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Percolation of carbon nanotubes (CNTs) in liquid crystals (LCs) opens way fora unique class of anisotropic hybrid materials with a complex dielectricconstant widely controlled by CNT concentration. Percolation in such systems iscommonly described as a one-step process starting at a very low loading ofCNTs. In the present study the two-step percolation was observed in the samplesof thickness 250 $\mu$m obtained by pressing the suspension between twosubstrates. The percolation concentrations for the first and second percolationprocesses were $C_n^{p_1}\approx 0.0002$ wt. \% and $C_n^{p_2}\approx 0.5$ wt.\%, respectively. The two-stage nature of percolation was explained on a baseof mean field theory assuming core-shell structure of CNTs.

Two-step electrical percolation in nematic liquid crystal filled by multiwalled carbon nanotubes