Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2022-01-16 , DOI: 10.1016/j.jtice.2022.104212 Manal A. El Sayed 1 , Nahla T. Elazab 2 , Malek Gassoumi 3 , Magdy A.M. Ibrahim 4
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Background
Antimicrobial coatings are one way that could help inhibit the spread of germs. Despite significant research into a variety of antimicrobial coatings with varied formulas, silver-based coatings appear to be the most effective. Electrodeposition is a promising technology to synthesize nanocrystalline silver coatings which have a wide range of applications such as in microelectronics, aerospace, automotive, biotechnology, nanobiotechnology, bioengineering sciences, in addition to its antimicrobial characteristics. Regrettably, cyanide electrolyte which is commonly applied in industry for silver coatings is one of the most hazardous substances, raising serious health and environmental hazards. It is important that seek high environmentally friendly electrolytes alternative to cyanide electrolytes.
Methods
The nanocrystalline silver coatings were successfully synthesized via galvanostatic deposition on stainless steel surface from an environmentally friendly novel bath. The electrochemical measurements were made utilizing linear sweep voltammetry (LCV), and cyclic voltammetry (CV). A high field emission scanning electron microscope (FESEM) and X-ray diffraction analysis (XRD) were used to characterize the obtained silver coatings.
Significant findings
Bright and adherent nanocrystalline Ag coatings (nano-size ranging between 14.8 and 67.6 nm) were synthesized by direct galvanostatic electrodeposition on SS surface from a bath free from cyanide. This environmentally friendly, cyanide-free bath is characterized by its high stability, low cost, and high cathodic current efficiency. The morphology was strongly dependent on the electrolyte composition as well as on the run circumstances. The microhardness of Ag deposited from this bath has a relatively high value (120.2–158.7 kg f mm-2) depending on the applied current density. Furthermore, the nanocrystalline silver coatings formed by these baths are excellent antibacterial agents versus a vast spectrum of gram-positive and gram-negative bacteria, particularly Listeria and Streptococcus bacteria.
中文翻译：
无污染水浴电沉积钢上纳米晶银涂层及其抗菌活性
背景
抗菌涂层是一种有助于抑制细菌传播的方法。尽管对具有不同配方的各种抗菌涂料进行了大量研究，但银基涂料似乎是最有效的。电沉积是一种很有前景的合成纳米晶银涂层的技术，除了具有抗菌特性外，它还具有广泛的应用，如微电子、航空航天、汽车、生物技术、纳米生物技术、生物工程科学。令人遗憾的是，工业上普遍用于银涂层的氰化物电解液是最危险的物质之一，对健康和环境造成严重危害。寻找替代氰化物电解质的高环保电解质非常重要。
方法
纳米晶银涂层通过一种环保新型镀液在不锈钢表面上的恒电流沉积成功合成。利用线性扫描伏安法（LCV）和循环伏安法（CV）进行电化学测量。采用高场发射扫描电子显微镜 (FESEM) 和 X 射线衍射分析 (XRD) 对所得银涂层进行表征。
重要发现
光亮且粘附的纳米晶银涂层（纳米尺寸范围在 14.8 和 67.6 nm 之间）是通过在无氰化物的浴液中直接恒电流电沉积在 SS 表面上合成的。这种环保、无氰化物浴具有稳定性高、成本低和阴极电流效率高的特点。形态很大程度上取决于电解质组成以及运行环境。根据所施加的电流密度，从该浴中沉积的 Ag 的显微硬度具有相对较高的值（120.2–158.7 kg f mm -2 ）。此外，由这些浴液形成的纳米晶银涂层是出色的抗菌剂，可对抗广谱的革兰氏阳性和革兰氏阴性细菌，尤其是李斯特菌和革兰氏阴性菌。链球菌。
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