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Development of a method for measuring the rigidity of nanofibers

  • Over the past decades, the growing industry working for lightweight constructions has demanded materials exhibiting improved properties such as higher mechanical modulus and strength, better chemical resistance and lower costs of production. It is known that especially nanofibers tend to enhance the mechanical, thermal and electrical properties of polymers. Therefore, some types of nanofibers are already being used embedded in polymeric matrix of sports equipment, aircraft parts and automobile components. However, nanofibers are a relatively new material category, the consequences of which for mankind are not yet fully known. Nanofibers detached from polymeric materials can be released into the environment during, e.g., processing and aging. The risks in dealing with such nanofibers are generally unknown, even if further studies of health aspects are being carried out. Problems always arise when the fibers can penetrate the cells, thus the mechanical rigidity of nanofibers is a keyOver the past decades, the growing industry working for lightweight constructions has demanded materials exhibiting improved properties such as higher mechanical modulus and strength, better chemical resistance and lower costs of production. It is known that especially nanofibers tend to enhance the mechanical, thermal and electrical properties of polymers. Therefore, some types of nanofibers are already being used embedded in polymeric matrix of sports equipment, aircraft parts and automobile components. However, nanofibers are a relatively new material category, the consequences of which for mankind are not yet fully known. Nanofibers detached from polymeric materials can be released into the environment during, e.g., processing and aging. The risks in dealing with such nanofibers are generally unknown, even if further studies of health aspects are being carried out. Problems always arise when the fibers can penetrate the cells, thus the mechanical rigidity of nanofibers is a key factor in assessing the risks. Common methods describe the geometry of nanofibers. These methods are necessary, but not sufficient to describe the mechanical properties, as for during manufacture and aging these properties may change; the modulus and strength values may differ from those of the original fibers. Different experimental techniques for nanomechanical testing have been studied using the atomic force microscope, the scanning electron microscope and transmission electron microscope, showing promising results. This project aims to evaluate the bending stiffness of CNTs with an experimental setup within the Dynamic Scanning Electron Microscope. Based on the Euller-Bernoulli beam theory, the Young’s modulus of CNTs can be obtained using the resonance frequency of mechanically excited nanofibers, its dimensions and density. The resonance frequency is acquired by extracting the signals of the secondary electrons when the nanofibers show significant vibration movement, also possible to be seen on the microscope images. The electronic signals of the secondary electrons are filtered and treated by a lock-in amplifier, so the corresponding amplitude and phase values can be evaluated. This method could be applied to any nanofiber that has the shape similar to a symmetric beam.zeige mehrzeige weniger

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  • Poster Workshop Reference Nanomaterials 2018.pdf
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Metadaten
Autor*innen:Renata Fortini Moustafa Osman
Koautor*innen:D. Kehren, A. Meyer-Plath, Heinz Sturm
Dokumenttyp:Posterpräsentation
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2018
Organisationseinheit der BAM:6 Materialchemie
6 Materialchemie / 6.6 Physik und chemische Analytik der Polymere
DDC-Klassifikation:Naturwissenschaften und Mathematik / Chemie / Analytische Chemie
Freie Schlagwörter:DySEM; Nanofiber; Resonance; Rigidity
Themenfelder/Aktivitätsfelder der BAM:Chemie und Prozesstechnik
Veranstaltung:Workshop on Reference Nanomaterials Current situation and needs: development, measurement, standarization
Veranstaltungsort:Berlin, Germany
Beginndatum der Veranstaltung:14.05.2018
Enddatum der Veranstaltung:15.04.2018
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:09.11.2018
Referierte Publikation:Nein
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