Using Voronoi tessellations to assess nanoparticle-nanoparticle interactions and ordering in monolayer films formed through electrophoretic deposition

Alex J. Krejci, Colin G.W. Thomas, Jyotirmoy Mandal, Isabel Gonzalo-Juan, Weidong He, Ryan L. Stillwell, Ju Hyun Park, Dhiraj Prasai, Vyacheslav Volkov, Kirill I. Bolotin, James H. Dickerson

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Monolayers of iron oxide nanoparticles of two different sizes, 9.6 nm and 16.5 nm, were fabricated through electrophoretic deposition. The arrangements of nanoparticles within the films were analyzed using the technique of Voronoi tessellations. These analyses indicated that the films possessed equivalent degrees of ordering, and that the films were uniform over centimeter length scales. Precise measurements of the interparticle spacing were obtained, and the magnitudes of magnetic dipole interactions were calculated. The dipole-dipole interaction among the larger nanoparticles was 14 times larger than that of the smaller nanoparticles, indicating that magnetic coupling interactions could not have been the lone source of ordering in the system.

Original languageEnglish (US)
Pages (from-to)1664-1669
Number of pages6
JournalJournal of Physical Chemistry B
Volume117
Issue number6
DOIs
StatePublished - Feb 14 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

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