Dual functionality of ferrocene-based metallopolymers as radical scavengers and nanoparticle stabilizing agents

Nizar B. Alsharif, Tibor Gergo Halmágyi, Mark A. Hempenius, G. Julius Vancso, Corinne Nardin, Istvan Szilagyi*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
33 Downloads (Pure)

Abstract

The beneficial redox properties of ferrocene-based polymers have been utilized during in situ preparation of metallic nanoparticles, while such redox features also indicate a great promise in applications as free radical scavengers. Here, colloidal dispersions of an antioxidant nanozyme composed of amidine-functionalized polystyrene latex (AL) nanoparticles, negatively charged poly(ferrocenylsilane) (PFS(−)) organometallic polyions, and ascorbic acid (AA) were formulated. The AL was first functionalized with PFS(−). Increasing the polymer dose resulted in charge neutralization and subsequent charge reversal of the particles. The strength of repulsive interparticle forces of electrostatic nature was significant at low and high doses leading to stable colloids, while attractive forces dominated near the charge neutralization point giving rise to unstable dispersions. The saturated PFS(−) layer adsorbed on the surface of the AL (p-AL nanozyme) enhanced the colloidal stability against salt-induced aggregation without affecting the pH-dependent charge and size of the particles. The joint effect of PFS(−) and the AA in radical decomposition was observed indicating the antioxidant potential of the system. The immobilization of PFS(−) deteriorated its scavenging activity, yet the combination with AA improved this feature. The results indicate that p-AL-AA is a promising radical scavenger since the high colloidal stability of the particles allows application in heterogeneous systems, such as in industrial manufacturing processes, where antioxidants are required to maintain acceptable product quality.

Original languageEnglish
Pages (from-to)11875-11883
Number of pages9
JournalNanoscale
Volume15
Issue number28
Early online date12 Jun 2023
DOIs
Publication statusPublished - 28 Jul 2023

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