Fabrication Of Superhydrophobic/Superoleophobic Structure On Cu Surfaces And Its Property

Superantiwetting materials with liquid contact angle>150° have excellent properties on self-cleaning,anti-fogging,anti-corrosion,etc.They can be widely applied to the fields of materials science and surface chemistry Modifying the metal substrates(i.e.,metal parts in electronic devices,Cu pipes in air conditioning condensers,and floating pipe lines,etc.)with superantiwetting surfaces can improve their anti-corrosion property,protect the parts and prolong the service life of the equipment.This is because the water or oil droplets can hardly form a stable thin film on the treated superantiwetting surfaces.Thus the corrosion of internal metals can be delayed or avoided.To construct a superantiwetting surface,there are two requirements:physical roughness and the modification of low surface free energy chemicals.The Cu micro-cones array fabricated by the template-free chemical deposition method owns rather high roughness,which can be utilized as the basic structure for a superantiwetting surface.Therefore,this paper explored the feasibility of constructing superhydrophobic/superamphiphobic surfaces based on the Cu micro-cones array through several methods,i.e.,electrografting method,chemical grafting method,and plasma enhanced dip-coating method.In this paper,we observed the morphology of the obtained surface,analyzed its chemical composition,explored its mechanism,and characterized its wetting and anti-corrosion properties.And the main research contents and results are shown as follows:1.Polymethyl methacrylate(PMMA)thin film was modified onto the Cu micro-cones array substrate by electrografting method.Surfaces with various wetting property were obtained by adjusting different electro grafting time.Compared by the wetting property of Cu plate,the water contact angles(WCA)and anti-corrosion property of the PMMA modified Cu micro-cones array improved significantly.In addition,the treated surfaces own good acid resistance,frost resistance,however,a poor alkali resistance.2.PMMA thin film was modified onto the Cu micro-cones array substrate through chemical grafting method.Surfaces with various wetting property were obtained by applying different chemical grafting time.In this process,we found the Cu micro-cones were corroded due to intergranular corrosion of the secondary crystals which further increased the roughness of the original Cu micro-cones.In this case,the surfaces gained superhydrophobicity in a shorter time than the surfaces fabricated by electrografting method.3.The Cu micro-cones array substrate was first activated by air plasma and then dipped into tridecafluoro-1,1,2,2-tetrahydrooctyl trichlorosilane(FTS)solution for different reaction time and superamphiphobic surfaces were achieved.In this process,FTS reacted with the Cu micro-cones array substrate and the substrate was corroded due to intergranular corrosion of secondary crystals.Second level roughness showed which enhanced the original roughness.The Cu surfaces treated by this method achieved superamphiphobicity and the anti-corrosion of the surfaces was enhanced as well.