Morphology and Mechanical Properties of Fossil Diatom Frustules from Genera of Ellerbeckia and Melosira
Fossil frustules of Ellerbeckia and Melosira were studied using laboratory-based nano X-ray tomography (nano-XCT), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). Three-dimensional (3D) morphology characterization using nondestructive nano-XCT reveals the conti...
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| Veröffentlicht in: | Nanomaterials (Basel, Switzerland) Switzerland), 2021-06, Vol.11 (6), p.1615 |
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| creator | Li, Qiong Gluch, Jürgen Liao, Zhongquan Posseckardt, Juliane Clausner, André Łępicka, Magdalena Grądzka-Dahlke, Małgorzata Zschech, Ehrenfried |
| description | Fossil frustules of Ellerbeckia and Melosira were studied using laboratory-based nano X-ray tomography (nano-XCT), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). Three-dimensional (3D) morphology characterization using nondestructive nano-XCT reveals the continuous connection of fultoportulae, tube processes and protrusions. The study confirms that Ellerbeckia is different from Melosira. Both genera reveal heavily silicified frustules with valve faces linking together and forming cylindrical chains. For this cylindrical architecture of both genera, valve face thickness, mantle wall thickness and copulae thickness change with the cylindrical diameter. Furthermore, EDS reveals that these fossil frustules contain Si and O only, with no other elements in the percentage concentration range. Nanopores with a diameter of approximately 15 nm were detected inside the biosilica of both genera using TEM. In situ micromechanical experiments with uniaxial loading were carried out within the nano-XCT on these fossil frustules to determine the maximal loading force under compression and to describe the fracture behavior. The fracture force of both genera is correlated to the dimension of the fossil frustules. The results from in situ mechanical tests show that the crack initiation starts either at very thin features or at linking structures of the frustules. |
| doi_str_mv | 10.3390/nano11061615 |
| format | Article |
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Three-dimensional (3D) morphology characterization using nondestructive nano-XCT reveals the continuous connection of fultoportulae, tube processes and protrusions. The study confirms that Ellerbeckia is different from Melosira. Both genera reveal heavily silicified frustules with valve faces linking together and forming cylindrical chains. For this cylindrical architecture of both genera, valve face thickness, mantle wall thickness and copulae thickness change with the cylindrical diameter. Furthermore, EDS reveals that these fossil frustules contain Si and O only, with no other elements in the percentage concentration range. Nanopores with a diameter of approximately 15 nm were detected inside the biosilica of both genera using TEM. In situ micromechanical experiments with uniaxial loading were carried out within the nano-XCT on these fossil frustules to determine the maximal loading force under compression and to describe the fracture behavior. The fracture force of both genera is correlated to the dimension of the fossil frustules. The results from in situ mechanical tests show that the crack initiation starts either at very thin features or at linking structures of the frustules.</description><identifier>ISSN: 2079-4991</identifier><identifier>EISSN: 2079-4991</identifier><identifier>DOI: 10.3390/nano11061615</identifier><identifier>PMID: 34202999</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>3D visualization ; Composite materials ; Compression ; Crack initiation ; Diameters ; diatom ; Ellerbeckia ; Experiments ; Field tests ; fossil frustule ; Fossils ; Mechanical properties ; Mechanical tests ; Melosira ; micromechanical behavior ; Morphology ; Scanning electron microscopy ; Silicon ; Tomography ; Transmission electron microscopy ; Wall thickness ; X-ray computed tomography ; X-ray spectroscopy</subject><ispartof>Nanomaterials (Basel, Switzerland), 2021-06, Vol.11 (6), p.1615</ispartof><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>2021 by the authors. 2021</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c412t-1b7386aabbdd7c2071c1a217dbbd1ba00319c0e24a88fa4eccb5bc85d435ed5a3</cites><orcidid>0000-0001-7868-4594 ; 0000-0002-1295-4333 ; 0000-0003-4612-1441 ; 0000-0001-5566-3002</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8235678/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8235678/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,315,728,781,785,865,886,2103,27926,27927,53793,53795</link.rule.ids></links><search><creatorcontrib>Li, Qiong</creatorcontrib><creatorcontrib>Gluch, Jürgen</creatorcontrib><creatorcontrib>Liao, Zhongquan</creatorcontrib><creatorcontrib>Posseckardt, Juliane</creatorcontrib><creatorcontrib>Clausner, André</creatorcontrib><creatorcontrib>Łępicka, Magdalena</creatorcontrib><creatorcontrib>Grądzka-Dahlke, Małgorzata</creatorcontrib><creatorcontrib>Zschech, Ehrenfried</creatorcontrib><title>Morphology