Fractal aggregates evolution of methyl red in liquid crystal |
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Authors: | F Ciuchi L Sorriso-Valvo A Mazzulla J M Redondo |
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Institution: | (1) Regional Laboratory LICRYL - INFM/CNR, Ponte Pietro Bucci, Cubo 33B, I-87036 Rende (CS), Italy;(2) Center of Excellence CEMIF.CAL, 87036 Rende (CS), Italy;(3) Departamento de Física Aplicada, Universitat Politécnica de Catalunya, Campus Nord UPC, Modul B5, E-08034 Barcelona, Spain |
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Abstract: | The spontaneous formation of dendritic aggregates is observed in a two-dimensional confined layered system consisting of a
film composed of liquid crystal, dye and solvent cast above a polymer substrate. The observed aggregates are promoted by phase
separation processes induced by dye diffusion and solvent evaporation. The growth properties of the aggregates are studied
through the temporal evolution of their topological properties (surface, perimeter, fractal dimension). The fractal dimension
of the completely formed structures, when they are coexistent with different types of structures, is consistent with theoretical
and experimental values obtained for Diffusion-Limited Aggregates. Under different experimental conditions (temperature and
local dye concentration) the structure forms without interactions with other kinds of structures, and its equilibrium fractal
dimension is smaller. The fractal dimension is thus not a universal property of the observed structures, but rather depends
on the experimental conditions. |
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Keywords: | PACS" target="_blank">PACS 61 43 Hv Fractals macroscopic aggregates (including diffusion-limited aggregates) 61 30 -v Liquid crystals 68 70 +w Whiskers and dendrites (growth structure and nonelectronic properties) |
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