Authors Welzel, P. ; Rauwolf, C. ; Yudin, A. ; Grundke, K.
Title Influence of Aqueous Electrolytes on the Wetting Behavior of Hydrophobic Solid Polymers - Low-Rate Dynamic Liquid/Fluid Contact Angle Measurements Using Axisymmetric Drop Shape Analysis
Date 25.09.2002
Number 10135
Abstract The interaction of inorganic ions with low-energy hydrophobic surfaces was examined using model systems of solid polymers without ionizable functional surface groups in aqueous electrolyte solutions. Low-rate dynamic contact angle measurements with captive bubbles in conjunction with axisymmetric drop shape analysis (ADSA) were performed to study the influence of electrolyte ions (in the aqueous test solutions) on the wettability of the polymers. When various types of ions were used, no significant change in advancing and receding contact angles was observed. The contact angle hysteresis was small. The zeta potential of the model polymers in aqueous electrolyte solutions was determined from streaming potential measurements. The variation of the zeta potential at different pH levels indicates preferential adsorption of hydroxyl ions at this interface. However, the presence of electrolytes at the interface between water and the different model polymers did not influence the macroscopic contact angle. The results may suggest the absence of any specific interaction between the ions and the solid polymer, as this should result in changes of hydrophobicity. Similar to the air/water interface, the composition and the potential of the polymer/water interface are obviously determined predominantly by the aqueous phase with only slight influence from the solid phase.
Publisher Journal of Colloid and Interface Science
Wikidata Q81486208
Citation Journal of Colloid and Interface Science 252 (2002) 101-108
Tags wetting electrolyte ions polymer surfaces axisymmetric drop shape analysis contact angle captive bubble zeta potential surface tensions bubble coalescence water ions adsorption polyethylene ionization forces layers films

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