Separate density and viscosity determination of room temperature ionic liquids using dual Quartz Crystal Microbalances

Nicola Doy, Glen McHale, Michael Newton, Christopher Hardacre, Rile Ge, R. W. Allen, J. M. MacInnes

Research output: Chapter in Book/Report/Conference proceedingChapter

9 Citations (Scopus)

Abstract

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 240µL. 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 µm thus opening up the possibility of integration into lab-on-a-chip systems.
Original languageEnglish
Title of host publication2009 IEEE Sensors
Place of PublicationPiscataway
PublisherIEEE
Pages287-290
Number of pages4
ISBN (Print)978-1-4244-4548-6
DOIs
Publication statusPublished - 2009
EventIEEE Sensors 2009 Conference - SENSORS 2009 - Christchurch, New Zealand
Duration: 25 Oct 200928 Oct 2009

Conference

ConferenceIEEE Sensors 2009 Conference - SENSORS 2009
CountryNew Zealand
CityChristchurch
Period25/10/0928/10/09

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