Effect of ambipolar fluxes on nanoparticle charging in low-pressure glow discharges
Ostrikov, K. (2005) Effect of ambipolar fluxes on nanoparticle charging in low-pressure glow discharges. Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), 71(2), 026405-1.
The effect of ambipolar fluxes on nanoparticle charging in a typical low-pressure parallel-plate glow discharge is considered. It is shown that the equilibrium values of the nanoparticle charge in the plasma bulk and near-electrode areas are strongly affected by the ratio S ath i of the ambipolar flux and the ion thermal velocities. Under typical experimental conditions the above ratio is neither S ath i≪ 1 nor S ath i≫1, which often renders the commonly used approximations of the purely thermal or "ion wind" ion charging currents inaccurate. By using the general approximation for the ambipolar drift-affected ion flux on the nanoparticle surface, it appears possible to obtain more accurate values of the nanoparticle charge that usually deviate within 10-25 % from the values obtained without a proper accounting for the ambipolar ion fluxes. The implications of the results obtained for glow discharge modeling and nanoparticle manipulation in low-pressure plasmas are discussed.
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|Item Type:||Journal Article|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Copyright Owner:||Copyright 2005 The American Physical Society|
|Deposited On:||16 Jul 2014 03:06|
|Last Modified:||17 Jul 2014 03:44|
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