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Single-Molecule Studies of Heterogeneous Dynamics in Polymer Melts Near the Glass Transition
Laura A. Deschenes,David A. Vanden Bout*
Single-molecule spectroscopy was used to follow the
orientation of a single probe molecule in a polymer film in real time.Broad spatially heterogeneous dynamics were observed on long timescales, which result from simple diffusive rotational motionson short
time scales. This diffusive behavior persists for manyrotations before
the molecule's local environment changes to onecharacterized by a new
time scale. This environmental exchangeoccurs instantaneously on the
time scale of the experiment andmay arise from large-scale collective
motions. The distributionof exchange times for these environments was
measured for severaltemperatures near the glass transition.
Department of Chemistry and Biochemistry, Center for Nano and
Molecular Materials Science and Technology; and Texas Materials
Institute, University of Texas, Austin, TX 78712-1167, USA.
*
To whom correspondence should be addressed. E-mail:
davandenbout{at}mail.utexas.edu
Direct Experimental Evidence of a Growing Length Scale Accompanying the Glass Transition.
L. Berthier, G. Biroli, J.-P. Bouchaud, L. Cipelletti, D. E. Masri, D. L'Hote, F. Ladieu, and M. Pierno (2005)
Science
310, 1797-1800
|Abstract »|Full Text »|PDF »
Single metallic nanoparticle imaging for protein detection in cells.
L. Cognet, C. Tardin, D. Boyer, D. Choquet, P. Tamarat, and B. Lounis (2003)
PNAS
100, 11350-11355
|Abstract »|Full Text »|PDF »
Room temperature measurements of the 3D orientation of single CdSe quantum dots using polarization microscopy.
