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Zeta potential as function of pH for nanoparticles functionalized with APS and CMDx molecules and suspended in 1 mM KNO3. Filled Squares illustrate CMDx-a-coated magnetic nanoparticles. Filled triangles show magnetic nanoparticles functionalized with CMDx-b molecules. Filled diamonds represent CMDx-c-coated magnetic nanoparticles
