Agglomeration equilibria of hematite nanoparticles
Nanoparticle agglomeration is a naturally occurring physicochemical process which is utilized for environmental remediation. Investigations of agglomeration equilibria have hitherto been challenging because of the lack of an appropriate in-situ analytical method. We investigate dynamic equilibria be...
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| 格式: | Journal article |
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Elsevier
2016
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| _version_ | 1826280056074272768 |
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| author | Shimizu, K Sokolov, S Compton, R |
| author_facet | Shimizu, K Sokolov, S Compton, R |
| author_sort | Shimizu, K |
| collection | OXFORD |
| description | Nanoparticle agglomeration is a naturally occurring physicochemical process which is utilized for environmental remediation. Investigations of agglomeration equilibria have hitherto been challenging because of the lack of an appropriate in-situ analytical method. We investigate dynamic equilibria between individual and agglomerated hematite nanoparticles in 20 mM KCl solution at pH between 2.0 and 4.0 using the newly established particle-impact chronoamperometry. The results reveal that the electrochemical technique primarily detects individual Fe2O3 nanoparticles dissociated from the agglomerates indicative of the rapid and reversible nature of the agglomeration/dis-agglomeration process. A shift of the agglomeration equilibria towards cluster formation as pH increases from 2.0 to 4.0 is made apparent by the changes in the relative number and the size distribution of the monomeric nanoparticles detected. The work demonstrated herein opens a new way of investigating the agglomeration behavior of mineral nanoparticles in aquatic media. |
| first_indexed | 2024-03-07T00:07:59Z |
| format | Journal article |
| id | oxford-uuid:7835562f-a34b-43a1-bb0d-74c9e43ee685 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T00:07:59Z |
| publishDate | 2016 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:7835562f-a34b-43a1-bb0d-74c9e43ee6852022-03-26T20:29:12ZAgglomeration equilibria of hematite nanoparticlesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7835562f-a34b-43a1-bb0d-74c9e43ee685Symplectic Elements at OxfordElsevier2016Shimizu, KSokolov, SCompton, RNanoparticle agglomeration is a naturally occurring physicochemical process which is utilized for environmental remediation. Investigations of agglomeration equilibria have hitherto been challenging because of the lack of an appropriate in-situ analytical method. We investigate dynamic equilibria between individual and agglomerated hematite nanoparticles in 20 mM KCl solution at pH between 2.0 and 4.0 using the newly established particle-impact chronoamperometry. The results reveal that the electrochemical technique primarily detects individual Fe2O3 nanoparticles dissociated from the agglomerates indicative of the rapid and reversible nature of the agglomeration/dis-agglomeration process. A shift of the agglomeration equilibria towards cluster formation as pH increases from 2.0 to 4.0 is made apparent by the changes in the relative number and the size distribution of the monomeric nanoparticles detected. The work demonstrated herein opens a new way of investigating the agglomeration behavior of mineral nanoparticles in aquatic media. |
| spellingShingle | Shimizu, K Sokolov, S Compton, R Agglomeration equilibria of hematite nanoparticles |
| title | Agglomeration equilibria of hematite nanoparticles |
| title_full | Agglomeration equilibria of hematite nanoparticles |
| title_fullStr | Agglomeration equilibria of hematite nanoparticles |
| title_full_unstemmed | Agglomeration equilibria of hematite nanoparticles |
| title_short | Agglomeration equilibria of hematite nanoparticles |
| title_sort | agglomeration equilibria of hematite nanoparticles |
| work_keys_str_mv | AT shimizuk agglomerationequilibriaofhematitenanoparticles AT sokolovs agglomerationequilibriaofhematitenanoparticles AT comptonr agglomerationequilibriaofhematitenanoparticles |