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DOI | 10.1016/j.scitotenv.2014.04.120 |
Preferential interaction of Na+ over K+ with carboxylate-functionalized silver nanoparticles | |
Pokhrel, Lok R.1,2; Andersen, Christian P.2; Rygiewicz, Paul T.2; Johnson, Mark G.2 | |
发表日期 | 2014-08-15 |
ISSN | 0048-9697 |
卷号 | 490页码:11-18 |
英文摘要 | Elucidating mechanistic interactions between monovalent cations (Na+/K+) and engineered nanoparticle surfaces to alter particle stability in polar media have received little attention. We investigated relative preferential interaction of Na+ and K+ with carboxylate-functionalized silver nanoparticles (carboxylate-AgNPs) to determine if interaction preference followed the Hofmeister series (Na+ > K+). We hypothesized that Na+ will show greater affinity than K+ to pair with carboxylates on AgNP surfaces, thereby destabilizing the colloidal system. Destabilization upon Na+ or K+ interacting with carboxylate-AgNPs was evaluated probing changes in multiple physicochemical characteristics: surface plasmon resonance/optical absorbance, electrical conductivity, pH, hydrodynamic diameter, electrophoretic mobility, surface charge, amount of Na+/K+ directly associated with AgNPs, and Ag+ dissociation kinetics. We show that Na+ and K+ react differently, indicating local Na+ pairing with carboxylates on AgNP surfaces is kinetically faster and remarkably favored over K+, thus supporting Hofmeister ordering. Our results suggest that AgNPs may transform into micron-size aggregates upon release into aqueous environments and that the fate of such aggregates may need consideration when assessing environmental risk. (C) 2014 Elsevier B.V. All rights reserved. |
英文关键词 | Hofmeister series;silver nanoparticles;monovalent cations;interaction preference;colloidal stability |
语种 | 英语 |
WOS记录号 | WOS:000347293800002 |
来源期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/56942 |
作者单位 | 1.CNR, Washington, DC 20001 USA; 2.US EPA, Natl Hlth & Environm Effects Res Lab, Western Ecol Div, Corvallis, OR 97333 USA |
推荐引用方式 GB/T 7714 | Pokhrel, Lok R.,Andersen, Christian P.,Rygiewicz, Paul T.,et al. Preferential interaction of Na+ over K+ with carboxylate-functionalized silver nanoparticles[J]. 美国环保署,2014,490:11-18. |
APA | Pokhrel, Lok R.,Andersen, Christian P.,Rygiewicz, Paul T.,&Johnson, Mark G..(2014).Preferential interaction of Na+ over K+ with carboxylate-functionalized silver nanoparticles.SCIENCE OF THE TOTAL ENVIRONMENT,490,11-18. |
MLA | Pokhrel, Lok R.,et al."Preferential interaction of Na+ over K+ with carboxylate-functionalized silver nanoparticles".SCIENCE OF THE TOTAL ENVIRONMENT 490(2014):11-18. |
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