Abstract
We investigated the correlation between optical sensing performance and morphology of micrometer-sized magnetic optical sensor particles (MOSePs). Oxygen-sensitive MOSePs were produced via spray-drying, a technique suitable for particle production from polymers in various solvents. A common problem of precipitation and polymerization techniques is the inhomogeneous distribution of dispersed nanoparticles. In spray-drying, this phenomenon is suppressed by fast solvent evaporation. The resulting sensor particles responded to changing analyte concentration within seconds, their Stern–Volmer calibration was highly linear, and they were magnetically controllable. The sensor characteristics resulted from the porosity of the matrix polymer, which enabled fast analyte diffusion towards the sensitive dye. Diffusion distances were further reduced by the formation of hollow particles. This was caused by the sequential drying of the polymer-solution droplet from the outside to the inside. Finally, the suitability of different polymers and magnetic nanoparticles for the production of MOSePs via spray-drying was evaluated.
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The authors thank S. Fladischer, C. Mayrhofer, and E. Ingolic from the Austrian Centre for Electron Microscopy and Nanoanalysis for their technical support.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00706-010-0285-5
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Koren, K., Mistlberger, G., Aigner, D. et al. Characterization of micrometer-sized magnetic optical sensor particles produced via spray-drying. Monatsh Chem 141, 691–697 (2010). https://doi.org/10.1007/s00706-010-0262-z
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DOI: https://doi.org/10.1007/s00706-010-0262-z