聚烯丙基氯化铵调控合成碳酸铈粒子的作用机理探讨  

Study on Mechanism of Polyallylamine Hydrochloride Controlled Synthesis of Cerium Carbonate Particles

作　　者：胡艳宏[1] 张遥[1] 李梅[1] 柳召刚[1] 王觅堂[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古自治区高效稀土现代冶金新技术与应用重点实验室,内蒙古包头014010

出　　处：《稀土》2015年第2期9-14,共6页Chinese Rare Earths

基　　金：国家杰出青年基金项目(51025416);教育部长江学者和创新团队发展计划创新团队项目(IRT1065);国家自然科学基金项目(201066010);内蒙古自然科学基金项目(2012MS0206)

摘　　要：聚烯丙基氯化铵(PAH)作为聚电解质自组装膜,被用于调控碳酸铈颗粒形貌及大小。通过IR分析,PAH与Ce3+配位发生sp2杂化,形成π-烯丙基络合物,同时,PAH中的N原子与Ce原子也络合成键,此络合物以三聚体形式存在,诱导晶核的形成,由于PAH带电,通过静电作用、晶格几何匹配和立体化学互补,使得晶体定向生长,最终合成由六棱片状组成的花瓣状Ce2(CO3)3。XRD、SEM、TEM分析表明,PAH对晶体(160)、(022)面都是抑制作用,(242)面为促进生长,(202)晶面基本不变,确定Ce2(CO3)3晶体定向生长趋势。Polyallylamine hydrochloride（PAH） as self - assembled polyelectrolyte membrane was used for the morphology and size control of cerium carbonate particles. IR analysis showed that sp^2 hybridization was took place and π- allyl complex was formed between PAH and Ce^3＋ ions. At the same time, N atoms and Ce atoms of PAH were reacted to form complex existing in tripolymer which induced nucleation. Electrostatic interaction, lattice geometrical matching and stereochemistry comple- mentarity caused the directional crystal growth and petal shaped Ce2 （ CO3 ） 3 crystal were formed by accumulation of hexagon - like flake. XRD, SEM, TEM analysis showed that the crystal growth was inhibited at face（160） and （022） and promoted at face （242） by PAH, and the growth at face （202） did not affected by PAH.

关 键 词：聚烯丙基氯化铵(PAH) 碳酸铈 络合 机理 

分 类 号：TF123.25[冶金工程—粉末冶金] TQ133.3[冶金工程—冶金物理化学]