“…Furthermore, the contact angle between a liquid and a solid surface differs with the surface roughness as well as the surface energy or chemistry (Ding et al, 2006). Therefore, many studies and reviews have been reported on coating techniques to increase surface roughness such as sol-gel process, etching, electrospinning, chemical grafting, chemical vapour deposition and liquid flame spray (Berendjchi, Khajavi, & Yazdanshenas, 2011;Gurav et al, 2014;Hu, Zen, Gong, & Deng, 2009;Lee et al, 2013;Mahadik et al, 2013;Stepien et al, 2011Stepien et al, -2013Synytska, Khanum, Ionov, Cherif, & Bellmann, 2011; Teisala et al, 2010) Important progress achieved in this field has also been reported in several review papers (Genzer & Efimenko, 2006;Ma & Hill, 2006;Nakajima, Hashimoto, & Watanabe, 2001;Sanjay, Annaso, Chavan, & Rajiv, 2012;Song & Rojas, 2013).…”