超声波处理对羟基磷灰石结晶形貌的影响

常压下用湿化学沉淀法经过超声处理制备羟基磷灰石 (hydroxyapatite,HA)纳米针状晶。实验中以Ca(NO3) 2 ·4H2 O和 (NH4) 2 ·HPO4为原料 ,去离子水为溶剂 ,氨水为pH调节剂。通过TEM ,XRD和IR分析 ,研究了不同工艺条件下超声处理对HA晶体形态和尺寸的影响。试验表明 :超声处理可引起HA晶体的形状和尺寸的变化 ,针状晶沿长径方向都有所增长 ,晶簇更加明显。与高温下烧结的HA相比 ,这些晶体表现出一种弱结晶的磷灰石结构

INFLUENCE OF ULTRASONIC TREATMENT ON THE MORPHOLOGY OF HYDROXYAPATITE CRYSTALS

Nanograde needle-like hydroxyapatite (HA) crystals were prepared by a wet chemical precipitation method under atmospheric pressure with ultrasonic technique, using calcium nitrate and diammonium hydrogen phosphate as reactant, deionized water as solvent and ammonia as pH adjusting agent. Influences of ultrasonic treatment on crystal morphology and size of HA under different conditions of the process were studied by transform electron microscopy, X-ray diffraction and infrared spectroscopy. It is found that the shape and the size of HA crystals are changed after ultrasonic treatment . The diameter and length of these needle-like crystals become larger and the clusters of crystals are more clearly . These crystals show a poorly crystallized apatite structure as compared with HA sintered at higher temperature.