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Reversible and pH-modulated changes in microgel size triggered by electrochemical stimuli

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cris.lastimport.scopus2024-02-12T19:03:52Z
dc.abstract.enA novel microgel, the volume of which can be reversibly changed by using an electrochemical trigger, was successfully synthesized. To this end, a monomer based on N-(3-aminopropyl)methacrylamide modified with ferrocenecarboxylic acid was obtained and co-polymerized with acrylic acid and N,N′–methylenebisacrylamide. Using the distillation precipitation polymerization method, spherical, smooth-surfaced microgel particles ca. 500 nm in diameter were obtained. The presence of ferrocene groups in the microgel was shown with nuclear magnetic resonance spectroscopy, energy dispersive X-ray spectroscopy, and cyclic voltammetry methods. Dynamic light scattering experiments showed that the microgel size strongly depends on the oxidation state of the ferrocene groups. Next, cyclic voltammetry and chronoamperometry combined with quartz crystal microbalance measurements, obtained with an Au electrochemical quartz crystal microbalance electrode modified with the microgel, proved that the microgel size could be controlled by an electrochemical trigger. More interestingly, the electro-response was found to strongly depend on pH. In acidic pH, where almost all carboxylic groups are protonated, the oxidation of ferrocene groups led to a decrease in the registered frequency shift, related to the microgel swelling process. In alkaline pH, where many carboxylic groups are ionized, the oxidation of ferrocene led to an increase in frequency, related to the microgel shrinking process. These processes were found to be reversible and relatively fast.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKarbarz, Marcin
dc.contributor.authorRomański, Jan
dc.contributor.authorMaćkiewicz, Marcin
dc.contributor.authorJagleniec, Damian
dc.contributor.authorMarcisz, Kamil
dc.date.accessioned2024-01-25T19:25:55Z
dc.date.available2024-01-25T19:25:55Z
dc.date.issued2022
dc.description.financeNie dotyczy
dc.description.volume26
dc.identifier.doi10.1016/J.MTCHEM.2022.101151
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/118548
dc.identifier.weblinkhttps://api.elsevier.com/content/article/PII:S2468519422003809?httpAccept=text/xml
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofMaterials Today Chemistry
dc.relation.pages101151
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enElectrosensitivity
dc.subject.enEnvironmentally-sensitive microgels
dc.subject.enQuartz microbalance
dc.subject.enVolume change transition
dc.titleReversible and pH-modulated changes in microgel size triggered by electrochemical stimuli
dc.typeJournalArticle
dspace.entity.typePublication