Electrostatic enhancement factor for the coagulation of silicon nanoparticles in low-temperature plasmas
| Autor: | Claude Boucher, Benjamin Santos, François Vidal, Laura Cacot |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Physics Condensed Matter - Mesoscale and Nanoscale Physics Nanoparticle FOS: Physical sciences Plasma Dielectric Condensed Matter Physics 01 natural sciences Induced polarization 010305 fluids & plasmas Orders of magnitude (time) Chemical physics 0103 physical sciences Moment (physics) Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Coagulation (water treatment) Multipole expansion |
| DOI: | 10.48550/arxiv.1808.07547 |
| Popis: | The coagulation enhancement factor due to electrostatic (Coulomb and polarization-induced) interaction between silicon nanoparticles was numerically computed for different nanoparticle sizes and charges in typical low-emperature argon-silane plasma conditions. We used a rigorous formulation, based on a multipole moment coefficients, to describe the complete electrostatic interaction between dielectric particles. The resulting interaction potential is non-singular at the contact point, which allows to adapt the orbital-motion limited theory to calculate the enhancement factor. It is shown that, due to induced polarization, coagulation is enhanced in neutral-charged particles encounters up to several orders of magnitude. Moreover, the short-range force between like-charged nanoparticles can become attractive as a direct consequence of the dielectric nature of the nanoparticles. The multipolar coefficient potential is compared to an approximate analytic form which can be readily used to simplify the calculations. The results presented here provide a better understanding of the electrostatic interaction in coagulation and can be used in dust growth simulations in low-temperature plasmas where coagulation is a significant process. Comment: submitted to PSST |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|