- Site-specific anchoring of a flavonol dye into zeolite beta nanoparticles

Auteur(s): Doussineau T, Berthomieu D, Floquet N., Smaihi M

(Article) Publié: Journal Of Physical Chemistry C, vol. 111 p.7578-7585 (2007)


Microporous zeolite nanoparticles have been used as a host for the confinement of 3-hydroxyflavone (3-OHF), leading to stable fluorescent colloids that may constitute a first step in the development of future biomarkers. Prior to the dye inclusion, the host physicochemical properties (porosity and crystalline structure) have been extensively studied. In particular, conditions for obtaining a template-free host have been established. It has been shown that standard calcination procedures, required to reveal the micropores, cannot be straighforward applied since they leave a non-negligible concentration of template residues in the host. Afterward, structural and chemical characterization, as well as simulation of 3-OHF-loaded zeolite beta colloids enabled to determine the presence and location of chelates in the zeolite micropores. Characterization of the dye loading by independent techniques involving elemental analysis, pore volume, and crystalline structure investigations highlighted the determinant impact of prior calcination treatments and the presence in the zeolite micropores of trapped solvent molecules simultaneously with the dye.

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