Dimer-to-monomer transformation of Rhodamine 6G in aqueous PEO−PPO−PEO block copolymer solutions

Vogel, R., Harvey, M., Edwards, G., Meredith, P., Heckenberg, N., Trau, M. and Rubinsztein-Dunlop, H. (2002) Dimer-to-monomer transformation of Rhodamine 6G in aqueous PEO−PPO−PEO block copolymer solutions. Macromolecules, 35 6: 2063-2070. doi:10.1021/ma010995l


Author Vogel, R.
Harvey, M.
Edwards, G.
Meredith, P.
Heckenberg, N.
Trau, M.
Rubinsztein-Dunlop, H.
Title Dimer-to-monomer transformation of Rhodamine 6G in aqueous PEO−PPO−PEO block copolymer solutions
Journal name Macromolecules   Check publisher's open access policy
ISSN 0024-9297
1520-5835
Publication date 2002-03-12
Sub-type Article (original research)
DOI 10.1021/ma010995l
Volume 35
Issue 6
Start page 2063
End page 2070
Total pages 8
Editor Timothy P. Lodge
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Collection year 2002
Language eng
Subject C1
249901 Biophysics
780102 Physical sciences
Formatted abstract
To construct a viable dye-based microlaser, it is necessary to achieve very high dye concentrations in a solid matrix. Increased aqueous solubility of the laser dye Rhodamine 6G has been demonstrated in liquid and gel phases, using the triblock copolymer P123 as a surfactant. An increased monomer concentration and the suppression of aggregation of the dye molecules were observed using spectral absorption and fluorescence measurements. The micellation of P123 was studied using differential scanning calorimetry. The optical and thermal data suggest that this micellation process leads to a partitioning of Rhadamine 6G in solution and ultimately drives the equilibrium toward monomer retention. Results from a linear partitioning model support this hypothesis and are in qualitative agreement with the experimental data. These findings pave the way for higher concentrations of Rhodamine 6G to be used in aqueous-based dye lasers and also indicate how Rhodamine 6G could be used in solid-state microlaser systems.
© 2002 American Chemical Society
Keyword Polymer Science
Poly(oxyethylene)-poly(oxypropylene)-poly(oxyethylene) Triblock Copolymers
Angle Neutron-scattering
Propylene-oxide
Ethylene-oxide
Fluorescence Behavior
Aggregation Behavior
Light-scattering
Association
Micelle
Water
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 03:21:45 EST