Improved Methodology for Absorption Measurements in Ionic Liquids with a Quartz Crystal Microbalance. Issue 9 (20th June 2017)

• Record Type: Journal Article
• Authors: Schmidt, Clemens; Heym, Florian
• Other Names: Nirschl Hermann guestEditor.
• Is Part Of: Chemical engineering & technology. Volume 40:Issue 9(2017)
• Page Start: 1638
• Page End: 1643
• Publication Date: 2017-06-20
• Subjects: Absorption -- Gas purification -- Ionic liquids -- Phase equilibrium -- Quartz crystal microbalance; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201700046
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: The knowledge of vapor‐liquid equilibrium data of mixtures with performance chemicals, such as ionic liquids (ILs), is highly important for technical applications. New insights into the utilization of quartz crystal microbalances (QCMs) for reliable absorption measurements in ILs are provided. The validity of the Sauerbrey equation for rigid films and bulk liquids is widely discussed in literature. This work shows how to ensure the validity of the Sauerbrey equation during absorption measurements in thin liquid films. Furthermore, the advantages of the employment of rough electrodes for absorption measurements within thin liquid films in comparison to polished ones are described in detail. Important recommendations in application of the QCM systems regarding gravimetric measurements are presented. Abstract : The quartz crystal microbalance has gained increasing scientific interest, allowing precise detection of mass change per unit area in the range of a few nanograms per square centimeter. Reliable absorption measurements in ionic liquids were performed. Influencing factors and the resulting measures are discussed to ensure an accurate determination of the activity coefficient of gases.