Stress-localized durable anti-biofouling surfaces
Stress-localized durable anti-biofouling surfaces
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DOI：
10.1039/c9sm00790c
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发表时间：
2019-08-07
期刊：
影响因子：
3.4
通讯作者：
Ghasemi, Hadi
中科院分区：
文献类型：
--
作者：
Eslami, Bahareh;Irajizad, Peyman;Ghasemi, Hadi
对生物友好型表面的日益增长的需求刺激了新的和不断改进的材料范例的发展。尽管生物友好涂料取得了显著进展，但生物污垢问题仍然是一个关键挑战。除了生物污垢特性外，船体、管道系统和热交换器等机械应力表面需要在海洋环境中具有长期耐久性。在此，我们介绍新一代抗生物污损涂料，具有上级特性和高机械、化学和环境耐久性。在这些表面上，我们已经实施了新的物理应力局部化，以尽量减少生物物种对涂层的粘附。该聚合物材料在高剪切模量基质中含有分散的有机凝胶。在生物物种和有机凝胶颗粒的界面处诱导的界面空化导致应力局部化和生物物种以最小的剪切应力从这些表面脱离。在一项全面的研究中，这些表面的性能进行了评估，包括软和硬生物污垢石莼，细菌，硅藻，藤壶和贻贝，并与国家的最先进的表面进行比较。这些表面显示出小于1%的石莼积累、最小的细菌生物膜生长、2%的硅藻附着、0.02MPa的藤壶附着和7.5N的贻贝附着。这些表面承诺一个新的物理为基础的路线，以解决生物污损问题，并避免生物污损对环境和相关技术的不利影响。
Growing demands for bio-friendly antifouling surfaces have stimulated the development of new and ever-improving material paradigms. Despite notable progress in bio-friendly coatings, the biofouling problem remains a critical challenge. In addition to biofouling characteristics, mechanically stressed surfaces such as ship hulls, piping systems, and heat exchangers require long-term durability in marine environments. Here, we introduce a new generation of anti-biofouling coatings with superior characteristics and high mechanical, chemical and environmental durability. In these surfaces, we have implemented the new physics of stress localization to minimize the adhesion of bio-species on the coatings. This polymeric material contains dispersed organogels in a high shear modulus matrix. Interfacial cavitation induced at the interface of bio-species and organogel particles leads to stress localization and detachment of bio-species from these surfaces with minimal shear stress. In a comprehensive study, the performance of these surfaces is assessed for both soft and hard biofouling including Ulva, bacteria, diatoms, barnacles and mussels, and is compared with that of state-of-the-art surfaces. These surfaces show Ulva accumulation of less than 1%, minimal bacterial biofilm growth, diatom attachment of 2%, barnacle adhesion of 0.02 MPa and mussel adhesion of 7.5 N. These surfaces promise a new physics-based route to address the biofouling problem and avoid adverse effects of biofouling on the environment and relevant technologies.