Mechanism of the Removal of Acetylacetone Ligands in Zirconia Wet Gel and Fabrication of Zirconia Aerogel Composites

doi:10.7503/cjcu20210254

Abstract

Abstract:

It was reported that the removal of acac ligands can be accelerated by soaking polyacetylacetonato-zirconium（PAZ） wet gel in organic silane（tetramethyl orthosilicate， tetraethyl orthosilicate） or organic borane（triethyl borate）. Moreover， it was confirmed that soaking wet gel in siliane（borane） can accelerate the removal of acac ligands through infrared spectrum， elemental analysis， X-ray photoelectron spectroscopy， chromatography-mass spectrometry， etc. Meanwhile， the mechanism was be deduced. By soaking PAZ wet gel in organic silane， the gel skeleton was strengthened as well. Therefore， nanoporous ZrO₂ aerogels with high specific surface area could be obtained by inexpensive drying techniques. In addition， to prepare the ultra-lightweight silica fiber/zirconia aerogel（SFZA）， the ZrO₂ aerogel matrix was also composite with ultrafine quartz fiber， which further prevents drying shrinkage. Based on the plate heat flow method the lowest thermal conductivity coefficient of the SFZA was 0.042 and 0.063 W?m^-1?K^-1 at 1000 and 1200 ℃， respectively.

Key words: ZrO₂ aerogel, Composite, Polyacetylacetonatozirconium, Thermal insulation material

CLC Number:

O648

TrendMD:

LI Zhanfeng, LIU Benxue, LIU Xiaochan, WANG Xinqiang, ZHANG Jing, YU Shimo, ZHAO Xinfu, ZHANG Xin’en, YI Xibin. Mechanism of the Removal of Acetylacetone Ligands in Zirconia Wet Gel and Fabrication of Zirconia Aerogel Composites[J]. Chem. J. Chinese Universities, 2021, 42(9): 2904.

Figures/Tables 8

References 29

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Sample	x（%， EA）			x（%， XPS）
Sample	C	H	N	C
PAZ xerogel	16.43	3.50	0.70	48.76
PAZ xerogel modified by TEOS	7.51	2.77	0.56	15.52

Sample	x（%， EA）			x（%， XPS）
Sample	C	H	N	C
PAZ xerogel	16.43	3.50	0.70	48.76
PAZ xerogel modified by TEOS	7.51	2.77	0.56	15.52

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