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All-graphene-based open fluidics for pumpless, small-scale fluid transport via laser-controlled wettability patterning
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-10-16 , DOI: 10.1039/d0nh00376j Lucas S. Hall 1, 2, 3, 4 , Dohgyu Hwang 2, 3, 4, 5 , Bolin Chen 1, 2, 3, 4 , Bryan Van Belle 1, 2, 3, 4 , Zachary T. Johnson 1, 2, 3, 4 , John A. Hondred 1, 2, 3, 4 , Carmen L. Gomes 1, 2, 3, 4 , Michael D. Bartlett 2, 3, 4, 5 , Jonathan C. Claussen 1, 2, 3, 4
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-10-16 , DOI: 10.1039/d0nh00376j Lucas S. Hall 1, 2, 3, 4 , Dohgyu Hwang 2, 3, 4, 5 , Bolin Chen 1, 2, 3, 4 , Bryan Van Belle 1, 2, 3, 4 , Zachary T. Johnson 1, 2, 3, 4 , John A. Hondred 1, 2, 3, 4 , Carmen L. Gomes 1, 2, 3, 4 , Michael D. Bartlett 2, 3, 4, 5 , Jonathan C. Claussen 1, 2, 3, 4
Affiliation
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Open microfluidics have emerged as a low-cost, pumpless alternative strategy to conventional microfluidics for delivery of fluid for a wide variety of applications including rapid biochemical analysis and medical diagnosis. However, creating open microfluidics by tuning the wettability of surfaces typically requires sophisticated cleanroom processes that are unamenable to scalable manufacturing. Herein, we present a simple approach to develop open microfluidic platforms by manipulating the surface wettability of spin-coated graphene ink films on flexible polyethylene terephthalate via laser-controlled patterning. Wedge-shaped hydrophilic tracks surrounded by superhydrophobic walls are created within the graphene films by scribing micron-sized grooves into the graphene with a CO2 laser. This scribing process is used to make superhydrophobic walls (water contact angle ∼160°) that delineate hydrophilic tracks (created through an oxygen plasma pretreatment) on the graphene for fluid transport. These all-graphene open microfluidic tracks are capable of transporting liquid droplets with a velocity of 20 mm s−1 on a level surface and uphill at elevation angles of 7° as well as transporting fluid in bifurcating cross and tree branches. The all-graphene open microfluidic manufacturing technique is rapid and amenable to scalable manufacturing, and consequently offers an alternative pumpless strategy to conventional microfluidics and creates possibilities for diverse applications in fluid transport.
中文翻译：
基于全石墨烯的开放式流体技术，可通过激光控制的润湿性图案进行无泵小规模流体输送
开放式微流体已成为传统微流体的一种低成本，无泵替代策略，可用于流体输送，可用于包括快速生化分析和医学诊断在内的多种应用。然而，通过调节表面的润湿性来产生开放的微流体通常需要复杂的无尘室工艺，这对于可扩展的制造是不适合的。在本文中，我们提出了一种通过控制激光在柔性聚对苯二甲酸乙二醇酯上旋涂的石墨烯油墨膜的表面润湿性来开发开放式微流体平台的简单方法。通过用CO 2将微米级的凹槽划入石墨烯，可在石墨烯薄膜内形成被超疏水壁包围的楔形亲水轨迹。激光。这种划刻工艺用于制造超疏水壁（水接触角约160°），该壁描绘了石墨烯上的亲水迹线（通过氧等离子体预处理产生），用于流体传输。这些全石墨烯开放的微流径能够以7mm的仰角在水平面上和上坡方向上以20 mm s -1的速度传输液滴，并在分支的交叉分支和树枝中传输流体。全石墨烯开放式微流体制造技术快速且适合于可扩展的制造，因此提供了常规微流体替代的无泵策略，并为流体运输中的各种应用创造了可能性。
更新日期：2020-11-27
中文翻译：
基于全石墨烯的开放式流体技术，可通过激光控制的润湿性图案进行无泵小规模流体输送
开放式微流体已成为传统微流体的一种低成本，无泵替代策略，可用于流体输送，可用于包括快速生化分析和医学诊断在内的多种应用。然而，通过调节表面的润湿性来产生开放的微流体通常需要复杂的无尘室工艺，这对于可扩展的制造是不适合的。在本文中，我们提出了一种通过控制激光在柔性聚对苯二甲酸乙二醇酯上旋涂的石墨烯油墨膜的表面润湿性来开发开放式微流体平台的简单方法。通过用CO 2将微米级的凹槽划入石墨烯，可在石墨烯薄膜内形成被超疏水壁包围的楔形亲水轨迹。激光。这种划刻工艺用于制造超疏水壁（水接触角约160°），该壁描绘了石墨烯上的亲水迹线（通过氧等离子体预处理产生），用于流体传输。这些全石墨烯开放的微流径能够以7mm的仰角在水平面上和上坡方向上以20 mm s -1的速度传输液滴，并在分支的交叉分支和树枝中传输流体。全石墨烯开放式微流体制造技术快速且适合于可扩展的制造，因此提供了常规微流体替代的无泵策略，并为流体运输中的各种应用创造了可能性。
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