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    Temperature-Responsive Solid-Liquid Separations with Charged Block-Copolymers of Poly(N-isopropyl acryamide)

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    Author
    O'Shea, J-P; Qiao, GG; Franks, GV
    Date
    2012-01-10
    Source Title
    LANGMUIR
    Publisher
    AMER CHEMICAL SOC
    University of Melbourne Author/s
    O'SHEA, JOHN-PAUL; Qiao, Greg; Franks, George
    Affiliation
    Chemical And Biomolecular Engineering
    Metadata
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    Document Type
    Journal Article
    Citations
    O'Shea, J. -P., Qiao, G. G. & Franks, G. V. (2012). Temperature-Responsive Solid-Liquid Separations with Charged Block-Copolymers of Poly(N-isopropyl acryamide). LANGMUIR, 28 (1), pp.905-913. https://doi.org/10.1021/la2038872.
    Access Status
    This item is currently not available from this repository
    URI
    http://hdl.handle.net/11343/32611
    DOI
    10.1021/la2038872
    Description

    C1 - Journal Articles Refereed

    Abstract
    Temperature responsive charged block-copolymers of poly(N-isopropylacrylamide) (PNIPAM) have been used in the solid-liquid separation of alumina mineral particles from aqueous solution. The effects of temperature, polymer charge-sign and fraction of charged segment have been investigated. Batch settling and adsorption studies showed that rapid sedimentation results for suspensions with polymers of opposite charge-sign to the particle surface-charge (counterionic) at 50 °C. Cooling the suspensions after flocculation at 50 °C was found to increase the final solids volume fraction of the sediment beds formed through a mechanism related to partial desorption of polymer and the reduction of the hydrophobic attraction. Suspension stability results after dosing with polymers of similar charge-sign to the particle surface-charge (co-ionic) at both 25 and 50 °C. Increasing the amount of polymer charge increased the influence of polymer charge-sign on the adsorption and solid-liquid separation behavior. The performance of the charged block copolymers are compared to that of the random charged copolymer and neutral homopolymer PNIPAM structures.
    Keywords
    Polymerisation Mechanisms; Chemical Engineering not elsewhere classified; Expanding Knowledge in Engineering

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