Abstract
The surface tension of ionic liquids with the tris(pentafluoroethyl)trifluorophosphate (FAP) anion were measured using a home-built surface tensiometer. A high-vacuum line was used to pre-evacuate the ionic liquids prior to analyses, ensuring that the samples were free of dissolved gases, water, and volatile impurities. Using the pendant drop method, measurements were performed in a custom-built surface tension vacuum or gas cell, in the presence of nitrogen and carbon dioxide gas. To calibrate the instrument, surface tension measurement of known liquids was also performed. Results show that the presence of saturated carbon dioxide led to the lowering of measured surface tension values, indicating the adsorption of CO2 on the ionic liquid surface.
Award Identifier / Grant number: CHE-20-1-04
Funding source: Philippine Council for Industry, Energy, and Emerging Technology Research and Development
Funding source: National Research Council of the Philippines
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Research funding: Acknowledging funding support provided by the DOST-PCIEERD, DOST-NRCP, and the NSRI (CHE-20-1-04). The group is grateful to the contribution of Mr. Joshua Ambong for fitting the BMIMBF4 drops.
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Supplementary Material
This article contains supplementary material (https://doi.org/10.1515/pac-2023-1113).
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