Wetting Properties of Seven Phosphonium Cation-Based Ionic Liquids

Abstract

This paper studies the wetting properties of seven phosphonium cation-based ionic liquids: trihexyltetradecylphosphonium bis (2,4,4-trimethylpentyl)

Meta-Analysis Comparing Wettability Parameters and the Effect of Wettability on Friction Coefficient in Lubrication

“…Since (4) describes the competition between full and partial wetting, it can also be interpreted as the difference between the adhesion work between the fluid and the surface (W A ) and the cohesion work between liquid molecules (W C ) [12,14]. As shown in [12,14,34,35] adhesion and cohesion work can be estimated as…”

“…The evaluation of SP (9) requires knowledge of the total, disperse, and polar components of surface tension between the liquid and the surrounding medium (γ LM ) and the diffuse and polar components of the surface energy of the solid (γ S ). The diffuse and polar components of the surface energy can be determined through a series of experiments measuring the contact angles of model liquids on a surface of interest [6,[9][10][11][12]14]. The diffuse component of the liquid surface tension is determined by measuring the contact angle of the liquid on a polytetrafluorethylene (PTFE) surface.…”

“…These parameters scale the difference between the work of adhesion and cohesion by the surface tension of the lubricant (Equations (10) and (11)) or the energy of surface (Equations (12) and (13)). Like the dimensional spreading parameters, formulations that depend on the contact angle require fewer empirical inputs at the cost of losing information on the relative importance of polar and disperse components of surface tension and surface energy.…”

“…While the role of lubricant viscosity is fairly well established [3,8], the effects of wettability across multiple wetting regimes is less well understood [6][7][8][9][10][11][12][13][14][15][16][17]. To improve the understanding of wettability in tribological systems, recent investigations have worked to characterize the wettability of a variety of novel lubricants [6,[12][13][14][15] and to understand the role of wettability in tribological performance [6][7][8]10,11,[16][17][18]. In HL, high wettability (and low contact angles) are often desirable.…”

Desarrollo de columnas capilares con líquidos iónicos como fases estacionarias para cromatografía de gases

“…Por otro lado, se ha determinado que un aumento del tamaño del anión genera un efecto de dispersión de la carga que conlleva a una disminución de la tensión superficial. Esto explica los valores altos de THTDP-DCA y THTDP-Cl, y los valores más bajos reportados en la referencia [12] para THTDP-[(iC8)2PO2] (bis(2,4,4-trimetilpentil)fosfato) y THTDP- [BEHP] (bis(2-etilhexil)fosfato). Esto también se observó para los LIs de imidazolio.…”