Wetting Properties of Seven Phosphonium Cation-Based Ionic Liquids

Authors: Blanco, D., Bartolomé, M., Ramajo, B., Viesca, J.L., González, R., Hernández Battez, A.

Journal: Industrial and Engineering Chemistry Research

Publication Date: 14/09/2016

Volume: 55

Issue: 36

Pages: 9594-9602

eISSN: 1520-5045

ISSN: 0888-5885

DOI: 10.1021/acs.iecr.6b00821

Abstract:

This paper studies the wetting properties of seven phosphonium cation-based ionic liquids: trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl) phosphinate [P66614][(iC8)2PO2], trihexyltetradecylphosphonium bis(2-ethylhexyl)phosphate [P66614][BEHP], trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl) imide [P66614][NTf2], tributyltetradecylphosphonium dodecylbenzenesulfonate [P44414][DBS], tributylethylphosphonium diethylphosphate [P4442][DEP], trihexyltetradecylphosphonium dicyanamide [P66614][DCA], and trihexyltetradecylphosphonium chloride [P66614][Cl]. The surface tension was analyzed using the Gibbs free energy in a temperature range of 293-353 K, obtaining the expected linear decrease with temperature rise. The contact angle was measured on four different surfaces (AISI 52100 steel, CrN, TiN, and ZrN) and all liquids with high surface tensions interacting with hydrophobic systems displayed high contact angles as expected. The polarity fraction (PF) and the spreading parameter (SP) were estimated to complete and improve the wetting characterization of these ionic liquids, finding TiN-[P66614][BEHP] and TiN-[P66614][(iC8)2PO2] as the most favorable surface-ionic liquid combinations from a wetting point of view.

https://eprints.bournemouth.ac.uk/26189/

Source: Scopus