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<p>Using Spinacia oleracea extract as a reducing and stabilizing medium, a novel nano-sized Ag(I) complex based on the Schiff base ligand 1-((E)-(2-mercaptophenylimino)methyl)naphthalen-2-ol (H₂L) was produced in an environmentally friendly manner. Several physicochemical and spectroscopic methods were used to describe the produced AgL nanocomplex, demonstrating a distorted trigonal–planar coordination geometry around the Ag(I) center. The molecular structure was optimized using density functional theory (DFT) simulations, which demonstrated strong agreement with experimental findings. Gravimetric and electrochemical methods were used to assess the AgL nanocomplex’s corrosion inhibition ability for nickel–aluminum bronze (NAB) alloy in a binary acidic solution (1&#xa0;M HCl + HNO₃). Potentiodynamic polarization measurements showed that the inhibition efficacy rose with inhibitor concentration (100–600 ppm), peaking at 78.7% at 600 ppm. Langmuir, Temkin, and Freundlich isotherms were followed by the adsorption behavior, suggesting a spontaneous adsorption mechanism. Statistical optimization using design of experiments (DOE) and ANOVA analysis revealed that inhibitor concentration was the most significant factor affecting weight loss, with a strong non-linear relationship. Surface morphology studies using SEM/EDX confirmed the formation of a protective adsorbed film on the NAB surface. In addition, the AgL nanocomplex exhibited promising antibacterial and antifungal activity against selected microorganisms.</p> Graphical Abstract <p></p>

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Green-Synthesized Nanocomplexes for NAB Alloy Protection: Characterization, Theoretical Modeling and Biological Evaluation with DOE/ANOVA Optimization

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Ghalia A. Gaber,
  • Shimaa Hosny

摘要

Using Spinacia oleracea extract as a reducing and stabilizing medium, a novel nano-sized Ag(I) complex based on the Schiff base ligand 1-((E)-(2-mercaptophenylimino)methyl)naphthalen-2-ol (H₂L) was produced in an environmentally friendly manner. Several physicochemical and spectroscopic methods were used to describe the produced AgL nanocomplex, demonstrating a distorted trigonal–planar coordination geometry around the Ag(I) center. The molecular structure was optimized using density functional theory (DFT) simulations, which demonstrated strong agreement with experimental findings. Gravimetric and electrochemical methods were used to assess the AgL nanocomplex’s corrosion inhibition ability for nickel–aluminum bronze (NAB) alloy in a binary acidic solution (1 M HCl + HNO₃). Potentiodynamic polarization measurements showed that the inhibition efficacy rose with inhibitor concentration (100–600 ppm), peaking at 78.7% at 600 ppm. Langmuir, Temkin, and Freundlich isotherms were followed by the adsorption behavior, suggesting a spontaneous adsorption mechanism. Statistical optimization using design of experiments (DOE) and ANOVA analysis revealed that inhibitor concentration was the most significant factor affecting weight loss, with a strong non-linear relationship. Surface morphology studies using SEM/EDX confirmed the formation of a protective adsorbed film on the NAB surface. In addition, the AgL nanocomplex exhibited promising antibacterial and antifungal activity against selected microorganisms.

Graphical Abstract