Meniscus and viscous forces during separation of hydrophilic and hydrophobic smooth/rough surfaces with symmetric and asymmetric contact angles

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Shaobiao Cai, Bharat Bhushan

Abstract

Adhesive or repulsive forces contributed by both meniscus and viscous forces can be significant and become one of the main reliability issues when the contacting surfaces are ultra smooth, and the normal load is small, as is common for micro/nano devices. In this study, both meniscus and viscous forces during separation for smooth and rough hydrophilic and hydrophobic surfaces are studied. The effects of separation distance, initial meniscus height, separation time, contact angle and roughness are presented. Meniscus force decreases with an increase of separation distance, whereas the viscous force has an opposite trend. Both forces decrease with an increase of initial meniscus height. An increase of separation time, initial meniscus height or a decrease of contact angle leads to an increase of critical meniscus area at which both forces are equivalent. An increase in contact angle leads to a decrease of attractive meniscus force but an increase of repulsive meniscus force (attractive or repulsive dependent on hydrophilic or hydrophobic surface, respectively). Contact angle has a limited effect on the viscous force. For asymmetric contact angles, the magnitude of the meniscus force and the critical meniscus area are in between ...Continue Reading

References

Aug 4, 2006·Nature·Seema SinghC Jeffrey Brinker
Nov 21, 2007·Nanotechnology·Shaobiao Cai, Bharat Bhushan

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Citations

Mar 3, 2015·Proceedings of the National Academy of Sciences of the United States of America·Liming Wang, Thomas J McCarthy
Jul 15, 2016·Physical Review. E·M SedighiG Palasantzas
Mar 1, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Yongsheng Leng
Nov 22, 2008·Advances in Colloid and Interface Science·Hans-Jürgen Butt, Michael Kappl

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