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Polyvinyl alcohol (PVA)/Fe 3 O 4 magnetic hydrogels had been fabricated by freezingthawing (F-T) cycle technique, employing natural iron sand as the raw material for the magnetic microand nano-sized fillers. An exploration of the durability and magnetoelasticity as well as PVA hydrogel applications in the assessment of human brain tumor was also intensively conducted. The performance of the PVA and magnetic hydrogels mainly depends on the structural dynamic properties, such as polymeric crystallization and particle size. The durability of PVA/Fe 3 O 4 magnetic hydrogels affecting the magnetoelasticity is determined by the concentration ratio of PVA and water, number of F-T cycles, and the concentration of Fe 3 O 4 particles. By controlling those parameters, it was found that hydrogels had PVA: water ratio of 23:100 and four times F-T cycles possessed good mechanical properties. Due to the biocompatible character, the PVA hydrogel was used in the assessment of the human brain tumor, analyzed from the apparent diffusion coefficient (ADC) value representing the diffusion coefficient of a biological tissue. It was found that the abnormal tissue has a low ADC value compared with the normal one. Moreover, the higher b-value of the diffusion-weighted magnetic resonance imaging (DW-MRI) measurement is more preferred in obtaining a good contrast of the data imaging.

Development of PVA/Fe3O4 as Smart Magnetic Hydrogels for Biomedical Applications