Mobility and density of ions in chitosan-orthophosphoric acid-ammonium nitrate electrolytes

• Main Authors: Majid, Siti Rohana, Arof, Abdul Kariem
• Format: Article
• Published: John Wiley & Sons 2007
• Subjects: QC Physics
• Online Access: http://eprints.um.edu.my/7590/; https://doi.org/10.1002/pssa.200622531

An important factor that contributes significantly to the conductivity of a material is the number density and mobility of the mobile species. In this work the number density of mobile ions, n, was calculated using the Rice and Roth model and the random walk formulation. The value of n as calculated using the Rice and Roth model depends on the activation energy and mean free path of the ions whereas calculation using the random walk formulation depends on the hopping rates of the ions. Our results show that the values of n calculated using the random walk formulation is more than one order of magnitude larger than that calculated using the Rice and Roth model. Unlike mobility, the values of n do not show significant changes with temperature. This suggests that mobility influences the conductivity of the polymer at elevated temperatures. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinbeim.