The size of particle aggregates produced by flocculation with PNIPAM, as a function of temperature

Elizaveta Burdukova, Naoyuki Ishida, Timothy Shaddick, George V. Franks

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


This work investigates the effect of temperature on the size of alumina aggregates formed by flocculation with temperature responsive Poly(N-Isopropylacrylamide)(PNIPAM). The results are discussed in terms of the effects of temperature on particle collision, particle adhesion and aggregate breakage. It was found that the size of alumina aggregates increases with increasing solution temperature. Particle/particle collision and aggregate breakage are largely unaffected by increasing solution temperature and therefore could not account for the change in aggregate size. The dominant factor in aggregate growth with increasing temperature was found to be the increase in the force of adhesion between alumina particles. The appearance of the adhesive force is triggered by the increase in temperature above the lower critical solution temperature of PNIPAM.

Original languageEnglish
Pages (from-to)82-88
Number of pages7
JournalJournal of Colloid And Interface Science
Issue number1
Publication statusPublished - Feb 1 2011
Externally publishedYes


  • Aggregate size
  • Solid-liquid separation
  • Solids dewatering
  • Temperature-sensitive polymer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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