Four fatty amides were synthesized using coconut and palm oil sources. The chemical structure of the as-prepared fatty acids was confirmed using Fourier Transform Infrared (FT-IR) and ¹H, ¹³C NMR spectroscopy. The effect of different chain lengths and head groups of these compounds on Ag nanoparticles (NPs) synthesis was investigated. Ultraviolet–visible spectroscopic studies showed characteristic absorbance peaks (λ_max ≈ 410 nm). FT-IR results indicated that the surfactant functionalities are responsible for the Ag NPs stability. The effect of fatty amides on the morphology and size distribution of the Ag NPs was investigated using transmission electron microscope (TEM). The TEM micrographs showed the formation of fine spherical morphology due to surfactant-mediated self-assembly with an average particle size of 1–3 nm. Dynamic light scattering (DLS) analysis showed the micellar self-assembly of Ag NPs-fatty amides. The effect of surfactant on the solution behavior was analyzed using surface tension measurements. Cocamide and palm DEA showed relatively low free energy (∆G_mic) values, resulting in smaller particles with good distribution. Finally, the Ag NPs showed outstanding antimicrobial activity against Pseudomonas putida bacteria.

中文翻译：

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棕榈油和椰子油合成的非离子表面活性剂长链和头基对银纳米粒子形成影响的研究

使用椰子油和棕榈油合成了四种脂肪酰胺。^{使用傅里叶变换红外 (FT-IR) 和1} H, ¹³ C NMR 光谱确认所制备的脂肪酸的化学结构。研究了这些化合物的不同链长和头基对银纳米粒子 (NPs) 合成的影响。紫外-可见光谱研究显示特征吸收峰 ( λ _max ≈ 410 纳米）。FT-IR 结果表明表面活性剂官能团是 Ag NPs 稳定性的原因。使用透射电子显微镜 (TEM) 研究了脂肪酰胺对 Ag NPs 的形态和尺寸分布的影响。TEM 显微照片显示由于表面活性剂介导的自组装形成了平均粒径为 1-3 nm 的精细球形形态。动态光散射 (DLS) 分析显示 Ag NPs-脂肪酰胺的胶束自组装。使用表面张力测量分析表面活性剂对溶液行为的影响。椰油酰胺和棕榈 DEA表现出相对较低的自由能 (Δ G _mic) 值，从而产生具有良好分布的较小颗粒。最后，Ag NPs 对恶臭假单胞菌表现出出色的抗菌活性。