【摘 要】
：
A citrate-assisted hydrothermal method was utilized for the preparation of Sr-substituted hydroxyapatite (HA) nanoparticles. The influences of Sr-substituting degree on the phase identifications, microstructures and colloidal stability of the resultant pr
【机 构】
：
Hubei Province Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
A citrate-assisted hydrothermal method was utilized for the preparation of Sr-substituted hydroxyapatite (HA) nanoparticles. The influences of Sr-substituting degree on the phase identifications, microstructures and colloidal stability of the resultant products were studied. The experimental results show that the crystalline structures and morphologies of final resultants are significantly changed by controlling the Sr-substituting degree. As the Sr-substituting degree increases, the colloidal stability of samples first increases and then decreases rapidly; the morphology of the product first changes from nanorods to short nanorods rod and then becomes nanowires. Uniform HA hexagonal nanorods with high aspect ratio (>4.0) and excellent aqueous colloidal stability were prepared by 6 h hydrothermal reaction at 180 ℃ without Sr substitution. The dispersion underwent the phase transition from isotropic to liquid-crystalline state upon the increasing concentration of 25wt％ and the complete liquid-crystalline phase was achieved when at the concentration above 31wt％. These novel findings provide new insights into the role of Sr substitution on both the citrate-assisted hydroxyapatite crystallization and tailoring of colloidal stability. Moreover, HA liquid crystal behavior was successfully observed, which lays a foundation for the fabrication of macroscopically assembled hydroxyapatite-based biomimetic materials for biomedical applications.
其他文献
The failure patterns and energy evolution of three types of shaft lining concrete subjected to static and dynamic loading were reported. The energy and damage characteristics of concrete were determined by means of a uniaxial hydraulic servo machine, acou
By using NaOH and Na2SiO3 as the activator, the mechanical properties and shrinkage of the geopolymer after incorporation of 0％, 10％, 20％, and 30％ epoxy resin were investigated. The mechanism of epoxy resin toughening metakaolin based geopolymer was analy
To promote the photocatalytic performance TiO2 and enlarge its application in visible region, carbon doped TiO2 (C/TiO2) composites were synthesized by wet impregnation method using sucrose as a precursor and used for phenol photocatalytic reaction. The s
Polyethyleneimine (PEI) functionalized Fe3O4 MNPs were synthesized by a modified hypothermal oxidative hydrolysis method.The magnetic nanoparticles showed positively charged surface,strong magnetic responsivity and uniform particle size distribution at 56
Three CrN coatings were deposited on the Inconel X750 through the metal vapor vacuum arc ion implantation and the magnetic filtered cathodic vacuum arc deposition system (MEVVA-FCVA) with the N2 flow rates of 10,50,and 100 sccm,respectively.The surface mo
To investigate the transport characteristics of chloride ions in cement-based materials, the Mori-Tanaka (M-T) prediction scheme of the effective diffusion coefficient in composites containing single-phase and multi-phase inclusions is systematically dedu
Transparent hydroxyapatite (HAp) ceramics with the grain size ranging 86-1 300 nm were successfully synthesized by spark plasma sintering (SPS) at 925-1 200 ℃.All the sample achieved final density higher than 99.7％.The phase stability was identified by X-
To promote the stability and efficiency, quadruple-cation perovskite system (blending of MA, FA, Cs, I, Br, etc) was introduced to substitute the traditional MAPbI3 perovskite. Perovskite films degraded by water can be recovered by a simple method. The Pb
The present study aimed to improve the pervaporation (PV) performances of polydimethy-lsiloxane (PDMS) membranes by using special cross-linkers. The γ-methacryloxypropyl trimethoxy silane (KH-570) cross-linked PDMS membranes were fabricated and characteri
Based on the mechanical properties and microstructure of polyurethane foam solidified material, a two-dimensional model of polyurethane foam solidified material was constructed. Polyurethane foam was obtained by fully and uniformly mixing the two componen