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Polymers 2011, 3, 1575-1590; doi:10.3390/polym3041575 OPEN ACCESS polymers ISSN 2073-4360 /journal/polymers Article The Effect of Co-Monomer Content on the Swelling/Shrinking and Mechanical Behaviour of Individually Adsorbed PNIPAM Microgel Particles ⋆ ¨ ¨ Anna Burmistrova, Marcel Richter, Michael Eisele, Cagri Uzum and Regine von Klitzing ¨ ¨ Stranski-Laboratorium fur Physikalische und Theoretische Chemie, Institut fur Chemie, Technische ¨ Universitat Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany; E-Mails: burmistrova@mailbox.tu-berlin.de (A.B.); marcel.richter@tu-berlin.de (M.R.); ¨ miceis@freenet.de (M.E.); uzum@mailbox.tu-berlin.de (C.U.) ⋆ Author to whom correspondence should be addressed; E-Mail: klitzing@mailbox.tu-berlin.de; Tel.: +49-30-314-23476; Fax: +49-30-314-26602. Received: 15 August 2011; in revised form: 23 August 2011 / Accepted: 20 September 2011 / Published: 26 September 2011 Abstract: The swelling/deswelling behaviour of microgel particles in the bulk and at the surface was studied and correlated to their mechanical properties. We focused on two kinds of particles: pure PNIPAM and PNIPAM-co-AAc particles. It was shown that