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ζ-potential variations of micro-nano sized hexagram-like α-Al2O3 particles

Authors
  • Hai, Chunxi1, 2
  • Zhang, Guotai1, 2, 3
  • Liu, Jianghua4
  • Zhou, Yuan1, 2
  • Dong, Shengde1, 2, 3
  • Zeng, Jinbo1, 2
  • Li, Xiang1, 2
  • Sun, Yanxia1, 2
  • Shen, Yue1, 2
  • 1 Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, 18th Xinning Road, Xining, 810008, People’s Republic of China , Xining (China)
  • 2 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, People’s Republic of China , Xining (China)
  • 3 University of Chinese Academy Sciences, Beijing, 100049, People’s Republic of China , Beijing (China)
  • 4 Shengnuo Optoelectronic Technology (QH) Co. Ltd., Xining, 810000, People’s Republic of China , Xining (China)
Type
Published Article
Journal
Journal of Nanoparticle Research
Publisher
Springer-Verlag
Publication Date
Mar 02, 2020
Volume
22
Issue
3
Identifiers
DOI: 10.1007/s11051-020-04786-x
Source
Springer Nature
Keywords
License
Yellow

Abstract

The relationship between ζ-potential and surface defects of micro-nano sized hexagram-like α-Al2O3 particles was investigated in this paper. The 2D α-Al2O3 particles was prepared by the phase transformation of gibbsite precursor by the following steps during calcination in air: Al(OH)3 → AlOOH→a-Al2O3 → θ-Al2O3 → α-Al2O3. Resulting from the varied intensities of surface defects, as-prepared α-Al2O3 samples have different Eg values around 4.5 eV, which is much narrower than that of bulk α-Al2O3. While benefiting from the interface reaction between surface > AlOH0 and water (>AlOH0 + OH−⇋ > AlO− + H2O), as-prepared α-Al2O3 suspensions can reach their specific pHE values after stirring for 8 h at room temperature. And the measured IEP values of Al2O3-1250°C-2 h, Al2O3-1250°C-3 h, and Al2O3–1300 °C-3 h, which remain 2D morphology, are 7.96, 8.67, and 8.86, respectively. This study is significant and useful for making the industrial applications of α-Al2O3 valid.

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