Smart Materials, Istituto Italiano di Tecnologia, Via Morego 30, 16163-Genova, Italy.
Materials Characterization, Istituto Italiano di Tecnologia, Via Morego 30, 16163-Genova, Italy.
J Colloid Interface Sci. 2020 Aug 15;574:20-32. doi: 10.1016/j.jcis.2020.04.031. Epub 2020 Apr 8.
Certain biobased polymers or natural compounds can be effectively used in superhydrophobic coating formulations to reduce environmental impact of fluorinated compounds and related bioaccumulation and toxicity problems. Many environmental concerns have thus far been raised in relation to toxicity of solvents and C8 fluorine chemicals. Elimination of these important elements from non-wettable coating formulations can jeopardize non-wetting performance significantly. However, intelligent and innovative approaches that introduce ecofriendly resins and compounds in superhydrophobic coating formulations without significantly altering self-cleaning superhydrophobicity are possible and being reported.
Superhydrophobic coatings based on a biomass-derived bioresin polyfurfuryl alcohol (PFA) were prepared. The coatings were made by blending PFA resin with a C6 perfluorinated acrylic copolymer PFAC in solution and subsequent spray coating. Silica nanoparticles were also added in order to repel some common oils. Coating morphology, chemical and thermal properties, biocompatibility and bacterial adhesion properties were studied in detail.
Coatings having 50 wt% bioresin revealed equal water-repellency performance comapred to 100% PFAC-based coatings. Healthy cell growth was maintained on the coatings with no cell toxicity using human cell line, HeLa cells. Superhydrophobic coatings demonstrated very low bacterial adhesion to E. coli, S. aureus and Ps. aeruginosa indicating promising biofouling resistance. The coatings did not require any post thermal annealing. This would cause significant energy savings for large-scale adaptation.
某些生物基聚合物或天然化合物可以有效地用于超疏水涂层配方中，以减少含氟化合物的环境影响和相关的生物累积和毒性问题。迄今为止，许多环境问题都与溶剂和 C8 氟化学品的毒性有关。从非润湿涂层配方中消除这些重要元素会显著危及非润湿性能。然而，在不显著改变自清洁超疏水性的情况下，在超疏水涂层配方中引入环保树脂和化合物的智能和创新方法是可能的，并正在得到报道。
基于生物基生物树脂聚糠醇（PFA）制备了超疏水涂层。该涂层是通过将 PFA 树脂与 C6 全氟丙烯酸共聚物 PFAC 在溶液中混合并随后喷涂制成的。还添加了二氧化硅纳米粒子以排斥一些常见的油。详细研究了涂层的形态、化学和热性能、生物相容性和细菌粘附性能。
含有 50wt%生物树脂的涂层显示出与基于 100%PFAC 的涂层相当的拒水性能。使用人宫颈癌细胞系 HeLa 细胞，涂层上保持了健康细胞的生长，没有细胞毒性。超疏水涂层对大肠杆菌、金黄色葡萄球菌和铜绿假单胞菌的粘附非常低，表明具有良好的抗生物污染性能。该涂层不需要任何后热退火。这将为大规模应用节省大量能源。
