Abstract
Fluorescent nanoparticles have a variety of biomedical applications as diagnostics and traceable drug delivery agents. Highly fluorescent porous silica nanoparticles were synthesized in a water/oil phase by a microemulsion method. What is unique about the resulting porous silica nanoparticles is the combination of a single-step, efficient synthesis and the high stability of its fluorescence emission in the resulting materials. The key of the success of this approach is the choice of a lipid dye that functions as a surrogate surfactant in the preparation. The surfactant dye was incorporated at the interface of the inorganic silica matrix and organic environment (pore template), and thus insures the stability of the dye–silica hybrid structure. The resulting fluorescent silica materials have a number of properties that make them attractive for biomedical applications: the availability of various color of the resulting nanoparticle from among a broad spectrum of commercially dyes, the controllablity of pore size (diameters of ~5 nm) and particle size (diameters of ~40 nm) by adjusting template monomer concentration and the water/oil ratio, and the stability and durability of particle fluorescence because of the deep insertion of surfactant’s tail into the silica matrix.
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Acknowledgments
The generous financial support of the National Science Foundation (CHE 0511219478) is acknowledged. Partial support for characterization of the nanomaterials was provided by the University of Maryland-MERSEC Center. Q.L. also thanks Xiao Zhang from Rutgers University for the optical characterization.
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Liu, Q., DeShong, P. & Zachariah, M.R. One-step synthesis of dye-incorporated porous silica particles. J Nanopart Res 14, 923 (2012). https://doi.org/10.1007/s11051-012-0923-4
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DOI: https://doi.org/10.1007/s11051-012-0923-4