Effect of ionic strength on the kinetics of crystal growth by oriented aggregation

Nathan Burrows, Christopher R.H. Hale, R. Lee Penn

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Oriented aggregation is an important, nonclassical crystal growth mechanism that occurs in a wide array of materials, often producing nanoparticles with unique, anisotropic, and symmetry-defying morphologies. The growth of acicular goethite (α-FeOOH) nanorods from ellipsoidal ferrihydrite (Fe 5HO 8·4H 2O) nanoparticles was used as a model system to study the effects of sodium nitrate concentration on product crystal morphology and the kinetics of growth by oriented aggregation. Time-resolved sampling and transmission electron microscopy were employed with semi-automated image analysis to quantify the growth rate constant of oriented aggregation. Results are discussed in the context of Derjaguin and Landau, Verwey and Overbeek (DLVO) theory through the use of quantitative statistical comparisons and modeling of rate constants. Increasing the concentration of sodium nitrate results in an increasing second-order growth rate constant. The magnitude of increase depends on the primary particle size; however, the magnitude and trend in size dependence did not follow predictions based on DLVO theory.

Original languageEnglish (US)
Pages (from-to)4787-4797
Number of pages11
JournalCrystal Growth and Design
Volume12
Issue number10
DOIs
StatePublished - Oct 3 2012

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Crystallization
Ionic strength
Crystal growth
crystal growth
Rate constants
Agglomeration
sodium nitrates
Kinetics
Nitrates
kinetics
Sodium
Nanoparticles
Nanorods
nanoparticles
Image analysis
crystal morphology
Particle size
image analysis
Sampling
nanorods

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Burrows, Nathan ; Hale, Christopher R.H. ; Penn, R. Lee. / Effect of ionic strength on the kinetics of crystal growth by oriented aggregation. In: Crystal Growth and Design. 2012 ; Vol. 12, No. 10. pp. 4787-4797.
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Effect of ionic strength on the kinetics of crystal growth by oriented aggregation. / Burrows, Nathan; Hale, Christopher R.H.; Penn, R. Lee.

In: Crystal Growth and Design, Vol. 12, No. 10, 03.10.2012, p. 4787-4797.

Research output: Contribution to journalArticle

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AU - Burrows, Nathan

AU - Hale, Christopher R.H.

AU - Penn, R. Lee

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