Synthesis, Textural and Structural Properties of Calcium Hydroxide Nanoparticles in Hydro-Alcoholic Suspension

Abstract

The use of calcium hydroxide nanoparticles (nanolime) in hydro-alcoholic suspensions represents a good enhancement in particular in the conservation of stones and surfaces of interest in Cultural Heritage. In this work we have produced nanolime by using our alternative method of synthesis (based on the use of a surfactant agent in the original solution) and we have studied, for the first time, structural and morphological properties of the synthesized nanoparticles directly in hydroalcoholic suspension by synchrotron X-ray diffraction technique and transmission electron microscope observations. The particles characterization was performed on suspensions synthesized by varying surfactant content in the synthesis procedure and the water/alcohol ratio, too. We have found that only pure and crystalline Ca(OH)2 particles produced during the synthesis procedure and they maintained stably in suspension. These particles were hexagonally plated and regularly shaped with side dimension ranging from 300 to 40 nm or less; they had a platy habit and they presented, particularly with high alcohol content in suspension, a preferred orientation along z-axis.

Synthesis of Nano Calcium Hydroxide in Aqueous Medium

“…The first generic feature is the inevitable presence of the carbonation process irrespective of whether a surfactant and/or an airtight container are used . The carbonation process almost invariably happens independent of whether nonaqueous or nonaqueous along with aqueous or an aqueous medium is utilized. The almost generic presence of calcium hydroxide and calcium carbonate phases is a consequence of the carbonation process and definitely does not happen as events independent of the carbonation process .…”

“…The carbonation process almost invariably happens independent of whether nonaqueous or nonaqueous along with aqueous or an aqueous medium is utilized. The almost generic presence of calcium hydroxide and calcium carbonate phases is a consequence of the carbonation process and definitely does not happen as events independent of the carbonation process . So far, in literature, there is no detailed report on XRD‐based quantitative as well as electron microscopy‐based structural analysis of the calcium hydroxide and calcium carbonate phases.…”

“…Further, almost all the synthesis attempts involved utilization of one or the other organic medium in general . The additional presence of an aqueous medium is also reported. There is only a singular attempt to synthesize CHNPs in completely aqueous medium .…”

A Study of Hybrid Composite Hydroxyapatite (HA)-Geopolymers as a Material for Biomedical Application

“…The metakaolin particles (5a) appear to retain the flake shape of kaolinite crystallinity. The morphology of HA particles tend to form a hexagonal shape with a size between 5 -10 µm similar to that reported in [12,13,14]. HA tends to form agglomerates with an average size of crystals in the range of 15-50 nm [15] as well as irregular morphology [16].…”

Performance evaluation of commercial nanolime as a consolidant for friable lime-based plaster

“…Although various synthesizing methods of nanolime have been designed since (Giorgi et al, 2000;Salvadori and Dei, 2001;Nanni and Dei, 2003;Rodgriguez-Navarro et al, 2005;Ciliberto et al, 2008;Daniele et al, 2008;Liu et al, 2010;Nasillo et al, 2011;Daniele and Taglieri, 2012;Taglieri et al, 2013;Rodgriguez-Navarro et al, 2013;Poggi et al, 2014;Taglieri et al, 2014;Taglieri et al, 2015), researchers agree there are two basic methods for producing nanolime particles. One mechanically breaking the calcium hydroxide particles into nanoscale particles, while the other produces nanolime using a homogeneous phase or heterogeneous phase synthesizing method (Rodriguez-Navarro et al, 2013).…”