Thermodynamics of Wettability: A Physical Chemistry Laboratory Experiment
Thermodynamics of Wettability: A Physical Chemistry Laboratory Experiment
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DOI：
10.1021/acs.jchemed.2c00243
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发表时间：
2022-06-28
影响因子：
3
通讯作者：
Banerjee, Sarbajit
中科院分区：
文献类型：
--
作者：
Davidson, Rachel D.;O'Loughlin, Thomas E.;Banerjee, Sarbajit
在这个实验室实验中，学生们对一系列表面进行修饰，并探索不同的表面化学和质地对不同探针液的润湿性的影响。学生首先利用手机摄像头制作一个简单的接触角测角仪。接下来，他们对比了烷基硅烷功能化的平板玻璃基板和氟化烷基硅烷基板的润湿性，并使用Owens/Wendt图计算了表面自由能。随后，他们合成了作为坚固织构元素的氧化锌四脚，并将四脚喷雾沉积到不锈钢网上以形成分层织构，在随后的表面功能化后产生超疏水和憎油表面。这一系列实验使他们能够研究纹理表面偏离杨氏方程的方式，并生动地说明了表面润湿性的热力学。实验室活动还为说明自由能景观提供了一个引人注目的视觉类比，并成为展示表面化学在中游石油运输基础设施方面的作用的切实手段。
In this laboratory experiment, students modify a series of surfaces and explore the effects of varying surface chemistry and texture on wettability by different probe liquids. Students begin by building a simple contact angle goniometer utilizing their mobile phone cameras. Next, they contrast the wettability of planar glass substrates functionalized with alkyl silanes and fluorinated alkyl silanes and calculate surface free energies using Owens/Wendt plots. Subsequently, they synthesize ZnO tetrapods as robust textural elements and spray deposit the tetrapods onto stainless steel meshes to develop hierarchical texturation, which upon subsequent surface functionalization yields superhydrophobic and oleophobic surfaces. The series of experiments allow them to investigate the manner in which textured surfaces deviate from Young's equation and provide a vivid illustration of the thermodynamics of surface wettability. The laboratory exercise further provides a striking visual analogy for illustrating free energy landscapes and serves as a tangible means to demonstrate the role of surface chemistry with regards to the midstream oiltransportation infrastructure.