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vol.53 número2SYNTHESIS, CHARACTERIZATION AND CATALYTIC BEHAVIOR OF THE Ir/Nb(2)0(5)/Si0(2) SYSTEM IN THE CITRONELLAL HYDROGENATIONINCLUSION COMPOUNDS OF α-CYCLODEXTRIN WITH ALKYLTHIOLS índice de autoresíndice de assuntospesquisa de artigos
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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

NEIRA-CARRILLO, ANDRÓNICO et al. CALCIUM CARBONATE GROWTH MODIFICATION BY CONSTITUENTS RELEASES FROM POROUS CELLULOSE FILTER MEMBRANES. J. Chil. Chem. Soc. [online]. 2008, vol.53, n.2, pp.1469-1473. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072008000200004.

Filtration of a suspension of calcium carbonate (CaC03) or other inorganic solutions are often part of the methodology for recovering crystals during biomimetic mineralization experiments performed by various procedures. However, the use of cellulose filter membranes (FM) may cause a problem in in vitro crystallization experiments, because constituents released from the filters into the filtrates can alter the morphology of CaC03 crystals. Therefore, it is possible to misinterpret data obtained when the effect of specific additives tested in the investigation of biomineralization mechanisms. Herein, we present essential information to avoid such misinterpretations of data obtained from mineralization experiments. CaC03 was precipitated at room temperature by the gas diffusion method in the presence of FM as support and particularly as filtrates of calcium chloride (CaCl2) obtained from various commercial FM. The occurrence or absence of morphological modifications of the calcite and vaterite crystals obtained with different FM correlates well with the different elemental compositions of the solutions where crystals are grown because of the constituents released from the filters into the filtrate. X-ray photoelectron spectroscopy (XPS) data indicate significant differences in the filter elemental composition. We assume that the observed chronological changes in CaC03 crystal modification could be due to incorporation into the calcite lattice of constituents released from the FM, most likely monomers, oligomers, or short-chain polymers.

Palavras-chave : Filter membranes (FM); Gas diffusion; X-ray photoelectron spectroscopy (XPS); calcite.

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