Dilution destabilizes engineered ligand-coated nanoparticles in aqueous suspensions

Wan, Jiamin; Kim, Yongman; Mulvihill, Martin J.; Tokunaga, Tetsu K.

doi:10.1002/etc.4103

Title: Dilution destabilizes engineered ligand-coated nanoparticles in aqueous suspensions

Journal Article · Thu Jan 25 00:00:00 EST 2018 · Environmental Toxicology and Chemistry

DOI:https://doi.org/10.1002/etc.4103· OSTI ID:1532316

Wan, Jiamin ^[1]; Kim, Yongman ^[1]; Mulvihill, Martin J. ^[2]; Tokunaga, Tetsu K. ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)

Abstract It is commonly true that a diluted colloidal suspension is more stable over time than a concentrated one because dilution reduces collision rates of the particles and therefore delays the formation of aggregates. However, this generalization does not apply for some engineered ligand‐coated nanoparticles (NPs). We observed the opposite relationship between stability and concentration of NPs. We tested 4 different types of NPs: CdSe‐11‐mercaptoundecanoic acid, CdTe‐polyelectrolytes, Ag‐citrate, and Ag‐polyvinylpyrrolidone. The results showed that dilution alone induced aggregation and subsequent sedimentation of the NPs that were originally monodispersed at very high concentrations. Increased dilution caused NPs to progressively become unstable in the suspensions. The extent of the dilution impact on the stability of NPs is different for different types of NPs. We hypothesize that the unavoidable decrease in free ligand concentration in the aqueous phase following dilution causes detachment of ligands from the suspended NP cores. The ligands attached to NP core surfaces must generally approach exchange equilibrium with free ligands in the aqueous phase; therefore, ligand detachment and destabilization are expected consequences of dilution. More studies are necessary to test this hypothesis. Because the stability of NPs determines their physicochemical and kinetic behavior including toxicity, dilution‐induced instability needs to be understood to realistically predict the behavior of engineered ligand‐coated NPs in aqueous systems. Environ Toxicol Chem 2018;37:1301–1308. © 2018 SETAC

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1532316

Alternate ID(s):: OSTI ID: 1430747

Journal Information:: Environmental Toxicology and Chemistry, Vol. 37, Issue 5; ISSN 0730-7268

Publisher:: SETACCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Dilution
Ligand‐coated nanoparticle
Engineered nanoparticle
Aggregation
Silver nanoparticle
Cadmium selenide nanoparticle

Title: Dilution destabilizes engineered ligand-coated nanoparticles in aqueous suspensions

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