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Polymer Brushes: Probing the Collapse Dynamics of Poly(N-isopropylacrylamide) Brushes by AFM: Effects of Co-nonsolvency and Grafting Densities (Small 10/2011)

Authors

  • Xiaofeng Sui,

    1. Department of Materials Science and Technology of Polymers, University of Twente, MESA+ Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede, The Netherlands
    Current affiliation:
    1. [+] These authors contributed equally to this work.
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  • Qi Chen,

    1. Department of Materials Science and Technology of Polymers, University of Twente, MESA+ Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede, The Netherlands
    Current affiliation:
    1. [+] These authors contributed equally to this work.
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  • Mark A. Hempenius,

    1. Department of Materials Science and Technology of Polymers, University of Twente, MESA+ Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede, The Netherlands
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  • G. Julius Vancso

    Corresponding author
    1. Department of Materials Science and Technology of Polymers, University of Twente, MESA+ Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede, The Netherlands
    • Department of Materials Science and Technology of Polymers, University of Twente, MESA+ Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede, The Netherlands.
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Abstract

original image

The cover picture illustrates the reversible collapse and swelling of poly(N-isopropylacrylamide) brushes induced at room temperature by the variation of solvent composition from water to methanol-water mixtures. Brushes with different grafting densities were obtained by surface-initiated polymerizations. The effective values of the Young's modulus of the polymer brushes in the collapsed and swollen states were determined by atomic force microscopy (AFM). The variation of adherence between AFM colloidal probes and brush surfaces in different solvents was assessed, and the collapse dynamics was investigated by monitoring the change in adherence in real-time by AFM colloidal probes. For more information, please read the Full Paper “Probing the Collapse Dynamics of Poly(N-isopropylacrylamide) Brushes by AFM: Effects of Co-nonsolvency and Grafting Densities” by G. J. Vancso and co-workers, beginning on page 1440.

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