Correlation of Macroscopic Surface Tension and Microscopic Surface Composition of Binary Ionic Liquid Mixtures with Common Cations and Anions of Different Size

被引:0
|
作者
Zhai, Ziwen [1 ,2 ]
Barreto, Jade [3 ]
Hemmeter, Daniel [3 ]
Maier, Florian [3 ]
Steinrueck, Hans-Peter [3 ]
Koller, Thomas M. [1 ,2 ]
机构
[1] Friedrich Alexander Univ Erlangen Nurnberg FAU, Inst Adv Opt Technol Thermophys Properties AOT TP, Dept Chem & Biol Engn CBI, D-91052 Erlangen, Germany
[2] Friedrich Alexander Univ Erlangen Nurnberg FAU, Erlangen Grad Sch Adv Opt Technol SAOT, D-91052 Erlangen, Germany
[3] Friedrich Alexander Univ Erlangen Nurnberg FAU, Dept Chem & Pharm Phys Chem 2, D-91058 Erlangen, Germany
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 2025年 / 129卷 / 10期
关键词
PHASE-CATALYZED HYDROFORMYLATION; 1-ETHYL-3-METHYLIMIDAZOLIUM ACETATE; PHYSICAL-PROPERTIES; TEMPERATURE; DENSITY; SUBSTITUENTS; DICYANAMIDE; SOLUBILITY; TRANSITION; COSOLVENT;
D O I
10.1021/acs.jpcb.4c08785
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We investigated the surface tension and surface composition of binary ionic liquid (IL) mixtures of ILs sharing the same cation. As model system, binary mixtures of 1-ethyl-3-methylimidazolium acetate ([C2C1Im][OAc], molar volume: 256.2 cm3<middle dot>mol-1 at 293 K) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2C1Im][Tf2N], molar volume: 154.4 cm3<middle dot>mol-1 at 293 K), with very different surface tensions, and with anions of very different chemical structure and size were studied over the whole composition range. The surface tension was obtained by pendant-drop (PD) measurements in the presence of 0.1 MPa argon between 294 and 323 K, and the surface composition was determined by angle-resolved photoelectron spectroscopy (ARXPS) in ultrahigh vacuum at 293 K. The ARXPS results reveal a strong preferential enrichment of [C2C1Im][Tf2N] at the vacuum-liquid interface of the binary mixtures, which is more pronounced at lower [C2C1Im][Tf2N] bulk contents. This microscopic behavior is reflected in the macroscopic surface tensions, which are significantly lower than calculated assuming a linear mixing behavior based on the bulk composition. A previously developed prediction model to correlate the surface tension with the molar surface composition yields deviations of more than 5% from the measured values, which we attribute to the strongly different sizes of the anions. By accounting for the surface areas occupied by the ILs, we present an improved new model which describes the experimental data very well within 1.4%.
引用
收藏
页码:2789 / 2800
页数:12
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