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High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances

Isabella Römer, Zhi Wei Wang, Ruth C. Merrifield, Richard Palmer Orcid Logo, Jamie Lead

Environmental Science & Technology, Volume: 50, Issue: 5, Pages: 2183 - 2190

Swansea University Author: Richard Palmer Orcid Logo

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DOI (Published version): 10.1021/acs.est.5b04088

Abstract

Nanoparticles (NPs) are defined as particles with at least one dimension between 1 and 100 nm or with properties that differ from their bulk material, which possess unique properties. The extensive use of NPs means that discharge to the environment is likely increasing, but fate, behavior, and effec...

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Published in: Environmental Science & Technology
ISSN: 0013-936X 1520-5851
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa49231
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last_indexed 2019-05-14T13:56:52Z
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spelling 2019-05-13T12:58:18.2899521 v2 49231 2019-03-18 High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances 6ae369618efc7424d9774377536ea519 0000-0001-8728-8083 Richard Palmer Richard Palmer true false 2019-03-18 ACEM Nanoparticles (NPs) are defined as particles with at least one dimension between 1 and 100 nm or with properties that differ from their bulk material, which possess unique properties. The extensive use of NPs means that discharge to the environment is likely increasing, but fate, behavior, and effects under environmentally relevant conditions are insufficiently studied. This paper focuses on the transformations of silver nanoparticles (AgNPs) under simulated but realistic environmental conditions. High resolution aberration-corrected scanning transmission electron microscopy (HAADF STEM) coupled with electron energy loss spectroscopy (EELS) and UV–vis were used within a multimethod approach to study morphology, surface chemistry transformations, and corona formation. Although loss, most likely by dissolution, was observed, there was no direct evidence of oxidation from the STEM-EELS. However, in the presence of fulvic acid (FA), a 1.3 nm oxygen-containing corona was observed around the AgNPs in water; modeled data based on the HAADF signal at near atomic resolution suggest this was an FA corona was formed and was not silver oxide, which was coherent (i.e., fully coated in FA), where observed. The corona further colloidally stabilized the NPs for periods of weeks to months, dependent on the solution conditions. Journal Article Environmental Science &amp; Technology 50 5 2183 2190 0013-936X 1520-5851 31 12 2016 2016-12-31 10.1021/acs.est.5b04088 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2019-05-13T12:58:18.2899521 2019-03-18T14:28:12.8490213 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering Isabella Römer 1 Zhi Wei Wang 2 Ruth C. Merrifield 3 Richard Palmer 0000-0001-8728-8083 4 Jamie Lead 5
title High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances
spellingShingle High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances
Richard Palmer
title_short High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances
title_full High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances
title_fullStr High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances
title_full_unstemmed High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances
title_sort High Resolution STEM-EELS Study of Silver Nanoparticles Exposed to Light and Humic Substances
author_id_str_mv 6ae369618efc7424d9774377536ea519
author_id_fullname_str_mv 6ae369618efc7424d9774377536ea519_***_Richard Palmer
author Richard Palmer
author2 Isabella Römer
Zhi Wei Wang
Ruth C. Merrifield
Richard Palmer
Jamie Lead
format Journal article
container_title Environmental Science &amp; Technology
container_volume 50
container_issue 5
container_start_page 2183
publishDate 2016
institution Swansea University
issn 0013-936X
1520-5851
doi_str_mv 10.1021/acs.est.5b04088
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
document_store_str 0
active_str 0
description Nanoparticles (NPs) are defined as particles with at least one dimension between 1 and 100 nm or with properties that differ from their bulk material, which possess unique properties. The extensive use of NPs means that discharge to the environment is likely increasing, but fate, behavior, and effects under environmentally relevant conditions are insufficiently studied. This paper focuses on the transformations of silver nanoparticles (AgNPs) under simulated but realistic environmental conditions. High resolution aberration-corrected scanning transmission electron microscopy (HAADF STEM) coupled with electron energy loss spectroscopy (EELS) and UV–vis were used within a multimethod approach to study morphology, surface chemistry transformations, and corona formation. Although loss, most likely by dissolution, was observed, there was no direct evidence of oxidation from the STEM-EELS. However, in the presence of fulvic acid (FA), a 1.3 nm oxygen-containing corona was observed around the AgNPs in water; modeled data based on the HAADF signal at near atomic resolution suggest this was an FA corona was formed and was not silver oxide, which was coherent (i.e., fully coated in FA), where observed. The corona further colloidally stabilized the NPs for periods of weeks to months, dependent on the solution conditions.
published_date 2016-12-31T19:51:03Z
_version_ 1821436347963932672
score 11.047609

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