Solute concentration-dependent contact angle hysteresis and evaporation stains

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Title:	Solute concentration-dependent contact angle hysteresis and evaporation stains
Authors:	曹恆光;Li, Yueh-Feng;Sheng, Yu-Jane;Tsao, Heng-Kwong
Contributors:	工學院化學工程與材料工程學系
Keywords:	additives;contact angle;dextran;evaporation;hysteresis;liquids;polyethylene glycol;sodium;solutes
Date:	2014-07-08
Issue Date:	2026-04-21 14:27:23 (UTC+8)
Publisher:	American Chemical Society;United States: American Chemical Society
Abstract:	摘要： The presence of nonvolatile solutes in a liquid drop on a solid surface can affect the wetting properties. Depending on the surface-activity of the solutes, the extent of contact angle hysteresis (CAH) can vary with their concentration and the pattern of the evaporation stain is altered accordingly. In this work, four types of concentration-dependent CAH and evaporation stains are identified for a water drop containing polymeric additives on polycarbonate. For polymers without surface-activity such as dextran, advancing and receding contact angles (θ a and θ r ) are independent of solute concentrations, and a concentrated stain is observed in the vicinity of the drop center after complete evaporation. For polymers with weak surface-activity such as poly(ethylene glycol) (PEG), both θ a and θ r are decreased by solute addition, and the stain pattern varies with increasing PEG concentration, including a concentrated stain and a mountain-like island. For polymers with intermediate surface-activity such as sodium polystyrenesulfonate (NaPSS), θ a descends slightly, but θ r decreases significantly after the addition of a substantial amount of NaPSS, and a ring-like stain pattern is observed. Moreover, the size of the ring stain can be controlled by NaPSS concentration. For polymers with strong surface-activity such as poly(vinylpyrrolidone) (PVP), θ a remains essentially a constant, but θ r is significantly lowered after the addition of a small amount of PVP, and the typical ring-like stain is seen. 其他題名： Langmuir 出版者： United States: American Chemical Society 出版日期： 2014-07-08 出處： Langmuir, 2014-07, Vol.30 (26), p.7716-7723 資源來源： American Chemical Society Journals 識別號： ISSN: 0743-7463 識別號： ISSN: 1520-5827 識別號： EISSN: 1520-5827 識別號： DOI: 10.1021/la501438k 識別號： PMID: 24933206
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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