Electrowetting on superhydrophobic SU-8 patterned surfaces

Dale Herbertson; Carl Evans; Neil Shirtcliffe; Glen McHale; Michael Newton

doi:10.1016/j.sna.2005.12.018

Electrowetting on superhydrophobic SU-8 patterned surfaces

Dale Herbertson, Carl Evans, Neil Shirtcliffe, Glen McHale, Michael Newton

Research output: Contribution to journal › Article › peer-review

105 Citations (Scopus)

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Abstract

Electrowetting on micro-patterned layers of SU-8 photoresist with an amorphous Teflon (R) coating has been observed. The cosine of the contact angle is shown to be proportional to the square of the applied voltage for increasing bias. However, this does not apply below 40 V and we suggest that this may be explained in terms of penetration of fluid into the pattern of the surface. Assuming that the initial application of a bias voltage converts the drop from Cassie-Baxter to Wenzel regime, we have used this as a technique to estimate the roughness factor of the surface.

Original language	English
Pages (from-to)	189-193
Journal	Sensors and Actuators A: Physical
Volume	130-1
DOIs	https://doi.org/10.1016/j.sna.2005.12.018
Publication status	Published - 14 Aug 2006

Keywords

electrowetting
EWOD
superhydrophobic

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10.1016/j.sna.2005.12.018

Postprint McHale Sens Act A vol 130 p189 2006Accepted author manuscript, 554 KB

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abstract = "Electrowetting on micro-patterned layers of SU-8 photoresist with an amorphous Teflon (R) coating has been observed. The cosine of the contact angle is shown to be proportional to the square of the applied voltage for increasing bias. However, this does not apply below 40 V and we suggest that this may be explained in terms of penetration of fluid into the pattern of the surface. Assuming that the initial application of a bias voltage converts the drop from Cassie-Baxter to Wenzel regime, we have used this as a technique to estimate the roughness factor of the surface.",

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AU - Herbertson, Dale

AU - Evans, Carl

AU - Shirtcliffe, Neil

AU - McHale, Glen

AU - Newton, Michael

PY - 2006/8/14

Y1 - 2006/8/14

N2 - Electrowetting on micro-patterned layers of SU-8 photoresist with an amorphous Teflon (R) coating has been observed. The cosine of the contact angle is shown to be proportional to the square of the applied voltage for increasing bias. However, this does not apply below 40 V and we suggest that this may be explained in terms of penetration of fluid into the pattern of the surface. Assuming that the initial application of a bias voltage converts the drop from Cassie-Baxter to Wenzel regime, we have used this as a technique to estimate the roughness factor of the surface.

AB - Electrowetting on micro-patterned layers of SU-8 photoresist with an amorphous Teflon (R) coating has been observed. The cosine of the contact angle is shown to be proportional to the square of the applied voltage for increasing bias. However, this does not apply below 40 V and we suggest that this may be explained in terms of penetration of fluid into the pattern of the surface. Assuming that the initial application of a bias voltage converts the drop from Cassie-Baxter to Wenzel regime, we have used this as a technique to estimate the roughness factor of the surface.

KW - electrowetting

KW - EWOD

KW - superhydrophobic

UR - https://www.scopus.com/pages/publications/33745860370

U2 - 10.1016/j.sna.2005.12.018

DO - 10.1016/j.sna.2005.12.018

M3 - Article

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VL - 130-1

SP - 189

EP - 193

JO - Sensors and Actuators A: Physical

JF - Sensors and Actuators A: Physical

ER -

Electrowetting on superhydrophobic SU-8 patterned surfaces

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Keywords

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