting the flows resulting from the indentation of the front-end indenter to the frequency of indentation, geometry and rheology of the fluid, thus facilitating optimal design of the micropumps.

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Four-electrode micropump with peristaltic motion

Cited by 33 publications

References 17 publications

Fast Electrochemical Actuator with Ti Electrodes in the Current Stabilization Regime

Fast Electrochemical Actuator with Ti Electrodes in the Current Stabilization Regime

On-Chip CMOS-MEMS-Based Electroosmotic Flow Micropump Integrated With High-Voltage Generator

A novel two-indenter based micro-pump for lab-on-a-chip application: modeling and characterizing flows for a non-Newtonian fluid

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