The dynamics of spreading of a water drop on a vertically aligned Si nanorod array surface is studied with a fast charge coupled device camera. Four dynamic spreading regimes are identified, with a precursor rim advancing ahead of the contact line. The diameters of the precursor rim Dp, the precursor length δ, and the contact line Dc obey dynamic scaling laws, Dc,ptnc,p2, with nc0.216 and np0.272, and δt12. The exponents do not vary significantly with the nanorod height and are consistent with the dynamic spreading behavior on a rough or porous surface.

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