PAH模板调控六棱片状碳酸铈形成机理的研究

以聚烯丙基氯化铵(PAH)为模板剂,(NH_4)_2CO_3为沉淀剂,采用液相法合成了特殊形貌的碳酸铈晶体.利用激光共聚焦显微镜、扫描电镜、红外光谱(FT-IR)及X射线衍射(XRD)等技术研究了不同反应时间碳酸铈形貌的变化,并对碳酸铈晶体的形貌和结构进行了表征.结果表明:在模板剂PAH的作用下,碳酸铈的形貌由最初的棒状逐渐向六棱片状转化,这一过程与PAH对碳酸铈晶体不同晶面的取向吸附有关.采用材料模拟软件Material Studio对PAH与碳酸铈晶面的静电吸附过程进行了模拟,从而揭示了PAH模板调控碳酸铈形貌的机理.

Study on Formation Mechanism of Hexagonal Flake Cerium Carbonate under the Regulation of PAH Template

Taking poly (vinyl chloride) (PAH) as a template agent, (NH4)2CO3 as a precipitant, cerium carbonate crystals of special morphology were synthesized by using a liquid phase method. The morphology of cerium carbonate with different reaction time and structure of cerium carbonate crystals were characterized by the techniques of laser confocal microscope, scanning electron microscope, Fourier transform infrared spectroscopy and X-ray diffraction. The results show that under the action of PAH, the morphology of cerium carbonate was gradually transformed into hexagonal flake from initial rodlike, and this process was related with the orientation adsorption of PAH to the different crystal faces of cerium carbonate. Meanwhile, the electrostatic adsorption process of PAH and crystal faces of the cerium carbonate materials were also simulated by material studio software, thus revealing the formation mechanism of PAH template regulated cerium carbonate morphology.