Contact surfaces represent a liability for the transmission of microbial contamination, leading to high consumption of detergents and biocides for their care and further increasing the already problematic antimicrobial resistance of microorganisms. This issue could be addressed by the use of antimicrobial nanocomposite coatings. In this research, a polymer nanocomposite of inert poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and water-soluble polyvinylpyrrolidone (PVP) polymers with molybdenum trioxide (MoO₃) nanowires (NWs) was designed and characterised for to its surface properties and antimicrobial potential. The nanocomposite has an inhomogeneous structure with a positively charged and hydrophilic surface. The nanofiller reduces the surface roughness, changes the zeta potential from negative to positive, increases the wetting angle and thermal stability of the blend and maintains the polar β-phase in PVDF-HFP. The high specific surface area of the NWs leads to rapid release into water and causes pH decrease, followed by hydrolysis of PVP polymer and formation of carboxyl acid and ammonium salt. The antimicrobial activity of the nanocomposite inactivates both bacteria and fungi, indicating that the novel nanocomposite is a stable nanostructured coating unfavourable for microorganism colonisation. The antimicrobial activity of this nanocomposite is activated by water, which makes it an intriguing candidate for antimicrobial coating of contact surfaces.

中文翻译：

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新型纳米结构和抗菌 PVDF-HFP/PVP/MoO3 复合材料

接触表面代表了微生物污染传播的倾向，导致清洁剂和杀生物剂的大量消耗，并进一步增加微生物已经存在问题的抗微生物剂耐药性。这个问题可以通过使用抗菌纳米复合涂层来解决。在本研究中，惰性聚偏二氟乙烯-共六氟丙烯 (PVDF-HFP) 和水溶性聚乙烯吡咯烷酮 (PVP) 聚合物与三氧化钼 (MoO ₃) 纳米线 (NW) 的设计和表征是针对其表面特性和抗菌潜力。纳米复合材料具有带正电荷和亲水性表面的不均匀结构。纳米填料降低了表面粗糙度，将 zeta 电位从负变为正，增加了共混物的润湿角和热稳定性，并保持了 PVDF-HFP 中的极性 β 相。NWs 的高比表面积导致快速释放到水中并导致 pH 值下降，随后 PVP 聚合物水解并形成羧酸和铵盐。纳米复合材料的抗菌活性使细菌和真菌均失活，表明新型纳米复合材料是一种稳定的纳米结构涂层，不利于微生物定植。