立方氧化锆
氢氧化铵
催化作用
傅里叶变换红外光谱
材料科学
醋酸
环境压力
核化学
化学工程
无机化学
化学
有机化学
陶瓷
复合材料
工程类
物理
热力学
作者
Uzma K.H. Bangi,Tayyab Ali,Hyung Ho Park
标识
DOI:10.1002/masy.202100013
摘要
Abstract The experimental results on the ambient pressure dried zirconia xerogels and aerogels using various catalysts are reported here. The catalysts (acid and base) have the major impact on the hydrolysis and polycondensation of the precursor solution. Therefore, zirconia xerogels and aerogels are synthesized using various catalysts such as ammonium hydroxide (NH 4 OH), ammonium fluoride (NH 4 F), hydrochloric acid (HCl), acetic acid (CH 3 COOH), and citric acid (C 6 H 8 O 7 ) via ambient pressure drying. The influence of these catalysts on the physical and structural characteristics of zirconia is studied by measuring the bulk density, Fourier transform infrared (FTIR), thermo gravimetric‐differential scanning calorimetric (TG‐DSC), as well as X‐ray diffraction analyses. During the synthesis, the molar ratio of ZrPro:PrOH:Acac.:H 2 O:HMDZ is kept fixed to 1:27:0.39:3.6:3.3, respectively. Among all zirconia samples, xerogels catalyzed using ammonium fluoride and acetic acid are observed to be low dense (~0.67 g cc −1 ). Moreover, the corresponding zirconia aerogels possess lower density (0.26 g cc −1 ) than xerogels. FTIR spectra reveal the high peak intensity of C‐H, Si‐C, and Zr‐O‐Si chemical bonds in zirconia xerogels and aerogels manifesting their hydrophobic characteristics. The zirconia xerogels and aerogels retain their hydrophobicity up to around 400 °C as confirmed from the TG‐DSC analysis. Further, the X‐ray diffractogram indicates the amorphous nature of the zirconia xerogels and aerogels.
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