Journal
POWDER TECHNOLOGY
Volume 205, Issue 1-3, Pages 263-269Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2010.09.026
Keywords
Nanoparticles; Calcium hydroxide; Calcium carbonate polymorphs; Relative humidity; Carbonation
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Funding
- Government of the Community of Madrid [S2009/MAT-1629, CSD2007-0058]
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A consolidating product based on nanoparticles of slaked lime (Ca(OH)(2)) dispersed in isopropyl alcohol was exposed under different relative humidities (RH), 33%, 54%, 75% and 90% during 7, 14, 21 and 28 days. The characterization of the calcium hydroxide nanoparticles and the formed calcium carbonate polymorphs have been performed by Micro Raman spectroscopy, Transmission Electron Microscopy (TEM), Environmental Scanning Electron Microscopy (ESEM) with Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Diffraction (XRD). Precipitation and transformation of calcium carbonate polymorphs strongly depend on the relative humidity (RH). Higher RH (75%-90% RH) gives rise to amorphous calcium carbonate and monohydrocalcite, calcite, aragonite and vaterite, faster carbonation and larger particles sizes with higher crystallinity compared to lower RH (33%-54% RH) that gives rise mainly to portlandite and vaterite, slower carbonation and smaller particle sizes with lower crystallinity. (C) 2010 Elsevier B.V. All rights reserved.
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