The influence of size, shape, and surface coating on the stability of aqueous nanoparticle suspensions

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In response to the rapid development and emerging commercialization of nanoparticles, fundamental studies concerning the fate of nanoparticles in the environment are needed. Precise control over the nanoparticle size, shape, and surface coating of cadmium selenide particles modified with thiolate ligands has been used to analyze the effects of nanoparticle design on their stability in aqueous environments. Nanoparticle stability was quantified using the concept of critical coagulation concentration (CCC) in solutions of sodium chloride. These investigations characterized the instability of the ligand coatings, which varied directly with chain length of the capping ligands. The stability of the ligand coatings were ... continued below

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Mulvihill, M.J.; Habas, S.E.; La Plante, I.J.; Wan, J. & Mokari, T. September 3, 2010.

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In response to the rapid development and emerging commercialization of nanoparticles, fundamental studies concerning the fate of nanoparticles in the environment are needed. Precise control over the nanoparticle size, shape, and surface coating of cadmium selenide particles modified with thiolate ligands has been used to analyze the effects of nanoparticle design on their stability in aqueous environments. Nanoparticle stability was quantified using the concept of critical coagulation concentration (CCC) in solutions of sodium chloride. These investigations characterized the instability of the ligand coatings, which varied directly with chain length of the capping ligands. The stability of the ligand coatings were characterized as a function of time, pH, and ionic strength. Ligand dissociation has been shown to be a primary mechanism for nanoparticle aggregation when short-chain (C2-C6) ligands are used in the ligand shell. Stable nanoparticle suspensions prepared with long chain ligands (C11) were used to characterize nanoparticle stability as a function of size and shape. A linear relationship between particle surface area and the CCC was discovered and was found to be independent of nanoparticle shape. Quantitative analysis of nanoparticle size, shape, and surface coating demonstrated the importance of ligand stability and particle surface area for the prediction of nanoparticle stability.

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  • Journal Name: Journal of Physical Chemistry; Journal Volume: 22; Journal Issue: 18; Related Information: Journal Publication Date: 2010

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  • Report No.: LBNL-4124E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1003824
  • Archival Resource Key: ark:/67531/metadc831073

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  • September 3, 2010

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  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 8:42 p.m.

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Mulvihill, M.J.; Habas, S.E.; La Plante, I.J.; Wan, J. & Mokari, T. The influence of size, shape, and surface coating on the stability of aqueous nanoparticle suspensions, article, September 3, 2010; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc831073/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.