impact of alginate composition on the magnetic properties of alginate/mn0.25fe2.75o4/ag ferrogels

A series of alginate/mn0.25fe2.75o4/ag ferrogels was prepared using the encapsulation method. meanwhile, mn0.25fe2.75o4/ag was synthesized through co-precipitation and chemical reduction from natural iron sand. mn0.25fe2.75o4/ag nanoparticles exhibit a cubic structure, as confirmed by x-ray diffraction (xrd) data analysis. the mn0.25fe2.75o4/ag crystal phase is formed with a higher electron density of approximately 31.53 electrons per å3. characterization of the samples’ functional groups via fourier transform infrared (ftir) showed that alginate/mn0.25fe2.75o4/ag-encapsulated ferrogel was successfully formed. the magnetic properties of the samples were characterized using a vibrating sample magnetometer (vsm). vsm data analysis reveals that all samples exhibit superparamagnetism, with a field coercivity ranging from 0.013 to 0.018 emu/g. the saturation magnetization and remanence of alginate/mn0.25fe2.75o4/ag ferrogel were increased with higher alginate composition, a sample containing 9% alginate yielded the highest saturation magnetization value. this value for saturation magnetization is inversely related to magnetic particle size, making it more responsive to external magnetic fields. however, at an alginate composition of 11%, the saturation magnetization and remanence of the sample decreased considerably. this reduction indicates that the 11% alginate composition is ideal for stabilizing and encapsulating mn0.25fe2.75o4/ag nanoparticles. this composition effectively dampens the magnetic spin interaction between the dipole moments in the ferrogel.