Journal
APPLIED SURFACE SCIENCE
Volume 396, Issue -, Pages 1220-1225Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2016.11.116
Keywords
Chitosan; Selective oxidation; Aerogel; Controllable morphology; Mechanistic course
Categories
Funding
- National Natural Science Foundation of China [51302317]
- Natural Science Foundation of Hunan Province [14JJ3008]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2016B002]
- Program for Science and Technology Innovative Team in Colleges of Hunan Province
- Program for Technology Innovative Group of National University of Defense Technology
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Naturally occurring polymer-based aerogels have myriad practical utilizations due to environmentally benign and fruitful resources. However, engineering morphology-controllable biomass aerogels still represents a great challenge. Here we present a facile solution to synthesize chitosan aerogels having distinguished textures by reacting oxidized chitosan with formaldehyde and chitosan sol. In more detail, chitosan was chemically oxidized using two types of oxidation agents such as ammonium persulphate (SPD) and sodium periodate (APS) to obtain corresponding oxidized chitosan, subsequently cross-linked with chitosan solution containing formaldehyde to harvest SPD-oxidized chitosan aerogels (SCAs) and APS-SPD-oxidized ones (ASCAs) after aging, solvent exchange and supercritical drying processes. We found that the morphologies of as-prepared chitosan aerogels are strongly dependent upon the oxidation pattern towards chitosan. The structural textures of SCAs and ASCAs appear nanoflake-like and nanofiber-like structures, which may be related to spatial freedom of active groups located in chitosan. Selected area electron diffraction analysis reveals that the crystalline properties of chitosan aerogels generally appear the serious deterioration comparing to raw chitosan owing to their interconnected skeletal structure formation. The occurrence of characteristic groups displays cross-linked chain construction by using chemical state measurements such as FT-IR and XPS. Further, a plausible mechanism for controlling morphology of chitosan aerogels is also established. This new family of method for creation of chitosan aerogels may open up a perspective for biomass aerogels with controllable textures. (C) 2016 Elsevier B.V. All rights reserved.
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