Hydrothermal Synthesis and Morphological Control of γ-AlOOH Nanorods

doi:10.11944/j.issn.1000-0518.2018.08.180129

Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (8): 932-938.DOI: 10.11944/j.issn.1000-0518.2018.08.180129

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Hydrothermal Synthesis and Morphological Control of γ-AlOOH Nanorods

LÜ Yuzhen^a^b^*(),SUN Qian^a,HAN Qiubo^b^c,SUN Zhen^a,HUANG Meng^b^c,LI Chengrong^b^c

^a School of Energy,Power and Mechanical Engineering
^bState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
^cBeijing Key Laboratory of High Voltage & EMC, North China Electric Power University,Beijing 102206,China;

Received:2018-04-24 Accepted:2018-06-13 Published:2018-07-24 Online:2018-07-24
Contact: LÜ Yuzhen
Supported by:
Supported by the National Natural Science Foundation of China(No.51472084, No.51337003)

Abstract

Abstract:

The morphology of γ-AlOOH, as a precursor to γ-Al₂O₃ in the liquid-phase synthesis system, is closely related with the performance of final product. In this paper, γ-AlOOH nanorods were synthesized by hydrothermal method. The aspect ratio of γ-AlOOH nanorods was modified by changing the concentration of Al³⁺ and the type of base. The crystal structure and morphology of the as-synthesized products were characterized by X-ray diffraction(XRD) and transmission electron microscopy(TEM). The results show that the aspect ratio of γ-AlOOH nanorods can be tuned in the range of 5.9~8.0 with the increase of concentration of Al³⁺, and further adjusted into 8.0~10.0 by changing the type of base. Based on the analysis of the crystallization process, it is believed that the complexation reaction between aluminum ions and hydroxyl groups is accelerated by increasing the concentration of Al³⁺ and the base strength of precipitants. The increase of the content of Al(OH)₃ is beneficial to the formation of γ-AlOOH nuclei and facilitates the oriented attachment of nuclei, leading to a significant increase of aspect ratio of nanorods. The positive impact breakdown strength of transformer oil modified by nano γ-Al₂O₃(volume fraction of 0.1%) obtained by sintering γ-AlOOH nanorods with a length to diameter ratio of 10.0 is 9.9% higher than that of pure oil.

Key words: γ-AlOOH;, nanorod, Al³⁺, type of precipitate, oriented attachment

LÜ Yuzhen, SUN Qian, HAN Qiubo, SUN Zhen, HUANG Meng, LI Chengrong. Hydrothermal Synthesis and Morphological Control of γ-AlOOH Nanorods[J]. Chinese Journal of Applied Chemistry, 2018, 35(8): 932-938.

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Hydrothermal Synthesis and Morphological Control of γ-AlOOH Nanorods

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