Sabouni Tabari Rana, Halali Mohammad, A Javadi Akbar, Khanjanpour Mohammad Hassan
Department of Engineering, University of Exeter, Exeter EX4 4QF, UK.
Department of Material Science and Engineering, Sharif University of Technology, Tehran 11365-11155, Iran.
Nanomaterials (Basel). 2020 Oct 21;10(10):2084. doi: 10.3390/nano10102084.
The production of high-purity aluminum nanoparticles (Al-NPs) is challenging due to the highly reactive nature of Al metals. Electromagnetic levitation gas condensation (ELGC) is a promising method to produce high-purity metallic particles as it avoids the interaction between molten metal and refractory-lined, which guarantees the removal of impurities such as oxygen (O). In this research, high-purity Al-NPs were successfully fabricated via ELGC process and fully characterized. The effects of power input and gas flow rate on particle size and distribution were analyzed using field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and dynamic light scattering (DLS). The results showed that the Al-NPs have spherical morphologies with an average diameter of 17 nm and size distribution of NPs is narrow under helium (He) flow rate of 15 L/min at a constant temperature of 1683 ± 10 K. The purity of the NPs was confirmed by utilizing X-ray diffraction (XRD), atomic absorption spectroscopy (AAS), and X-ray fluorescence (XRF). Finally, metal purity of 99.976% and 99.97% was measured by AAS and XRF analyses, respectively. Moreover, it was found that increasing gas flow rate and sample temperature results in a decrease in the particle size. The particle sizes for the Al-NPs obtained under He atmosphere were smaller than those obtained under Ar atmosphere.
由于铝金属具有高反应活性，生产高纯度铝纳米颗粒（Al-NPs）具有挑战性。电磁悬浮气体冷凝法（ELGC）是一种生产高纯度金属颗粒的有前景的方法，因为它避免了熔融金属与耐火衬里之间的相互作用，从而保证了诸如氧（O）等杂质的去除。在本研究中，通过ELGC工艺成功制备了高纯度Al-NPs并进行了全面表征。使用场发射扫描电子显微镜（FESEM）、能量色散光谱（EDS）和动态光散射（DLS）分析了功率输入和气体流速对颗粒尺寸和分布的影响。结果表明，在1683±10 K的恒定温度下，当氦气（He）流速为15 L/min时，Al-NPs具有球形形态，平均直径为17 nm，纳米颗粒的尺寸分布较窄。通过X射线衍射（XRD）、原子吸收光谱（AAS）和X射线荧光（XRF）确定了纳米颗粒的纯度。最后，通过AAS和XRF分析分别测得金属纯度为99.976%和99.97%。此外，发现增加气体流速和样品温度会导致颗粒尺寸减小。在He气氛下获得的Al-NPs的颗粒尺寸小于在Ar气氛下获得的颗粒尺寸。
