摘要
运用X射线衍射(XRD)、傅立叶变换红外光谱(FTIR)、热重-差热(TG-DTA)、扫面电子显微镜(SEM)等分析方法对水热改性前及改性不同阶段乌贼骨的矿物组成、表面形貌等进行了表征、分析,并对水热反应机理进行了研究．结果显示,原始乌贼骨主要由棒状文石层堆砌而成,外观呈多孔的房架式结构．在磷酸盐溶液中水热处理后,内部的文石经由固态局部规整离子交换反应(Solid-state topotactic ion exchange reaction)转变为羟基磷灰石,原来文石结晶体的形貌及规则排列方式没有改变;而外表面文石则通过溶解-重结晶(Dissolutionrecrystallization) 过程转变为鳞片状的羟基磷灰石,随着水热处理时间的延长,鳞片状羟基磷灰石进一步自组装成5μm左右的规则圆球,本文对自组装的机理也做了初步探讨．
The composition and morphology of original cuttlebone and hydroxyapatite（HAP）- converted cuttlebone were characterized by means of X-ray diffraction （XRD）, Fourier transmission infrared spectroscopy （FTIR）, thermogravimetric-differential thermal analysis（TG-DTA） and scanning electron microscopy （SEM）. The mechanism of self-assembly was also discussed. The results show that the mineral of original cuttlebone is rod-like aragonite polymorph of CaCO3 and the chamber-like macroporous architecture is its extrinsic feature. In phosphate solution, the interior aragonite converts hydrothermally to HAP by a solid-state topotactic ion-exchange reaction in which the HAP retains the morphology and the orientation of the original aragonite. Meanwhile, the exterior aragonite converts hydrothermally to HAP via dissolution-recrystallization, with squama-like morphology. These squama-like HAP self-assemble to microspheres with hydrothermal reaction time prolonged.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第2期433-440,共8页
Journal of Inorganic Materials
关键词
乌贼骨
羟基磷灰石
水热反应
反应机理
cuttlebone
hydroxyapatite
hydrothermal conversion
reaction mechanism
