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Thermal and physicochemical properties of silicone-based composites reinforced with silanized magnetic powder

Powojska Anna, Niewęgłowska Joanna, Mystkowska Joanna

Engineering of Biomaterials

2023

vol. 26, no. 170

2--8

Silicone-based materials are of great interest in medicine and cosmetic applications because of their biocompatibility and elasticity. Recently, there has been a significant focus on the development of functional materials that integrate multiple desirable characteristics. Elastic composites reinforced with magnetic filler are active in a magnetic field. These materials can be an interesting alternative to the currently used materials, after appropriate modification of the NdFeB powder. From the point of view of the use of materials in biomedical engineering, they require a lot of research and analysis to determine whether they are useful and will not cause potentially negative effects on a living organism. The aim of the work was to verify the influence of the powder silanization method on the thermal and physicochemical properties of silicone-based composites reinforced with NdFeB powder. The appropriate selection of the silanization parameters used in the process allows control of the properties of the composite. The powder surface silanization execution affects the physicochemical and thermal stability of the prepared composites. It has been established that, depending on the method of silanization, the composite properties were changed. The obtained experimental results may lead to further research on the functionalization of elastic composites reinforced with magnetic powder.

Chemical stability assessment of soft magnetic composites for biomedical applications

Powojska Anna, Niewęgłowska Joanna, Suska Sylwia, Cavadas Adelio, Mystkowska Joanna

Engineering of Biomaterials

2022

vol. 25, no. 164

2--8

Silicone-based elastic composites with a metallic filler have been strongly developed in recent years. These materials are considered applicable in many fields of science, including medicine. The advantageous mechanical parameters provided by the NdFeB micropowder reinforcement are balanced by the elasticity and biocompatibility guaranteed by the silicone matrix. So far, there have been several reports regarding such composites’ properties important from the biomedical point of view. The article deals with the physicochemical parameters of the new material for medical applications as well as the properties of the incubation liquid. The aim of the work was to determine effects of both the magnetic particles content (0, 30, 50, 70 wt%) and the incubation process under physiological conditions on the physicochemical properties of the material and the solution after incubation. The samples were incubated for various periods of time (8, 16 and 24 weeks) at the temperature of 37°C in a 0.9 wt% NaCl solution. The density, water contact angle, and water absorption of the materials were measured. The electrolytic conductivity, pH value, redox potential, surface tension, and kinematic viscosity were determined for the liquids after the materials incubation. The results obtained for pure silicone and the silicone-based composite reinforced with NdFeB microparticles were compared. The results indicate that incubation affects the samples and liquids, changing their physiochemical properties. For composites, the density decreased, which results in a noticeable concentration of the examined elements in the solutions.