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Non-Faradaic electric currents in the Nernst-Planck equations and nonlocal diffusiophoresis of suspended colloids in crossed salt gradients
Physical Review Letters ( IF 9.227 ) Pub Date : 
Patrick B. Warren

In the Nernst-Planck equations in two or more dimensions, a non-solenoidal current can arise as a consequence of connecting patches with different liquid junction potentials. Whereas this current vanishes for binary electrolytes or in one-dimensional problems, it is in general non-vanishing for example in crossed salt gradients. For a suspended colloidal particle, chemiphoresis in the concentration gradients is generally vectorially misaligned with electrophoresis in the electrostatic potential gradient, and there is a non-local contribution to the latter deriving from the ohmic electric field associated with the current; in a case study this contributes up to 20–30% of the total effect.
更新日期:2020-05-22

 

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