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Bae, Sung Chul
Multiscale Optical Imaging Lab
Research Interests
  • Multiscale optical imaging, laser spectroscopy, laser microscopy, laser sensing, soft matter physics, surface and interfacial science, laser Matter Interaction

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Polymer Surface Diffusion in the Dilute Limit

Cited 17 times inthomson ciCited 15 times inthomson ci
Title
Polymer Surface Diffusion in the Dilute Limit
Author
Wong, Janet S. S.Hong, LiangBae, Sung ChulGranick, Steve
Keywords
Aqueous system; Center-of-mass; Diffusion coefficients; Dilute limit; Polymer diffusion; Power law; Quartz surfaces; Solid-liquid interfaces; Surface coverages
Issue Date
201104
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v.44, no.8, pp.3073 - 3078
Abstract
The molecular weight (M) dependence of the center-of-mass surface diffusion coefficient (D) is measured for polystyrene adsorbed from chloroform, a good solvent, in the dilute limit of surface coverage. On as-received smooth quartz surfaces, we reproduce D ∼ M -3/2, the same power law observed earlier in aqueous systems for a much smaller range of M. This is consistent with computer simulations in the literature regarding 2D diffusion between obstacles. But on smoother surfaces, mica and thermally annealed quartz, we observe Rouse scaling, D ∼ M -1, to our knowledge the first time this theoretically expected scaling has been observed for polymer diffusion at the solid-liquid interface. For polystyrene of the highest molecular weight diffusing on the rougher surfaces, in the range (1-6.7) × 10 5 g mol -1, the dependence on M softens to weaker than a power law of -3/2. This weaker dependence, consistent with D ∼ M -1 over the limited range of available M, may suggest reversion toward Rouse behavior.
URI
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DOI
http://dx.doi.org/10.1021/ma1024939
ISSN
0024-9297
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