Page 159 - Environmental Nanotechnology Applications and Impacts of Nanomaterials

Methods for Structural and Chemical Characterization of Nanomaterials 145

15 0,3

Nano-maghemite Cell media
initial size
10 0,2

% vol. Intensity

5 0,1

0 0
0,01 0,1 1 10 100 1000
Hydrodynamic diameter (micrometer)
Figure 4.24 Evolution of the size of nano-maghemite nanoparticles
in DMEM nutritive medium (pH = 7.4) measured by Photon
Correlation Spectroscopy (PCS). (Courtesy of Mélanie Auffan)

140
Nutritive solution (abiotic)
Hydrodynamic diameter (nm) 100
120

80

60
40

20
0
10 –5 10 –4 10 –3 10 –2 10 –1
Concentration in nano-maghemites in g/L
Figure 4.25 Stability of a DMSA-coated nano-Fe 2 O 3 sus-
pension as a function of their concentration in an abiotic
supplemented DMEM (contact time 48 hr). (Courtesy
of Mélanie Auffan)