Influence of the Surface Container Nature on the Magnetic Properties of a Magnetic Eutectic Mixture

The effect of polypropylene and glass materials on the magnetic properties of a magnetic eutectic mixture (MEM) composed of iron chloride hexahydrate (FeCl₃·6H₂O) and ethylene glycol (EG) (i.e., FeCl₃·6H₂O:EG, molar ratio of 1:2) has been investigated. In both materials, magnetization (M) curves at 300 and 358 K and effect of temperature are studied. As a result, MEM exhibits paramagnetic behavior. However, MEM on polypropylene exhibits a higher slope of the linear fit at 300 K (i.e., 4.03 × 10^-6 emu g^-1 Oe^-1) compared to 358 K (i.e., 1.90 × 10^-6 emu g^-1 Oe^-1) and a decrease of its M with increasing temperature. Conversely, MEM on glass exhibits a lower slope of the linear fit at 300 K (i.e., 4.05 × 10^-6 emu g^-1 Oe^-1) compared to 358 K (i.e., 4.55 × 10^-6 emu g^-1 Oe^-1), remaining practically stable at higher temperatures. Notably, magnetization on polypropylene (i.e., 4.46 × 10^-2 emu g^-1) is higher at room temperature than that of glass (i.e., 3.86 × 10^-2 emu g^-1), whereas at synthesis temperature, glass shows a higher magnetization (i.e., 3.75 × 10^-2 emu g^-1) compared to polypropylene (i.e., 3.43 × 10^-2 emu g^-1). These findings underscore the influence of surface containers on the magnetic properties of MEM, which should be considered when selecting materials for specific chemical applications.