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    Novel fatty acid anion-based ionic liquids: Contact angle, surface tension, polarity fraction and spreading parameter

    Year: 2019

    Journal: J. Mol. Liq., Volume 288, AUG 15

    Authors: Blanco, D.; Rivera, N.; Oulego, P.; Diaz, M.; Gonzalez, R.; Battez, A. Hernandez

    Organizations: Spanish Ministry of Economy and Competitiveness [DPI2016-79690-R]; Foundation for the Promotion of Applied Scientific Research and Technology in Asturias (FICYT) [IDI/2018/000131]

    Keywords: Contact angle; Fatty acid ionic liquids; Polarity; Spreading parameter; Surface tension; Wetting

    This work deals with the determination of several wetting properties (contact angle, surface tension, polarity fraction and spreading parameter) of six novel fatty acid anion-based ionic liquids (FAILs): methyltrioctylammonium hexanoate [N-8881][C-6:0], methyltrioctylammonium octanoate [N-8881][C-8:01], methyltrioctylammonium laurate [N-8881][C-12:0], methyltrioctylammonium palmitate [N-8881][C-16:0], methyltrioctylammonium stearate [N-8881] [C-18:0] and methyltrioctylammonium oleate [N-8881][C-18:1]. Surface tension was determined at temperatures from 293 to 333 K, exhibiting a linear decrease within the temperature range. Contact angle measurements were performed on five different surfaces (steel, aluminum, tungsten carbide, cast iron and bronze) using 3 test liquids (water, diiodomethane and ethylenglycol) and each of the synthesized FAILS. Polarity fraction (PF) and the spreading parameter (SP) were calculated in order to gain a deeper understanding of wetting characteristics of these FAILS. Despite the similarity of the obtained results with all FAILS and surfaces, [N-8881][C-6:0] and [N-8881] [C-8:0] with both cast iron and bronze surfaces were the best surface-FAIL combinations regarding wettability. (C) 2019 Elsevier B.V. All rights reserved.
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