Professionally dedicated to the field of calcium sulfate and hydroxyapatite whiskers
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.
07
2025/08
Study on the Circularly Polarized Fluorescence Properties of Bacterial Cellulose
Cellulose is the most abundant and easily renewable resource in nature, and the effective utilization of this type of resource is undoubtedly green and economical. Among them, bacterial cellulose (BC) has advantages over cellulose from other sources, such as high purity, high crystallinity, and good biocompatibility, which has increasingly attracted researchers' interest. Bacterial cellulose has been widely applied in fields such as biomedicine, electrical materials, and optical materials. Meanwhile, circularly polarized light can contain and transmit richer information than ordinary light sources, thus attracting attention in many fields such as optical display devices, information encryption materials, biological coding, optical information storage, and optical devices. There have been many studies on the circular polarization properties of other forms of cellulose, especially crystalline nanocellulose, but the circular polarization properties of bacterial cellulose have not yet been reported.
07
2025/08
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.
07
2025/08
Hydrothermal Preparation of Hydroxyapatite Whiskers and Study on Their Needle-like Growth Mechanism
Hydroxyapatite whiskers have good biocompatibility and mechanical properties, making them a biomedical material with broad application prospects. The hydrothermal synthesis of hydroxyapatite whiskers offers good reproducibility, ease of control, high crystallinity, uniform shape, and stable performance.
Using self-made CaHPO_4 as the nutrient, hydroxyapatite whiskers were prepared by the hydrothermal method. The obtained whiskers were systematically tested and qualitatively analyzed. The effects of parameters such as temperature, heating rate, pH, pressure, filling degree, and nutrient on whisker growth under hydrothermal conditions were discussed. Various crystal defects formed during the whisker growth process were analyzed, and solutions were proposed. Additionally, the crystallography and interfacial kinetics mechanisms of the needle-like growth of hydroxyapatite whiskers were explored.
Experimental results show that hydrothermal synthesis can produce needle-like hydroxyapatite whiskers with an average length of 1 mm and an aspect ratio of 60 to 80. It was found that temperature, heating rate, pH, pressure, and nutrients affect the solubility of CaHPO_4, thereby changing the supersaturation of the system and influencing the growth of hydroxyapatite whiskers. Low supersaturation and low pH favor the needle-like growth of hydroxyapatite whiskers. Analysis indicates that the mechanism of needle-like growth of hydroxyapatite whiskers is: on one hand, the number of Ca~(2+) connections to Ca-P_6O_(24) on the c-plane is higher than on the a and b planes, making the c-plane more stable and having a higher growth rate.
07
2025/08
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