标题: 以化学法和物理法合成奈米级磷灰石粉末
Synthesis nano-apatite powders by chemical and physcial methods
作者: 陈碧真
Bi-Jean Chen
陈三元
Dr. San-Yuan Chen
材料科学与工程学系
关键字: 奈米;磷灰石;nano;apatote;hydroxyapatite
公开日期: 2001
摘要: 本论文以合成奈米级的磷灰石为主要目的,因此,将论文分为主要的两个架构:以化学法溶胶凝胶法合成奈米级的磷酸盐与以物理法用雷射剥离激发氢氧基磷灰石靶材得奈米级的磷酸盐粉末。在溶胶凝胶法合成磷灰石方面,选择了三种不同的钙与磷当成前驱溶液的来源,分别是第一组Ca(OC2H5)2 + P(OC2H5)3,第二组Ca(NO3)2.4H2O + P(OC2H5)3以及第三组Ca(OH)2+ H3PO4。这三组不同的钙与磷来源以Ca/P莫耳比计量合成的磷灰石粉末大部分的粒径大小都属于奈米级的,第一组合成的是稳定的磷酸钙相,后两组合成的是稳定的氢氧基磷灰石相。以准分子雷射剥离制备奈米级磷灰石粉末方面,将雷射频率控制在1Hz,改变雷射能量及雷射腔体压力这两个参数。结果显示在雷射能量较低与腔体压力较低的条件下,靶材受激发后所收集到的粉末其粒径大小分布较均匀,粒径大小是属于奈米级的。
Nano-apatite powders have been synthesized by chemical and physical methods in this research. The chemical and physical processes used in this study were sol-gel and excimer laser ablation methods, respectively. In sol-gel method, various calcium and phosphate sources with Ca/P ratio of 1.67 were used as the starting precursors to fabricate nano-apatite powders. These calcium and phosphate sources were categorized as Ca(OC2H5)2 + P(OC2H5)3, Ca(NO3)2.4H2O + P(OC2H5)3, and Ca(OH)2 + H3PO4. Although nano-apatite powders can be produced by all these three sources, hydroxyapatite (HAp) as surface-active bioceramics can be only obtained from Ca(NO3)2.4H2O + P(OC2H5)3 and Ca(OH)2 + H3PO4. In contrast, calcium phosphate (TCP) as resorbable bioceramics was fabricated by Ca(OC2H5)2 + P(OC2H5)3. In excimer laser ablation method, the effects of laser energy and chamber pressure on the material properties of final apatite product were investigated. It was observed that the nano-apatite powders derived from low laser energy and chamber pressure would have narrow particle size distribution and good crystallinity.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT900159006
http://hdl.handle.net/11536/68254
显示于类别:Thesis