1. Nanostructurally Controlled Hydrogel Based on Small‐Diameter Native Chitin Nanofibers: Preparation, Structure, and Properties
- Author
-
Joby J. Kochumalayil, Qi Zhou, Nicholas Tchang Cervin, Ngesa Ezekiel Mushi, and Lars Berglund
- Subjects
Materials science ,Small diameter ,Compressive Strength ,General Chemical Engineering ,Chitin ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,nanofibers ,Polymer chemistry ,Environmental Chemistry ,General Materials Science ,Porosity ,Full Paper ,Molecular Structure ,Hydrogels ,Full Papers ,021001 nanoscience & nanotechnology ,compression ,0104 chemical sciences ,General Energy ,Chemical engineering ,chemistry ,Nanofiber ,Self-healing hydrogels ,rheology ,hydrogel ,0210 nano-technology - Abstract
Chitin nanofibers of unique structure and properties can be obtained from crustacean and fishery waste. These chitin nanofibers have roughly 4 nm diameters, aspect ratios between 25–250, a high degree of acetylation and preserved crystallinity, and can be potentially applied in hydrogels. Hydrogels with a chitin nanofiber content of 0.4, 0.6, 0.8, 1.0, 2.0, and 3.0 wt % were successfully prepared. The methodology for preparation is new, environmentally friendly, and simple as gelation is induced by neutralization of the charged colloidal mixture, inducing precipitation and secondary bond interaction between nanofibers. Pore structure and pore size distributions of corresponding aerogels are characterized using auto‐porosimetry, revealing a substantial fraction of nanoscale pores. To the best of our knowledge, the values for storage (13 kPa at 3 wt %) and compression modulus (309 kPa at 2 wt %) are the highest reported for chitin nanofibers hydrogels.
- Published
- 2016