Comparative Evaluation of the Morphological Characteristics of Nanolime Dispersions for the Consolidation of Architectural Monuments

Historic Mortars and New Repair Materials for the Architectural Heritage: Selected Papers from the 5th Historic Mortars Conference (HMC 2019)

“…The techniques and materials for consolidation of the mortars is another topic that has been considered. Michalopoulou et al (2020) pursue in their article the achievement of this objective by using nanotechnology. The study focuses on four different nanolime dispersions to be used for consolidation of stones and mortars.…”

Ανάπτυξη Νανο-Σύνθετων Υλικών Με Βάση Το Ασβέστιο Για Την Ενίσχυση Των Πορωδών Υλικών Δόμησης Σε Αρχιτεκτονικά Μνημεία Και Παραδοσιακές Κατασκευές

“…nanobubbles [146], [222]. Because of this interface, gas-water, charging the gaseous cavities (in our case O2) can be formatted and remained into the water phase as bulk NBs [223][224].…”

“…5.1), thus imitating the morphology of the material deposited inside the pore matrix of the building materials during consolidation. Therefore, the morphological characteristics observed in SEM are related to the characteristics of the dispersion medium used each time and the surface tension between the surfactant/dispersion-medium/nanoparticles system during the evaporation of the liquid phase [146]. Therefore, the characterization of dispersions presented in the following chapters encompasses the size of the hexagonal portlandite crystallites based on the XRD results, the morphology of the nanoparticles in TEM and the morphology of the clusters of the nanoparticles in SEM, after evaporation of the dispersion medium.…”

“…They are consisted of a lyophobic group and a lyophilic group that interact in different ways with the dispersion medium. They present the ability to be adsorbed onto the surfaces, thus, modifying the surface energy between two immiscible phases [4], [146]. The characteristic molecular structure of the surfactants is responsible for their ability to be adsorbed onto the interfaces, to enhance the solubilization of hydrophobic materials and to form self-assembled particles.…”

“…through their adsorbent and re-nucleation of the surface of the nanoparticles, forming a steric barrier and thus, inhibit the aggregation of the nanoparticles [146]. Finally, among the short-chain aliphatic alcohols, 2-propanol presents the lowest surface tension and higher boiling point.…”