Super-hydrophobic and super-oleophobic membrane and preparation method thereof
A super-hydrophobic, super-oleophobic and super-hydrophobic technology is applied in the field of hydrophobic and super-oleophobic films and their preparation, which can solve the problems of fouling, membrane wetting and membrane fouling, and achieve simple equipment, easy process control, and good anti-wetting performance. Effect
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Embodiment 1
[0044] Example 1 This example provides a method for preparing a superhydrophobic superoleophobic film
[0045] Specific steps are as follows:
[0046] (1) Construction of superhydrophobic membrane surface structure: Al2O3 nanoparticles (NPs) are used to construct groove structures on PVDF commercial membranes to obtain superhydrophobic surfaces. The superhydrophobicity depends on the size (R) and particle distance (D) of nanoparticles. ), D* (defined as the feature spacing ratio) to determine the relationship between D and R, the calculation method is as follows:
[0047]
[0048] The robustness factor A* can be used to represent superhydrophobicity. A larger A* indicates that the composite interface is stable, and there is a high-energy barrier between the metastable composite interface and the fully wetted interface. A*>1 can achieve superhydrophobicity. Its expression is as follows:
[0049]
[0050] where gamma lv , ρ, g are surface tension, liquid density and gra...
Embodiment 2
[0061] This embodiment provides a method for preparing a superhydrophobic superoleophobic film
[0062] Specific steps are as follows:
[0063] (1) Construction of superhydrophobic membrane surface structure: using SiO 2 Nanoparticles (NPs) build a groove structure on the PES commercial film to obtain a superhydrophobic surface. The superhydrophobicity depends on the size (R) and particle distance (D) of the nanoparticles. D* (defined as the characteristic distance ratio) is determined The relationship between D and R is calculated as follows:
[0064]
[0065] The robustness factor A* can be used to represent superhydrophobicity, and a larger A* indicates that the composite interface is stable, and there is a high-energy barrier between the metastable composite interface and the fully wetted interface. A*>1, superhydrophobicity can be achieved, and its expression is as follows:
[0066]
[0067] where gamma lv , ρ, g are surface tension, liquid density and gravitati...
Embodiment 3
[0078] This embodiment provides a method for preparing a superhydrophobic superoleophobic film
[0079] Specific steps are as follows:
[0080] (1) Construction of superhydrophobic membrane surface structure: using Fe 3 o 4 Nanoparticles (NPs) construct a groove structure on a commercial polyethersulfone (PES) membrane to obtain a superhydrophobic surface. The superhydrophobicity depends on the size (R) and interparticle distance (D) of the nanoparticles. D* (defined as the characteristic Spacing ratio) to determine the relationship between D and R, the calculation method is as follows:
[0081]
[0082] The robustness factor A* can be used to represent superhydrophobicity, and a larger A* indicates that the composite interface is stable, and there is a high-energy barrier between the metastable composite interface and the fully wetted interface. A*>1, superhydrophobicity can be achieved, and its expression is as follows:
[0083]
[0084] where gamma lv , ρ, g are ...
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Abstract
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