A Simple Approach for Local Contact Angle Determination on a Heterogeneous Surface
KAUST Grant NumberSA-C0040/UK-C0016
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AbstractWe 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.
CitationWu J, Zhang M, Wang X, Li S, Wen W (2011) A Simple Approach for Local Contact Angle Determination on a Heterogeneous Surface. Langmuir 27: 5705–5708. Available: http://dx.doi.org/10.1021/la200697k.
SponsorsThis publication is based on work partially supported by Award No. SA-C0040/UK-C0016, made by King Abdullah University of Science and Technology (KAUST), Hong Kong RGC grants HKUST 603608 and 604710, respectively.
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
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