基于飞秒激光制备润滑表面及光响应液滴操控

Preparation of slippery surface based on femtosecond laser toward photo-induced droplet manipulation

  • 摘要: 运用光诱导在润滑剂注入型光滑多孔表面(SLIPS)实现液滴动态操控,具有非接触性和不受时空间限制等显著优势,但传统光响应SLIPS制备过程需要模板转印及氟化处理,操作繁琐且不环保。本文利用飞秒激光正交线扫描和光热响应Fe3O4纳米颗粒制备出仿猪笼草光热响应SLIPS,通过调整单侧近红外光触发位置,利用液滴润湿梯度和内部马兰格尼流,可以实现液滴运动状态和运动路径的动态操控。通过分析Fe3O4含量、润滑剂流变性能及液滴类型对液滴移动速率和响应时间的影响,对制备SLIPS的液滴操控性能进行优化,进而展现仿猪笼草光热响应SLIPS在芯片实验室、微流体反应器、生物医学工程等领域的广泛应用价值。

     

    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 Fe3O4 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 Fe3O4-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.

     

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