贻贝仿生超疏水人工彩砂的构建与性能表征

Construction and performance characterization of mussel-inspired superhydrophobic artificial colored sand

摘要:

彩砂作为建筑涂料的核心骨料,其功能性不仅增加附加价值,亦会强化使用寿命。受贻贝启发,对表面惰性强的沙漠风积沙进行聚多巴胺活化处理,进一步以氰酸基为联结点形成聚多巴胺、羟基丙烯酸与超疏水粒子的交互式网络结构,负载在风积沙表面制备出超疏水人工彩砂Sand@PDA@SPO。通过SEM、FTIR对Sand@PDA@SPO表面形貌与成分结构进行了表征,对其超疏水性、耐酸碱后的疏水稳定性、热稳定性、防冰性能进行了评价。结果显示,Sand@PDA@SPO的WCA最高可达152.8°,强酸强碱(pH=1和pH=14)与温度(240℃)下依旧显示出稳定的超疏水性能。显著拓宽了沙漠风积沙的应用范围,为推动环境保护和自然资源的可持续利用提供了新的思路。

Abstract:

As the core aggregate in architectural coatings, colored sand not only adds functional value but also enhances service life. Inspired by mussels, desert aeolian sand—which has a highly inert surface—was activated via polydopamine treatment. Cyanate groups were then used as linking points to form an interactive network structure integrating polydopamine, hydroxy acrylic acid, and superhydrophobic particles. This structure was loaded onto the aeolian sand surface to prepare superhydrophobic artificial colored sand, denoted as Sand@PDA@SPO. The surface morphology and compositional structure of Sand@PDA@SPO were characterized using SEM and FTIR. Its superhydrophobicity, hydrophobic stability after acid/alkali resistance testing, thermal stability, and anti-icing performance were evaluated. Results show that Sand@PDA@SPO achieves a water contact angle (WCA) of up to 152.8°. It maintains stable superhydrophobicity even under strong acid (pH=1), strong alkali (pH=14), and high-temperature (240°C) conditions. This work significantly broadens the application scope of desert aeolian sand and provides new insights for advancing environmental protection and sustainable utilization of natural resources.