DocumentCode :
628876
Title :
Electrowetting-on-dielectric system based on polydimethylsiloxane
Author :
Caputo, Domenico ; de Cesare, Giampiero ; Lovecchio, Nicola ; Scipinotti, Riccardo ; Nascetti, Augusto
Author_Institution :
Dept. of Inf., Univ. of Rome La Sapienza, Roma, Italy
fYear :
2013
fDate :
13-14 June 2013
Firstpage :
99
Lastpage :
103
Abstract :
In this paper we present a detailed characterization of an electro-wetting on dielectric (EWOD) system able to move drop of liquid and to detect its position over an array of electrodes covered with a 1μm thick polydimethylsiloxane (PDMS) layer. In the presented system, the PDMS layer acts as both insulation and hydrophobic material. An electronic board controls all the signals needed for the actuation and sensing functionalities of the EWOD system. Sessile drop experiments show the saturation of the contact angle at negative bias voltage applied to the droplet. This behavior is ascribed to trapped carrier in the PDMS layer and explains the movement of the droplet toward the grounded electrode found in EWOD experiment. The procedure chosen for the drop movement achieves speed around 5cm/s with applied voltages around 200V. Detection of drop position is successfully achieved implementing the time-constant method, which evaluates the variation of electrode capacitance induced by the droplet presence on the PDMS surface corresponding to the metal electrode.
Keywords :
contact angle; dielectric liquids; drops; hydrophobicity; polymers; wetting; EWOD system; PDMS layer; actuation functionality; contact angle saturation; droplet; electrode array; electrode capacitance; electronic board; electrowetting on dielectric system; grounded electrode; hydrophobic material; insulation material; metal electrode; polydimethylsiloxane; sensing functionality; sessile drop experiment; time constant method; trapped carrier; Arrays; Capacitance; Dielectrics; Electric potential; Electrodes; Liquids; Partial discharges; Electrowetting; PDMS; microfluidic;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advances in Sensors and Interfaces (IWASI), 2013 5th IEEE International Workshop on
Conference_Location :
Bari
Print_ISBN :
978-1-4799-0039-8
Type :
conf
DOI :
10.1109/IWASI.2013.6576078
Filename :
6576078
Link To Document :
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