Properties of superhydrophobic filter media prepared by TiO2–SiO2@PDMS coating

Study of nano-ZnO improvement of the mechanical properties and corrosion resistance of modified-SiO2/PTFE superhydrophobic nanocomposite coatings by one-step spraying

“…43 The method of evaluating the superhydrophobic coating to maintain superhydrophobic properties has been used in many previous articles, and more stringent conditions are set on this basis to test the wear resistance of the coating. 23,24,44 Fig. 7 shows the two wear tests of the superhydrophobic coating with the ratio of modified-SiO 2 : ZnO : PTFE equal to 0.4 : 0.6 : 1.…”

“…The water contact angle and sliding angle of the superhydrophobic coating after 50 cycles of wear tests are 157.2° ± 1° and 5 ± 1°. Compared with other superhydrophobic coatings, 23,24 the superhydrophobic coating is worn by long distance and cross-cycling at higher pressure, and the hydrophobicity of the coating is not reduced. This superhydrophobic coating has good anti-wear properties.…”

“…43 The method of evaluating the superhydrophobic coating to maintain superhydrophobic properties has been used in many previous articles, and more stringent conditions are set on this basis to test the wear resistance of the coating. 23,24,44 Compared with other superhydrophobic coatings, 23,24 the superhydrophobic coating is worn by long distance and cross-cycling at higher pressure, and the hydrophobicity of the coating is not reduced. This superhydrophobic coating has good anti-wear properties.…”

“…23 Li et al ingeniously combined TiO 2 and SiO 2 to obtain a rough surface with a multilayer structure and then used polydimethylsiloxane to reduce the surface energy of the superhydrophobic coating, but the water contact angle of the superhydrophobic coating decreased in the 50 cycles of the wear test. 24 The main reason for the low surface durability and fragility of superhydrophobic coatings is that the complex and rough micro–nano structures constructed on the surface are easily scratched and removed by external influences such as friction, impacts, and contact by a sharp material. 25 Another problem is that the superhydrophobic coating has poor corrosion resistance on the metal substrate.…”

SiO2-PDMS as Oil Removal System

“…Nowadays, water quality is a relevant issue of high environmental concern, since water is exposed to many pollutants, including oily substances that cause serious environmental damage [1]. To remove this type of substances, the use of hydrophobic surfaces has been proposed [2][3][4][5][6]. The modification of a silica using PDMS through the sol-gel method and the use of a polycondensation catalyst to obtain a sol solution containing the structure shown in Figure 2.…”