Formation of thin calcium carbonate films with aragonite and vaterite forms coexisting with polyacrylic acids and chitosan membranes

Journal of Colloid and Interface Science
N WadaT Umegaki

Abstract

CaCO3 crystallization on a chitosan membrane was studied using diffusion of (NH4)2CO3 vapors into a CaCl2 solution containing differing added amounts of two polyacrylic acids (PAAs) with molecular weights of ca. 2.0 x 10(3) and ca. 4.5 x 10(4). The coexistence of PAA and the chitosan membranes produced thin CaCO3 island crystals, which developed into a continuous CaCO3 film on the membranes. Continuous CaCO3 films consisting of only aragonite formed on the chitosan membranes at the optimum amount of PAA. When the amount of PAA is not optimum, the polymorph of CaCO3 switches from aragonite to vaterite, and the morphology has a tendency to become an isolated island structure. The formation of the aragonite and vaterite island crystals and the appearance of a range of added PAA suitable for their formation are explained by the action of two parallel phenomena: (a) the high concentration of Ca2+ ions in the chitosan membrane vicinity is achieved by the interaction between the -COO- groups of PAA adsorbed by the -NH3+ groups of the chitosan membrane through an electrostatic force and free Ca2+ ions in the CaCl2 solution, which produces the high supersaturation with CaCO3 in the membrane vicinity during CO2 diffusion; (b) PAA, remain...Continue Reading

References

Mar 27, 1999·Journal of Colloid and Interface Science·N WadaT Umegaki
Dec 9, 2000·Journal of Colloid and Interface Science·N WadaT Umegaki

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Citations

Mar 19, 2013·Materials Science & Engineering. C, Materials for Biological Applications·Yufei MaXavier Bourrat
May 6, 2016·Scientific Reports·Ina RianasariRamesh Jagannathan
Sep 9, 2008·The Journal of Physical Chemistry. B·Ana P RamosMaria E D Zaniquelli
Feb 10, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Michael MaasMatthias Epple
Feb 18, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Yaodong WuZhengzhong Shao

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