Preparation of Stable Superamphiphobic Coatings Based on Palygorskite
The challenges posed by liquid-solid infiltration phenomena,such as icing on transmission lines,corrosion on ship surfaces,blockage in oil pipelines,and fogging on car windows,significantly impact both industrial productivity and daily life.Inspired by the natural world,including lotus leaves,pitcher plants,and water striders,researchers have sought to develop biomimetic anti-wetting surfaces to address these issues.Superamphiphobic surfaces,characterized by water and oil contact angles exceeding 150°,have drawn considerable attention for their potential in anti-fouling,anti-sticking,anti-corrosion,self-cleaning,and pipeline transportation applications.However,the inherent fragility of the superamphiphobic surfaces'dual rough structure poses a significant challenge in creating durable superamphiphobic coatings.In this study,micron-sized irregular pal particles were utilized as precursors to develop pal@SiO2-F fillers,with polydimethylsiloxane(PDMS)serving as the binder due to its outstanding bonding strength,corrosion resistance,and elasticity.A nano-scale SiO2 rough structure was in situ synthesized on the pal particles'surface through a modified sol-gel method.Subsequently,the pal@SiO2 particles underwent fluorination using 1H,1H,2H,2H-perfluorodecyltriethoxysilane(PFDTES)to create pal@SiO2-F fillers with a high surface fluorine conten.Layered spraying of the binder and filler yielded PDMS/pal@SiO2-F superamphiphobic coatings with exceptional stability.The surface morphology and chemical composition of the pal@SiO2-F fillers were characterized using scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FT-IR),and X-ray diffraction(XRD).The analyses showed that the originally smooth pal particles acquired notable nano-projections in the form of short rods,which interlocked to form numerous pores on the surface of the pal@SiO2-F.The nano-protrusions on the pal particles are composed of amorphous silica,confirming successful in-situ growth of silica on the pal particle surfaces.The fluorine content in the pal@SiO2-F filler reached 33.14％,illustrating effective grafting of high fluorine groups onto the pal@SiO2 particles.Surface structures of the PDMS/pal@SiO2-F coatings,observed via SEM,reveal that micron-scale pal particles and SiO2 nano-protrusions on the pal surface collaborate to create a dual rough structure.PDMS serves as the binder,ensuring stable adhesion between the coating and substrate while supporting the micron-sized pal particles.This support enables the surface nanostructure to stably capture a gas film attributing to the coating's adaptability across diverse environments.This adaptability is further bolstered by PDMS's chemical inertness and strong adhesion.In anti-wetting tests,the pal@SiO2-F coating demonstrated remarkable repellency towards various liquids with surface tensions(γ≥30.7 mN/m)and maintained its superamphiphobicity through 50 cycles of white mineral oil immersion.After 12h immersion in NaOH,HC1,and NaCl solutions,the coatings displayed oil contact angles(OCA)greater than 130° and water contact angles(WCA)greater than 150°,retaining their superhydrophobicity and oleophobicity under corrosive conditions and effectively shielding the substrate from infiltration and corrosion.Self-cleaning tests further showcased the coatings'ability to shed water droplets,which removed sand from the surface without leaving residues,even at low inclination angles,highlighting the coatings'superior self-cleaning and anti-fouling properties.Consequently,the superamphiphobic coating,with its distinct features and cost-effective production method,holds potential for broad application in various fields.
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