Figure 3 from Synthesis of Cu(OH)₂ nanowires modified by Fe₃O₄@SiO₂ nanocomposite via green and innovative method with antibacterial activity and investigation of magnetic behaviours

In this study, green synthesis of modified Cu(OH)₂ nanowires by Fe₃O₄@SiO₂ core–shell nanospheres was easily performed via chemical reduction. In other words, the direct coating of Cu(OH)₂ on Fe₃O₄@SiO₂ was successfully realized without the extra complicated procedures. Various concentrations of synthesized nanocomposites were tested on pathogenic and nosocomial bacteria. In this study, the structural information and characterization of Fe₃O₄@SiO₂/Cu(OH)₂ nanowires (FSCNWs) were obtained using FE-SEM, FT-IR, EDX and X-ray diffraction. This nanocomposite can effectively kill important infectious bacteria, including <i>S. aureus</i>, <i>E. coli Staphylococcus saprophyticus</i>, <i>Pseudomonas aeruginosa</i> and <i>Klebsiella pneumoniae</i>. Studies have shown that FSCNW nanocomposites affect common antibiotic-resistant bacteria. This result confirms the function of FSCNW as an effective, beneficial and environmentally friendly antibacterial agent that can used in a wide range of applications in medicine. FSCNWs can be separated conveniently from bacteria-containing solutions using a magnet. Compared to nanocomposites based on other metals such as silver and gold, the use of FSCNWs in water treatment has been recommended because of the precursor of copper for its low price and less toxicity. In addition to its special properties such as mild reaction conditions, green synthesis methods, admissible magnetic properties, easy separation, high antibacterial activity and beneficial efficiency.本研究通过化学还原法，以四氧化三铁@二氧化硅（Fe₃O₄@SiO₂）核壳纳米球为模板，简便实现了改性氢氧化铜（Cu(OH)₂）纳米线的绿色合成。换言之，本研究无需额外复杂步骤，即可成功将氢氧化铜（Cu(OH)₂）直接包覆于四氧化三铁@二氧化硅（Fe₃O₄@SiO₂）表面，制得Fe₃O₄@SiO₂/氢氧化铜（Cu(OH)₂）纳米线（FSCNWs）。本研究采用场发射扫描电子显微镜（FE-SEM）、傅里叶变换红外光谱（FT-IR）、能量色散X射线光谱（EDX）以及X射线衍射技术，对FSCNWs的结构信息与表征结果进行了获取与分析。随后，针对致病菌与医院感染细菌，测试了不同浓度的该纳米复合材料的抑菌效果。实验结果表明，该纳米复合材料可有效杀灭多种重要传染性病原菌，包括金黄色葡萄球菌（S. aureus）、大肠杆菌（E. coli）、腐生葡萄球菌（Staphylococcus saprophyticus）、铜绿假单胞菌（Pseudomonas aeruginosa）以及肺炎克雷伯菌（Klebsiella pneumoniae）。研究证实，FSCNW纳米复合材料对常见的抗生素耐药细菌同样具有抑制作用。上述结果验证了FSCNWs作为一种高效、环保且安全的抗菌剂的功能，可广泛应用于医药领域。此外，借助外置磁铁即可便捷地从含菌溶液中分离FSCNWs。相较于银、金等其他金属基纳米复合材料，由于铜前驱体价格低廉且毒性更低，因此FSCNWs被推荐应用于水处理领域。该材料还具备诸多优异特性，包括温和的反应条件、绿色合成工艺、优异的磁性能、便捷的分离性能、高抗菌活性以及良好的应用效能。