摘要
羟基磷灰石(HA)晶体的形核和生长与表面活性剂、初始钙-磷物质的量比值(n_(Ca,0)/n_(P,0))密切相关。因此,本研究以油酸为表面活性剂制备高柔韧超长HA纳米纤维,利用X射线衍射(XRD)、FTIR、场发射扫描电镜(FESEM)和能量色散X射线谱(EDS)探究了不同n_(Ca,0)/n_(P,0)对HA纳米纤维微观结构的影响,并基于产物微观结构演变提出HA纳米纤维的形成机制。n_(Ca,0)/n_(P,0)=0.8~1.2有利于高结晶超长柔韧HA纳米纤维的合成,而过高和过低的n_(Ca,0)/n_(P,0)会导致油酸诱导HA沿c轴择优生长的作用减弱,进而导致非晶绳结状或低结晶纳米针束状产物的形成。HA晶体的择优生长方向随n_(Ca,0)/n_(P,0)的降低由a轴向c轴转变,但过低的n_(Ca,0)/n_(P,0)导致HA晶体倾向同时沿a轴和c轴生长。
The nucleation and crystal growth of hydroxyapatite(HA)crystals are closely related to surfactants and the initial calcium⁃phosphorus molar ratio(n_(Ca,0)/n_(P,0)).In this work,HA nanofibers with high flexibility and aspect ratio have been synthesized by using oleic acid as the surfactant.The effect of n_(Ca,0)/n_(P,0) on the microstructures of the as⁃prepared products was investigated by X⁃ray diffraction(XRD),FTIR,field emission scanning electron micro⁃scope(FESEM),and energy⁃dispersive X⁃ray spectra(EDS).The formation mechanisms of HA nanofibers were pro⁃posed to better explain the effect of oleic and n_(Ca,0)/n_(P,0) based on the microstructure evolution.Ultralong HA nanofi⁃bers with high crystallinity and flexibility were synthesized with n_(Ca,0)/n_(P,0)=0.8⁃1.2,but too high and too low n_(Ca,0)/n_(P,0) will weaken the effect of oleic acid in inducing the preferential growth of HA along the c axis,which lead to the for⁃mation of amorphous knotted or low crystalline nanoneedle bundle⁃like products,respectively.The preferred growth direction of HA changes from a⁃axis to c⁃axis with the decrease of n_(Ca,0)/n_(P,0),but too low n_(Ca,0)/n_(P,0) causes HA to tend to grow along the a⁃axis and c⁃axis at the same time.
作者
王银川
肖桂勇
徐伟莉
齐美丽
颜文熙
武延秋
吕宇鹏
WANG Yin-Chuan;XIAO Gui-Yong;XU Wei-Li;QI Mei-Li;YAN Wen-Xi;WU Yan-Qiu;LÜYu-Peng(Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education,Shandong University,Jinan 250061,China;School of Materials Science and Engineering,Shandong University,Jinan 250061,China;School of Transportation and Civil Engineering,Shandong Jiaotong University,Jinan 250357,China;National United Engineering Laboratory for Biomedical Material Modification,Dezhou,Shandong 251100,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2022年第4期620-628,共9页
Chinese Journal of Inorganic Chemistry
基金
山东省自然科学基金(No.ZR2017MEM014,ZR2020QE070)
山东省人力资源和社会保障厅博士后创新项目(No.202002050)
中国博士后科学基金资助项目(No.2019M652380)资助。
