The particle size will vary from 20nm to 150 nm (so no first principle based) with different shapes like circular to more complex 2D/3D shapes. plasma conditions are lower than 500eV.. typically from 1 eV to 100eV range.
If you still have no answer to your question; I suggest you to contact an expert of "Dusty plasmas": Professor L.BOUFENDI from universite of Orleans in France/ GREMI laboratory