Influence of Chitosan/Dextran Sulfate Layer-by-Layer Shell on Colloidal Properties of Silver Nanoparticles

Abstract

Colloidal stability of core–shell nanoparticles consisted of silver core and chitosan/dextran sulfate multilayer shell in NaCl and CaCl2 solutions was investigated. The critical concentration of coagulation and the Hamaker constant were calculated depending on the number of bilayers in the shell on the nanoparticle surface. The colloidal stability of the core–shell nanoparticles significantly increases with the shell growth.

A closer physico-chemical look to the Layer-by-Layer electrostatic self-assembly of polyelectrolyte multilayers

“…This methodology has been applied for the encapsulation of a broad range materials (anticancer drugs, anticorrosion agents, insoluble dyes, and inorganic salts), enabling a significant enhancement of the dispersion ability of the drug in aqueous medium, e.g. the stability of silver nanoparticles in saline medium was found to be significantly enhanced by the deposition of a LbL shell of CHI and dextran [351].…”

Chitosan based-nanoparticles and nanocapsules: Overview, physicochemical features, applications of a nanofibrous scaffold, and bioprinting

“…In contrast, the stoichiometric polyelectrolytic complex contains equal quantities of each opposite charge, and the total charge in the resulting complex is zero. In the case of chitosan, various polyelectrolyte complexes can form when the positively charged surface of chitosan interacts with anionic biopolymers such as sodium alginate, pectin, carboxymethylcellulose, chondroitin sulfate, dextran sulfate [75], etc.…”