期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 488, 期 -, 页码 36-43出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2018.02.032
关键词
Cellulose-silica aerogels; Mechanical properties; In-situ synthesis; Sol-gel preparation; Freeze drying
资金
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [11421091]
Cellulose-silica aerogels (CSAs) are organic-inorganic hybrid composites possessing both the porous characteristics and high mechanical properties. In this paper, two kinds of CSAs were in-situ synthesized by facile one-step impregnating cellulose layers directly into silica hydrosols and alcosols, respectively. The porous microstructures and the bonding linkage were investigated by means of Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption-desorption porosimetry. The results show that the silica particles successfully in-situ crosslink on/into the cellulose matrix and maintain the porous characteristics. The regeneration of the CM directly in the alcosols is more beneficial to realize the crosslinking between silica particles and cellulose fibrils. The silica modification tends to increase the mechanical properties over those of the CM due to the additional effects of silica particles impregnating into cellulose matrix.
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