Altering Surface Charge Nonuniformity on Individual Colloidal Particles

Jason D. Feick, Nkiru Chukwumah, Alexandra E. Noel, Darrell Velegol

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


Charge nonuniformity (σζ) was altered on individual polystyrene latex particles and measured using the novel experimental technique of rotational electrpphoresis. It has recently been shown that unaltered sulfated latices often have significant charge nonuniformity (σζ = 100 mV) on individual particles. Here it is shown that anionic polyelectrolytes and surfactants reduce the native charge nonuniformity on negatively charged particles by 80% (σζ = 20 mV), even while leaving the average surface charge density almost unchanged. Reduction of charge uniformity occurs as large domains of nonuniformity are minimized, giving a more random distribution of charge on individual particle surfaces. Targeted reduction of charge nonuniformity opens new opportunities for the dispersion of nanoparticles and the oriented assembly of particles.

Original languageEnglish (US)
Pages (from-to)3090-3095
Number of pages6
Issue number8
StatePublished - Apr 13 2004

All Science Journal Classification (ASJC) codes

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


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