and Mechanical Properties of Fossil Diatom Frustules from Genera of Ellerbeckia and Melosira</title><title>Nanomaterials (Basel, Switzerland)</title><description>Fossil frustules of Ellerbeckia and Melosira were studied using laboratory-based nano X-ray tomography (nano-XCT), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). Three-dimensional (3D) morphology characterization using nondestructive nano-XCT reveals the continuous connection of fultoportulae, tube processes and protrusions. The study confirms that Ellerbeckia is different from Melosira. Both genera reveal heavily silicified frustules with valve faces linking together and forming cylindrical chains. For this cylindrical architecture of both genera, valve face thickness, mantle wall thickness and copulae thickness change with the cylindrical diameter. Furthermore, EDS reveals that these fossil frustules contain Si and O only, with no other elements in the percentage concentration range. Nanopores with a diameter of approximately 15 nm were detected inside the biosilica of both genera using TEM. In situ micromechanical experiments with uniaxial loading were carried out within the nano-XCT on these fossil frustules to determine the maximal loading force under compression and to describe the fracture behavior. The fracture force of both genera is correlated to the dimension of the fossil frustules. The results from in situ mechanical tests show that the crack initiation starts either at very thin features or at linking structures of the frustules.</description><subject>3D visualization</subject><subject>Composite materials</subject><subject>Compression</subject><subject>Crack initiation</subject><subject>Diameters</subject><subject>diatom</subject><subject>Ellerbeckia</subject><subject>Experiments</subject><subject>Field tests</subject><subject>fossil frustule</subject><subject>Fossils</subject><subject>Mechanical properties</subject><subject>Mechanical tests</subject><subject>Melosira</subject><subject>micromechanical behavior</subject><subject>Morphology</subject><subject>Scanning electron microscopy</subject><subject>Silicon</subject><subject>Tomography</subject><subject>Transmission electron microscopy</subject><subject>Wall thickness</subject><subject>X-ray computed tomography</subject><subject>X-ray 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Magdalena</au><au>Grądzka-Dahlke, Małgorzata</au><au>Zschech, Ehrenfried</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Morphology and Mechanical Properties of Fossil Diatom Frustules from Genera of Ellerbeckia and Melosira</atitle><jtitle>Nanomaterials (Basel, Switzerland)</jtitle><date>2021-06-20</date><risdate>2021</risdate><volume>11</volume><issue>6</issue><spage>1615</spage><pages>1615-</pages><issn>2079-4991</issn><eissn>2079-4991</eissn><abstract>Fossil frustules of Ellerbeckia and Melosira were studied using laboratory-based nano X-ray tomography (nano-XCT), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). Three-dimensional (3D) morphology characterization using nondestructive nano-XCT reveals the continuous connection of fultoportulae, tube processes and protrusions. The study confirms that Ellerbeckia is different from Melosira. Both genera reveal heavily silicified frustules with valve faces linking together and forming cylindrical chains. For this cylindrical architecture of both genera, valve face thickness, mantle wall thickness and copulae thickness change with the cylindrical diameter. Furthermore, EDS reveals that these fossil frustules contain Si and O only, with no other elements in the percentage concentration range. Nanopores with a diameter of approximately 15 nm were detected inside the biosilica of both genera using TEM. In situ micromechanical experiments with uniaxial loading were carried out within the nano-XCT on these fossil frustules to determine the maximal loading force under compression and to describe the fracture behavior. The fracture force of both genera is correlated to the dimension of the fossil frustules. The results from in situ mechanical tests show that the crack initiation starts either at very thin features or at linking structures of the frustules.</abstract><cop>Basel</cop><pub>MDPI AG</pub><pmid>34202999</pmid><doi>10.3390/nano11061615</doi><orcidid>https://orcid.org/0000-0001-7868-4594</orcidid><orcidid>https://orcid.org/0000-0002-1295-4333</orcidid><orcidid>https://orcid.org/0000-0003-4612-1441</orcidid><orcidid>https://orcid.org/0000-0001-5566-3002</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | 3D visualization Composite materials Compression Crack initiation Diameters diatom Ellerbeckia Experiments Field tests fossil frustule Fossils Mechanical properties Mechanical tests Melosira micromechanical behavior Morphology Scanning electron microscopy Silicon Tomography Transmission electron microscopy Wall thickness X-ray computed tomography X-ray spectroscopy |
| title | Morphology and Mechanical Properties of Fossil Diatom Frustules from Genera of Ellerbeckia and Melosira |
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