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Microstructure and nanomechanical properties of single stalks from diatom Didymosphenia geminata and their change due to adsorption of selected metal ions

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dc.abstract.enWe present topographical and nanomechanical characterization of single Didymosphenia geminata stalk. We compared the samples before and after adsorption of metal ions from freshwater samples. Transmission electron microscopy studies of single stalk cross-sections have shown three distinct layers and an additional thin extra coat on the external layer (called "EL"). Using scanning electron microscopy and atomic force microscopy (AFM), we found that topography of single stalks after ionic adsorption differed significantly from topography of pristine stalks. AFM nanoindentation studies in ambient conditions yielded elastic moduli of 214 ± 170 MPa for pristine stalks and 294 ± 108 MPa for stalks after ionic adsorption. Statistical tests showed that those results were significantly different. We conducted only preliminary comparisons between ionic adsorption of several stalks in air and in water. While the stalks with ions were on average stiffer than the pristine stalks in air, they became more compliant than the pristine stalks in water. We also heated the stalks and detected EL softening at 50°C ± 15°C. AFM nanoindentation in air on the softened samples yielded elastic moduli of 26 ± 9 MPa for pristine samples and 43 ± 22 MPa for stalks with absorbed metal ions. Substantial decrease of the EL elastic moduli after heating was expected. Significantly different elastic moduli for the samples after ionic adsorption in both cases (i.e., for heated and nonheated samples), as well as behavior of the stalks immersed in water, point to permanent structural EL changes due to ions.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorSzoszkiewicz, Robert
dc.contributor.authorWoźniak, Michał
dc.contributor.authorŁojkowski, Maciej
dc.contributor.authorWYROBA, ELŻBIETA
dc.contributor.authorZgłobicka, Izabela
dc.contributor.authorŚwięszkowski, Wojciech
dc.contributor.authorKurzydłowski, Krzysztof
dc.contributor.authorCHLANDA, ADRIAN
dc.contributor.authorMazurkiewicz-Pawlicka, Marta
dc.date.accessioned2024-01-25T11:29:19Z
dc.date.available2024-01-25T11:29:19Z
dc.date.issued2017
dc.description.financeNie dotyczy
dc.description.number4
dc.description.volume53
dc.identifier.doi10.1111/JPY.12548
dc.identifier.issn0022-3646
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112447
dc.identifier.weblinkhttps://onlinelibrary.wiley.com/doi/epdf/10.1111/jpy.12548
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofJournal of Phycology
dc.relation.pages880-888
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.endiatoms
dc.subject.enmicrostructure characterization
dc.subject.ennanomechanical characterization
dc.titleMicrostructure and nanomechanical properties of single stalks from diatom Didymosphenia geminata and their change due to adsorption of selected metal ions
dc.typeJournalArticle
dspace.entity.typePublication