Ca(OH)2 Nanoparticle Characterization:
Microscopic Investigation Of Their Application
On Natural Stones
Author(s)
V. Daniele & G. Taglieri
Abstract
Owing to conversion of lime into calcium carbonate, lime is usually adopted for
conservative surface treatments. However, some critical aspects concerning the
treatments reduced penetration depth, the binder concentration and the
incomplete lime carbonation process still represent undesired limits and
hindrances. In order to improve lime treatments, Ca(OH)2 particles with
nanometric dimensions (nanolime) have recently been introduced in Cultural
Heritage conservation (frescoes, stuccoes, ..). The aim of the present work is to
characterize Ca(OH)2 nanoparticles synthesized by a chemical precipitation
process starting from two base supersaturated aqueous solutions of calcium
chloride and sodium hydroxide. After several washes, necessary to remove the
sodium chloride, the aqueous medium is partially substituted by 2-propanol to
improve the suspension stability; an alcoholic nanolime suspension is obtained,
characterised by a given concentration and a residual water content. In order to
identify the structure of the formed phases and the particles reactivity, the
obtained nanolime is characterised by X-ray diffraction (XRD) and profile
analysis; scanning and transmission electron microscopy (SEM-TEM) are
performed too. The results show hexagonally plated and regularly shaped
particles with side dimensions equal to or less than 300nm; moreover particles
have pure crystalline features and a high reactivity in terms of the carbonation
process. Finally, the Ca(OH)2 nanoparticles are applied on some natural
lithotypes; SEM analyses are performed to evaluate penetration depth and grain
adhesion of the nanolime treatments itself. From SEM micrographs a partial
filling of the lithotypes pores, located at a distance from the surface of more than
200μm, is observed.
Keywords: calcium hydroxide, consolidation, lime, nanoparticles, protection.
Keywords
calcium hydroxide, consolidation, lime, nanoparticles, protection
Related Book
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