Separation of oil/water mixtures has been turned into a very interesting topic due to the environmental concerns from industrial oily wastewater and polluted oceanic water as well as oil leakage accidents [1]. One of the most efficient methods to separate oily materials from water is to induce superhydrophobic and superoleophilic properties to a certain substrate like sponges, meshes, fabrics, and etc. [2]. To achieve the superhydrophobicity (water contact angle > 150o), one should provide two conditions including proper level of roughness and low surface energy on the desired material. If the surface energy of the material is tuned in a way that is lower than that of water but higher than those of oil, the modified material repels water and absorbs oil. The main aim of this study is to impart superhydrophobicity and superoleophilicity onto the metal-based meshes with different pore sizes via coating the meshes by a polymer-based nanocomposite. To this end, polydimethylsiloxane (PDMS) is used as the matrix for the nanocomposite causing the surface energy of the meshes to be highly lowered. To increase the roughness, zinc oxide (ZnO) nanoparticles are utilized. Firstly, the wettability o the coated meshes is investigated by the water contact angle measurement. The surface morphology of the coated nanocomposite on the meshes’ surface is characterized via scanning electron microscopy. References: [1] Feng L, Zhang Z, Mai Z, et al. (2004) Angew Chem Int Ed 43:2012-2014 [2] Piltan S, Seyfi J, Hejazi I, Khonakdar HA (2016) Cellulose 23:3913-3924