Nonlinear screening

It should be pointed out that the above questions have been the subject of large number of studies, where a number of important results has been obtained. The effects of nonlinear screening in the thermodynamically equilibrium case of charged colloidal suspension were studied in [11-13], It was found that in the presence of the nonlinear effects the effective potential at distances can be described by the linear Debye-Hiickel theory, however, with some effective charge being less than the bare grain charge. 

It is clear that the above phenomenon of nonlinear screening is of importance for structural properties of colloidal plasmas. Its effect on the phase diagram for charged colloidal suspension can be illustrated on the basis of the model of effective intergrain forces in the following way. 

Figure 3. Melting curves for colloidal plasmas in Z — A plane. Solid line v 5 10-2 long dashes v = 5 10 3 short dashes v 5 10 4. Nonlinear screening effects in shifting the melting curves to higher values of asymmetry Z at small packing fractions.

Thus, we see that the qualitative change in the structural properties near the point x = 4 is rather general feature of asymmetric two-component plasma and the threshold value obtained in MC simulations of this system is in a good agreement with the studies of nonlinear screening of a single grain based on the continuous PB theory. 

Nonlinear Screening and Electron Capture Processes of Ions in Metals... 

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