Abstract
Monodisperse silver nanoparticles were synthesized by a new developed method via reaction of AgNO3 and oleic acid with the addition of a trace amount of Fe3+ ions. Emulsion polymerization at room temperature was employed to prepare a core-shell silver nanoparticle with controllable particle size. N,N'-methylenebisacrylamide (MBA) and potassium peroxydisulfate (KPS) were used as a crosslinker, and as redox initiator system, respectively for crosslinking polymerization. The structure and morphology of the silver nanogels were characterized by Fourier transform infrared spectroscopy (FTIR), transmission and scanning electron microscopy (TEM and SEM). The effectiveness of the synthesized compounds as corrosion inhibitors for steel in 1 M HCl was investigated by various electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Monolayers of silver nanoparticle were self-assembled on the fresh active surface of the steel electrode and have been tested as a corrosion inhibitor for steel in 1 M HCl solution. The results of polarization measurements showed that nanogel particles act as a mixed type inhibitor.
Highlights
Amphiphilic metal nanoparticles have been exploited for applications in antibacterial materials, medicine and catalysis due to their unique optical electronic and chemical properties [1,2,3]
The measured contact angle of water on the AgNPs coated with OA is 85.1. These results indicated that the surface of the silver nanoparticles capped with oleic acid is hydrophobic, which resulted in difficulty to be wetted by water
The values of inhibition efficiency obtained from electrochemical impedance spectroscopy (EIS) were similar to those deduced from the polarization measurements and are in reasonably good agreement with that reported previously in literature [34,35]
Summary
Amphiphilic metal nanoparticles have been exploited for applications in antibacterial materials, medicine and catalysis due to their unique optical electronic and chemical properties [1,2,3]. Highly monodisperse hydrophilic and hydrophobic silver nanoparticles have been prepared in both aqueous and in organic solutions [4,5,6]. It is very important to develop a method that can be used to change the surface property of nanoparticles, from hydrophobic to hydrophilic, to increase the adsorption of nanoparticles at different interfaces and to control the transfer of nanoparticles from organic phases into aqueous phases [8,9]. Because the performance of amphiphilic nanoparticles is very sensitive to the shape and to the size distribution of nanoparticles [10,11,12], it is crucial to prepare silver nanoparticles of controllable monodisperse sizes as stable colloidal dispersions in water and organic solvents
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