Cohesion Gain Induced by Nanosilica Consolidants for Monumental Stone Restoration
| Autor: | Joanna Dziadkowiec, Hsiu-Wei Cheng, Michael Ludwig, Matea Ban, Timon Pascal Tausendpfund, Regine von Klitzing, Markus Mezger, Markus Valtiner |
|---|---|
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Langmuir |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.2c00486 |
| Popis: | Mineral nanoparticle suspensions with consolidating properties have been successfully applied in the restoration of weathered architectural surfaces. However, the design of these consolidants is usually stone-specific and based on trial and error, which prevents their robust operation for a wide range of highly heterogeneous monumental stone materials. In this work, we develop a facile and versatile method to systematically study the consolidating mechanisms in action using a surface forces apparatus (SFA) with real-time force sensing and an X-ray surface forces apparatus (X-SFA). We directly assess the mechanical tensile strength of nanosilica-treated single mineral contacts and show a sharp increase in their cohesion. The smallest used nanoparticles provide an order of magnitude stronger contacts. We further resolve the microstructures and forces acting during evaporation-driven, capillary-force-induced nanoparticle aggregation processes, highlighting the importance of the interactions between the nanoparticles and the confining mineral walls. Our novel SFA-based approach offers insight into nano- and microscale mechanisms of consolidating silica treatments, and it can aid the design of nanomaterials used in stone consolidation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|