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Colloids Interfaces 2018, 2(3), 26;

Effect of Polysorbates on Solids Wettability and Their Adsorption Properties

Department of Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland
Author to whom correspondence should be addressed.
Received: 25 June 2018 / Revised: 5 July 2018 / Accepted: 6 July 2018 / Published: 8 July 2018
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The wettability of solids is important from both practical and theoretical viewpoints. In this study, we measured the contact angle of aqueous solutions of polysorbates (Tween 20, Tween 60, and Tween 80) on polytetrafluoroethylene (PTFE), polyethylene (PE), polymethyl methacrylate (PMMA), polyamide (nylon 6), and quartz. Based on the obtained results, the adsorption of Tween 20 (T20), Tween 60 (T60), and Tween 80 (T80) at the solid-water interface was determined based on the structure and size of their molecules. Next, the tendency of polysorbates to adsorb at the solid-water interface was considered based on the Gibbs standard free energy of adsorption (ΔGadso). This energy was evaluated using various methods, including a method we propose based on the critical micelle concentration (CMC) and the contact angle of water and solution at the CMC, as well as their surface tension. The ΔGadso values obtained by this method were comparable to those calculated from the Langmuir equation. Taking into account the Tweens tendency to adsorb at the solid-water interface, the measured contact angle, the components and parameters of surface tension of Tweens solutions and solids, and the surface tension of water and its Lifshitz-van der Waals component that we determined, the wetting process in the solid-solution drop-air system was analyzed. The results based on the mentioned parameters showed that it is possible to predict the wettability of apolar, monopolar, and bipolar solids using the aqueous Tweens solution and their solution adhesion. View Full-Text
Keywords: polysorbates; contact angle; polymers; quartz; adhesion polysorbates; contact angle; polymers; quartz; adhesion

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Szymczyk, K.; Zdziennicka, A.; Jańczuk, B. Effect of Polysorbates on Solids Wettability and Their Adsorption Properties. Colloids Interfaces 2018, 2, 26.

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