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    AC ELECTROHYDRODYNAMICS PHENOMENON IN 2D AND 3D MICROELECTRODES

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    Name:
    MasterThesis_Raphaela.pdf
    Size:
    45.62Mb
    Format:
    PDF
    Description:
    Final Thesis
    Download
    Type
    Thesis
    Authors
    Silva, Raphaela cc
    Advisors
    Salama, Khaled N. cc
    Committee members
    Salama, Khaled N. cc
    Ooi, Boon S. cc
    Thoroddsen, Sigurdur T cc
    Program
    Electrical and Computer Engineering
    KAUST Department
    Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division
    Date
    2020-07
    Embargo End Date
    2021-07-19
    Permanent link to this record
    http://hdl.handle.net/10754/664341
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2021-07-19.
    Abstract
    Alternating current electrohydrodynamics (ac-EHD) has been reported as a promising technique for enhancing sensor performance by the intimate mixing of the analyte solution at the electrode surface. The lateral fluid motion created by the ac-EHD phenomenon can be tuned by changing the frequency, voltage, and electrode geometry. To date, various studies have been conducted on the use of 2D electrodes based ac- EHD devices for sensor applications. However, the use of 3D electrodes may provide better fluid mixing as compared to the 2D electrodes due to the high surface area of the electrodes. To test this hypothesis, 2D and 3D microelectrodes with different sizes were designed and fabricated for ac-EHD studies using standard lithography and etching processes. Previous methods to achieve 3D microstructures and common issues faced during fabrication are also discussed. The lateral fluid motion created by the 2D and 3D electrodes after the application of different voltages and frequencies was analyzed by tracking the motion of fluorescent beads present in the mixing fluid. Fluorescence microscopy technique was used to capture videos of the movement of fluorescent beads in the fluid. The videos were analyzed using ImageJ to calculate the speed of fluorescent beads in the case of 2D and 3D electrodes. Furthermore, a different pattern of the fluid motion was observed in the case of 3D electrodes, which highlights the complex fluid movement in the case of 3D electrodes as compared to the 2D electrodes.
    Citation
    Silva, R. (2020). AC ELECTROHYDRODYNAMICS PHENOMENON IN 2D AND 3D MICROELECTRODES. KAUST Research Repository. https://doi.org/10.25781/KAUST-SCUZ4
    DOI
    10.25781/KAUST-SCUZ4
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-SCUZ4
    Scopus Count
    Collections
    MS Theses; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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