Interfacial Tension of <i>n</i>-Alkane and Ionic Liquid Systems

Zhang, Xiangjing; Hu, Yongqi

doi:10.1021/je100407f

Cited by 21 publications

(19 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar agreement has been achieved for other C n /C m TAB systems, including C 16 /C 18 TAB, where our WP results agree well with both our and Denkov et al’s PD measurements. Indeed, the WP (and even ring) method is widely used for γ( T ) measurements at liquid/liquid interfaces similar to ours, − including liquid/liquid and liquid/air systems comprising cationic surfactants. ,− We emphasize that while drop detachment prevents PD measurements below 1 to 2 mN/m, the WP method clearly shows that γ( T ) decreases continuously, with the same slope, down to zero. As shown in Figure a,b, the WP’s agreement with PD over the PD’s limited γ range is excellent, and no jumps, breaks, or slope changes that may be indicative of plate dewetting are observed in the WP data, thus validating the linear extrapolation of the PD data and demonstrating the ability of the WP method to measure low γ values, when properly applied (Supporting Information).…”

Section: Resultssupporting

confidence: 65%

Temperature-Tuned Faceting and Shape Changes in Liquid Alkane Droplets

et al. 2017

View full text Add to dashboard Cite

Recent extensive studies reveal that surfactant-stabilized spherical alkane emulsion droplets spontaneously adopt polyhedral shapes upon cooling below a temperature T while remaining liquid. Further cooling induces the growth of tails and spontaneous droplet splitting. Two mechanisms were offered to account for these intriguing effects. One assigns the effects to the formation of an intradroplet frame of tubules consisting of crystalline rotator phases with cylindrically curved lattice planes. The second assigns the sphere-to-polyhedron transition to the buckling of defects in a crystalline interfacial monolayer, known to form in these systems at some T > T. The buckling reduces the extensional energy of the crystalline monolayer's defects, unavoidably formed when wrapping a spherical droplet by a hexagonally packed interfacial monolayer. The tail growth, shape changes, and droplet splitting were assigned to the decrease and vanishing of surface tension, γ. Here we present temperature-dependent γ(T), optical microscopy measurements, and interfacial entropy determinations for several alkane/surfactant combinations. We demonstrate the advantages and accuracy of the in situ γ(T) measurements made simultaneously with the microscopy measurements on the same droplet. The in situ and coinciding ex situ Wilhelmy plate γ(T) measurements confirm the low interfacial tension, ≲0.1 mN/m, observed at T. Our results provide strong quantitative support validating the crystalline monolayer buckling mechanism.

show abstract

Section: Resultssupporting

confidence: 65%

Temperature-Tuned Faceting and Shape Changes in Liquid Alkane Droplets

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Similar results were observed for the interfacial tensions of four other imidazolium-based ILs ([C n -mim][PF 6 ]; where n = 5−8) with hexane and heptane. 5,22 The IFT measurements of several 1,3-dialkyl imidazoliumbased ionic liquids in water and n-hexane/n-octane/n-decane was performed as a function of temperature from 293 to 323 K. An increase in temperature slightly decreased the interfacial tension of water−alkane system. The anion and alkyl chain length of ILs were found to have a substantial impact on the IFT of aqueous solutions of IL−n-alkane systems.…”

Section: Introductionmentioning

confidence: 99%

Use of Aromatic Ionic Liquids in the Reduction of Surface Phenomena of Crude Oil–Water System and their Synergism with Brine

Sakthivel

Velusamy

Gardas

et al. 2015

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Enhanced oil recovery is governed primarily by the role of interfacial tension between crude oil and water. Interfacial tension (IFT) of the crude oil−water system is one of the vital factors in the analysis of the capillary forces affecting trapped oil within the reservoir rocks. High salinity and temperature of the reservoirs tend to make researchers search for new surfactants to lower the interfacial tension in crude oil−water systems. The current study hopes to create a move toward solving the above problem through the use of aromatic ionic liquids (ILs) based on imidazolium as the cation and various anions such as [HSO 4 ] − , and [PF 6 ] − in different concentrations. This work involves the study of the effect of concentration, temperature, time, and brine on the fate of surface tension (SFT) of water and interfacial tension of crude oil− water systems. The present study also addresses the trend in the electrical conductivity of ILs in water along with the effect of temperature and concentration of ILs. The study reveals that these ILs are effective in reducing the SFT and IFT of water and crude oil−water systems at high salinity and temperature conditions. In the IFT measurements, a linear decrement with increase in temperature is observed for crude oil−water in the presence of ILs. The interfacial tension of the various imidazolium-based ionic liquids with the crude oil−water system has been measured as a function of temperature by means of the Wilhelmy plate method. The influence of the nature of cation and anion of ionic liquids and of the chain length on the cationic head of the ILs on interfacial tension is also discussed in detail. At increased salinity conditions, unlike classical surfactants, these ILs are found to be more successful. Enhanced efficiency of the drop in IFT using NaCl and IL mixture has been confirmed by measuring the IFT between crude oil and the aqueous solution of IL. The synergism of salt and IL mixture on the reduction of IFT has been observed.

show abstract

“…[15] Their fascinating nature makes it possible to dissolve various aromatic amines while forming stable interfaces with alkanes. [16,17] Such anhydrous interfaces can thoroughly avoid the hydrolysis of acyl chloride during interfacial polymerization. Herein, we report as eries of alkane-IL interfaces,i n which ILs act as universal solvents for diversified amine monomers,t os ynthesize polyamide nanofilms by the interfacial polymerization between the amine and trimesoyl chloride (TMC) (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Interfacial Polymerization at the Alkane/Ionic Liquid Interface

et al. 2021

View full text Add to dashboard Cite

Polymerization at the liquid–liquid interface has attracted much attention for synthesizing ultrathin polymer films for molecular sieving. However, it remains a major challenge to conduct this process outside the alkane–water interface since it not only suffers water‐caused side reactions but also is limited to water‐soluble monomers. Here, we report the interfacial polymerization at the alkane/ionic liquid interface (IP@AILI) where the ionic liquid acts as the universal solvent for diversified amines to synthesize task‐specific polyamide nanofilms. We propose that IP@AILI occurs when acyl chloride diffuses from the alkane into the ionic liquid instead of being triggered by the diffusion of amines as in the conventional alkane–water system, which is demonstrated by thermodynamic partitioning and kinetic monitoring. The prepared polyamide nanofilms with precisely adjustable pore sizes display unprecedented permeability and selectivity in various separation processes.

show abstract

Interfacial Tension of n-Alkane and Ionic Liquid Systems

Cited by 21 publications

References 22 publications

Temperature-Tuned Faceting and Shape Changes in Liquid Alkane Droplets

Temperature-Tuned Faceting and Shape Changes in Liquid Alkane Droplets

Use of Aromatic Ionic Liquids in the Reduction of Surface Phenomena of Crude Oil–Water System and their Synergism with Brine

Interfacial Polymerization at the Alkane/Ionic Liquid Interface

Contact Info

Product

Resources

About