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

Abstract

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 nanoparticlemore » stability.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Earth Sciences Division
OSTI Identifier:
1003824
Report Number(s):
LBNL-4124E
Journal ID: ISSN 0022-3654; JPCHAX; TRN: US201103%%111
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry
Additional Journal Information:
Journal Volume: 22; Journal Issue: 18; Related Information: Journal Publication Date: 2010; Journal ID: ISSN 0022-3654
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; CADMIUM SELENIDES; CHAINS; COATINGS; COMMERCIALIZATION; DESIGN; DISSOCIATION; FORECASTING; INSTABILITY; SHAPE; SODIUM CHLORIDES; STABILITY; SURFACE AREA; SURFACE COATING

Citation Formats

Mulvihill, M J, Habas, S E, La Plante, I J, Wan, J, and Mokari, T. The influence of size, shape, and surface coating on the stability of aqueous nanoparticle suspensions. United States: N. p., 2010. Web. doi:10.1021/cm101262s.
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. United States. https://doi.org/10.1021/cm101262s
Mulvihill, M J, Habas, S E, La Plante, I J, Wan, J, and Mokari, T. 2010. "The influence of size, shape, and surface coating on the stability of aqueous nanoparticle suspensions". United States. https://doi.org/10.1021/cm101262s. https://www.osti.gov/servlets/purl/1003824.
@article{osti_1003824,
title = {The influence of size, shape, and surface coating on the stability of aqueous nanoparticle suspensions},
author = {Mulvihill, M J and Habas, S E and La Plante, I J and Wan, J and Mokari, T},
abstractNote = {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.},
doi = {10.1021/cm101262s},
url = {https://www.osti.gov/biblio/1003824}, journal = {Journal of Physical Chemistry},
issn = {0022-3654},
number = 18,
volume = 22,
place = {United States},
year = {Fri Sep 03 00:00:00 EDT 2010},
month = {Fri Sep 03 00:00:00 EDT 2010}
}