Eliminating unwanted nanobubbles from hydrophobic solid/liquid interfaces: A case study using magnetoelastic sensors
Eliminating unwanted nanobubbles from hydrophobic solid/liquid interfaces: A case study using magnetoelastic sensors
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DOI：
10.1021/la703572z
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发表时间：
2008-04-15
期刊：
影响因子：
3.9
通讯作者：
Grimes, Craig A.
中科院分区：
文献类型：
--
作者：
Feng, Xinjian;Roy, Somnath C.;Grimes, Craig A.
已知气泡在浸入液体中时在疏水材料的液/固界面处形成（Holmberg，M.; Kdbhle，A.; Garnxs，J.; Morch，K. A.的; Boisen，A. Langmuir 2003，19，10510-10513）。在重力传感器的情况下，在液体-固体界面处随机形成的气泡导致传感器到传感器的再现性差。本文将超亲水性ZnO纳米棒薄膜应用于基于共振的磁致弹性传感器的原始疏水表面。超亲水涂层导致液体完全铺展在表面上，从液体/传感器界面去除不需要的气泡。在空气中测量未涂覆（裸）和ZnO改性的传感器的共振振幅，然后当浸入盐水溶液，乙二醇，或牛血。与裸露的疏水传感器相比，我们发现液体浸没的ZnO纳米棒改性的传感器的共振振幅的标准偏差大幅降低，范围从牛血的27%降低到盐水的67%降低。使用超亲水涂层的策略可以应用于具有类似界面问题的其他系统。
Air bubbles are known to form at the liquid/solid interface of hydrophobic materials upon immersion in a liquid (Holmberg, M.; Kdbhle, A.; Garnxs, J.; Morch, K. A.; Boisen, A. Langmuir 2003, 19, 10510-10513). In the case of Gravimetric sensors, air bubbles that randomly form at the liquid-solid interface result in poor sensor-to-sensor reproducibility. Herein a superhydrophilic ZnO nanorod film is applied to the originally hydrophobic surface of a resonance-based magnetoelastic sensor. The superhydrophilic coating results in the liquid completely spreading across the surface, removing unwanted air bubbles from the liquid/sensor interface. The resonance amplitude of uncoated (bare) and ZnO-modified sensors are measured in air and then when immersed in saline solution, ethylene glycol, or bovine blood. In comparison to the bare, hydrophobic sensors, we find that the standard deviation of the resonance amplitudes of the liquid-immersed ZnO-nanorod-modified sensors decreases substantially, ranging from a 27% decrease for bovine blood to a 67% decrease for saline. The strategy of using a superhydrophilic coating can be applied to other systems having similar interfacial problems.