Formation and dynamics of nano-particles in a stratified spherical glow discharge S. Z. Sakhapov, A. V. Fedoseev, G. I. Sukhinin and S. A. Novopashin EPL, 110 1 (2015) 15003 Published online: 17 April 2015 DOI: 10.1209/0295-5075/110/15003