Fluorescence recovery after photobleaching measurements of polymers in a surface forces apparatus
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- Fluorescence recovery after photobleaching measurements of polymers in a surface forces apparatus
- Wong, Janet S. S.; Hong, Liang; Bae, Sung Chul; Granick, Steve
- Issue Date
- JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, v.48, no.24, pp.2582 - 2588
- The surface forces apparatus has been combined with fluorescence recovery after photobleaching to measure translational diffusion of polymer confined between mica sheets. This article presents findings using polydimethylsiloxane with number-average molecular weight M n = 2200 g mol ?1, the chains end-labeled with soluble fluorescent dye. Melts with thickness 10 nm display a translational diffusion coefficient (D) with a bulk component and a slower component assigned to surface diffusion. Reduction of thickness to 1.8 nm causes mobility to split into two populations: an immobile fraction (immobile on the time scale of 30-60 min) and a mobile fraction who's D slow only weakly with diminishing film thickness. However, when load causes the confining mica sheets to flatten, D of the mobile fraction drops by up to an additional order of magnitude, depending on the local pressure that squeezes on the polymer.
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