Enhanced translational diffusion of rubrene in sucrose benzoate

Justin Rajesh Rajian, Wei Huang, Ranko Richert, Edward L. Quitevis

Research output: Contribution to journalArticle

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Abstract

The translational diffusion of rubrene in the fragile molecular glass former, sucrose benzoate (SB) (fragility index m≈94), has been studied from T g+6 K to T g+71 K(T g=337 K) by using the technique of holographic fluorescence recovery after photobleaching. In the temperature range of the measurements, the translational relaxation functions were observed to decay exponentially, indicating that Fick's law of diffusion governs the translational motion of rubrene in sucrose benzoate. The value of the translational diffusion coefficient D T obtained from the 1/e time of the translational relaxation function varied from 5.3×10 -15 cm 2 s -1 at 343 K to 5.0×10 -9 cm 2 s -1 at 408 K. The temperature dependence of D T for diffusion of rubrene in SB is compared with that of the viscosity and the dielectric relaxation time τ D of SB. The temperature dependence of D T is weaker than that of T/η for T<1.2T g but tracks the reciprocal of the dielectric relaxation time 1/τ D for 1.05T g<T<1.21T g. The translational diffusion coefficient at T g is enhanced by a factor of ≈ 2.5×10 2 over the value predicted by the Stokes-Einstein equation. The decoupling of probe diffusion from the viscosity is characterized by a scaling law, D T∼η , with ξ=0.729.

Original languageEnglish (US)
Article number014510
JournalJournal of Chemical Physics
Volume124
Issue number1
DOIs
StatePublished - 2006

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sucrose
Benzoates
Sucrose
diffusion coefficient
Dielectric relaxation
relaxation time
viscosity
Relaxation time
temperature dependence
translational motion
Einstein equations
decoupling
scaling laws
Viscosity
Fick's laws
Photobleaching
Scaling laws
recovery
fluorescence
Temperature

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Enhanced translational diffusion of rubrene in sucrose benzoate. / Rajian, Justin Rajesh; Huang, Wei; Richert, Ranko; Quitevis, Edward L.

In: Journal of Chemical Physics, Vol. 124, No. 1, 014510, 2006.

Research output: Contribution to journalArticle

Rajian, Justin Rajesh ; Huang, Wei ; Richert, Ranko ; Quitevis, Edward L. / Enhanced translational diffusion of rubrene in sucrose benzoate. In: Journal of Chemical Physics. 2006 ; Vol. 124, No. 1.
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