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

Doy, Nicola, McHale, Glen, Newton, Michael, Hardacre, Christopher, Ge, Rile, Allen, R. W. and MacInnes, J. M. (2009) Separate density and viscosity determination of room temperature ionic liquids using dual Quartz Crystal Microbalances. In: 2009 IEEE Sensors. IEEE, Piscataway, pp. 287-290. ISBN 978-1-4244-4548-6

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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.

Item Type:	Book Section
Subjects:	F100 Chemistry
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Becky Skoyles
Date Deposited:	08 Jun 2017 10:29
Last Modified:	12 Oct 2019 19:06
URI:	http://nrl.northumbria.ac.uk/id/eprint/30987

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