Browse

Fluorescence studies of polymer adsorption. 4. pH effect on the adsorption of pyrene-end-tagged poly(ethylene glycol) on colloidal silica

Cited 15 time in Web of Science Cited 14 time in Scopus
Authors
Char, Kookheon; Frank, Curtis W.; Gast, Alice P.
Issue Date
1990-04
Publisher
American Chemical Society
Citation
Langmuir, 1990, 6, 767-770
Abstract
The effect of pH on the adsorption of pyrene-end-labeled poly(ethy1ene glycol) (Py-PEG-Py) and its subsequent rearrangement and displacement upon adsorption of untagged PEG were investigated with photostationary excimer fluorescence. A slight pH effect was detected for Py-PEG-Py of molecular weight 8650 (Py-PEG-Py(8650)) upon adsorption of PEG(22 OOO). The fluorescence results support the picture that the probe chains adsorb more strongly to silica at pH 4.2 than at pH 7.1. No pH effect for Py-PEG-Py(4250) was detected, presumably due to the dominance of the entropic effect on exchange with untagged PEG(22 OOO) over the enthalpic interaction between the tracer chain and the surface. Comparison with predictions from a model taking into account the rearrangement of a tracer chain on the surface shows qualitative agreement for both Py-PEG-Py(4250) and Py-PEG-Py(8650).
ISSN
0743-7463 (print)
1520-5827 (online)
Language
English
URI
http://hdl.handle.net/10371/5768
DOI
https://doi.org/10.1021/la00094a008
Files in This Item:
There are no files associated with this item.
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse