Determination of Hydrodynamic Parameters of Chitosan Stabilized Bimetallic Nanoparticles

Abstract

The hydrodynamic characteristics of bimetallic Ag/Cu and Co/Ag nanopar

ticles stabilized by chitosan were determined. The polydispersity index

and the diameter of nanoparticles were observed to decrease in contrast to

the original polymer during the creation of chitosan stabilized bimetallic

nanoparticles, decreasing from 0.342 to 0.12±0.04 and 2.5 micron to 180

nm, respectively. However, the diffusion coefficient of chitosan was in

creased from 0.2 cm2 /s to 2.71 cm2 /s during the production of stable bime

tallic nanoparticles. The lack of absorption bands at 500 nm and 700 nm-

900 nm in the UV spectra of the samples suggests that in the presence of

a reducing agent, copper (II) and cobalt (II) ions undergo full reduction.

The relationship between the synthesis conditions and the kind of structure

of bimetallic nanoparticles “core-shell” has been discovered. Silver atoms

have been shown to be both a core and a shell, depending on the synthesis

conditions and chemical nature of metal ions.