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

Authors: Blanco, D., Rivera, N., Oulego, P., Díaz, M., González, R. and Battez, A.H.

Journal: Journal of Molecular Liquids

Volume: 288

ISSN: 0167-7322

DOI: 10.1016/j.molliq.2019.110995

Abstract:

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 [N8881][C6:0], methyltrioctylammonium octanoate [N8881][C8:0], methyltrioctylammonium laurate [N8881][C12:0], methyltrioctylammonium palmitate [N8881][C16:0], methyltrioctylammonium stearate [N8881][C18:0] and methyltrioctylammonium oleate [N8881][C18:1]. 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, [N8881][C6:0] and [N8881][C8:0] with both cast iron and bronze surfaces were the best surface-FAIL combinations regarding wettability.

Source: Scopus