Fabrication Of Superamphiphobic Structure On Ni Surface And Its Wettability

Due to its special ability to repel water and oil,superamphiphobic structure is endowed with excellent stain resistance,anti-freezing and anti-corrosion properties.Hence,it has broad application prospects in self-cleaning coating,bio-chip,micro-fluid transportation,anti-fogging surface,and so on.As a commonly used engineering material,nickel has been widely applied to coating for optical devices,battery elements and various sophisticated structures,owing to its good plasticity,corrosion resistance and especial magnetic property.Constructing superamphiphobic structures on Ni surface can effectively improve the reliability and service life of the devices,which is extraordinary valuable to study on.Hence,we fabricated nanostructure,micro-structure and hierarchical micro-/nanostructure with superamphiphobicity by a combination of chemical deposition and electrical deposition.The largest water contact angle reached 165.1?,while the largest oil contact angle reached 158.5?.By comparing the nickel nanocone structures before and after the PFOTS(1H,1H,2H,2H-Perfluorooctyltrichlorosilane)immersion,we concluded the mechanism of the surface modification,and further emphasized low surface energy for the construction of superamphiphobic structures.Meanwhile,we successfully clarified the necessity of micro-and nanostructure to an extra-large solid-liquid contact angle,by the comparison among the plain Ni surface,nickel nanocone structures and nickel micro-cone structures.While the nanocone and micro-cone superamphiphobic structures are liquid-adhesive,the micro-/nanostructure superamphiphobic structure is liquid-repellent,exhibiting as ultralow sliding angle(?0?)and droplet rebounding without liquid residue.By comparing the single-scaled and dual-scaled superamphiphobic structures,we concluded that the composite structural feature is the key to achieve high liquid repellency.Both microand nanostructures are capable of trapping air within arrays.Those air cushions kept between the gaps at micro level hold up the droplets from permeation,while those formed between the interspaces of nanostructures further minimize the solid-liquid contact.The existence of supportive cushions were further ascertained intuitively at water-solid-oil systems in this work.In addition,the enduring reliability in acid,neutral salty,alkali conditions and high-temperature environment,along with the superior anti-corrosion performance in simulated sea-water solution of the superamphiphobic micro-/nanostructure were also demonstrated.The preparation methods for various superamphiphobic structures on Ni surface established on the investigations in this work are low-cost,easy-to-conduct and scalable for industrial fabrication,which provides new insights into the design of superamphiphobic structures.