Design of super-paramagnetic bilayer films based on chitosan and sodium alginate

Author(s)

Kloster, Gianina A. ; Moscoso Londono, Oscar ; Pirota, Kleber R. ; Mosiewicki, Mirna A. ; Marcovich, Norma E.

• Document type: Journal article
• Source: CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS; v. 2, p. 11-pg., 2021-12-25.

Abstract

Bilayer films that combine chitosan and alginate, two natural polysaccharides, and magnetic iron oxide nanoparticles (MNPs) were obtained. Physical and microscopic observations revealed that chitosan and alginate interact strongly through their surfaces, which is attributed to the formation of a polyelectrolyte complex at the interface. The diameter of the individual MNPs was about 10 nm, although in the films they appear arranged in clusters with sizes ranging from 23 nm to several times larger that are formed by collapsed individual particles. All bilayers containing MNP behave as super-paramagnetic materials, exhibiting magnetic synergic effects in comparison to single carbohydrate films. Thus, obtained films could find novel and interesting applications as pH responsiveness systems, pad dressings including hyperthermia, adsorption of positive and negative charged pollutants, etc. (AU)

• FAPESP's process: 14/26672-8 - Interface and surface effects in magnetic-metal nanoheterostructures
• Grantee: Oscar Moscoso Londono
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
• Grantee: Pascoal Jose Giglio Pagliuso
• Support Opportunities: Special Projects