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Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures

The observation on the non-linear magnetism of pure and polymer-capped silver (Ag) nanostructure in the random arrangement has been a puzzle since long ago. In the present study, the synthesised pure Ag nanostructures and chitosan oligosaccharide (COS)–Ag nanostructures with structure precision (0-D...

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Main Authors: Nurul Akmal, Che Lah, Muhammad Nasrulamin, Mesran, Mohd Mawardi, Saari
Format: Article
Language:English
Published: Elsevier Ltd 2020
Subjects:
TS Manufactures
Online Access:http://umpir.ump.edu.my/id/eprint/28388/1/Frequency-dependent%20of%20AC%20susceptibility%20in%20chitosan%20oligosaccharide.pdf
http://umpir.ump.edu.my/id/eprint/28388/
https://doi.org/10.1016/j.jallcom.2020.155366
https://doi.org/10.1016/j.jallcom.2020.155366
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spelling my.ump.umpir.283882021-01-22T07:59:20Z http://umpir.ump.edu.my/id/eprint/28388/ Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures Nurul Akmal, Che Lah Muhammad Nasrulamin, Mesran Mohd Mawardi, Saari TS Manufactures The observation on the non-linear magnetism of pure and polymer-capped silver (Ag) nanostructure in the random arrangement has been a puzzle since long ago. In the present study, the synthesised pure Ag nanostructures and chitosan oligosaccharide (COS)–Ag nanostructures with structure precision (0-D and 1-D nanostructures) and whose size range is known are observed to find out their origin of non-linear susceptibility magnetism using the custom-made AC susceptometer at 27 °C (300 K). Two established relations are considered (magnetisation, M and magnetic permeability, μ) based on the assessed effective susceptibility, χ. It is found that the transition field from diamagnetic to paramagnetic at which the total χ1,eff does the zero crossing is at dm ∼120 nm for pure Ag nanostructures. Whereas, for COS–Ag nanostructures with similar dm showed the paramagnetic behaviour. The results demonstrated that the transition of diamagnetism to paramagnetism based on effective χ1,eff and χ2,eff of reduced sizes and aggregated nanostructures for both pure Ag and COS capped Ag nanostructures are caused by the increasing of spin pairing and resulted in an increase of Meff per atom as the particles get smaller. Interestingly, the COS macromolecules have a small Meff themselves which helps in the transition of diamagnetic to paramagnetic Ag. The experiments can be the alternative way to monitor the paramagnetism of Ag nanostructures which could further provide insight for current development in designing the nanostructures with appropriate surface functional features that could be used as one of the promising SERS nanotags candidates in non-invasive imaging of cancer cells. Elsevier Ltd 2020-04-30 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/28388/1/Frequency-dependent%20of%20AC%20susceptibility%20in%20chitosan%20oligosaccharide.pdf Nurul Akmal, Che Lah and Muhammad Nasrulamin, Mesran and Mohd Mawardi, Saari (2020) Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures. Journal of Alloys and Compounds, 835 (155366). pp. 1-16. ISSN 0925-8388 (print), 1873-4669 (online) https://doi.org/10.1016/j.jallcom.2020.155366 https://doi.org/10.1016/j.jallcom.2020.155366
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic TS Manufactures
spellingShingle TS Manufactures
Nurul Akmal, Che Lah
Muhammad Nasrulamin, Mesran
Mohd Mawardi, Saari
Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures
description The observation on the non-linear magnetism of pure and polymer-capped silver (Ag) nanostructure in the random arrangement has been a puzzle since long ago. In the present study, the synthesised pure Ag nanostructures and chitosan oligosaccharide (COS)–Ag nanostructures with structure precision (0-D and 1-D nanostructures) and whose size range is known are observed to find out their origin of non-linear susceptibility magnetism using the custom-made AC susceptometer at 27 °C (300 K). Two established relations are considered (magnetisation, M and magnetic permeability, μ) based on the assessed effective susceptibility, χ. It is found that the transition field from diamagnetic to paramagnetic at which the total χ1,eff does the zero crossing is at dm ∼120 nm for pure Ag nanostructures. Whereas, for COS–Ag nanostructures with similar dm showed the paramagnetic behaviour. The results demonstrated that the transition of diamagnetism to paramagnetism based on effective χ1,eff and χ2,eff of reduced sizes and aggregated nanostructures for both pure Ag and COS capped Ag nanostructures are caused by the increasing of spin pairing and resulted in an increase of Meff per atom as the particles get smaller. Interestingly, the COS macromolecules have a small Meff themselves which helps in the transition of diamagnetic to paramagnetic Ag. The experiments can be the alternative way to monitor the paramagnetism of Ag nanostructures which could further provide insight for current development in designing the nanostructures with appropriate surface functional features that could be used as one of the promising SERS nanotags candidates in non-invasive imaging of cancer cells.
format Article
author Nurul Akmal, Che Lah
Muhammad Nasrulamin, Mesran
Mohd Mawardi, Saari
author_facet Nurul Akmal, Che Lah
Muhammad Nasrulamin, Mesran
Mohd Mawardi, Saari
author_sort Nurul Akmal, Che Lah
title Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures
title_short Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures
title_full Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures
title_fullStr Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures
title_full_unstemmed Frequency-dependent of AC susceptibility in chitosan oligosaccharide-Ag nanostructures
title_sort frequency-dependent of ac susceptibility in chitosan oligosaccharide-ag nanostructures
publisher Elsevier Ltd
publishDate 2020
url http://umpir.ump.edu.my/id/eprint/28388/1/Frequency-dependent%20of%20AC%20susceptibility%20in%20chitosan%20oligosaccharide.pdf
http://umpir.ump.edu.my/id/eprint/28388/
https://doi.org/10.1016/j.jallcom.2020.155366
https://doi.org/10.1016/j.jallcom.2020.155366
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score 13.211869

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