Analysis and Characterization of Manufactured Nanoparticles in Aquatic Environments - Environmental and Human Health Impacts of Nanotechnology - page 229

NIR Light
Source

6 ... 2300 g

Sample

Time
Colour Coded

∆ t

T ime

Transmission
Profiles

S pace CCD Sensor

Radial Position

Figure 6.6 Analytical centrifuge showing the light source that is passed through the dis-
persed sample; the transmission of light is recorded as a function of time on a CCD sensor.
Thus, settling rates of and settling profi les can be monitored at a higher gravity over time.
(Reproduced with permission from L.U.M. GmbH.)

Flow Flow To Detector To Detector

Figure 6.7 The separating principle of Field-Flow Fractionation showing the laminar fl ow
profi le, and the steady state distribution of particles as a result of balanced transport by the
fi eld and concentration driven diffusion.