Details
| Original language | English |
|---|---|
| Pages (from-to) | 5591-5595 |
| Number of pages | 5 |
| Journal | Journal of Physical Chemistry B |
| Volume | 106 |
| Issue number | 22 |
| Publication status | Published - 11 May 2002 |
Abstract
The translational motion of single terrylenediimide (TDI) dye molecules incorporated into the organic part of a surfactant-silica mesostructure of a monolithic M41S host was observed by confocal microscopy. Only isotropic motion was found indicating that the channel-like motion lies below the optical resolution limit of the experiment. An effective diffusion constant was evaluated to be D = 3.72 × 10-2 μm2 s-1. In contrast, for the TDI molecules diffusing in the pure lyotropic hexagonal phase of the same surfactant in water, a one-dimensional anisotropic diffusion with a diffusion constant of D = 2.07 μm2 s-1 was measured. The decrease in D and the occurrence of isotropic diffusion on the length scale of the optical experiment on going from the lyotropic phase to the mesostructured host are attributed to an increase in viscosity and tortuosity due to the formation of the silica walls around the template micelles in the synthesis of the M41S material. Apart from the mobile fraction, which shows normal diffusion, a stationary fraction of ∼ 10% of TDI molecules is observed; however, no intermediate cases were detected.
ASJC Scopus subject areas
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Journal of Physical Chemistry B, Vol. 106, No. 22, 11.05.2002, p. 5591-5595.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Observation of translational diffusion of single terrylenediimide molecules in a mesostructured molecular sieve
AU - Seebacher, Christian
AU - Hellriegel, Christian
AU - Deeg, Fred Walter
AU - Bräuchle, Christoph
AU - Altmaier, Stephan
AU - Behrens, Peter
AU - Müllen, K.
PY - 2002/5/11
Y1 - 2002/5/11
N2 - The translational motion of single terrylenediimide (TDI) dye molecules incorporated into the organic part of a surfactant-silica mesostructure of a monolithic M41S host was observed by confocal microscopy. Only isotropic motion was found indicating that the channel-like motion lies below the optical resolution limit of the experiment. An effective diffusion constant was evaluated to be D = 3.72 × 10-2 μm2 s-1. In contrast, for the TDI molecules diffusing in the pure lyotropic hexagonal phase of the same surfactant in water, a one-dimensional anisotropic diffusion with a diffusion constant of D = 2.07 μm2 s-1 was measured. The decrease in D and the occurrence of isotropic diffusion on the length scale of the optical experiment on going from the lyotropic phase to the mesostructured host are attributed to an increase in viscosity and tortuosity due to the formation of the silica walls around the template micelles in the synthesis of the M41S material. Apart from the mobile fraction, which shows normal diffusion, a stationary fraction of ∼ 10% of TDI molecules is observed; however, no intermediate cases were detected.
AB - The translational motion of single terrylenediimide (TDI) dye molecules incorporated into the organic part of a surfactant-silica mesostructure of a monolithic M41S host was observed by confocal microscopy. Only isotropic motion was found indicating that the channel-like motion lies below the optical resolution limit of the experiment. An effective diffusion constant was evaluated to be D = 3.72 × 10-2 μm2 s-1. In contrast, for the TDI molecules diffusing in the pure lyotropic hexagonal phase of the same surfactant in water, a one-dimensional anisotropic diffusion with a diffusion constant of D = 2.07 μm2 s-1 was measured. The decrease in D and the occurrence of isotropic diffusion on the length scale of the optical experiment on going from the lyotropic phase to the mesostructured host are attributed to an increase in viscosity and tortuosity due to the formation of the silica walls around the template micelles in the synthesis of the M41S material. Apart from the mobile fraction, which shows normal diffusion, a stationary fraction of ∼ 10% of TDI molecules is observed; however, no intermediate cases were detected.
UR - http://www.scopus.com/inward/record.url?scp=0037030877&partnerID=8YFLogxK
U2 - 10.1021/jp013198y
DO - 10.1021/jp013198y
M3 - Article
AN - SCOPUS:0037030877
VL - 106
SP - 5591
EP - 5595
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1089-5647
IS - 22
ER -