A novel morphology of aragonite and an abnormal polymorph transformation from calcite to aragonite with PAM and CTAB as additives.
The abnormal structure conversion of CaCO3 from calcite to aragonite was investigated with a mixture of polyacrylamide (PAM) and cetyltrimethylammonium bromide (CTAB) as additives by a hydrothermal method. A novel morphology of aragonite, "magnified" cubic shape, was observed. In order to investigate the effects of PAM and experimental temperature on the morphology and phase of CaCO3, the samples were synthesized without any additives and with PAM as template at 90 and 120 degrees C, respectively. The results indicate that both the interaction between the mixed template and the CaCO3 and the elevated experiment temperature play important roles in the process of polymorph transformation.
Nan
Zhaodong
Z
College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, People's Republic of China. zdnan@yzu.edu.cn
Shi
Zuoyi
Z
Yan
Bianqing
B
Guo
Rong
R
Hou
Wanguo
W
D000180:Acrylic Resins / Q000737:chemistry*; D002119:Calcium Carbonate / Q000737:chemistry*; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D003460:Crystallization; D010316:Particle Size; D013499:Surface Properties; D000099166:Polyacrylamides
D000180:Acrylic Resins; D002119:Calcium Carbonate; D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D000099166:Polyacrylamides