Small 2008 Jan;4(1):119-26
Materials Science and Technology of Polymers, Faculty of Science and Technology, and MESA Institute for Nanotechnology, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands.
Submicrometer-sized particles of poly(N-isopropylacrylamide) (PNIPAM) are synthesized by surfactant-free radical polymerization. The morphology and nanomechanical properties of individual, isolated PNIPAM microgel particles at the silicon/air and silicon/water interfaces, below and above the PNIPAM volume-phase-transition temperature (VPTT), are probed by atomic force microscopy. In air, and in water below the VPTT, the PNIPAM spheres are flattened and adopt a pancakelike shape. Read More