The fractal nature of the surfaces of porous silicas as revealed in electronic energy transfer between adsorbates: Comparison of three donor/acceptor pairs

Dina Pines; Dan Huppert; David Avnir

doi:10.1063/1.455226

The fractal nature of the surfaces of porous silicas as revealed in electronic energy transfer between adsorbates: Comparison of three donor/acceptor pairs

Dina Pines, Dan Huppert, David Avnir

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Abstract

Electronic energy transfer between adsorbed rhodamine 6G (R6G, donor) and malachite green (MG, acceptor) was studied on nonporous silica, on silica with average pore diameter of 60 Å (Si-60), on Si-100 and on Si-200. The decay profiles obey the Klafter-Blumen equation for the survival probability in fractal environments, with fractal dimensions D of 2.1, 2.3, 2.5, and 2.7, respectively, in good agreement with the results obtained with two other pairs, rhodamine-B/MG and R6G/R6G (in a depolarization experiment). The invariance of D to changes in the critical Förster radius, suggests that the derived D values reflect structural scale invariance properties of the supports and in particular the surface fractal dimension as "seen" by surface/molecule interaction. This interpretation compares favorably with other surface studies of SiO₂.

Original language	English
Pages (from-to)	1177-1180
Number of pages	4
Journal	Journal of Chemical Physics
Volume	89
Issue number	2
DOIs	https://doi.org/10.1063/1.455226
State	Published - 1 Jan 1988
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "The fractal nature of the surfaces of porous silicas as revealed in electronic energy transfer between adsorbates: Comparison of three donor/acceptor pairs",

abstract = "Electronic energy transfer between adsorbed rhodamine 6G (R6G, donor) and malachite green (MG, acceptor) was studied on nonporous silica, on silica with average pore diameter of 60 {\AA} (Si-60), on Si-100 and on Si-200. The decay profiles obey the Klafter-Blumen equation for the survival probability in fractal environments, with fractal dimensions D of 2.1, 2.3, 2.5, and 2.7, respectively, in good agreement with the results obtained with two other pairs, rhodamine-B/MG and R6G/R6G (in a depolarization experiment). The invariance of D to changes in the critical F{\"o}rster radius, suggests that the derived D values reflect structural scale invariance properties of the supports and in particular the surface fractal dimension as {"}seen{"} by surface/molecule interaction. This interpretation compares favorably with other surface studies of SiO2.",

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T1 - The fractal nature of the surfaces of porous silicas as revealed in electronic energy transfer between adsorbates

T2 - Comparison of three donor/acceptor pairs

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AU - Huppert, Dan

AU - Avnir, David

PY - 1988/1/1

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N2 - Electronic energy transfer between adsorbed rhodamine 6G (R6G, donor) and malachite green (MG, acceptor) was studied on nonporous silica, on silica with average pore diameter of 60 Å (Si-60), on Si-100 and on Si-200. The decay profiles obey the Klafter-Blumen equation for the survival probability in fractal environments, with fractal dimensions D of 2.1, 2.3, 2.5, and 2.7, respectively, in good agreement with the results obtained with two other pairs, rhodamine-B/MG and R6G/R6G (in a depolarization experiment). The invariance of D to changes in the critical Förster radius, suggests that the derived D values reflect structural scale invariance properties of the supports and in particular the surface fractal dimension as "seen" by surface/molecule interaction. This interpretation compares favorably with other surface studies of SiO2.

AB - Electronic energy transfer between adsorbed rhodamine 6G (R6G, donor) and malachite green (MG, acceptor) was studied on nonporous silica, on silica with average pore diameter of 60 Å (Si-60), on Si-100 and on Si-200. The decay profiles obey the Klafter-Blumen equation for the survival probability in fractal environments, with fractal dimensions D of 2.1, 2.3, 2.5, and 2.7, respectively, in good agreement with the results obtained with two other pairs, rhodamine-B/MG and R6G/R6G (in a depolarization experiment). The invariance of D to changes in the critical Förster radius, suggests that the derived D values reflect structural scale invariance properties of the supports and in particular the surface fractal dimension as "seen" by surface/molecule interaction. This interpretation compares favorably with other surface studies of SiO2.

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The fractal nature of the surfaces of porous silicas as revealed in electronic energy transfer between adsorbates: Comparison of three donor/acceptor pairs

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