Environmental Recovery by Magnetic Nanocomposites Based on Castor Oil - Natural Polymers, Biopolymers, Biomaterials, and Their Composites, Blends, and IPNs - page 241

function (PDF) of the maghemite nanoparticles showed that, with 95% of confidence,
the diameters of the particles ranges between 14.1 and 46.0 nm. In addition, the most
probable observed value is equal to 27.9 nm.
Figure 5. The SAXS of the maghemite particles.
Figure 6. (a) The AFM micrograph of the maghemite nanoparticles (b) and probability density
function (PDF) of diameters of maghemite.
Magnetic force was determined using a very simple experimental setup, consti-
tuted by an analytical balance and a digital caliper, shown in Figure 7. Two removable
supports were used: the first one was placed on the plate of the balance, while the
second and highest one was settled outside the balance. The distance between the low-
est and highest tops was equal to 25.9 ± 0.2 mm. Tested materials were placed on the
support located on the plate of the balance, as shown in Figure 7. Balance was unset
and a neodymium N42 magnet--external Gauss strength and energy density equal to
13.2 kG and 42 MGOe, respectively - was placed on the highest support. Then, the