Aggregation of ferrihydrite nanoparticles in aqueous systems

Virany M. Yuwono, Nathan Burrows, Jennifer A. Soltis, Tram Anh Do, R. Lee Penn

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Crystal growth by non-classical mechanisms, such as oriented aggregation, frequently involves an aggregation step. The aggregation of nanoparticles is sensitive to solution variables like ionic strength and pH, as well as the presence and concentration of other chemical species. Aggregation is a critical first step during the early stages of oriented aggregation. Time-resolved, cryogenic transmission electron microscopy was employed to characterize the degree of aggregation, the reversibility of aggregation, and the influence of additives on aggregation in aqueous suspensions. In this work, freshly synthesized ferrihydrite nanoparticles in aqueous suspension were employed as the model system. These nanoparticles are largely aggregated even with a solution pH several pH units away from the point of zero net proton charge (PZNPC) and a very low ionic strength (<10 -4 M). Reversibility of aggregation was observed to be time-dependent. Finally, chemical additives dramatically change the evolution of aggregation state with strongly coordinating ligands strongly suppressing aggregation, even after aging at an elevated temperature.

Original languageEnglish (US)
Pages (from-to)235-245
Number of pages11
JournalFaraday Discussions
Volume159
DOIs
StatePublished - Nov 1 2012

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Agglomeration
Nanoparticles
nanoparticles
cryogenics
crystal growth
transmission electron microscopy
ligands
protons
Ionic strength
Suspensions
ferrihydrite
temperature
Crystallization
Cryogenics
Protons
Aging of materials
Ligands
Transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

Yuwono, Virany M. ; Burrows, Nathan ; Soltis, Jennifer A. ; Anh Do, Tram ; Lee Penn, R. / Aggregation of ferrihydrite nanoparticles in aqueous systems. In: Faraday Discussions. 2012 ; Vol. 159. pp. 235-245.
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Aggregation of ferrihydrite nanoparticles in aqueous systems. / Yuwono, Virany M.; Burrows, Nathan; Soltis, Jennifer A.; Anh Do, Tram; Lee Penn, R.

In: Faraday Discussions, Vol. 159, 01.11.2012, p. 235-245.

Research output: Contribution to journalArticle

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