Role of N -methyl-2-pyrrolidone for preparation of Fe 3 O 4 @SiO 2 controlled the shell thickness

Abstract

We developed a simple and novel approach for the synthesis of Fe₃O₄@SiO₂ nanoparticles with controlled shell thickness, and studied the mechanism. The introduction of N-methyl-2-pyrrolidone (NMP) led to trapping of monomer nuclei in single shell and controlled the shell thickness. Fe₃O₄@SiO₂ controlled the shell thickness, showing a high magnetization value (64.47 emu/g). Our results reveal the role and change in the chemical structure of NMP during the core-shell synthesis process. NMP decomposed to 4-aminobutanoic acid in alkaline condition and decreased the hydrolysis rate of the silica coating process.

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