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

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

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 languageEnglish
Pages (from-to)1177-1180
Number of pages4
JournalJournal of Chemical Physics
Volume89
Issue number2
DOIs
StatePublished - 1 Jan 1988
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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