Diffusion noise at the electrokinetic conversion
A. Y. Antohin, V. A. Kozlov · AIP conference proceedings · 1993
At the equilibrium state the noise of a capillary filled with low conductive liquid is determined by Johnson noise and by hydrodynamics fluctuations that are presented at any liquid. This noise has flatten form at low frequencies and presented in equilibrium ensemble where the average current is absent. In such state, current fluctuations do not contain a component due to fluctuations in concentration of charge carriers. Another situation arises in the presence of electrical current through a capillary. In that case the concentration fluctuations give contribution to the power spectrum density of noise and what’s more independently on Johnson noise. A new essentially arises at the hydrodynamics level of description. This is spatial dependence of elementary process.