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

被引：4

作者：

Hai, Chunxi ^{[1
,2
]}

Zhang, Guotai ^{[1
,2
,3
]}

Liu, Jianghua ^{[4
]}

Zhou, Yuan ^{[1
,2
]}

Dong, Shengde ^{[1
,2
,3
]}

Zeng, Jinbo ^{[1
,2
]}

Li, Xiang ^{[1
,2
]}

Sun, Yanxia ^{[1
,2
]}

Shen, Yue ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, 18th Xinning Rd, Xining 810008, Peoples R China

[2] Key Lab Salt Lake Resources Chem Qinghai Prov, Xining, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Shengnuo Optoelect Technol QH Co Ltd, Xining 810000, Peoples R China

来源：

JOURNAL OF NANOPARTICLE RESEARCH | 2020年 / 22卷 / 03期

关键词：

alpha-Al2O3; Micro-nano structure; Phase transformation; Surface defects; zeta-Potential; METAL-OXIDE NANOPARTICLES; PHASE-TRANSFORMATION; AL2O3; PHOTOLUMINESCENCE; POWDERS; FILM;

D O I：

10.1007/s11051-020-04786-x

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The relationship between zeta-potential and surface defects of micro-nano sized hexagram-like alpha-Al2O3 particles was investigated in this paper. The 2D alpha-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 -> theta-Al2O3 -> alpha-Al2O3. Resulting from the varied intensities of surface defects, as-prepared alpha-Al2O3 samples have different E-g values around 4.5 eV, which is much narrower than that of bulk alpha-Al2O3. While benefiting from the interface reaction between surface > AlOH0 and water (>AlOH0 + OH-& x21cb; > AlO- + H2O), as-prepared alpha-Al2O3 suspensions can reach their specific pH(E) values after stirring for 8 h at room temperature. And the measured IEP values of Al2O3-1250 degrees C-2 h, Al2O3-1250 degrees C-3 h, and Al2O3-1300 degrees 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 alpha-Al2O3 valid.

引用

页数：12

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