pH对EDTA包覆CaF_2纳米晶生长的调控  

Regulation of the EDTA capped-CaF_2 nanocrystals growth by pH

作　　者：王荷芳[1] 颜欢[1] 

机构地区：[1]南开大学化学学院分析科学研究中心,天津300071

出　　处：《实验室科学》2015年第1期40-42,共3页Laboratory Science

摘　　要：结合EDTA与Ca2＋络合反应和Ca2＋与F-沉淀反应,通过调节体系pH值,可实现对EDTA包覆CaF2纳米晶生长的调控。当pH大于7时,不能形成CaF2纳米晶,在pH为6~3时有CaF2纳米晶出现,且随着pH的降低,CaF2纳米晶的产量增加、粒径增大。但当pH降到2时EDTA会大量析出,对CaF2纳米晶的生长不起作用。Based on the complexation reaction between Ca2 ＋and EDTA and the precipitation reaction between Ca2 ＋and F-,the EDTA capped- CaF2 nanocrystals were successfully synthesized. The growth of Ca F2 nanocrystals was controlled by adjusting the acidity of the solution. When p H was above7,no CaF2 nanocrystals formed. CaF2 nanocrystals occurred when p H was between 6 and 3,and the increase of acidity lead to more and bigger CaF2 nanocrystals. However,when p H value decreased to2,EDTA heavily precipitated which did not help the growth of CaF2 nanocrystals.

关 键 词：络合反应 沉淀反应 纳米晶体 

分 类 号：O652.1[理学—分析化学]