Direct observation of internal fluidity in a water droplet during sliding on hydrophobic surfaces

Munetoshi Sakai; Jeong Hwan Song; Naoya Yoshida; Shunsuke Suzuki; Yoshikazu Kameshima; Akira Nakajima

doi:10.1021/la060323u

Direct observation of internal fluidity in a water droplet during sliding on hydrophobic surfaces

Munetoshi Sakai, Jeong Hwan Song, Naoya Yoshida, Shunsuke Suzuki, Yoshikazu Kameshima, Akira Nakajima

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

96 Citations (Scopus)

Abstract

In the current study, we used a high-speed camera system with particle image velocimetry to observe the internal fluidity of water droplets during sliding. The droplets' velocity during sliding was controlled by slipping and rolling motions. On the superhydrophobic surface, with a contact angle of 150°, the droplet fell at high velocity by slipping. However, on a normal hydrophobic surface whose water contact angle was around 100°, both slipping and rolling controlled the droplet's velocity during sliding. In addition, the advancing velocity might be large when the slip velocity is large and the contact area is small.

Original language	English
Pages (from-to)	4906-4909
Number of pages	4
Journal	Langmuir
Volume	22
Issue number	11
DOIs	https://doi.org/10.1021/la060323u
Publication status	Published - May 23 2006
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la060323u

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AU - Sakai, Munetoshi

AU - Song, Jeong Hwan

AU - Yoshida, Naoya

AU - Suzuki, Shunsuke

AU - Kameshima, Yoshikazu

AU - Nakajima, Akira

PY - 2006/5/23

Y1 - 2006/5/23

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AB - In the current study, we used a high-speed camera system with particle image velocimetry to observe the internal fluidity of water droplets during sliding. The droplets' velocity during sliding was controlled by slipping and rolling motions. On the superhydrophobic surface, with a contact angle of 150°, the droplet fell at high velocity by slipping. However, on a normal hydrophobic surface whose water contact angle was around 100°, both slipping and rolling controlled the droplet's velocity during sliding. In addition, the advancing velocity might be large when the slip velocity is large and the contact area is small.

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Direct observation of internal fluidity in a water droplet during sliding on hydrophobic surfaces

Abstract

ASJC Scopus subject areas

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