Contact angle (CA) characterization of sensor materials. (IMAGE)

Beijing Institute of Technology Press Co., Ltd

Contact angle (CA) characterization of sensor materials.

Caption

(A) Schematic of CA definitions: θ (surface parallel), θa (advancing), and θr (receding) on a 90° inclined plane. CAs provide insights into hydrophilicity and wettability. (B) Sensor materials: CNTF sponge (CA 146.2°) is highly water-repellent; unmodified ISM (CA 90°) shows partial wetting; reference electrode (CA 127.2°) is hydrophobic but mimics rose petal adhesion. (C) Rose petal analysis: Side A has 1-μm wrinkles with submicrometer gaps; Side B features 8-μm spikes in a 30-μm honeycomb pattern. Despite hydrophobic CA, hysteresis highlights complex wetting behavior.

Credit

Marc Josep Montagut Marques, Waseda University.

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