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A dielectrophoresis driven tunable capacitor

Li, Wenbo (2018) A dielectrophoresis driven tunable capacitor. Master's Thesis, University of Pittsburgh. (Unpublished)

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In this article, spreading dielectric fluid using two parallel electrodes is studied under increasing voltage. As fluid is drawn out by an increasing dielectrophoresis (DEP) force, phenomenon of a sudden liquid-spreading was discovered. Gibbs free energy method was used to study this phenomenon, a reasonable explanation was given on this phenomenon.
Then, electric shape influence on the sudden liquid spreading voltage was studied, electrode width and gap was utilized to design electrode shapes. Several electrode shapes have been fabricated and tested. Designed electrodes were able to drive fluid out into the electrode and back into the reservoir again. An Appropriate electrode shape has been utilized so that the fluid length to voltage relationship was nicely linear. Driving fluid in and out of the reservoir was easily controllable.
Using this new driving method, a new concept tunable capacitor is fabricated, voltage is used to drive fluid in and out of the electrode to tune capacitance. Because of the large permittivity difference, tuning range of 0.2-1.4 pF and 0.7-3.0 pF were tested and, maximum quality factor of 600 and 250 were tested.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Li, Wenbowel102@pitt.eduwel102
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairCho, Sung
Committee MemberLee,
Committee MemberChun,
Date: 20 September 2018
Date Type: Publication
Defense Date: 3 July 2018
Approval Date: 20 September 2018
Submission Date: 19 July 2018
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 41
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Mechanical Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: tunable capacitor; dielectrophoresis; micro-fluid driving
Date Deposited: 20 Sep 2018 20:09
Last Modified: 20 Sep 2020 05:15


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