title: Temperature sensitivity of nanochannel electrical conductance.
abstract: Electrical measurement is a widely used technique for the characterization of nanofluidic devices. The electrical conductivity of electrolytes is known to be dependent on temperature. However, the similarity of the temperature sensitivity of the electrical conductivity for bulk and nanochannels has not been validated. In this work, we present the results from experimental measurements as well as analytical modeling that show the significant difference between bulk and nanoscale. The temperature sensitivity of the electrical conductance of nanochannel is higher at low ionic concentration where the nanofluidic transport is governed by the electrostatic effects from the wall. Neglecting this effect can result in significant errors for high temperature measurements. Additionally, the temperature sensitivity of the nanochannel conductance allows to measure the enthalpy change of surface reactions at low ionic concentrations.
authors.affiliation: Microsystems Laboratory, Ecole Polytechnique Federale de Lausanne, EPFL STI-IMT-LMIS, Station 17, 1015 Lausanne, Switzerland.
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Taghipoor
authors.affiliation: Microsystems Laboratory, Ecole Polytechnique Federale de Lausanne, EPFL STI-IMT-LMIS, Station 17, 1015 Lausanne, Switzerland.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Bertsch
authors.affiliation: Microsystems Laboratory, Ecole Polytechnique Federale de Lausanne, EPFL STI-IMT-LMIS, Station 17, 1015 Lausanne, Switzerland.
authors.forename: Philippe
authors.initials: P
authors.lastname: Renaud
keywords: electrical conductance; enthalpy change; nanofluidics; surface charge density; temperature sensitivity