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Influence of solvent polarity on the self-assembly and corrosion resistance of 8-hydroxyquinoline@MgO hybrid coatings.

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Title: Influence of solvent polarity on the self-assembly and corrosion resistance of 8-hydroxyquinoline@MgO hybrid coatings.
Authors: Sheng, Yujun1 (AUTHOR), Hazmatulhaq, Farah2 (AUTHOR), Assfour, Bassem3 (AUTHOR), Allaf, Abdul Wahab3,4 (AUTHOR), Al Hamoud, Lubna5 (AUTHOR), Al Zoubi, Wail1,2 (AUTHOR) wailalzoubi@ynu.ac.kr
Source: Materials Chemistry & Physics. Mar2026, Vol. 351, pN.PAG-N.PAG. 1p.
Subjects: Polar solvents, Corrosion resistance, Morphology, Electrochemical analysis, Hydrogen bonding, Hydroxyquinoline, Surface coatings, Molecular self-assembly
Abstract: In this study, we investigated the ordered self-assembly of N-heterocyclic donors (8-hydroxyquinoline (8-HQ)) on porous material surfaces (MgO-MgAl 2 O 4) to fabricate flower-like structures. Further, we examined the effect of the solvent (ethanol, methanol, and water) on the self-ordered assembly of these molecules. The 8-HQ molecules exhibited different morphology as they grew on the porous inorganic surface, which were attributed to the distinct polarity that influences the coordination between 8-HQ and metal ions dissolved from the inorganic layer using the solvent. The electrochemical performance was improved significantly with the addition of an organic layer on the porous inorganic surface, as confirmed through an electrochemical analysis. And Ethanol exhibited the best promotion with respect to the formation of a compact and well-organized assemblies flower structure, facilitated by the strongest inter-molecular hydrogen bonding and л-л interactions. The results showed that the ethanol-derived hybrid coating showed the lowest corrosion rate with a value of 2.174 × 10−4 mpy, and highest R value of 4.96 × 105 Ω cm2, demonstrating superior anti-corrosion performance over Mg substrate under aggressive environment. These results highlight solvent polarity as a powerful strategy for directing supra-molecular assembly and achieving substantial improvements in corrosion protection. • Fabrication flower-like structures in the solvent (ethanol, methanol, and water). • N-heterocyclic molecules exhibited different morphologies. • Variations in the polar solvent influenced the growth and stability of the self-organization. • This enhanced stability was attributed to inter and intra-molecular hydrogen bonds. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In this study, we investigated the ordered self-assembly of N-heterocyclic donors (8-hydroxyquinoline (8-HQ)) on porous material surfaces (MgO-MgAl 2 O 4) to fabricate flower-like structures. Further, we examined the effect of the solvent (ethanol, methanol, and water) on the self-ordered assembly of these molecules. The 8-HQ molecules exhibited different morphology as they grew on the porous inorganic surface, which were attributed to the distinct polarity that influences the coordination between 8-HQ and metal ions dissolved from the inorganic layer using the solvent. The electrochemical performance was improved significantly with the addition of an organic layer on the porous inorganic surface, as confirmed through an electrochemical analysis. And Ethanol exhibited the best promotion with respect to the formation of a compact and well-organized assemblies flower structure, facilitated by the strongest inter-molecular hydrogen bonding and л-л interactions. The results showed that the ethanol-derived hybrid coating showed the lowest corrosion rate with a value of 2.174 × 10−4 mpy, and highest R value of 4.96 × 105 Ω cm2, demonstrating superior anti-corrosion performance over Mg substrate under aggressive environment. These results highlight solvent polarity as a powerful strategy for directing supra-molecular assembly and achieving substantial improvements in corrosion protection. • Fabrication flower-like structures in the solvent (ethanol, methanol, and water). • N-heterocyclic molecules exhibited different morphologies. • Variations in the polar solvent influenced the growth and stability of the self-organization. • This enhanced stability was attributed to inter and intra-molecular hydrogen bonds. [ABSTRACT FROM AUTHOR]
ISSN:02540584
DOI:10.1016/j.matchemphys.2025.131971