Quantitative measurement of nanoparticle halo formation around colloidal microspheres in binary mixtures

Fan Zhang, Gabrielle G. Long, Pete R. Jemian, Jan Ilavsky, Valeria T. Milam, Jennifer A. Lewis

Research output: Contribution to journalArticle

Abstract

A new colloidal stabilization mechanism, known as nanoparticle "haloing" (Tohver, V.; Smay, J. E.; Braem, A.; Braun, P. V.; Lewis, J. A. Proc. Natl. Acad. Sci. U.S.A. 2001, 98, (16), 8950-8954), has been predicted theoretically and inferred experimentally in microsphere-nanoparticle mixtures that possess high charge and size asymmetry. The term "halo" implies the existence of a nonzero separation distance between the highly charged nanoparticles and the negligibly charged microspheres that they surround. By means of ultrasmall-angle X-ray scattering, we have quantified the microsphere-nanoparticle separation distance as well as the number of nanoparticles and their lateral separation distance within the self-organized halos that form in these binary mixtures.

Original languageEnglish (US)
Pages (from-to)6504-6508
Number of pages5
JournalLangmuir
Volume24
Issue number13
DOIs
StatePublished - Jul 1 2008

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Zhang, F., Long, G. G., Jemian, P. R., Ilavsky, J., Milam, V. T., & Lewis, J. A. (2008). Quantitative measurement of nanoparticle halo formation around colloidal microspheres in binary mixtures. Langmuir, 24(13), 6504-6508. https://doi.org/10.1021/la702968n