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Tong Z, Shen C, Li Q, Yin H, Mao H. Combining sensors and actuators with electrowetting-on-dielectric (EWOD): advanced digital microfluidic systems for biomedical applications. Analyst 2023; 148:1399-1421. [PMID: 36752059 DOI: 10.1039/d2an01707e] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The concept of digital microfluidics (DMF) enables highly flexible and precise droplet manipulation at a picoliter scale, making DMF a promising approach to realize integrated, miniaturized "lab-on-a-chip" (LOC) systems for research and clinical purposes. Owing to its simplicity and effectiveness, electrowetting-on-dielectric (EWOD) is one of the most commonly studied and applied effects to implement DMF. However, complex biomedical assays usually require more sophisticated sample handling and detection capabilities than basic EWOD manipulation. Alternatively, combined systems integrating EWOD actuators and other fluidic handling techniques are essential for bringing DMF into practical use. In this paper, we briefly review the main approaches for the integration/combination of EWOD with other microfluidic manipulation methods or additional external fields for specified biomedical applications. The form of integration ranges from independently operating sub-systems to fully coupled hybrid actuators. The corresponding biomedical applications of these works are also summarized to illustrate the significance of these innovative combination attempts.
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Affiliation(s)
- Zhaoduo Tong
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. .,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chuanjie Shen
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. .,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qiushi Li
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Hao Yin
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. .,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hongju Mao
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
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Trampolining of Droplets on Hydrophobic Surfaces Using Electrowetting. MICROMACHINES 2022; 13:mi13030345. [PMID: 35334639 PMCID: PMC8953513 DOI: 10.3390/mi13030345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/15/2022] [Accepted: 02/16/2022] [Indexed: 11/25/2022]
Abstract
Droplet detachment from solid surfaces is an essential part of many industrial processes. Electrowetting is a versatile tool for handling droplets in digital microfluidics, not only on plain surface but also in 3-D manner. Here, we report for the first time droplet trampolining using electrowetting. With the information collected by the real-time capacitor sensing system, we are able to synchronize the actuation signal with the spreading of the droplet upon impacting. Since electrowetting is applied each time the droplet impacts the substrate and switched off during recoiling of the droplet, the droplet gains additional momentum upon each impact and is able to jump higher during successive detachment. We have modelled the droplet trampolining behavior with a periodically driven harmonic oscillator, and the experiments showed sound agreement with theoretical predictions. The findings from this study will offer valuable insights to applications that demands vertical transportation of the droplets between chips arranged in parallel, or detachment of droplets from solid surfaces.
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Zhang Q, Zhang X, Zhang X, Jiang L, Yin J, Zhang P, Han S, Wang Y, Zheng G. A feedback-controlling digital microfluidic fluorimetric sensor device for simple and rapid detection of mercury (II) in costal seawater. MARINE POLLUTION BULLETIN 2019; 144:20-27. [PMID: 31179989 DOI: 10.1016/j.marpolbul.2019.04.063] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 04/16/2019] [Accepted: 04/25/2019] [Indexed: 06/09/2023]
Abstract
By combination of miniaturization potential of digital microfluidics (DMF) and sensitivity of fluorescence probe, an integrated sensor device has been initially constructed for mercury detection in coastal waters. The actuation feature of the detecting target, seawater droplet, which remains unclear, was basically explored. To overcome a potential risk of driven failure, induced by diversity ion ingredients in seawater, a feedback control loop was included into control system. Analyzing method for coastal waters was well established on DMF, which showed satisfied stability and selectivity in Hg sensing under high salinity condition, with the sensitivity of Hg2+ at the parts per billion level and total testing time less than 20s. With the advantages of being fast, amenable to automation and low cost, this device is promising for the formation of simple and rapid sensor device, especially for a routine monitoring and emergency detection of Hg/or other metals in coastal waters.
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Affiliation(s)
- Qian Zhang
- Chemical and Environmental Engineering Institute, Dalian University, Dalian 116622, China; Environmental Micro Total Analysis Lab, Dalian University, Dalian 116622, China
| | - Xingcai Zhang
- Department of Physics, School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States
| | - Xiaolin Zhang
- Chemical and Environmental Engineering Institute, Dalian University, Dalian 116622, China; Environmental Micro Total Analysis Lab, Dalian University, Dalian 116622, China
| | - Lan Jiang
- Chemical and Environmental Engineering Institute, Dalian University, Dalian 116622, China; Environmental Micro Total Analysis Lab, Dalian University, Dalian 116622, China
| | - Jingmei Yin
- Chemical and Environmental Engineering Institute, Dalian University, Dalian 116622, China
| | - Peng Zhang
- National Marine Environmental Monitoring Center, Dalian 116600, China; Environmental Micro Total Analysis Lab, Dalian University, Dalian 116622, China
| | - Shuang Han
- Chemical and Environmental Engineering Institute, Dalian University, Dalian 116622, China; Environmental Micro Total Analysis Lab, Dalian University, Dalian 116622, China
| | - Yunhua Wang
- Medical School, Dalian University, Dalian 116622, China; Environmental Micro Total Analysis Lab, Dalian University, Dalian 116622, China.
| | - Guoxia Zheng
- Chemical and Environmental Engineering Institute, Dalian University, Dalian 116622, China; Environmental Micro Total Analysis Lab, Dalian University, Dalian 116622, China.
