SrCO
3 particles were prepared by CO
2 bubbling into a solubilization system of aqueous Sr(OH)
2 in a cyclohexane solution of hexaoxyethyleneglycol dodecyl ether (DP-6) or polyoxyethylene (6) nonyl-phenyl ether (NP-6). In the both surfactant systems, the shape of particles were changed with the solubilization behavior of aqueous Sr(OH)
2. In the DP-6 system, rod and spindlelike particles were formed in the colorless and the blue teranslucent regions, respectively. In the NP-6 systems, on the other hand, spindlelike particles were formed in the colorless region while dendritelike particles were found in the blue translucent region. The size of the spindlelike particles was almost independent of the amount of added aqueous Sr(OH)
2 in the both systems. However, it increased with increasing concentration of the surfactants. The effect of the concentration of aqueous Sr(OH)
2 on the shape charge of particles was explained by the salting out effect of Sr(OH)
2.
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