Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 4, Pages 2732-2740Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b10985
Keywords
cellulose nanofibrils; hydrophobic; aerogel; styrene-acrylic copolymer; oil absorption
Funding
- Renewable Bioproducts Institute at Georgia Tech
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Aerogels based on cellulose nanofibrils (CNFs) have been of great interest as absorbents due to their high absorption capacity, low density, biodegradability, and large surface area. Hydrophobic aerogels have been designed to give excellent oil absorption tendency from water. Herein, we present an in situ method for CNF surface modification and hydrophobic aerogel preparation. Neither solvent exchange nor fluorine chemical is used in aerogel preparations. The as prepared hydrophobic aerogels exhibit low density (23.2 mg/cm(-3)), high porosity (98.5%), good flexibility, and solvent induced shape recovery property. Successful surface modification was confirmed through field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and water contact angle measurements. The hydrophobic aerogels show high absorption capacities for various oils, depending on liquid density, up to 47X their original weight but with low water uptake (<0.5 g/g aerogel).
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