Reducing surface charge nonuniformity on individual particles through annealing

Jason D. Feick, Darrell Velegol

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


In the absence of molecular additives, polystyrene latex particles have been shown to be nonuniformly charged. Using the technique of rotational electrophoresis, it has been shown that the standard deviation of ζ potential on individual "bare" particles can be 50-75% of the average ζ potential. With the addition of molecular additives, the charge nonuniformity can be greatly reduced. Now, it is shown that another route to reducing the charge nonuniformity is to anneal the particles at a temperature above the glass transition temperature of the polymer. Annealing reduces the charge nonuniformity by up to 80% on individual particles. Effects on interparticle forces and stability are discussed.

Original languageEnglish (US)
Pages (from-to)3478-3483
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Issue number14
StatePublished - Jul 7 2004

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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