A Simple Approach for Local Contact Angle Determination on a Heterogeneous Surface

Jinbo Wu, Mengying Zhang, Xiang Wang, Shunbo Li, Weijia Wen

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

We report a simple approach for measuring the local contact angle of liquids on a heterogeneous surface consisting of intersected hydrophobic and hydrophilic patch arrays, specifically by employing confocal microscopy and the addition of a very low concentration of Rhodamine-B (RB) (2 × 10 -7 mol/L). Interestingly, RB at that concentration was found to be aggregated at the air-liquid and solid (hydrophobic patch only)-liquid interfaces, which helps us to distinguish the liquid and solid interfaces as well as hydrophobic and hydrophilic patches by their corresponding fluorescent intensities. From the measured local contact angles, the line tension can be easily derived and the value is found to be (-2.06-1.53) × 10-6 J/m. © 2011 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)5705-5708
Number of pages4
JournalLangmuir
Volume27
Issue number10
DOIs
StatePublished - May 17 2011
Externally publishedYes

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