Advanced

Ellipsometric characterization of ethylene oxide-butylene oxide diblock copolymer adsorption at the air-water interface

Blomqvist, B R; Benjamins, Jan-Willem LU ; Nylander, Tommy LU and Arnebrant, T (2005) In Langmuir 21(11). p.5061-5068
Abstract
Ellipsometry was used to determine the adsorbed layer thickness (d) and the surface excess (adsorbed amount, Gamma) of a nonionic diblock copolymer, E106B16, of poly(ethylene oxide) (E) and poly(butylene oxide) (13) at the air-water interface. The results were obtained (i) by the conventional ellipsometric evaluation procedure using the change of both ellipsometric angles, T and A and (ii) by using the change of A only and assuming values of the layer thickness. It was demonstrated that the calculated surface excesses from the different methods were in close agreement, independent of the evaluation procedure, with a plateau adsorption of about 2.5 mg/m(2) (400 A(2)/molecule). Furthermore, the amount of E106B16 adsorbed at the air-water... (More)
Ellipsometry was used to determine the adsorbed layer thickness (d) and the surface excess (adsorbed amount, Gamma) of a nonionic diblock copolymer, E106B16, of poly(ethylene oxide) (E) and poly(butylene oxide) (13) at the air-water interface. The results were obtained (i) by the conventional ellipsometric evaluation procedure using the change of both ellipsometric angles, T and A and (ii) by using the change of A only and assuming values of the layer thickness. It was demonstrated that the calculated surface excesses from the different methods were in close agreement, independent of the evaluation procedure, with a plateau adsorption of about 2.5 mg/m(2) (400 A(2)/molecule). Furthermore, the amount of E106B16 adsorbed at the air-water interface was found to be almost identical to that adsorbed from aqueous solution onto a hydrophobic solid surface. In addition, the possibility to use combined measurements with H2O or D2O as substrates to calculate values of d and F was investigated and discussed. We also briefly discuss within which limits the Gibbs equation can be used to determine the surface excess of polydisperse block copolymers. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
21
issue
11
pages
5061 - 5068
publisher
The American Chemical Society
external identifiers
  • wos:000229243800046
  • pmid:15896051
  • scopus:20444372651
ISSN
0743-7463
DOI
10.1021/la0468040
language
English
LU publication?
yes
id
e1783c32-3e1f-44bf-8a90-6ce5e25441b4 (old id 157210)
date added to LUP
2007-07-10 17:19:39
date last changed
2017-08-13 03:31:52
@article{e1783c32-3e1f-44bf-8a90-6ce5e25441b4,
  abstract     = {Ellipsometry was used to determine the adsorbed layer thickness (d) and the surface excess (adsorbed amount, Gamma) of a nonionic diblock copolymer, E106B16, of poly(ethylene oxide) (E) and poly(butylene oxide) (13) at the air-water interface. The results were obtained (i) by the conventional ellipsometric evaluation procedure using the change of both ellipsometric angles, T and A and (ii) by using the change of A only and assuming values of the layer thickness. It was demonstrated that the calculated surface excesses from the different methods were in close agreement, independent of the evaluation procedure, with a plateau adsorption of about 2.5 mg/m(2) (400 A(2)/molecule). Furthermore, the amount of E106B16 adsorbed at the air-water interface was found to be almost identical to that adsorbed from aqueous solution onto a hydrophobic solid surface. In addition, the possibility to use combined measurements with H2O or D2O as substrates to calculate values of d and F was investigated and discussed. We also briefly discuss within which limits the Gibbs equation can be used to determine the surface excess of polydisperse block copolymers.},
  author       = {Blomqvist, B R and Benjamins, Jan-Willem and Nylander, Tommy and Arnebrant, T},
  issn         = {0743-7463},
  language     = {eng},
  number       = {11},
  pages        = {5061--5068},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Ellipsometric characterization of ethylene oxide-butylene oxide diblock copolymer adsorption at the air-water interface},
  url          = {http://dx.doi.org/10.1021/la0468040},
  volume       = {21},
  year         = {2005},
}