研究目的
To fabricate a disposable paper-based electrowetting chip platform using economical materials under a low voltage source and to study the performance of the designed disposable EW lab on a chip based on the droplet motion.
研究成果
The ?exible paper-based lab on a EW chip has ful?lled the Lippmann’s equation where the higher the voltage supply, the interfacial tension of liquid or droplet becomes lesser. The droplet is able to trail along the track of activated electrode on this ?exible paper-based lab on a EW chip using olive oil as the dielectric layer. The new electrowetting lab on a chip can be used in the study of particle science and engineering, since the droplet promises displacement under low voltage 12 Vpp and low frequency of 10 Hz electrical signal.
研究不足
The electrowetting chip can only be used up to three times maximum because the top most layer could become swollen on the ?exible paper-based lab on a chip when it is exposed to the liquid medium too long. The chip is designated to be disposable to avoid any contamination when different samples are used.
1：Experimental Design and Method Selection:
The methodology involves the fabrication of a disposable paper-based electrowetting chip platform using economical materials under a low voltage source. The electrowetting technique is employed to manipulate droplets using electrical potential.
2：Sample Selection and Data Sources:
The microdroplet samples of 5 μl from Potassium Chloride (KCl) are experimented on top of the electrodes. The conductivity used in this experiment is about 1400 μS/cm.
3：List of Experimental Equipment and Materials:
The electrode is made of a thin Aluminium (Al) ?lm, and the lab on a chip substrate is made from cellulose paper. Three types of lubricant oils (olive oil, palm oil, and mineral oil) are experimented as dielectric layers.
4：Experimental Procedures and Operational Workflow:
The droplet is initially placed in the middle between two separated planar electrodes. When the voltage is increased, the droplet starts to ?ow forward, and the displacement is measured. The voltage is measured starting from 1Vpp to observe any motion, and it is observed until the voltage reaches 13.5Vpp.
5：5Vpp.
Data Analysis Methods:
5. Data Analysis Methods: The displacement and velocity of the droplet are recorded and plotted in graphs. The measurement is done using the Olympus Stream software.
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