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].