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Aggregation and dissolution of 4 nm ZnO nanoparticles in aqueous environments: influence of pH, ionic strength, size, and adsorption of humic acid.
Langmuir. 2011 May 17; 27(10):6059-68.L

Abstract

Metal oxide nanoparticles are used in a wide range of commercial products, leading to an increased interest in the behavior of these materials in the aquatic environment. The current study focuses on the stability of some of the smallest ZnO nanomaterials, 4 ± 1 nm in diameter nanoparticles, in aqueous solutions as a function of pH and ionic strength as well as upon the adsorption of humic acid. Measurements of nanoparticle aggregation due to attractive particle-particle interactions show that ionic strength, pH, and adsorption of humic acid affect the aggregation of ZnO nanoparticles in aqueous solutions, which are consistent with the trends expected from Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Measurements of nanoparticle dissolution at both low and high pH show that zinc ions can be released into the aqueous phase and that humic acid under certain, but not all, conditions can increase Zn(2+)(aq) concentrations. Comparison of the dissolution of ZnO nanoparticles of different nanoparticle diameters, including those near 15 and 240 nm, shows that the smallest nanoparticles dissolve more readily. Although qualitatively this enhancement in dissolution can be predicted by classical thermodynamics, quantitatively it does not describe the dissolution behavior very well.

Authors+Show Affiliations

Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21500814

Citation

Bian, Shao-Wei, et al. "Aggregation and Dissolution of 4 Nm ZnO Nanoparticles in Aqueous Environments: Influence of pH, Ionic Strength, Size, and Adsorption of Humic Acid." Langmuir : the ACS Journal of Surfaces and Colloids, vol. 27, no. 10, 2011, pp. 6059-68.
Bian SW, Mudunkotuwa IA, Rupasinghe T, et al. Aggregation and dissolution of 4 nm ZnO nanoparticles in aqueous environments: influence of pH, ionic strength, size, and adsorption of humic acid. Langmuir. 2011;27(10):6059-68.
Bian, S. W., Mudunkotuwa, I. A., Rupasinghe, T., & Grassian, V. H. (2011). Aggregation and dissolution of 4 nm ZnO nanoparticles in aqueous environments: influence of pH, ionic strength, size, and adsorption of humic acid. Langmuir : the ACS Journal of Surfaces and Colloids, 27(10), 6059-68. https://doi.org/10.1021/la200570n
Bian SW, et al. Aggregation and Dissolution of 4 Nm ZnO Nanoparticles in Aqueous Environments: Influence of pH, Ionic Strength, Size, and Adsorption of Humic Acid. Langmuir. 2011 May 17;27(10):6059-68. PubMed PMID: 21500814.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Aggregation and dissolution of 4 nm ZnO nanoparticles in aqueous environments: influence of pH, ionic strength, size, and adsorption of humic acid. AU - Bian,Shao-Wei, AU - Mudunkotuwa,Imali A, AU - Rupasinghe,Thilini, AU - Grassian,Vicki H, Y1 - 2011/04/18/ PY - 2011/4/20/entrez PY - 2011/4/20/pubmed PY - 2011/4/20/medline SP - 6059 EP - 68 JF - Langmuir : the ACS journal of surfaces and colloids JO - Langmuir VL - 27 IS - 10 N2 - Metal oxide nanoparticles are used in a wide range of commercial products, leading to an increased interest in the behavior of these materials in the aquatic environment. The current study focuses on the stability of some of the smallest ZnO nanomaterials, 4 ± 1 nm in diameter nanoparticles, in aqueous solutions as a function of pH and ionic strength as well as upon the adsorption of humic acid. Measurements of nanoparticle aggregation due to attractive particle-particle interactions show that ionic strength, pH, and adsorption of humic acid affect the aggregation of ZnO nanoparticles in aqueous solutions, which are consistent with the trends expected from Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Measurements of nanoparticle dissolution at both low and high pH show that zinc ions can be released into the aqueous phase and that humic acid under certain, but not all, conditions can increase Zn(2+)(aq) concentrations. Comparison of the dissolution of ZnO nanoparticles of different nanoparticle diameters, including those near 15 and 240 nm, shows that the smallest nanoparticles dissolve more readily. Although qualitatively this enhancement in dissolution can be predicted by classical thermodynamics, quantitatively it does not describe the dissolution behavior very well. SN - 1520-5827 UR - https://www.unboundmedicine.com/medline/citation/21500814/Aggregation_and_dissolution_of_4_nm_ZnO_nanoparticles_in_aqueous_environments:_influence_of_pH_ionic_strength_size_and_adsorption_of_humic_acid_ L2 - https://dx.doi.org/10.1021/la200570n DB - PRIME DP - Unbound Medicine ER -
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