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Magnetowetting and sliding motion of a sessile ferrofluid droplet in the presence of a permanent magnet

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Magnetowetting and sliding motion of a sessile ferrofluid droplet in the presence of a permanent magnet

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dc.contributor.author Nguyen, Nam-Trung
dc.contributor.author Zhu, Gui-Ping
dc.contributor.author Chua, Yong Chin
dc.contributor.author Phan, Vinh-Nguyen
dc.contributor.author Tan, Say-Hwa
dc.date.accessioned 2012-04-12T07:32:15Z
dc.date.available 2012-04-12T07:32:15Z
dc.date.copyright 2010
dc.date.issued 2012-04-12
dc.identifier.citation Nguyen, N. T., Zhu, G., Chua, Y. C, Phan, V. N. & Tan, S. H. (2010). Magnetowetting and Sliding Motion of a Sessile Ferrofluid Droplet in the Presence of a Permanent Magnet. Langmuir, 26 (15), 12553–12559.
dc.identifier.uri http://hdl.handle.net/10220/7762
dc.description.abstract Motion of a droplet on a planar surface has applications in droplet-based lab on a chip technology. This paper reports the experimental results of the shape, contact angles, and motion of ferrofluid droplets driven by a permanent magnet on a planar homogeneous surface. The water-based ferrofluid in use is a colloidal suspension of single-domain magnetic nanoparticles. The effect of the magnetic field on the apparent contact angle of the ferrofluid droplet was first investigated. The results show that an increasing magnetic flux decreases the apparent contact angle of a sessile ferrofluid droplet. Next, the dynamic contact angle was investigated by observing the shape and the motion of a sessile ferrofluid droplet. The advancing and receding contact angles of the moving ferrofluid were measured at different moving speeds and magnetic field strengths. The measured contact angles were used to estimate the magnitude of the forces involved in the sliding motion. Scaling analysis was carried out to derive the critical velocity, beyond which the droplet is not able to catch up with the moving magnet.
dc.language.iso en
dc.relation.ispartofseries Langmuir
dc.rights © 2010 American Chemical Society.
dc.subject DRNTU::Engineering::Mechanical engineering.
dc.title Magnetowetting and sliding motion of a sessile ferrofluid droplet in the presence of a permanent magnet
dc.type Journal Article
dc.contributor.school School of Mechanical and Aerospace Engineering
dc.identifier.doi http://dx.doi.org/10.1021/la101474e

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