3.8 Vibrating Sample Magnetometer (VSM) Analysis
One of the most important properties of the synthesized metal-organic
framework (NiFe2O4@
SiO2@HKUST-1) is its magnetic property which, having
been synthesized at different weight percentages (50-30-10%) of nickel
ferrite, will also have different magnetic properties, and these
magnetic properties are highly dependent on the size of the
nanocomposite particle. For this purpose, VSM analysis was used to
evaluate their magnetic properties, which is visible in Fig (11).
Fig (11): Vibrating Sample Magnetometer (VSM) Analysis
Magnetic parameters including magnetic saturation, residual torque and
coercive force are listed in Table (2). The results show that the
magnetic properties of the metal-organic framework increased with
increasing the percentage of nickel ferrite from 10% to 50%. It can
also be seen that the HKUST-1 organic metal framework alone has no
magnetic properties, and by composing it with ferrite nickel, the
resulting composite has a magnetic property. By not saturating the
diagrams of all the samples, as well as using constituents that have
atoms that have permanent magnetic moments such as (nickel and iron
oxide), this metal-organic framework falls into the category of
superparamagnetic. Because the atoms mentioned above act separately and
without any interaction. As a result, they have a different and random
orientation, which is influenced by an external field in an approximate
direction, which is characteristic of superparamagnetic materials. These
results are consistent with previous data for nickel nanoparticles in
the silica matrix and confirm the accuracy of the synthesis [62,63].