Design and experiment of twin plate device based on electrowetting-on-dielectric actuation

doi:10.3969/j.issn.0253-2778.2018.11.010

Abstract

Abstract: Digital microfluidics based on electrowetting on dielectric is an emerging popular technology that manipulates single droplets. It has shown enormous advantages in biology, medicine and chemistry and so on, where it has been used extensively. However, the higher driving voltage of digital microfluidic devices not only causes the dielectric layer of the chip to be broken down, but the strong electric field can cause irreversible damage to the active material in the droplet. Therefore, it is necessary to reduce the driving voltage of the digital microfluidic device. Compared with the two plate structure, the twin plate device composed of two identical coplanar electrodes was obtained by theoretical analysis, which can not only achieve greater driving force, but also lower the threshold driving voltage. The experimental results demonstrate that the twin plate structure can improve the average velocity of droplets and reduce the driving voltage effectively. Especially, in the lower driving voltage a better droplet driving effect can be obtained with the twin plate structure.

Key words: digital microfluidics, electrowetting on dielectric, driving voltage, average droplet velocity

CLC Number:

TH69

XU Xiaowei, ZHANG Yuliang. Design and experiment of twin plate device based on electrowetting-on-dielectric actuation[J]. Journal of University of Science and Technology of China, 2018, 48(11): 943-948.

References

［1］
ABDELGAWAD M, WHEELER A R. The digital revolution: A new paradigm for microfluidics[J]. Advanced Materials, 2010, 21 (8): 920-925.
[2] JEON J H, LEE J H, LEE J J, et al. Structural basis for carbapenem-hydrolyzing mechanisms of carbapenemases conferring antibiotic resistance[J]. International Journal of Molecular Sciences, 2015, 16 (5): 9654.
[3] YU Y H, CHEN J F, ZHOU J. Parallel-plate lab-on-a-chip based on digital microfluidics for on-chip electrochemical analysis[J]. Journal of Micromechanics & Microengineering, 2014, 24 (1): 015020.
[4] SHEN H H, FAN S K, KIM C J, et al. EWOD microfluidic systems for biomedical applications[J]. Microfluidics & Nanofluidics, 2014, 16 (5): 965-987.
[5] CHEN T, DONG C, GAO J, et al. Natural discharge after pulse and cooperative electrodes to enhance droplet velocity in digital microfluidics[J]. Aip Advances, 2014, 4(4): 1725.
[6] JAIN V, RAJ T P, DESHMUKH R, et al. Design, fabrication and characterization of low cost printed circuit board based EWOD device for digital microfluidics applications[J]. Microsystem Technologies, 2015, 21: 1-9.
[7] MADISON A C, ROYAL M W, FAIR R B. Fluid transport in partially shielded electrowetting on dielectric digital microfluidic devices[J]. Journal of Microelectromechanical Systems, 2016, 25 (4): 593-605.
[8] LI Y, BAKER R J, RAAD D. Improving the performance of electrowetting on dielectric microfluidics using piezoelectric top plate control[J]. Sensors & Actuators B Chemical, 2016, 229: 63-74.
[9] AHMADI A, HOLZMAN J F, NAJJARAN H, et al. Electrohydrodynamic modeling of microdroplet transient dynamics in electrocapillary-based digital microfluidic devices[J]. Microfluidics & Nanofluidics, 2011, 10 (5): 1019-1032.
[10] XU X, SUN L, CHEN L, et al. Electrowetting on dielectric device with crescent electrodes for reliable and low-voltage droplet manipulation[J]. Biomicrofluidics, 2014, 8 (6): 064107.
[11] ZENG Z, ZHANG K, WANG W, et al. Portable electrowetting digital microfluidics analysis platform for chemiluminescence sensing[J]. IEEE Sensors Journal, 2016, 16 (11): 4531-4536.
[12] VERGAUWE N, WITTERS D, CEYSSENS F, et al. A versatile electrowetting-based digital microfluidic platform for quantitative homogeneous and heterogeneous bio-assays[J]. Journal of Micromechanics & Microengineering, 2011, 21 (5): 054026.
[13] BASOVA E Y, FORET F. Droplet microfluidics in (bio)chemical analysis[J]. Analyst, 2015, 140: 22-38.
[14] ZHANG Z, HITCHCOCK C, KARLICEK R F. 3D model for rectangular electrowetting lens structures[J]. Applied Optics, 2016, 55 (32): 9113.
[15] BINDIGANAVALE G S, YOU S, MOON H. Study of hotspot cooling using electrowetting on dielectric digital microfluidic system[C]//Proceeding of the IEEE International Conference on Micro Electro Mechanical Systems. IEEE, 2014: 1039-1042.
[16] TRLS A, CLARA S, JAKOBY B. A low-cost viscosity sensor based on electrowetting on dielectrics (EWOD) forces[J]. Sensors & Actuators A Physical, 2016, 244: 261-269.
[17] CHANG J H, CHOI D Y, HAN S, et al. Driving characteristics of the electrowetting-on-dielectric device using atomic-layer-deposited aluminum oxide as the dielectric[J]. Microfluidics & Nanofluidics,2010, 8 (2): 269-273.
[18] CHEN J, YU Y, ZHANG K, et al. Study of cyanoethyl pullulan as insulator for electrowetting[J]. Sensors & Actuators B Chemical, 2014, 199 (199): 183-189.
[19] SOHAIL S, MISTRI E A, KHAN A, et al. Fabrication and performance study of BST/Teflon nanocomposite thin film for low voltage electrowetting devices[J]. Sensors & Actuators A Physical, 2016, 238: 122-132.
[20] CHANG J, PAK J J. Twin-plate electrowetting for efficient digital microfluidics[J]. Sensors & Actuators B Chemical, 2011, 160 (1): 1581-1585.
[21] SAMAD M F, KOUZANI A Z. Design and analysis of a low actuation voltage electrowetting-on-dielectric microvalve for drug delivery applications[C]// Engineering in Medicine and Biology Society. IEEE, 2014: 4423-4426.
[22] SONG J H, EVANS R, LIN YY, et al. A scaling model for electrowetting-on-dielectric microfluidic actuators[J]. Microfluidics &Nanofluidics, 2009, 7 (1): 75-89.

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