An unusual datura pod structure for calcite-Effect of EGTA on the morphology and polymorphism of CaCO_3

摘要

Scale formation is a serious problem often observed in heat transfer equipments. Barite, calcite and aragonite are some of the major components of scale. Control of scale formation is usually achieved through usage of scale inhibitors/chelating agents. Here we report the effect of ethylene glycol-O,O'-bis(2-aminoethyl)-N,N,N',N'-tetraacetic acid (EGTA) on the morphology and polymorphism of CaCO3 when synthesized from CaCl2 solution using Na2CO3 at three different temperatures, 60, 80 and 100 degrees C. The samples were characterized using XRD, FTIR and SEM techniques. The details revealed that EGTA stabilizes aragonite more efficiently at 60 degrees C and with raise in temperature formation of calcite is predominant. The study revealed an unusual and novel datura pod like morphology for calcite.