In-Situ Synthesis of Layered Double Hydroxide/Silica Aerogel Composite and Its Thermal Safety Characteristics.
In-Situ Synthesis of Layered Double Hydroxide/Silica Aerogel Composite and Its Thermal Safety Characteristics.
复制标题
层状双氢氧化物/二氧化硅气凝胶复合材料的原位合成及其热安全特性
作者：
Sun, Mengtian;Wang, Yang;Wang, Xiaowu;Liu, Qiong;Li, Ming;Shulga, Yury M.;Li, Zhi
为了调节疏水SiO2气凝胶的热安全性，采用原位溶胶-凝胶法在常压下制备了层状双氢氧化物（LDH）/SiO2气凝胶（SA）复合材料。通过对LDH/SA的红外光谱和物相组成的分析，发现SA和MgAl-LDH之间存在物理结合。N2吸附分析证实MgAl-LDH的引入并没有显著改变LDH/SA的介孔属性。随着MgAl-LDH添加量的增加，LDH/SA复合材料的密度（0.12-0.13 g/cm ~ 3）、导热系数（24.28-26.38 mW/m/K）和比表面积（730.7-903.7 m ~ 2 g）仍保持较低的水平，能够满足保温隔热的要求。TG-DSC分析表明，MgAl-LDH分解过程中的吸热效应和金属氧化物的生成有利于LDH/SA复合材料热稳定性的提高。另外，LDH/SA复合材料的总热值随MgAl-LDH添加量的增加而降低，且均低于纯SA。研究结果表明，MgAl-LDH的掺杂显著提高了LDH/SA复合材料的热安全性，且不影响其诸多优异性能，有利于其在隔热领域的拓展。
To adjust the thermal safety of hydrophobic silica aerogel, layered double hydroxide (LDH)/silica aerogel (SA) composites were prepared by an in-situ sol-gel process at ambient pressure. This study found the physical combination of SA and MgAl-LDH based on the FTIR spectra and phase composition of LDH/SA. The N2 sorption analysis confirms that the introduction of MgAl-LDH does not change the mesoporous attribution of LDH/SA significantly. With the increase in MgAl-LDH addictive content, the low density (0.12–0.13 g/cm3), low thermal conductivity (24.28–26.38 mW/m/K), and large specific surface area (730.7–903.7 m2g) of LDH/SA are still maintained, which can satisfy the requirements of thermal insulation. The TG-DSC analysis demonstrates that the endothermic effects and metal oxides formed during the MgAl-LDH decomposition are beneficial to the improvement of the thermal stability of LDH/SA composites. In addition, it was found that the gross calorific values of LDH/SA composites decrease with an increase in MgAl-LDH addictive content, all of which are lower than that of the pure SA. The research outcomes indicate that the thermal safety of LDH/SA composites is enhanced significantly by doping MgAl-LDH without impairing too many of the excellent properties, which benefits their expansion in the thermal insulation field.
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影响因子：
2.5
作者：
Li, Zhi;Cheng, Xudong;Yang, Hui
通讯作者：
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影响因子：
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作者：
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影响因子：
3.5
作者：
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影响因子：
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Long, Jun;Yang, Zhanhong;Zeng, Xiao
通讯作者：
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热处理对疏水性二氧化硅气凝胶的影响
影响因子：
13.6
作者：
He, Song;Huang, Yajun;Chen, Xianfeng
通讯作者：
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