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Title: Magnetowetting and sliding motion of a sessile ferrofluid droplet in the presence of a permanent magnet
Authors: Nguyen, Nam-Trung
Zhu, Gui-Ping
Chua, Yong Chin
Phan, Vinh-Nguyen
Tan, Say-Hwa
Keywords: DRNTU::Engineering::Mechanical engineering
Issue Date: 2010
Source: 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.
Series/Report no.: Langmuir
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.
DOI: 10.1021/la101474e
Rights: © 2010 American Chemical Society.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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