PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy
<p dir="ltr">In this study, we used broadband dielectric spectroscopy to analyze polymer nanofibers of poly(vinyl alcohol)/chitosan/silver nanoparticles. We also studied the effect of incorporating silver nanoparticles in the polymeric mat, on the chain motion dynamics and their inte...
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2018
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| _version_ | 1864513525875998720 |
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| author | Mohammad Hassan (8313699) |
| author2 | Ahmed Abukmail (18093838) Alaa Hassiba (18093841) Kenneth Mauritz (2004970) Ahmed Elzatahry (1515655) |
| author2_role | author author author author |
| author_facet | Mohammad Hassan (8313699) Ahmed Abukmail (18093838) Alaa Hassiba (18093841) Kenneth Mauritz (2004970) Ahmed Elzatahry (1515655) |
| author_role | author |
| dc.creator.none.fl_str_mv | Mohammad Hassan (8313699) Ahmed Abukmail (18093838) Alaa Hassiba (18093841) Kenneth Mauritz (2004970) Ahmed Elzatahry (1515655) |
| dc.date.none.fl_str_mv | 2018-11-01T00:00:00Z |
| dc.identifier.none.fl_str_mv | 10.3390/nano8110888 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/PVA_Chitosan_Silver_Nanoparticles_Electrospun_Nanocomposites_Molecular_Relaxations_Investigated_by_Modern_Broadband_Dielectric_Spectroscopy/25333717 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Engineering Chemical engineering Materials engineering electrospinning chitosan poly (vinyl alcohol) nanofibers silver nanoparticles |
| dc.title.none.fl_str_mv | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <p dir="ltr">In this study, we used broadband dielectric spectroscopy to analyze polymer nanofibers of poly(vinyl alcohol)/chitosan/silver nanoparticles. We also studied the effect of incorporating silver nanoparticles in the polymeric mat, on the chain motion dynamics and their interactions with chitosan nanofibers, and we calculated the activation energies of the sub-Tg relaxation processes. Results revealed the existence of two sub-Tg relaxations, the first gets activated at very low temperature (−90 °C) and accounts for motions of the side groups within the repeating unit such as –NH<sub>2</sub>, –OH, and –CH<sub>2</sub>OH in chitosan and poly(vinyl alcohol). The second process gets activated around −10 °C and it is thought to be related to the local main chain segments’ motions that are facilitated by fluctuations within the glycosidic bonds of chitosan. The activation energy for the chitosan/PVA/AgNPs nanocomposite nanofibers is much higher than that of the chitosan control film due to the presence of strong interactions between the amine groups and the silver nanoparticles. Kramers–Krönig integral transformation of the ε′′ vs. f spectra in the region of the chitosan Tg helped resolve this relaxation and displayed the progress of its maxima with increasing temperature in the regular manner.</p><p><br></p><h2>Other Information</h2><p dir="ltr">Published in: Nanomaterials<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/nano8110888" target="_blank">https://dx.doi.org/10.3390/nano8110888</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_7897fea438f6d43cb8169e59ed25c810 |
| identifier_str_mv | 10.3390/nano8110888 |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/25333717 |
| publishDate | 2018 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric SpectroscopyMohammad Hassan (8313699)Ahmed Abukmail (18093838)Alaa Hassiba (18093841)Kenneth Mauritz (2004970)Ahmed Elzatahry (1515655)EngineeringChemical engineeringMaterials engineeringelectrospinningchitosanpoly (vinyl alcohol)nanofiberssilver nanoparticles<p dir="ltr">In this study, we used broadband dielectric spectroscopy to analyze polymer nanofibers of poly(vinyl alcohol)/chitosan/silver nanoparticles. We also studied the effect of incorporating silver nanoparticles in the polymeric mat, on the chain motion dynamics and their interactions with chitosan nanofibers, and we calculated the activation energies of the sub-Tg relaxation processes. Results revealed the existence of two sub-Tg relaxations, the first gets activated at very low temperature (−90 °C) and accounts for motions of the side groups within the repeating unit such as –NH<sub>2</sub>, –OH, and –CH<sub>2</sub>OH in chitosan and poly(vinyl alcohol). The second process gets activated around −10 °C and it is thought to be related to the local main chain segments’ motions that are facilitated by fluctuations within the glycosidic bonds of chitosan. The activation energy for the chitosan/PVA/AgNPs nanocomposite nanofibers is much higher than that of the chitosan control film due to the presence of strong interactions between the amine groups and the silver nanoparticles. Kramers–Krönig integral transformation of the ε′′ vs. f spectra in the region of the chitosan Tg helped resolve this relaxation and displayed the progress of its maxima with increasing temperature in the regular manner.</p><p><br></p><h2>Other Information</h2><p dir="ltr">Published in: Nanomaterials<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/nano8110888" target="_blank">https://dx.doi.org/10.3390/nano8110888</a></p>2018-11-01T00:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.3390/nano8110888https://figshare.com/articles/journal_contribution/PVA_Chitosan_Silver_Nanoparticles_Electrospun_Nanocomposites_Molecular_Relaxations_Investigated_by_Modern_Broadband_Dielectric_Spectroscopy/25333717CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/253337172018-11-01T00:00:00Z |
| spellingShingle | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy Mohammad Hassan (8313699) Engineering Chemical engineering Materials engineering electrospinning chitosan poly (vinyl alcohol) nanofibers silver nanoparticles |
| status_str | publishedVersion |
| title | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy |
| title_full | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy |
| title_fullStr | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy |
| title_full_unstemmed | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy |
| title_short | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy |
| title_sort | PVA/Chitosan/Silver Nanoparticles Electrospun Nanocomposites: Molecular Relaxations Investigated by Modern Broadband Dielectric Spectroscopy |
| topic | Engineering Chemical engineering Materials engineering electrospinning chitosan poly (vinyl alcohol) nanofibers silver nanoparticles |