| Aggregation kinetics of colloidal particles measured by gas-phase differential mobility analysis. | |
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MedLine Citation:
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PMID: 19063636 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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We demonstrate the utility of electrospray gas-phase ion-mobility analysis as a new method to investigate nanoparticle flocculation, or aggregation. Au nanoparticle (Au-NP) solutions were sampled via electrospray (ES), followed by differential ion-mobility analysis (DMA) to determine the particle mobility distribution. Multimodal size distributions obtained with ES-DMA indicated the presence of single Au-NPs (monomer) as well as larger Au-NP clusters such as dimers, trimers, and tetramers under specific solution conditions. The fraction of each aggregate species as a function of time was quantitatively characterized, from which the degree of aggregation, aggregation rate, and stability ratio at different ionic strengths were determined. The latter enabled the extraction of a surface potential (or surface charge density) of 64 +/- 2 mV for 10 nm Au-NPs, which is in good agreement with values obtained from other methods, thus validating our approach. Our results show that ES-DMA is a valuable tool for quantitatively probing the early stages of colloidal aggregation or as a preparatory tool for the size election of aggregates. |
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Authors:
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D-H Tsai; L F Pease; R A Zangmeister; M J Tarlov; M R Zachariah |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Langmuir : the ACS journal of surfaces and colloids Volume: 25 ISSN: 0743-7463 ISO Abbreviation: Langmuir Publication Date: 2009 Jan |
Date Detail:
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Created Date: 2008-12-31 Completed Date: 2009-02-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882736 Medline TA: Langmuir Country: United States |
Other Details:
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Languages: eng Pagination: 140-6 Citation Subset: - |
Affiliation:
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Department of Chemistry and Biochemistry and Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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