Programmable wettability on photocontrolled graphene film.
Programmable wettability on photocontrolled graphene film.
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DOI：
10.1126/sciadv.aat7392
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发表时间：
2018-09
期刊：
影响因子：
13.6
通讯作者：
Zhao Y
中科院分区：
文献类型：
--
作者：
Wang J;Gao W;Zhang H;Zou M;Chen Y;Zhao Y
我们制备了一种具有可编程润湿性的石蜡注入多孔石墨烯膜，用于时空液滴操作。具有特定润湿性的表面材料在从科学到工业的各个领域发挥着重要作用。我们提出了一种具有可编程润湿性的新型石蜡注入多孔石墨烯薄膜（PIPGF）。由于石墨烯的光热性质，在近红外（NIR）光的照射下，PIPGF中的石蜡在液体和固体之间发生转变。因此，我们赋予薄膜在光滑和粗糙表面之间动态和可逆的过渡，作为远程可调的润湿性。此外，随着近红外掩模的集成，石蜡可以在PIPGF上以相应的模式熔化，这为滑动液滴形成了特殊的流动通道。因此，PIPGF可以通过灵活地改变近红外掩模，为液滴的时空控制提供可编程的润湿性途径。我们展示了这些可编程的润湿性途径，不仅简化了微板和微滴微阵列技术中的液体处理，而且还为不同的目的提供了独特的微流控微反应器，例如实际的血型诊断。这些特征表明，光可控PIPGF将适用于各种应用，如微流体系统、芯片实验室设置和液滴操作。
We fabricated a paraffin-infused porous graphene film with programmable wettability for the spatiotemporal droplet manipulation. Surface materials with specific wettability play important roles in a wide variety of areas from science to industry. We present a novel paraffin-infused porous graphene film (PIPGF) with programmable wettability. Because of graphene’s photothermal property, the paraffin in the PIPGF was in transition between liquid and solid in response to near-infrared (NIR) light irradiation. Thus, we imparted the film with a dynamic and reversible transition between a slippery and a rough surface as the remotely tunable wettability. In addition, with the integration of NIR masks, the paraffin could melt at corresponding patterns on the PIPGF, which formed special flow pathways for the slipping droplets. Therefore, the PIPGF could provide programmable wettability pathways for the spatiotemporal droplet manipulation by flexibly changing the NIR masks. We demonstrated these programmable wettability pathways to not only simplify liquid handling in the microplates and droplet microarrays technology but also to provide distinctly microfluidic microreactors for different purposes, such as practical blood grouping diagnosis. These features indicated that the photocontrollable PIPGF would be amenable to a variety of applications, such as microfluidic systems, laboratory-on-a-chip settings, and droplet manipulations.
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