Microstructure and nanomechanical properties of single stalks from diatom Didymosphenia geminata and their change due to absorption of selected ions
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet Warszawski)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF PHYCOLOGY (35pkt w roku publikacji)
ISSN
0022-3646
EISSN
1529-8817
Wydawca
WILEY-BLACKWELL
DOI
URL
Rok publikacji
2017
Numer zeszytu
4
Strony od-do
880-888
Numer tomu
53
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
diatoms
microstructure characterization
nanomechanical characterization
Streszczenia
Język
en
Treść
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 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.
Cechy publikacji
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:854874
CrossrefMetadata from Crossref logo
Cytowania
Liczba prac cytujących tę pracę
Brak danych
Referencje
Liczba prac cytowanych przez tę pracę
Brak danych