Synthesis of nonionic amphiphilic chitosan nanoparticles for active corrosion protection of steel

Here we report new successful work for synthesis of amphiphilic chitosan (CS) nanogels in water using surfactant free method. In this respect, CS was amidated with unsaturated fatty acids such as oleic and linolenic acids to prepare hydrophobic CS. The CS fatty amides were grafted with polyoxyethylene aldehyde monomethyl ether prepared via Schiff base condensation to prepare CSLA-MPEG and CSOA-MPEG amphiphilic CS surfactants. The produced surfactants were converted to nanoparticles using methylene chloride as emulsifying solvent followed by crosslinking with sodium tripolyphosphate. The chemical structure of the prepared CS amphiphilic surfactants were characterized by FTIR and 1HNMR analyses. The particle size distribution of the prepared nanoparticles was characterized by DLS measurements. The surface activities and contact angle measurements of the amphiphilic CS nanoparticles solutions were measured using drop shape analyzer (DSA). The corrosion inhibition measurements of CSLA-MPEG and CSOA-MPEG nanoparticles on steel in 1 M hydrochloric acid solution were investigated using electrochemical polarization and impedance spectroscopy (EIS) methods.