Blob Size Controls Diffusion of Free Polymer in a Chemically Identical Brush in Semidilute Solution

Macromolecules
Zhenyu J ZhangMark Geoghegan

Abstract

The diffusion of rhodamine-labeled poly(ethylene glycol) (r-PEG) within surface-grafted poly(ethylene glycol) (s-PEG) layers in aqueous solution at 18 °C was measured by fluorescence correlation spectroscopy. The diffusion coefficient of r-PEG within s-PEG was controlled by the grafting density, σ, and scaled as σ-1.42±0.09. It is proposed that a characteristic blob size associated with the grafted (brush) layer defines the region through which the r-PEG diffusion occurs. The diffusion coefficients for r-PEG in semidilute solution were found to be similar to those in the brushes.

References

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Citations

Mar 15, 2019·Nanoscale·Christopher G ClarksonMark Geoghegan
May 5, 2021·The Journal of Chemical Physics·Matthew MearsMark Geoghegan
Jul 27, 2021·ACS Macro Letters·David BurgessZhenyu J Zhang

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Methods Mentioned

BETA
fluorescence correlation spectroscopy
FCS
force
quartz-crystal microbalance
AFM
neutron reflectometry

Software Mentioned

ConfoCor
FCS
Nanoscope

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