Preparation and Properties of Novel Superhydrophobic Cellulose Nanofiber Aerogels

The superhydrophobic cellulose nanofiber aerogels were prepared via sol-gel and subsequent freeze-drying with cellulose nanofibers as raw materials and perfluorohexyl ethyl trimethoxysilane and 3-aminopropyl trimethoxysilane as modifying monomers. The effect of volume ratio and total dosage of the t...

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Bibliographic Details
Published in:Journal of nanomaterials 2021-06, Vol.2021, p.1-8
Main Authors: Liu, Guoqing, Li, Jing, Li, Xiaodong, Pan, Xiangjun, Qian, Chao
Format: Article
Language:English
Subjects:
Aerogels
Cellulose
Cellulose fibers
Contact angle
Dimensional stability
Energy
Hydrophobic surfaces
Hydrophobicity
Monomers
Nanofibers
Nanomaterials
Raw materials
Sol-gel processes
Surface energy
Surface structure
Thermal conductivity
Thermal insulation
Thermal stability
X ray photoelectron spectroscopy
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Summary:The superhydrophobic cellulose nanofiber aerogels were prepared via sol-gel and subsequent freeze-drying with cellulose nanofibers as raw materials and perfluorohexyl ethyl trimethoxysilane and 3-aminopropyl trimethoxysilane as modifying monomers. The effect of volume ratio and total dosage of the two modifying monomers on the superhydrophobic properties was investigated, and the property variations of the cellulose nanofibers before and after modification were also characterized by FT-IR, XRD, TGA, SEM, XPS, and laser flash diffusivity apparatus. The results showed that the modifying monomers were successfully grafted onto cellulose nanofibers, and the prepared modified cellulose nanofiber aerogels had higher thermal stability. After modification, a micron-level arrayed three-dimensional grid superhydrophobic surface structure was constructed, and the surface energy was reduced. The prepared aerogels exhibited superhydrophobicity with a water contact angle up to 151° and excellent thermal insulation performance with a thermal conductivity of 0.035 W·m−1·K−1, which displayed promising application potential in the field of thermal insulation and waterproof materials.
ISSN:1687-4110
1687-4129
DOI:10.1155/2021/2631405