Interfacial Properties of Chitosan in Interfacial Shear and Capsule Compression

Abstract

The time-dependent behavior of surface-active adsorption layers at the oil/water interface can dictate emulsion behavior at both the micro- and macroscale. In addition, self-healing behavior of the adsorption layer may benefit emulsion stability subject to large deformation under processing or during final application. We explore the behavior of chitosan, a known hydrophilic emulsifier, which forms nanoparticle aggregates when the concentration of acetate buffer exceeds 0.3 M. We observe a Pickering adsorption layer building and strain-dependent behavior of the chitosan at the medium chain triglyceride oil/water interface. We compare this to the behavior of identical chitosan layers coated on oil droplets via atomic force microscopy colloidal probe compression in both linear and oscillatory compressions. In both interfacial shear rheometry and the capsule compression, a thick, elastic layer with strong time-dependent recovery behavior is observed, suggesting that the layer has some self-healing capabilities.

Polysaccharide-based C-dots and polysaccharide/C-dot nanocomposites: fabrication strategies and applications

“…[89][90][91][92][93] These unique properties have made this material attract much attention for use in various fields such as medicine, pharmaceutical, biotechnology, or food industry. [94][95][96][97][98] The combination of C-dots and chitosan was the beginning of a new chapter in the synthesis of composites with superior features. Table 2 lists various C-dot/ chitosan nanocomposites along with the C-dot source and application of the corresponding nanocomposite.…”