Abstract:
In this Letter we report a unique fractal aggregation behavior of NH4Cl
crystallites grown in agarose gel. The fractal branches consist of faceted
crystallites with remarkable correlations in their crystallographic orientations,
which are formed by successive heterogeneous nucleations. Unlike the conventional
fractal growth, this aggregation process occurs at a low growth driving
force with strong crystallographic anisotropy, which leads to the ordering
in the fractal branches.