Application of L-citrulline loaded beta-cyclodextrin nano-carrier for fabrication of a corrosion protective silane film on mild-steel
In the present work, a beta-cyclodextrin (β-CD) container was utilized for encapsulating the L-citrulline (L-Cit) molecules to achieve promising active and/or passive protection properties in a silane coating. The inclusion complexes (β-CD-L-Cit) were characterized by Fourier-transform infrared spec...
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Veröffentlicht in: | Progress in organic coatings 2021-12, Vol.161, p.106484, Article 106484 |
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Zusammenfassung: | In the present work, a beta-cyclodextrin (β-CD) container was utilized for encapsulating the L-citrulline (L-Cit) molecules to achieve promising active and/or passive protection properties in a silane coating. The inclusion complexes (β-CD-L-Cit) were characterized by Fourier-transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), Raman, and Ultraviolet-visible spectroscopy (UV–Vis) techniques. The morphologies of the particles were visualized by field-emission scanning electron microscopy (FE-SEM). The TGA curves displayed about 6% L-Cit molecules encapsulation via β-CDs. The results obtained from the polarization and electrochemical impedance spectroscopy (EIS) tests results evidenced a mixed inhibition mechanism of the encapsulated inhibitor with an inhibition efficiency of 87% for the β-CD-L-Cit sample.
The active protection ability of the silane coating (SiC) was evidenced by the EIS results of the scratched coatings. The total resistance of the β-CD-L-Cit/SiC scratched composite was improved from 5540 Ω.cm2 (neat scratched SiC) to 33,128 Ω.cm2 (scratched SiC + 1 wt% inclusion complexes) corresponding to the coverage of the scratched parts via a barrier film. The FE-SEM micrographs demonstrated the development of a smooth and compact inhibitive layer on the scratched region. Additionally, the conducted EIS test over the intact sample illustrated that the highest anti-corrosion property belonged to the β-CD-L-Cit/SiC sample (88,774 Ω.cm2). The improvements are attributed to the SiC matrix pathways blockage by the β-CD-L-Cit inclusion complexes. Besides the experiments, various modeling and simulation explorations were conducted employing Density Functional Theory (DFT-D), Molecular Dynamics (MD), and Monte Carlo (MC)-based tools for elucidating fundamental understandings about L-Cit and β-CD-L-Cit interactions/adsorption at their interface with metallic adsorbent. These theoretical evaluations strongly reflected the affinity of pure and β-CD complexes of L-Cit onto the adsorbent.
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•A biocompatible container named Beta-cyclodextrin was utilized for encapsulating the L-citrulline molecules.•The β-CD-L-Cit retarded about 87% of the steel aggression via mixed inhibition.•Silane coating filled with β-CD-L-Cit revealed long-term/durable self-healing anti-corrosion effect.•The MD/MC simulations evidenced the adsorption of β-CD-L-Cit over the steel substrate. |
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ISSN: | 0300-9440 1873-331X |
DOI: | 10.1016/j.porgcoat.2021.106484 |