The 3D printing process enables to print objects having various functionalities at pre-designed locations in the object. Hereby, we report on the printing of superhydrophobic objects composed of patterns of micropillars. Superhydrophobicity is an important property of surfaces that has applications in various fields such as self-cleaning, drag reduction, increased buoyancy, and air conditioning. Most existing methods for the fabrication of superhydrophobic surfaces are complicated and time-consuming. Here, we performed a simple and cost-effective process for the fabrication of superhydrophobic (SH) objects by Digital Light Processing (DLP) 3D printing. To the best of our knowledge, this is the first study that has used DLP 3D printing to fabricate SH 3D objects without further coating process. We designed a novel ink, which contained non-fluorinated acrylates and Hydrophobic Fumed Silica (HFS). We studied the effects of HFS concentration and pillar-array design for imparting the SH property, which was measured in terms of the contact and rolling angle of water droplets on the surface. As proof of the concept of increased buoyancy by superhydrophobicity, we demonstrated the floatation of the printed SH objects in comparison to their non-SH counterparts even after forcefully submerging them into water.

3D打印过程可以在对象中的预先设计的位置打印具有各种功能的对象。据此，我们报告了由微柱图案组成的超疏水物体的印刷。超疏水性是表面的重要属性，已在各种领域中应用，例如自清洁，减阻，增加的浮力和空调。制造超疏水表面的大多数现有方法是复杂且耗时的。在这里，我们通过数字光处理（DLP）3D打印执行了一种简单且经济高效的工艺来制造超疏水（SH）对象。据我们所知，这是第一项使用DLP 3D打印来制造SH 3D对象而无需进一步涂覆过程的研究。我们设计了一种新颖的墨水，其中包含非氟化丙烯酸酯和疏水气相法二氧化硅（HFS）。我们研究了HFS浓度和柱阵列设计对赋予SH特性的影响，该特性通过水滴在表面上的接触和滚动角度来衡量。作为超疏水性增加浮力的概念的证明，我们证明了已打印的SH对象与非SH对象相比，即使将其强力浸入水中也能漂浮。