Structure and "surfactochromic" properties of conjugated polyelectrolyte (CPE): Surfactant complexes between a cationic polythiophene and SDS in water

Matti Knaapila, Rachel C. Evans, Vasil M. Garamus, L. Almásy, Noémi K. Székely, Andrea Gutacker, Ullrich Scherf, Hugh D. BurrowsO

Research output: Article

54 Citations (Scopus)

Abstract

We report on the phase transitions, solution structure, and consequent effect on the photophysical properties of poly[3-(6-trimethylammoniumhexyl) thiophene] bromide (P3TMAHT) in aqueous sodium dodecylsulfate (SDS). Polythiophene was mixed with SDS or deuterated SDS to form P3TMAHT(SDS)x complex (x = the molar ratio of surfactant over monomer units) in D 2O and studied by small-angle neutron and X-ray scattering (SANS/SAXS) and optical spectroscopy. At room temperature, P3TMAHT forms charged aggregates with interparticle order. The addition of SDS eliminates the interparticle order and leads to rod-like (x=1/5) or sheet-like polymer-SDS aggregates (x=1/2 to 1) containing rod-like (x=1/5 to 1/2) or sheet-like (x=1/2 to 1) polymer associations. Partial precipitation occurs at the charge compensation point (x = 1). Ellipsoidal particles without interparticle order, reminiscent of SDS micelles modified by separated polymer chains, occur for x=2 to 5. Free SDS micelles dominate for x=20. Structural transitions lead to a concomitant variation in the solution color from red (P3TMAHT) to violet (x=1/5 to 1) to yellow (x > 2). The photoluminescence fingerprint changes progressively from a broad featureless band (x = 0) through the band narrowing and appearance of vibronic structure (x=1/5 to 1) to the return to a blue-shifted broad emission band (x=5). The polymer stiffness reaches a maximum for x=1, which leads to minimization of the Stokes shift (0.08 eV). This work gives fundamental information upon how surfactant complexation can influence both the solution structure and photophysical properties of a water-soluble polythiophene.

Original languageEnglish
Pages (from-to)15634-15643
Number of pages10
JournalLangmuir
Volume26
Issue number19
DOIs
Publication statusPublished - okt. 5 2010

Fingerprint

Polyelectrolytes
Surface-Active Agents
Surface active agents
Sodium
surfactants
sodium
thiophenes
Water
Thiophene
Polymers
water
Bromides
bromides
polymers
Micelles
micelles
rods
sodium bromides
Phase Transition
Neutrons

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy
  • Medicine(all)

Cite this

Structure and "surfactochromic" properties of conjugated polyelectrolyte (CPE) : Surfactant complexes between a cationic polythiophene and SDS in water. / Knaapila, Matti; Evans, Rachel C.; Garamus, Vasil M.; Almásy, L.; Székely, Noémi K.; Gutacker, Andrea; Scherf, Ullrich; BurrowsO, Hugh D.

In: Langmuir, Vol. 26, No. 19, 05.10.2010, p. 15634-15643.

Research output: Article

Knaapila, M, Evans, RC, Garamus, VM, Almásy, L, Székely, NK, Gutacker, A, Scherf, U & BurrowsO, HD 2010, 'Structure and "surfactochromic" properties of conjugated polyelectrolyte (CPE): Surfactant complexes between a cationic polythiophene and SDS in water', Langmuir, vol. 26, no. 19, pp. 15634-15643. https://doi.org/10.101/la102591b
Knaapila, Matti ; Evans, Rachel C. ; Garamus, Vasil M. ; Almásy, L. ; Székely, Noémi K. ; Gutacker, Andrea ; Scherf, Ullrich ; BurrowsO, Hugh D. / Structure and "surfactochromic" properties of conjugated polyelectrolyte (CPE) : Surfactant complexes between a cationic polythiophene and SDS in water. In: Langmuir. 2010 ; Vol. 26, No. 19. pp. 15634-15643.
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