Spontaneous Spreading of a Droplet: The Role of Solid Continuity and Advancing Contact Angle

Youhua Jiang, Yujin Sun, Jaroslaw W. Drelich*, Chang Hwan Choi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Spontaneous spreading of a droplet on a solid surface is poorly understood from a macroscopic level down to a molecular level. Here, we investigate the effect of surface topography and wettability on spontaneous spreading of a water droplet. Spreading force is measured for a suspended droplet that minimizes interference of kinetic energy in the spontaneous spreading during its contact with solid surfaces of discontinuous (pillar) and continuous (pore) patterns with various shapes and dimensions. Results show that a droplet cannot spread spontaneously on pillared surfaces regardless of their shapes or dimensions because of the solid discontinuity. On the contrary, a droplet on pored surfaces can undergo spontaneous spreading whose force increases with a decrease in the advancing contact angle. Theoretical models based on both the system free energy and capillary force along the contact line validate the direct and universal dependency of the spontaneous spreading force on the advancing contact angle.

Original languageEnglish
Pages (from-to)4945-4951
Number of pages7
JournalLangmuir
Volume34
Issue number17
DOIs
StatePublished - 1 May 2018
Externally publishedYes

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