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A simple method to control morphology of hydroxyapatite nano- and microcrystals by altering phase transition route

机译:通过改变相变路径控制羟基磷灰石纳米晶体和微晶形态的简单方法

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摘要

Hydroxyapatite (HAp) particles with various morphologies such as sphere, rod, whisker, and platelet have attracted a great deal of scientific and technological interest for their broad utilization as reinforcing agents in bone cement, bone fillers, drug carriers, and adsorbents for chromatography. In this Article, a simple method to control the morphology of HAp particles by adjusting the initial pH of precursors and the amount of gelatin and urea additions is introduced. Initially formed calcium phosphate products such as octacalcium phosphate (OCP), hydroxyapatite (HAp), and amorphous calcium phosphate (ACP) are found to be altered by changing the pH of solutions, which induces variation of HAp morphology as well as phase transformation route to HAp. From the observation of HAp formation behavior, the addition of gelatin is revealed to retard HAp formation as well as to change the aspect ratio of HAp particles, which is ascribed to strong adsorption of gelatin on the surface of calcium phosphate. Also, urea is observed to boost HAp formation rate by enhancing hydrolysis reaction. Through the understanding of the influence of the aforementioned variables, the morphology of pure HAp particles is successfully controlled, and this enables the promotion of the applicability of HAp particles in various fields.
机译:球形,棒状,晶须和血小板等各种形态的羟基磷灰石(HAp)颗粒作为其在骨水泥,骨填充剂,药物载体和色谱吸附剂中的增强剂得到了广泛的应用,引起了广泛的科学技术兴趣。在本文中,介绍了一种通过调节前体的初始pH值和明胶和尿素添加量来控制HAp颗粒形态的简单方法。发现最初形成的磷酸钙产物,例如磷酸八钙(OCP),羟基磷灰石(HAp)和无定形磷酸钙(ACP)会通过改变溶液的pH值而改变,从而引起HAp形态的变化以及相变途径。哈从观察到的HAp形成行为可以看出,明胶的添加可以延缓HAp的形成并改变HAp颗粒的长宽比,这归因于明胶在磷酸钙表面的强烈吸附。而且,观察到尿素通过增强水解反应来提高HAp形成速率。通过了解上述变量的影响,成功地控制了纯HAp颗粒的形态,这可以促进HAp颗粒在各个领域的适用性。

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