CUED Publications database

A method for top down preparation of chitosan nanoparticles and nanofibers.

Wijesena, RN and Tissera, N and Kannangara, YY and Lin, Y and Amaratunga, GAJ and de Silva, KMN (2014) A method for top down preparation of chitosan nanoparticles and nanofibers. Carbohydr Polym, 117. pp. 731-738. ISSN 0144-8617

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Abstract

A method of top down preparation of chitosan nanoparticles and nanofibers is proposed. Chitin nanofibrils (chitin NFs) were prepared using ultrasonic assisted method from crab shells with an average diameter of 5 nm and the length less than 3 μm as analyzed by atomic force microscopy and transmission electron microscopy. These chitin nanofibers were used as the precursor material for the preparation of chitosan nanoparticles and nanofibers. The degree of deacetylation of these prepared chitosan nanostructures were found to be approximately 98%. In addition these chitosan nanostructures showed amorphous crystallinity. Transmission electron microscopic studies revealed that chitosan nanoparticles were roughly spherical in nature and had diameters less than 300 nm. These larger particles formed through self-assembly of much smaller 25 nm particles as evidenced by the TEM imaging. The diameter and the length of the chitosan nanofibers were found to be less than 100 nm and 3 μm respectively. It is envisaged that due to the cavitation effect, the deacetylated chitin nanofibers were broken down to small pieces to form seed particles. These seed particles can then be self-assembled to form larger chitosan nanoparticles.

Item Type: Article
Uncontrolled Keywords: Chitin nanofibers Chitosan nanofibers Chitosan nanoparticles Top down Ultrasonication Chitin Chitosan Nanofibers Nanoparticles Nanotechnology
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 20:03
Last Modified: 13 Apr 2021 09:03
DOI: 10.1016/j.carbpol.2014.10.055