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Surface Energy of Solids: Selection of Effective Substrates for Bioadhesion in Aqueous Media

Boniewicz-Szmyt Katarzyna, Pogorzelski Stanisław

Scientific Journal of Gdynia Maritime University

2019

nr 112

7--22

Surface wettability of model solids of different hydrophobicity (from hydrophilic to hydrophobic) in contact with an aqueous medium was determined by measuring the dynamic contact angles (CA) using common techniques: sessile drop, inclined plate and captive bubble. The surface wettability energetics parameters: contact angle hysteresis (CAH), 2D adhesive layer pressure, surface free energy (SFE) and work values of cohesion, adhesion and spreading were determined using the formalism proposed by Chibowski [2003]. CA values depended on the technique used and experimental conditions (flow numbers, spatial heterogeneity and roughness of the sample). The most effective substrates for testing bioadhesion on solids submerged in aqueous media were hydrophilic surfaces (SFE ~ 40–58 mJ m-2; CAH ~ 16–20 mN m-1).