We studied self-assembling pattern formation during the evaporating alkane suspension of nano particles. We found that these patterns show self-similarity and their fractal dimension increases as the particle concentration of suspension increases or as the molecular weight of the solvent alkane decreases. We discussed the mechanism of the pattern formation regarding the inhomogeneous convective motion of particles, which is likely resulted from the fact that the contact angle varied with the particle concentration. The simulation results of particle accumulation by two-dimensional capillary force were compared with the experiments.
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