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

Journal of Phycology
Izabela ZgłobickaKrzysztof J Kurzydłowski

Abstract

We 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...Continue Reading

References

Oct 18, 1973·Zeitschrift für Zellforschung und mikroskopische Anatomie·E Wyroba, A Przelecka
Jan 1, 1966·The Anatomical Record·A RambourgC P Leblond

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Citations

Jan 27, 2019·Beilstein Journal of Nanotechnology·Mateusz MrukiewiczMałgorzata Djas
Jan 16, 2019·Beilstein Journal of Nanotechnology·Przemyslaw OberbekTomasz Puzyn
Jan 14, 2019·ACS Biomaterials Science & Engineering·Alicja Kosik-KoziołCedryck Vaquette
Apr 5, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Maciej ŁojkowskiWojciech Święszkowski

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