Title: SCREENING OF HIGH-Z GRAINS AND RELATED PHENOMENA IN COLLOIDAL PLASMAS
Author(s): O.Bystrenko, T.Bystrenko, A.Zagorodny (Bogolyubov Institute for Theoretical Physics, 03143 Kiev, Ukraine)

Recent important results are briefly presented concerning the screening of high-$Z$ impurities in colloidal plasmas. The review focuses on the phenomenon of nonlinear screening and its effects on the structure of colloidal plasmas, the role of trapped ions in grain screening, and the effects of strong collisions in the plasma background. It is shown that the above effects may strongly modify the properties of the grain screening giving rise to considerable deviations from the conventional Debye-H\"uckel theory as dependent on the physical processes in the plasma background.

Key words: high-$Z$ impurity, charged colloidal suspension, dusty plasma, nonlinear screening, bound ionic states, strong collisions
PACS: 52.25.Vy, 52.27.Lw, 52.65.-y