Abstract
A novel and facile approach was proposed to fabricate superhydrophobic surface with similar micro- and nanostructures of lotus leaf on the steel foil. The acidic solution was used to grow Fe3O4 nanosheet films consisted of hydrochloric acid and potassium chloride under an O2 rich environment. The as-prepared superhydrophobic steel surfaces had water CA (contact angle) of 166±2°. The water SA (sliding angle) was less than 2°. In order to estimate the drag reduction property of the as-prepared surface, the experimental setup of the liquid-solid friction drag was proposed. The drag reduction ratio for superhydrophobic surface was 61.3% compare with untreated surface at a flow velocity of 1.66ms−1.
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