|About this Abstract
||2011 TMS Annual Meeting & Exhibition
||Surfaces and Heterostructures at Nano- or Micro-Scale and Their Characterization, Properties, and Applications
||Glass Transition at a Polymer Surface Monitored by Localized Surface Plasmon Resonance
||Kaan Kalkan, Ratan Putla
|On-Site Speaker (Planned)
We investigate glass transition on a polymer surface by embedding gold nanoparticles (AuNP). The impregnation of AuNP into the polymer causes a spectral shift in the LSPR due to the changing dielectric environment. AuNP, at an average size of 8 nm, were synthesized on poly isobutyl methacrylate (PiBMA) films on glass by thermal evaporation. Subsequently, time series LSPR spectra of AuNP on PiBMA were acquired in a temperature controlled optical cell. The effective dielectric constant surrounding the AuNP was calculated from LSPR optical extinction peak. Depth and velocity of penetration were derived from the measured dielectric constant on the basis of dielectric mixing. The onset of AuNP penetration was found to be at 45 C, which is 10 C below the reported glass transition of "bulk" PiBMA. The penetration velocity was found to be fairly constant in time until complete embedding while temperature activated at 0.05 eV.
||Planned: A CD-only volume