中文摘要：

在催化剂存在下，使正硅酸乙酯与乙醇-水溶液混合制备硅醇溶胶，迅速将其分别注入到西南桤木和紫椴木材中，令其在室温下反应100min左右得到木材-凝胶，然后采用超临界干燥技术制备木材-SiO2气凝胶。应用FTIR方法对上述溶胶-凝胶法木材-SiO2气凝胶复合材料的结构进行了表征，结果表明，复合材料的FTIR特征基本上是由木材与SiO2气凝胶谱图加合而产生的，没有得到木材与SiO2气凝胶产生化学结合的明确证据，但是观察到气凝胶中Si-OH结构信息（844cm^-1）；部分木材-SiO2气凝胶复合材料试样中1735cm。吸收峰强度明显降低，说明不当的制备工艺条件有可能造成木材中半纤维素发生降解。

英文摘要：

In the presence of a catalyst, ethyl silicate was mixed with ethanol-water solution to form silica sol, which was impregnated into Alnus nepalensis and Tilia amurensis wood as soon as possible. After a reaction time of about 100 min at room temperature, the silica sol was transformed into solgel, which was dried by supercritical drying technique to obtain woodnano-SiO2 aerogel. The chemical structure of wood-nano-SiO2 aerogels were studied by Fourier Transformation Infrared Spectroscopy （FTIR）. Results showed that the FTIR spectrum of wood-nano-SiO2 aerogel composite was basically the sum of the spectra of wood and SiO2 aerogel, no strong chemical bonding between wood and SiO2 aerogel was observed clearly, though the structure of Si-OH was recorded （844 cm^-1 ）. The 1 735 cm^-1 peak in some wood-nano-SiO2 aerogel composites decreased clearly compared with that in the untreated wood, which indicates that improper treating process or treating conditions for the composite preparation might cause wood components, especially hemicelltdose to dehydrate, resulting in wood degradation.