Size-Selective Precipitation and Aggregate Reduction of FePt-Based Nanoparticles

Figure 6

TEM image of sample C after sonicating at 200 W (a) without surfactants and (b) with addition of oleic acid and oleylamine for 30 min (insets are magnified images). The effect of sonication time and power is compared with TEM images in (c) with a longer time of 60 min and (d) with a smaller power of 170 W.

(a)

(b)

(c)

(d)