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Axt B, Hsieh YF, Nalayanda D, Wang TH. Impedance feedback control of microfluidic valves for reliable post processing combinatorial droplet injection. Biomed Microdevices 2018; 19:61. [PMID: 28681238 DOI: 10.1007/s10544-017-0203-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Droplet microfluidics has found use in many biological assay applications as a means of high-throughput sample processing. One of the challenges of the technology, however, is the ability to control and merge droplets on-demand as they flow through the microdevices. It is in the interest of developing lab-on-chip devices to be able to combinatorically program additive mixing steps for more complex multistep and multiplex assays. Existing technologies to merge droplets are either passive in nature or require highly predictable droplet movement for feedforward control, making them vulnerable to errors during high throughput operation. In this paper, we describe and demonstrate a microfluidic valve-based device for the purpose of combinatorial droplet injection at any stage in a multistep assay. Microfluidic valves are used to robustly control fluid flow, droplet generation, and droplet mixing in the device on-demand, while on-chip impedance measurements taken in real time are used as feedback to accurately time the droplet injections. The presented system is contrasted to attempts without feedback, and is shown to be 100% reliable over long durations. Additionally, content detection and discretionary injections are explored and successfully executed.
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Affiliation(s)
- Brant Axt
- Department of Biomedical Engineering, Johns Hopkins University, 3400 N. Charles Street, Clark Hall 118B, Baltimore, MD, 21218, USA
| | - Yi-Fan Hsieh
- Department of Mechanical Engineering, Johns Hopkins University, 3400 N. Charles Street, Shaffer Hall 200A, Baltimore, MD, 21218, USA
| | - Divya Nalayanda
- Department of Biomedical Engineering, Johns Hopkins University, 3400 N. Charles Street, Clark Hall 118B, Baltimore, MD, 21218, USA
| | - Tza-Huei Wang
- Department of Biomedical Engineering, Johns Hopkins University, 3400 N. Charles Street, Clark Hall 118B, Baltimore, MD, 21218, USA. .,Department of Mechanical Engineering, Johns Hopkins University, 3400 N. Charles Street, Shaffer Hall 200A, Baltimore, MD, 21218, USA.
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Yafia M, Emran BJ, Najjaran H. Digital Microfluidic Systems: Fundamentals, Configurations, Techniques, and Applications. MICROFLUIDICS: FUNDAMENTAL, DEVICES AND APPLICATIONS 2018:175-209. [DOI: 10.1002/9783527800643.ch5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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Samiei E, Tabrizian M, Hoorfar M. A review of digital microfluidics as portable platforms for lab-on a-chip applications. LAB ON A CHIP 2016; 16:2376-96. [PMID: 27272540 DOI: 10.1039/c6lc00387g] [Citation(s) in RCA: 195] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Following the development of microfluidic systems, there has been a high tendency towards developing lab-on-a-chip devices for biochemical applications. A great deal of effort has been devoted to improve and advance these devices with the goal of performing complete sets of biochemical assays on the device and possibly developing portable platforms for point of care applications. Among the different microfluidic systems used for such a purpose, digital microfluidics (DMF) shows high flexibility and capability of performing multiplex and parallel biochemical operations, and hence, has been considered as a suitable candidate for lab-on-a-chip applications. In this review, we discuss the most recent advances in the DMF platforms, and evaluate the feasibility of developing multifunctional packages for performing complete sets of processes of biochemical assays, particularly for point-of-care applications. The progress in the development of DMF systems is reviewed from eight different aspects, including device fabrication, basic fluidic operations, automation, manipulation of biological samples, advanced operations, detection, biological applications, and finally, packaging and portability of the DMF devices. Success in developing the lab-on-a-chip DMF devices will be concluded based on the advances achieved in each of these aspects.
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Affiliation(s)
- Ehsan Samiei
- School of Engineering, University of British Columbia, 3333 University Way, Kelowna, BC V1V 1V7, Canada.
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Schultz A, Papautsky I, Heikenfeld J. Investigation of Laplace barriers for arrayed electrowetting lab-on-a-chip. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:5349-5356. [PMID: 24738982 DOI: 10.1021/la500314v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Partial-post Laplace barriers have been postulated as a means to allow electrowetting transport and geometrical reshaping of fluids, followed by the preservation of fluid geometry after the electrowetting voltage is removed. Reported here is the first investigation of Laplace barriers with the arrayed electrodes and splitting/merging transport functions for an electrowetting lab-on-a-chip. Laplace barriers optimized for 500 × 500 μm(2) electrodes and 78 μm channel height are shown to provide geometrical control of fluid shape down to radii of curvature of ~70 μm. The Laplace barriers increase the splitting volume error, but with proper electrical control, the average error in the split volume is reduced to 5%. Improved programmable fluid storage in droplets or reservoirs and continuous channel flow are also shown. This work confirms the potential benefits of Laplace barriers for lab-on-a-chip and also reveals the unique challenges and operation requirements for Laplace barriers in lab-on-a-chip applications.
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Affiliation(s)
- A Schultz
- Department of Electrical Engineering and Computing Systems, University of Cincinnati , Cincinnati, Ohio 45221, United States
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