Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.066101
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Funding
- NSF [CMMI-0846267]
- ChemMatCARS
- APS
- DOE, Office of Basic Energy Science [DE-AC02-06CH11357]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0846267] Funding Source: National Science Foundation
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By embedding dilute'' gold nanoparticles in single polystyrene thin films as markers'', we probe the local viscosity of the free surface at temperatures far above the glass transition temperature (T(g)). The technique used was x-ray photon correlation spectroscopy with resonance-enhanced x-ray scattering. The results clearly showed the surface viscosity is about 30% lower than the rest of the film. We found that this reduction is strongly associated with chain entanglements at the free surface rather than the reduction in T(g).
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