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

Izumi Hirasawa, Takashi Mikami, Akio Katayama, Takahiro Sakuma

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    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
    Volume29
    Issue number2
    DOIs
    Publication statusPublished - 2006 Feb

    Fingerprint

    Polyelectrolytes
    Lead
    crystal
    Polymers
    Crystals
    polymer
    Nucleation
    nucleation
    Ions
    Crystallizers
    Crystallization
    Crystal growth
    ion
    Flow rate
    Nuclear magnetic resonance
    nuclear magnetic resonance
    sulfate
    rate

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Environmental Science(all)
    • Chemical Engineering (miscellaneous)

    Cite this

    Strategy to obtain nm size crystals through precipitation in the presence of polyelectrolyte. / Hirasawa, Izumi; Mikami, Takashi; Katayama, Akio; Sakuma, Takahiro.

    In: Chemical Engineering and Technology, Vol. 29, No. 2, 02.2006, p. 212-214.

    Research output: Contribution to journalArticle

    Hirasawa, Izumi ; Mikami, Takashi ; Katayama, Akio ; Sakuma, Takahiro. / Strategy to obtain nm size crystals through precipitation in the presence of polyelectrolyte. In: Chemical Engineering and Technology. 2006 ; Vol. 29, No. 2. pp. 212-214.
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