Fluorescent nanoparticles produced in our lab are used for imaging ion concentrations and ion fluxes in biological systems such as cells during signaling and interstitial fluid during physiological homeostasis.
Dubach, J. M., Balaconis, M. K., Clark, H. A. Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems. J. Vis. Exp. (53), e2896, doi:10.3791/2896 (2011).