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Investigation of calcium carbonate precipitated in the presence of alkanols
Author(s) -
Fernandes M.,
Almeida Paz F. A.,
Mano J. F.,
Zea Bermudez V.
Publication year - 2014
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201400059
Subject(s) - chemistry , stoichiometry , alcohol , calcium carbonate , molar ratio , solvent , wetting , calcite , inorganic chemistry , carbonate , molar , ionic bonding , nuclear chemistry , mineralogy , chemical engineering , organic chemistry , catalysis , ion , medicine , dentistry , engineering
The influence of myristyl alcohol (CH 3 (CH 2 ) 13 OH), cetyl alcohol (CH 3 (CH 2 ) 15 OH) and behenyl alcohol (CH 3 (CH 2 ) 21 OH) on the structure, morphology, size and surface properties of calcium carbonate (CaCO 3 ) has been investigated. Changes in the nature of the washing solvent, in the C n OH/Ca 2+ and CO 3 2− /Ca 2+ molar ratios and in temperature have been also evaluated. The sole polymorph produced was rhombohedral calcite. At room temperature, while microspheres composed of submicrocubes were produced at a high molar ratio CO 3 2− /Ca 2+ and low CH 3 (CH 2 ) 15 OH concentration, a stoichiometric molar ratio CO 3 2− /Ca 2+ and high CH 3 (CH 2 ) 15 OH concentration induced the formation of microcubes and microboxes. In the presence of this alkanol (12 % molar) a significant enhancement of the water contact angle (ca. 40 °) resulted in a sample obtained with a stoichiometric CO 3 2− /Ca 2+ ratio. These results emphasize the key role played by the three non‐ionic surfactants in the formation of materials with variable crystal shape and wettability and thus technological interest for a range of applications.
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