Separate Density and Viscosity Determination of Room Temperature Ionic Liquids using Dual Quartz Crystal Microbalances

N. Doy*, G. McHale, M. I. Newton, C. Hardacre, R. Ge, R. W. Allen, J. M. MacInnes

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)


The drive towards cleaner industrial processes has led to the development of room temperature ionic liquids (RTIL) as environmentally friendly solvents. They comprise solely of ions which are liquid at room temperature and with over one million simple RTIL alone it is important to characterize their physical properties using minimal sample volumes. Here we present a dual Quartz Crystal Microbalance (QCM) which allows separate determination of viscosity and density using a total sample volume of only 240 mu L. Liquid traps were fabricated on the sensing area of one QCM using SU-8 10 polymer with a second QCM having a flat surface. Changes in the resonant frequencies were used to extract separate values for viscosity and density. Measurements of a range of pure RTIL with minimal water content have been made on five different trap designs. The best agreement with measurements from the larger volume techniques was obtained for trap widths of around 50 pm thus opening up the possibility of integration into lab-on-a-chip systems.

Original languageEnglish
Title of host publication2009 IEEE SENSORS, VOLS 1-3
Place of PublicationNEW YORK
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Print)978-1-4244-4548-6
Publication statusPublished - 2009
Event8th IEEE Conference on Sensors - Christchurch, New Zealand
Duration: 25 Oct 200928 Oct 2009


Conference8th IEEE Conference on Sensors
Country/TerritoryNew Zealand




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