Synthesis and Properties of Polyacrylamide Ferrogels Filled with Magnetic Nanoparticles of Strontium Hexaferrite

• Published in: Inorganic materials : applied research Vol. 13; no. 5; pp. 1270 - 1277
• Main Authors: Mikhnevich, E. A., Safronov, A. P.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.10.2022; Springer Nature B.V
• Subjects: Adhesion; Chemistry; Chemistry and Materials Science; Enthalpy; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Magnetic fields; Magnetic properties; Magnetostriction; Materials for Human Life Support and Environmental Protection; Materials Science; Modulus of elasticity; Nanoparticles; Polyacrylamide; Swelling; magnetic field; elastic modulus; ferrogel
• ISSN: 2075-1133; 2075-115X
• DOI: 10.1134/S2075113322050288

Ferrogels based on polyacrylamide with embedded magnetic particles of strontium hexaferrite SrFe 12 O 19 with their content up to 17.9 wt % have been synthesized and studied. The enthalpy of adhesion of polyacrylamide to the surface of particles is determined by the calorimetric method using a thermochemical cycle. Its negative values indicate good adhesion. This leads to a significant decrease in the degree of swelling of ferrogels with increasing particle content. The modulus of elasticity of ferrogels is measured under uniaxial compression with and without an external uniform magnetic field of 27.5 mT. The effect of a uniform magnetic field of 420 mT on the magnetostriction of ferrogels has been studied. It has been shown that ferrogels based on polyacrylamide filled with strontium hexaferrite underwent universal stretching in a magnetic field, leading to an increase in their volume and additional swelling.