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Study of cyanoethyl pullulan as insulator for electrowetting.

Authors :
Chen, Jianfeng
Yu, Yuhua
Zhang, Kaidi
Wu, Chuanyong
Liu, Ai Qun
Zhou, Jia
Source :
Sensors & Actuators B: Chemical. Aug2014, Vol. 199, p183-189. 7p.
Publication Year :
2014

Abstract

Abstract: In this paper, the dielectric and electrowetting properties of cyanoethyl pullulan (CEP) are studied as the insulator in electrowetting on dielectric (EWOD) device. The CEP film is formed by spin-coating and low-temperature annealing in atmosphere. The characterization results show that CEP can serve as the dielectric of EWOD with a high dielectric constant of 18 and a great electrowetting performance when annealed at 100°C in atmosphere. The reversibility, stability, polarity-dependence, and frequency-dependence of electrowetting on CEP are fully investigated. The spin-coated CEP exhibits little polarity-related electrowetting while having better driving performance under negative-potential. Frequency-related electrowetting is more sensitive at low-frequency alternating current (AC) potentials than at high-frequency ones. It also shows reversible and stable electrowetting with a small irreversibility of 2° after a 700-cycle test. Based on the above results, an EWOD device with 1μm thick CEP dielectric layer is fabricated. The EWOD device successfully manipulates water droplet at a low driving voltage of 20V and a large velocity under low voltage of DC or AC signals with different frequencies. The easy fabrication and excellent performance of CEP qualifies it as a superior dielectric material in the future EWOD devices and lab-on-a-chip system. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
09254005
Volume :
199
Database :
Academic Search Index
Journal :
Sensors & Actuators B: Chemical
Publication Type :
Academic Journal
Accession number :
96447221
Full Text :
https://doi.org/10.1016/j.snb.2014.03.112