Effect of the size of silica nanoparticles on wettability and surface chemistry of sol–gel superhydrophobic and oleophobic nanocomposite coatings

The durability of superhydrophobic films

“…Figure 3(b), (c), and (d) illustrate the high-resolution spectra for C1s, O1s, and Si2p, respectively. C1s peak is decomposed into three components at 283.98 eV, 284.6 eV, and 285.8 eV assigned to -Si-C*H 3 [29,30], -CH 2 -C*H 3 [31,32], and -O-C*H 2 -CH 3 [29], respectively. The first component represents the hydrophobic functional groups, whereas the latter two are derived from the incomplete hydrolysis of TEOS.…”

Fabrication of low adhesive superhydrophobic surfaces using nano Cu/Al 2 O 3 Ni–Cr composited electro-brush plating

“…3,8,9,10,11) are used to investigate the relationship between Cu nanoparticles concentrations and hydrophobic properties; samples (No. 3,11,12) are used to investigate the relationship between electroplating times and hydrophobic properties.…”

“…Hence with the help of micro/nano hierarchical structures and low surface energy materials, superhydrophobic surface can be easily fabricated. Many previous researches have proposed many methods to fabricate superhydrophobic surface, including laser processing [8], plasma etching [9], chemical vapor deposition [10], chemical etching [11], sol-gel technique [12] and electrodeposition [13]. However, all these methods are flawed in cost, hydrophobic durability and complex process, which limit their practical applications.…”

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

“…The resultant surface of the sol-gel coatings exhibited a highly porous structure with nanosize voids and randomly distributed micro size bumps, showing a water contact angle as high as 162.5 • with an excellent adhesion and pencil hardness. In a later work, Lakshmi et al [54] reported the effect of size of silica nanoparticles on wettability and surface chemistry for the design of sol-gel superhydrophobic and oleophobic coatings with good self-cleaning properties, a thermal treatment being necessary to expel the trapped solvents. Another approach for the preparation of scratch-resistant superhydrophobic coatings by applying a multilayer approach including multiple sol-gel processes is presented by Taurino et al [55].…”