Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics, The Ohio State University, 201 West 19th Avenue, Columbus, Ohio 43210-1142, USA.
Langmuir. 2009 Dec 15;25(24):14165-73. doi: 10.1021/la901906h.
Biomimetics, mimicking nature for engineering solutions, provides a model for the development of superhydrophobic/superoleophobic and self-cleaning surfaces. A number of biomimetic superhydrophobic surfaces have been developed by using a hydrophobic coating, surface roughness, and the ability to form air pockets between solid and water. Oleophobic surfaces that have the potential for self-cleaning and antifouling from biological and organic contaminants in both air and water need to be studied. The surface tension of oil and organic liquids is lower than that of water, so to create a superoleophobic surface, the surface energy of the solid surface in air should be lower than that of oil. The wetting behavior of water and oil droplets for hydrophobic/philic and oleophobic/philic surfaces in three-phase interfaces was studied. In order to make the surface oleophobic at a solid-air-oil interface, a material with a surface energy lower than that of oil was used. In underwater applications, the oleophobicity/philicity of an oil droplet in water was studied on the surfaces with different surface energies of various interfaces and contact angles of water and oil droplets in air. A model for predicting the contact angles of water and oil droplets was proposed. To validate the model, the wetting behavior of flat and micropatterned surfaces with varying pitch values were studied. Furthermore, the wetting behavior of the nano- and hierarchical structures found in Lotus plant surfaces and the shark skin replica as an example of aquatic animal were also studied. On the basis of the experimental data and the model, the trends were explained.
仿生学通过模仿自然界来为工程解决方案提供模型，从而开发出超疏水/超疏油和自清洁表面。已经开发出了许多仿生超疏水表面，其方法是使用疏油涂层、表面粗糙度以及在固体和水之间形成气穴的能力。需要研究具有自清洁和防污功能的疏油表面，以防止空气和水中的生物和有机污染物的附着。油和有机溶剂的表面张力低于水的表面张力，因此，要制造出超疏油表面，空气中固体表面的表面能应该低于油的表面能。研究了水和油在三相界面中接触疏水性/亲水性和疏油性/亲油性表面的润湿行为。为了使固体-空气-油界面具有疏油性，使用了表面能低于油的材料。在水下应用中，研究了具有不同表面能的各种界面上油在水中的疏油性/亲油性以及空气中水滴和油的接触角。提出了一种预测水和油滴接触角的模型。为了验证模型，研究了具有不同间距值的平面和微图案化表面的润湿行为。此外，还研究了荷叶表面纳米和分层结构以及鲨鱼皮复制品（作为水生动物的一个例子）的润湿行为。根据实验数据和模型，解释了趋势。
