Tseng Kuo-Hsiung, Yeh Chu-Ti, Chung Meng-Yun, Lin Yur-Shan, Qui Ning
Department of Electrical Engineering, National Taipei University of Technology, Taipei, 10608, Taiwan, ROC.
Innolux Corporation., Southern Taiwan Science Park, Kaohsiung City, 82151, Taiwan, ROC.
Sci Rep. 2021 Oct 14;11(1):20457. doi: 10.1038/s41598-021-99976-5.
This study employed an electric discharge machine (EDM) and the Electrical Spark Discharge Method (ESDM) to prepare silver iodide nanocolloid (AgINC). Povidone-iodine (PVP-I) was dissolved in deionized water to create a dielectric fluid. Silver material was melted using the high temperature generated by an electric arc, and the peeled-off material was reacted with PVP-I to form AgI nanoparticles (AgINPs). Six discharge pulse wave parameter combinations (Ton-Toff) were employed, and the resultant particle size and suspension of the prepared samples were examined. The results revealed that AgINPs were successfully created using the ESDM. When Ton-Toff was set at 90-90 μs, the zeta potential of the AgINC was - 50.3 mV, indicating excellent suspension stability. The AgINC particle size was 16 nm, verifying that the parameters yielded AgINPs with the smallest particle size distribution and highest zeta potential. Ultraviolet-visible spectrum analyser was performed to analyse the samples, and the spectra indicated that the characteristic wavelength was 420 nm regardless of the Ton-Toff values. X-ray diffraction analysis determined that the AgINPs exhibited two crystal structures, namely β-AgI and Ag. Transmission electron microscopy was performed and revealed that the particles were irregularly shaped and that some of the larger particles had aggregated. The crystal structure was determined to be a mixture of Ag and β-AgI, with a lattice spacing of 0.235 nm and 0.229 nm, respectively. The lattice spacing of the Ag was 0.235 nm. X-ray diffraction analysis indicated that the prepared AgINC were composed of only Ag and I; no additional chemical elements were detected.
本研究采用电火花加工机床（EDM）和电火花放电法（ESDM）制备碘化银纳米胶体（AgINC）。将聚维酮碘（PVP-I）溶解于去离子水中制成介电流体。利用电弧产生的高温熔化银材料，剥落的材料与PVP-I反应形成碘化银纳米颗粒（AgINPs）。采用六种放电脉冲波参数组合（Ton-Toff），并对制备样品的最终粒径和悬浮液进行检测。结果表明，利用ESDM成功制备出了AgINPs。当Ton-Toff设置为90 - 90 μs时，AgINC的zeta电位为 - 50.3 mV，表明其具有优异的悬浮稳定性。AgINC粒径为16 nm，证实该参数产生了粒径分布最小且zeta电位最高的AgINPs。对样品进行紫外可见光谱分析仪分析，光谱表明无论Ton-Toff值如何，特征波长均为420 nm。X射线衍射分析确定AgINPs呈现两种晶体结构，即β-AgI和Ag。进行透射电子显微镜分析，结果显示颗粒形状不规则，一些较大颗粒发生了聚集。晶体结构确定为Ag和β-AgI的混合物，晶格间距分别为0.235 nm和0.229 nm。Ag的晶格间距为0.235 nm。X射线衍射分析表明，制备的AgINC仅由Ag和I组成；未检测到其他化学元素。
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