Colloid and Polymer Science

, Volume 290, Issue 10, pp 931–940 | Cite as

Effects of addition of anionic and cationic surfactants to poly(N-isopropylacrylamide) microgels with and without acrylic acid groups

  • Nodar Al-Manasir
  • Kaizheng Zhu
  • Anna-Lena Kjøniksen
  • Kenneth D. Knudsen
  • Bo NyströmEmail author
Original Contribution


The interaction of the anionic surfactant sodium dodecyl sulfate (SDS) and the cationic surfactant hexadecyl trimethyl ammonium bromide with poly(N-isopropylacrylamide) (PNIPAAM) microgels with and without poly(acrylic acid) (PAA) was investigated by means of dynamic light scattering (DLS), zeta potential, and turbidimetry measurements. The DLS results show that the PNIPAAM microgels with PAA will contract when an anionic or cationic surfactant is added to the suspension, while the PNIPAAM microgels without PAA expand in the presence of an ionic surfactant. A collapse of the PNIPAAM microgels is observed when the temperature is increased. From the zeta potential measurements, it is observed that the charge density of PNIPAAM microgels in the presence of an ionic surfactant is significantly affected by temperature and the attachment of the negatively charged PAA groups. The turbidity measurements clearly indicate that the interaction between PNIPAAM and SDS is more pronounced than that of the cationic surfactant.


Temperature-responsive contraction Aggregation Charged surfactant PNIPAAM Dynamic light scattering Turbidity Zeta potential 



We gratefully acknowledge the financial support from the Norwegian Research Council for projects 177665/V50 and 190403.


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Nodar Al-Manasir
    • 1
  • Kaizheng Zhu
    • 1
  • Anna-Lena Kjøniksen
    • 1
    • 2
  • Kenneth D. Knudsen
    • 3
  • Bo Nyström
    • 1
    Email author
  1. 1.Department of ChemistryUniversity of OsloOsloNorway
  2. 2.Department of Pharmaceutics, School of PharmacyUniversity of OsloOsloNorway
  3. 3.Department of PhysicsInstitute for Energy TechnologyKjellerNorway

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