Rafiquee M Z A, Siddiqui Masoom R, Ali Mohd Sajid, Al-Lohedan Hamad A, Al-Othman Z A
Surfactant Research Chair, Department of Chemistry, College of Science, King Saud University, Riyadh, 11541, Saudi Arabia,
Bioprocess Biosyst Eng. 2015 Apr;38(4):711-9. doi: 10.1007/s00449-014-1311-5. Epub 2014 Oct 26.
The present paper describes about the easy, simple and convenient procedure for the synthesis of silver nanoparticles (Ag-NPs) in aqueous solutions by the reduction of silver nitrate with adrenaline. The surfactant molecules of cetyltrimethylammonium bromide (CTABr) and sodium dodecyl ate (SDS) behaved differently during the reduction of Ag(+) ions by adrenaline. The obtained data suggest that the variation of [CTABr] gave a maxima-like curve for rate constant versus [CTABr], while, the values of rate constant decreased with the increase in [SDS]. The addition of surfactant molecules stabilized the Ag-NPs. The UV-Visible spectra were analyzed to deduce the particle size. The calculated sizes of the nanoparticles were further compared by the TEM images. The XRD spectrum confirmed the crystalline nature of silver nanoparticles having the face-centered cubic crystal structure. The edge length of unit cell was found 4.076 Å. The kinetics of formation of Ag-NPs was performed at different concentrations of adrenaline, AgNO3, NaOH and [surfactant]. The values of rate constant were independent on [adrenaline] and [AgNO3]. The increase in [NaOH] increased the rate of agglomeration of silver particles to form Ag-NPs. A linear relationship was obtained for the plot of rate constant versus [NaOH].
本文描述了一种通过肾上腺素还原硝酸银在水溶液中合成银纳米颗粒（Ag-NPs）的简便易行的方法。在肾上腺素还原Ag(+)离子的过程中，十六烷基三甲基溴化铵（CTABr）和十二烷基酸钠（SDS）的表面活性剂分子表现不同。所得数据表明，[CTABr]的变化给出了速率常数与[CTABr]的类似最大值的曲线，而速率常数的值随着[SDS]的增加而降低。表面活性剂分子的添加使Ag-NPs稳定。通过紫外-可见光谱分析来推断粒径。通过透射电子显微镜（TEM）图像进一步比较了计算出的纳米颗粒尺寸。X射线衍射（XRD）光谱证实了具有面心立方晶体结构的银纳米颗粒的晶体性质。发现晶胞的边长为4.076 Å。在不同浓度的肾上腺素、AgNO3、NaOH和[表面活性剂]下进行了Ag-NPs形成的动力学研究。速率常数的值与[肾上腺素]和[AgNO3]无关。[NaOH]的增加提高了银颗粒团聚形成Ag-NPs的速率。速率常数与[NaOH]的关系图得到了线性关系。
