Abstract:
The droplet dynamic manipulation on photo-induced slippery lubricant-infused porous surface (SLIPS) has attracted tremendous attention because of its significant merits of contactless stimulation and excellent spatial and temporal control. However, the traditional fabrication methods by a combination of template-transfer and fluorination for a light-driven SLIPS are tedious and not environment-friendly. Accordingly, a kind of Fe
3O
4 nanoparticles(NPs)-doped nepenthes-inspired photothermal SLIPS was fabricated by femtosecond laser cross-scanning rapidly, which could readily steer diverse liquids towards arbitrary directions by utilizing droplet wettability gradient and internal Malangoni flow in the presence of unilateral near-infrared-irradiation-stimuli. Besides, the droplet manipulation performance was optimized by quantitatively analyzing the influence of Fe
3O
4-doped-content, lubricant rheological performance, diverse liquid species on sliding velocity and response time. The smart manipulator for controllable droplet directions and routes can be utilized to give an impetus to the extensive application of lab-on-a-chip, microfluidics and biomedical engineering and so on.