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Producing superhydrophobic roof tiles

机译：生产超疏水瓦

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Superhydrophobic materials can find promising applications in the field of building. However, their application has been very limited because the synthesis routes involve tedious processes, preventing large-scale application. A second drawback is related to their short-term life under outdoor conditions. A simple and low-cost synthesis route for producing superhydrophobic surfaces on building materials is developed and their effectiveness and their durability on clay roof tiles are evaluated. Specifically, an organic inorganic hybrid gel containing silica nanoparticles is produced. The nanoparticles create a densely packed coating on the roof tile surface in which air is trapped. This roughness produces a Cassie Baxter regime, promoting superhydrophobicity. A surfactant, n-octylamine, was also added to the starting sol to catalyze the sol gel process and to coarsen the pore structure of the gel network, preventing cracking. The application of ultrasound obviates the need to use volatile organic compounds in the synthesis, thereby making a 'green' product. It was also demonstrated that a co-condensation process effective between the organic and inorganic species is crucial to obtain durable and effective coatings. After an aging test, high hydrophobicity was maintained and water absorption was completely prevented for the roof tile samples under study. However, a transition from a Cassie Baxter to a Wenzel state regime was observed as a consequence of the increase in the distance between the roughness pitches produced by the aging of the coating.
机译：超疏水材料可以在建筑领域找到有前途的应用。但是，由于合成路线涉及繁琐的过程，因而阻止了大规模的应用，因此它们的应用受到很大限制。第二个缺点与它们在室外条件下的短期寿命有关。开发了一种在建筑材料上生产超疏水表面的简单且低成本的合成路线，并评估了其有效性和在粘土瓦上的耐久性。具体地，制备了包含二氧化硅纳米粒子的有机无机杂化凝胶。纳米颗粒在屋顶瓦表面上形成了一个紧密堆积的涂层，并在其中捕获了空气。这种粗糙度会产生Cassie Baxter态，从而促进超疏水性。还向起始溶胶中添加了表面活性剂正辛胺，以催化溶胶凝胶过程并粗化凝胶网络的孔结构，从而防止开裂。超声波的应用消除了在合成中使用挥发性有机化合物的需求，从而生产出“绿色”产品。还证明了有机物和无机物之间有效的共缩合过程对于获得耐用和有效的涂料至关重要。经过老化测试后，所研究的屋面瓦样品保持了高疏水性并完全防止了吸水。然而，由于涂层的老化所产生的粗糙度间距之间的距离增加，因此观察到了从卡西百特转变为温泽尔状态的情况。

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