Holzdörfer Uwe, Ali Wael, Schollmeyer Eckhard, Gutmann Jochen S, Mayer-Gall Thomas, Textor Torsten
Deutsches Textilforschungszentrum Nord-West gGmbH, Adlerstr. 1, 47798 Krefeld, Germany.
Physikalische Chemie, Center for Nanointegration Duisburg-Essen, Universität Duisburg-Essen, Universitätsstraße 2, 45117 Essen, Germany.
Molecules. 2024 Aug 9;29(16):3766. doi: 10.3390/molecules29163766.
A concept to prepare a highly hydrophobic composite with self-healing properties has been designed and verified. The new material is based on a composite of a crystalline hydrophobic fluoro wax, synthesized from montan waxes and perfluoroethylene alcohols, combined with spherical silica nanoparticles equipped with a hydrophobic shell. Highly repellent layers were prepared using this combination of a hydrophobic crystalline wax and silica nanoparticles. The novel aspect of our concept was to prepare a ladder-like structure of the hydrophobic shell allowing the inclusion of a certain share of wax molecules. Wax molecules trapped in the hydrophobic structure during mixing are hindered from crystallizing; therefore, these molecules maintain a higher mobility compared to crystallized molecules. When a thin layer of the composite material is mechanically damaged, the mobile wax molecules can migrate and heal the defects to a certain extent. The general preparation of the composite is described and XRD analysis demonstrated that a certain share of wax molecules in the composite are hindered to crystallize. Furthermore, we show that the resulting material can recovery its repellent properties after surface damage.
一种制备具有自修复性能的高疏水性复合材料的概念已被设计并验证。这种新材料基于一种由褐煤蜡和全氟乙烯醇合成的结晶疏水氟蜡复合材料，与配备疏水壳的球形二氧化硅纳米颗粒相结合。使用这种疏水结晶蜡和二氧化硅纳米颗粒的组合制备了高拒水层。我们概念的新颖之处在于制备一种疏水壳的梯状结构，允许包含一定比例的蜡分子。在混合过程中被困在疏水结构中的蜡分子难以结晶；因此，与结晶分子相比，这些分子保持更高的流动性。当复合材料的薄层受到机械损伤时，可移动的蜡分子能够迁移并在一定程度上修复缺陷。描述了复合材料的一般制备方法，XRD分析表明复合材料中一定比例的蜡分子难以结晶。此外，我们表明所得材料在表面受损后能够恢复其拒水性能。
