Strategy to obtain nm size crystals through precipitation in the presence of polyelectrolyte

Izumi Hirasawa*, Takashi Mikami, Akio Katayama, Takahiro Sakuma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Crystals of lead sulfate were precipitated in solutions of various polyelectrolyte polymers (acidic, neutral, and basic polymers) using a double-jet crystallizer. Polyetyleneimine (PEI) basic polymer controlled both the nucleation rate and crystal growth rate, and enabled the production of fine monodispersed crystals. The on-line measurement of the variation in the lead concentration indicated that PEI lost its effect when a certain amount of the reactants Ntot was supplied. Interaction between lead ions and PEI was detected by NMR analysis, which suggested that lead ions made some kind of complex with PEI. The values of Ntot correlated well with the weight of PEI in the solution, regardless of the feed flow rate and reactant concentration, as shown in the correlative equation Ntot = k W0.49. It was suggested that PEI could no longer control the precipitation rate when the amount of reactants supplied exceeded Ntot. Thereafter, rapid nucleation occurred. Precipitation with PEI could be controlled by a certain amount of PEI in a ground solution in order to produce monodispersed fine crystals. These results give an effective idea of how to create various nm size crystals.

Original languageEnglish
Pages (from-to)212-214
Number of pages3
JournalChemical Engineering and Technology
Issue number2
Publication statusPublished - 2006 Feb

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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