COLL 455 |
| Mikhail Motornov1, Ganna Gorodyska2, Robert Lupitskiy3, Roman Sheparovych3, Anton Kiriy4, Constantinos Tsitsilianis5, Manfred Stamm6, and Sergiy Minko3. (1) Department of Polymer Interfaces, Institut fuer Polymerforschung Dresden, Hohe Strasse 6, Dresden, 01069, Germany, (2) Department of Structure and Mechanics, Instutut fuer Polymerforschung Dresden, Hohe Strasse 6, 01069 Dresden, Germany, (3) Department of Chemistry, Clarkson University, Clarkson Ave. 8, Potsdam, NY 13699, (4) Department of Polymer Interface, Instutut fuer Polymerforschung Dresden, Hohe Strasse 6, 01069 Dresden, Germany, (5) Department of Chemical Engineering, University of Patras, Patras, 26500, Greece, (6) Department of Physical Chemistry and Physics of Polymers, Institut fuer Polymerforschung Dresden, Hohe Strasse 6, Dresden, 01069, Germany |
| We report on smart colloidal and nano- particles reversibly switching their interactions upon external signal (pH, salt, temperature). The particles have a core-shell morphology. The shell is constituted from spherical mixed polymer brushes when two different by chemical nature polymers are grafted to the one core. Controlled change of the environmental conditions causes changes in a subtle interplay between electrostatic, hydrophobic interactions, or hydrogen bonding. Microphase segregation in the shell induced by the changes in environmental media strongly alternates the surface composition of the shell and interactions between particles. We demonstrate several examples for the application of the smart colloids to reversibly tune interactions in colloidal systems. |
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“Smart” Polymers on Surfaces and Colloids
2:00 PM-4:40 PM, Wednesday, March 31, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |