An equilibrium phase diagram of drops at the bottom of a fiber standing on superhydrophobic flat surfaces

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Title:	An equilibrium phase diagram of drops at the bottom of a fiber standing on superhydrophobic flat surfaces
Authors:	曹恆光;Liang, Yu-En;Chang, Cheng-Chung;Tsao, Heng-Kwong;Sheng, Yu-Jane
Contributors:	工學院化學工程與材料工程學系
Keywords:	Asymmetry;Axisymmetric;Contact angle;Droplets;Gravitation;Nanostructure;Phase diagrams;Planes
Date:	2013-11-07
Issue Date:	2026-04-21 14:16:32 (UTC+8)
Publisher:	Royal Society of Chemistry
Abstract:	摘要： Droplet-on-fiber is commonly seen and the drop at the bottom of a rigid fiber standing vertically on a flat surface is closely related to dip-pen nanolithography. A combined approach of numerical simulation and experimental observation is conducted to investigate the equilibrium shape of a drop-on-fiber/plane system. For superhydrophobic surfaces, the equilibrium geometrical shape of the drop adopts either axisymmetric barrel or asymmetric clam-shell conformation. In contrast, for hydrophilic surfaces, the equilibrium drop shape adopts either axisymmetric bell-like or asymmetric half-bell-like conformation. At the transition between the two conformations, both conformations can coexist and the multiple steady states are indicated. In this paper, the phase diagrams of drop-on-fiber/plane, that is, the plots of the droplet volume against the liquid-fiber contact angle, are established on the basis of the finite-element simulation for liquid-plane contact angles of 70° and 165°. The general features of the phase diagrams for drop-on-fiber/plane systems in the presence of gravity are similar to those of drop-on-fiber in the absence of gravity. Three regimes, barrel only (bell-like only), clam-shell only (half-bell-like only), and coexistence, can be identified. However, on superhydrophobic surfaces, the regime of clam-shell only is deflated, since the gravitational energy benefits barrel more than clam-shell. On the other hand, on hydrophilic surfaces, the regime of bell-like only prevails owing to the spreading tendency of the drop and the coexistent regime diminishes significantly. Droplet-on-fiber is commonly seen and the drop at the bottom of a rigid fiber standing vertically on a flat surface is closely related to dip-pen nanolithography. 出版日期： 2013-01-01 出處： Soft matter, 2013-01, Vol.9 (41), p.9867-9875 識別號： ISSN: 1744-683X 識別號： EISSN: 1744-6848 識別號： DOI: 10.1039/c3sm51453f
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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