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. Author manuscript; available in PMC: 2013 May 30.
Published in final edited form as: Chem Mater. 2011 Apr 12;23(7):1985–1992. doi: 10.1021/cm200399t

FIGURE 4.

FIGURE 4

Agglomerate SiO2-coated (a) and uncoated (b) 35Ag/Fe2O3 particle size distributions as determined by dynamic light scattering (hydrodynamic diameter) in water (solid lines) and in phosphate buffer saline (PBS) solution (broken lines) immediately after their dispersion (t = 0 hours). Images of dispersion of the SiO2-coated (c) and uncoated 35Ag/Fe2O3 (d) nanoparticles immediately after their dispersion (t = 0 hours) and after 2 hours in water (top) and PBS (bottom). The hybrid SiO2-coated Ag/Fe2O3 nanoparticles remain stable while the uncoated ones flocculate (agglomerate) and settle after a few hours.