Abstract
A superhydrophobic stainless steel mesh (called “mesh” in short) is an ideal device to solve oil pollution accidents by oil–water separation. However, its widespread application is prevented by complicated preparation, weak durability, and particularly poor mechanical strength. It is well known that the used adhesives play a key role in the mechanical strength of superhydrophobic coatings. In this study, polyvinylidene fluoride (PVDF) and polydimethylsiloxanes (PDMSs) were respectively used as adhesives and lignin-nanocellulose crystal (L-CNC) particles as main structure materials to prepare L-CNC coated superhydrophobic meshes. Moreover, the meshes coated with L-CNC/PVDF and L-CNC/PDMS were compared with respect to the properties of wettability, sandpaper abrasion, oil–water separation, etc. The results showed that the L-CNC/PVDF-coated mesh had a higher water contact angle (WCA = 154.2°) than the L-CNC/PDMS-coated one (WCA = 152.6°), but worse abrasion resistance. Both of them showed high-efficiency oil/water separation with collection rates above 94.5% and stable reusable ability as the oil collection rates for toluene was still above 93.8% after reusing thirty times, meanwhile showing good heat, UV, acid and alkaline resistance properties.
Highlights
Superhydrophobic surfaces originally inspired by lotus leaves[1] are well-known for their excellent functions such as waterproof, anti-fouling, corrosion-resistance, self-cleaning, anti-drag, and oil–water separation[2] and have been widely reported in recent years
The meshes coated with Lignin-coated cellulose nanocrystal (L-CNC)/polyvinylidene fluoride (PVDF) and L-CNC/PDMS were compared with respect to the properties of wettability, sandpaper abrasion, oil–water separation, etc
The results showed that the L-CNC/PVDF-coated mesh had a higher water contact angle (WCA 1⁄4 154.2) than the L-CNC/PDMS-coated one (WCA 1⁄4 152.6), but worse abrasion resistance
Summary
Superhydrophobic surfaces originally inspired by lotus leaves[1] are well-known for their excellent functions such as waterproof, anti-fouling, corrosion-resistance, self-cleaning, anti-drag, and oil–water separation[2] and have been widely reported in recent years. Polyvinylidene fluoride (PVDF) and polydimethylsiloxanes (PDMSs) were respectively used as adhesives and lignin-nanocellulose crystal (L-CNC) particles as main structure materials to prepare L-CNC coated superhydrophobic meshes. The meshes coated with L-CNC/PVDF and L-CNC/PDMS were compared with respect to the properties of wettability, sandpaper abrasion, oil–water separation, etc.
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