Tseng Kuo-Hsiung, Hsieh Chin-Liang, Chung Meng-Yun
Department of Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, R.O.C.
Nanotechnology. 2020 Jun 18;31(42):425704. doi: 10.1088/1361-6528/ab9e28.
Bismuth (Bi) is used to treat certain diseases, however the Bi powder or colloids used in medicine must be nonpolluting and safe. The use of electrical discharge machines (EDMs) to produce nano-Bi powder is a green process. A nonpolluting and safe nano-Bi colloid can be produced swiftly and easily in deionized water using the electrical spark discharge method, adjusting the discharge pulse width T , T and the discharge current I of the EDM. Transmission electron microscopy (TEM), energy-dispersive x-ray spectroscopy, the Zetasizer technique, ultraviolet-visible spectroscopy (UV-Vis), and other techniques were used to analyze a nano-Bi colloid prepared under various discharge parameters to optimize the preparation of Bi nanoparticles (Bi-NPs) using EDMs. The results of this study indicated that Bi-NP colloids were successfully prepared using EDM. TEM images revealed that the NPs were smaller than 50 nm with only the Bi element in the colloid. Furthermore, the zeta potential of the nano-Bi colloid exceeded 30 mV, which indicated that the suspension of the colloid was excellent. A UV-Vis absorption peak was observed at approximately 234-237 nm.
铋（Bi）用于治疗某些疾病，然而医学中使用的铋粉或胶体必须无污染且安全。使用电火花加工机床（EDM）生产纳米铋粉是一种绿色工艺。通过电火花放电法，调节电火花加工机床的放电脉冲宽度T、T和放电电流I，可在去离子水中快速轻松地制备无污染且安全的纳米铋胶体。使用透射电子显微镜（TEM）、能量色散X射线光谱、Zetasizer技术、紫外可见光谱（UV-Vis）等技术分析在各种放电参数下制备的纳米铋胶体，以优化利用电火花加工机床制备铋纳米颗粒（Bi-NPs）的工艺。本研究结果表明，利用电火花加工机床成功制备了Bi-NP胶体。TEM图像显示，纳米颗粒小于50 nm，胶体中仅含铋元素。此外，纳米铋胶体的zeta电位超过30 mV，这表明胶体的悬浮性极佳。在约234 - 237 nm处观察到一个UV-Vis吸收峰。
