Preparation of Magnetic Hydroxyapatite Whiskers and Study of Their Magnetic Response Behavior under Magnetic Field-Xupu (Shanghai) Biotechnology Co., Ltd

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Preparation of Magnetic Hydroxyapatite Whiskers and Study of Their Magnetic Response Behavior under Magnetic Field

2025-08-07

The orientation of hydroxyapatite whiskers (HAw) is one of the keys to designing and developing bioceramics. In this study, magnetic nanoparticles of magnetite (Fe3O4) were loaded onto the surface of HAw using a hydrothermal method, successfully preparing magnetic HAw composites with excellent magnetic response characteristics. The physicochemical and biological properties of the magnetized HAw were systematically studied, and its orientation behavior in a weak magnetic field was explored. The results showed that magnetite (Fe3O4) nanoparticles were successfully loaded onto the surface of HAw. The prepared magnetized HAw exhibited superparamagnetism at room temperature and had good magnetic response characteristics, which could be controlled using only a conventional permanent magnet. Combined with magnetic field-induced injection molding technology, the alignment direction imposed by the external magnetic field was effectively fixed. CCK-8 experimental results indicated that the magnetized HAw was not cytotoxic.

The orientation of hydroxyapatite whiskers (HAw) is one of the keys to designing and developing bioceramics. In this study, magnetic nanoparticles of magnetite (Fe3O4) were loaded onto the surface of HAw using a hydrothermal method, successfully preparing magnetic HAw composites with excellent magnetic response characteristics. The physicochemical properties and biological performance of the magnetized HAw were systematically studied, and its orientation behavior in a weak magnetic field was explored. The results showed that magnetite (Fe3O4) nanoparticles were successfully loaded onto the surface of HAw. The prepared magnetized HAw exhibited superparamagnetism at room temperature and had good magnetic response characteristics, which could be controlled using only a conventional permanent magnet. Combined with magnetic field-induced injection molding technology, the alignment direction imposed by the external magnetic field was effectively fixed. CCK-8 experimental results showed that the magnetized HAw was not cytotoxic.

Keywords:

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Hydrothermal synthesis of hydroxyapatite whiskers

Hydroxyapatite (HA) whiskers have a low dislocation density and high tensile properties, making them suitable as toughening materials for bioceramics. The experiment synthesized HA whiskers with high crystallinity and intact grains using calcium carbonate and calcium hydrogen phosphate as raw materials through a hydrothermal method. The crystal phase composition, morphology, and structure of HA were analyzed using XRD, SEM, and FT-IR. Additionally, the ζ potential and particle size distribution of the product were measured using a particle size and ζ potential analyzer. The results indicate that increasing the hydrothermal temperature promotes crystal growth along the c-axis; at 220°C for 10 hours, HA whiskers with an end diameter of 0.8 μm and length of 6 μm were obtained, with a small amount of carbonate entering the apatite structure. The dispersion of HA in ethylene glycol is more uniform and stable than in water, with an average powder particle size of about 2 μm.

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