1. 南京农业大学工学院，江苏 南京 210031
2. 江苏省智能化农业装备重点实验室，江苏 南京 210031
3. Center for Renewable Carbon, University of Tennessee, Knoxville, TN 37996, USA
Effect of Immersion Process on the Properties and Structure of Cellulose Nanofibril/Silica Composite Aerogels
FU Jing-jing1, 2, HE Chun-xia1, 2*, WANG Si-qun3*
1. College of Engineering Nanjing Agricultural University, Nangjing 210031, China
2. Key Laboratory of Intelligence Agriculture Equipment of Jiangsu Province，Nanjing 210031，China
3. Center for Renewable Carbon, University of Tennessee, Knoxville, TN 37996, USA
Abstract：Cellulose nanofibril (CNF) aerogels combine important properties of conventional silica aerogels with their own excellent biocompatibility and biodegradability, which could be applied in various fields. However, applications for cellulose aerogels have been limited by cellulose’s hygroscopicity. In order to improve the hydrophilicity and comprehensive properties of cellulose aerogels, the simple immersion method was used to introduce silica parties into the cellulose matrix to synthesis cellulose nanofibril/silica composite aerogels. The chemical structure of cellulose aerogel and composite aerogels was analyzed with Fourier transform infrared spectroscopy (FTIR). The microstructure of aerogels was observed by scanning electron microscope (SEM). The physical, mechanical properties and contact angle of aerogels were tested and analyzed. The results show that the peaks of —OH located at 3 340 cm-1 in composite aerogels were all weaker compared with cellulose aerogel, which indicates that the formation of Si-OH due to the Introduction of silica and also lowered the hydrophilicity of cellulose aerogel. The appearance of the peaks of Si—CH3 and Si—O—Si represents the modification of trimethylchlorosilane (TMCS) and the formation of stable chemical bond between cellulose and silica particles. The silica content of the composite aerogels was affected by the immersion time, and in turn affected the density, BET surface area and porosity of aerogels. The composite aerogel had better comprehensive properties when immersed into silica sol for 10 min. It had homogeneous microstructure and hydrophobicity, with contact angle of 152°. It also had good mechanical properties and low density, the compressive modulus and strength of the composite aerogel were 5.91 and 1.38 MPa, respectively. Its density was only 0.1 g·cm-3.
付菁菁，何春霞，王思群. 浸渍过程对纳米纤维素/二氧化硅复合气凝胶结构与性能研究[J]. 光谱学与光谱分析, 2017, 37(07): 2019-2023.
FU Jing-jing, HE Chun-xia, WANG Si-qun. Effect of Immersion Process on the Properties and Structure of Cellulose Nanofibril/Silica Composite Aerogels. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(07): 2019-2023.
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