3-16. Floating Potential. Micro-particles or aerosols (110m) are usually negatively charged in a steady-state non-thermal plasma and have floating potential (3-237) with respect to the plasma. Estimate the typical negative charge of such particles as a function of their radius. Assume that micro-particles are spherical and located in non-thermal plasma with electron temperature about 1eV. Balancing the ion and electron fluxes to the floating wall leads to the expression for the change of potential across the sheath in this case: =e1TelnM/2m