A study on aggregates cluster structure of polymeric microglobules on the cutting surface of monolithic fused-silica columns for capillary electrochromatography

On the basis of a cluster lattice model, the cross-sections of monolithic sorbents in fused-silica microcolumns for capillary electrochromatography were studied. The columns were obtained by polymerization of methacrylate monomers in solution under the influence of accelerated electrons. It was shown that the size distribution and packing density of microglobules on the surface cross-sections depend on the composition of a mixture of monomers and the content of porogenic solvents. At the threshold degree of surface coverage by globules, there is a fractal cluster function, for which the radial density distribution g ( R ) decreases with increasing radius R as a power law. An infinite cluster of pores, with a finite probability of the injected fluid flowing through the interconnected free knots or percolated pores of the monolithic sorbent, is formed near the threshing surface coverage of a cross-section by microglobules.