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© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

In this paper, a controlled-release system of caffeine as a corrosion inhibitor was obtained by encapsulating it in MCM-41 silica nanoparticles coated with a poly(β-amino ester) (PbAE), a pH-sensible polymer. Encapsulation was verified using Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TGA). The release of caffeine from the nanocontainers was analyzed in electrolytes with pH values of 4, 5, and 7 using UV–Vis, showing a 21% higher release in acidic electrolytes than in neutral electrolytes, corroborating its pH sensitivity. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization were used to determine the inhibition mode and efficiency of the encapsulated and free caffeine. The caffeine released from the nanocontainers showed the highest efficiency, which was 85.19%. These results indicate that these nanocontainers could have potential use in smart anticorrosion coating applications.

Details

Title
Synthesis and Electrochemical Evaluation of MSNs-PbAE Nanocontainers for the Controlled Release of Caffeine as a Corrosion Inhibitor
Author
Aguirre-Pulido, Martín 1 ; González-Sánchez, Jorge A 1   VIAFID ORCID Logo  ; Dzib-Pérez, Luis R 1 ; Soria-Castro, Montserrat 2 ; Ávila-Ortega, Alejandro 3   VIAFID ORCID Logo  ; Talavera-Pech, William A 1   VIAFID ORCID Logo 

 Corrosion Research Center, Autonomous University of Campeche, Avenida Héroe de Nacozari 480, Campeche 24079, Mexico 
 Department of Applied Physics, CINVESTAV-IPN Merida Unit, Km 6 Old Road to Progreso, Mérida 97310, Mexico 
 Faculty of Chemical Engineering, Autonomous University of Yucatán (UADY), Periférico Norte Km 33.5, 13615, Chuburna de Hidalgo Inn, Mérida 97203, Mexico 
First page
2670
Publication year
2022
Publication date
2022
Publisher
MDPI AG
e-ISSN
19994923
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2756780098
Copyright
© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.