Non-faradaic impedance characterization of an evaporating droplet for microfluidic and biosensing applications.

@article{Dak2014NonfaradaicIC,
  title={Non-faradaic impedance characterization of an evaporating droplet for microfluidic and biosensing applications.},
  author={Piyush Dak and Aida Ebrahimi and Muhammad Ashraf Alam},
  journal={Lab on a chip},
  year={2014},
  volume={14 14},
  pages={2469-79}
}
We have developed a general numerical/analytical theory of non-faradaic impedance of an evaporating droplet, and validated the model by experiments involving droplets of various analyte concentrations deposited on a surface defined by coplanar electrodes. The impedance of the droplet Z(n0,t,f) is analyzed as a function of the concentration (n0) of the ions in the solution, the measurement frequency (f) and the evaporation time (t). We illustrate the versatility of the model by determining the… CONTINUE READING
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