Publikationen

Cohesion Gain Induced by Nanosilica Consolidants for Monumental Stone Restoration

Autor(en)
Joanna Dziadkowiec, Hsiu-Wei Cheng, Michael Ludwig, Matea Ban, Timon Pascal Tausendpfund, Regine von Klitzing, Markus Mezger, Markus Valtiner
Abstrakt

Mineral nanoparticle suspensions with consolidat-ing properties have been successfully applied in the restoration ofweathered architectural surfaces. However, the design of theseconsolidants is usually stone-specific and based on trial and error,which prevents their robust operation for a wide range of highlyheterogeneous monumental stone materials. In this work, wedevelop a facile and versatile method to systematically study theconsolidating mechanisms in action using a surface forcesapparatus (SFA) with real-time force sensing and an X-ray surfaceforces apparatus (X-SFA). We directly assess the mechanicaltensile strength of nanosilica-treated single mineral contacts andshow a sharp increase in their cohesion. The smallest usednanoparticles provide an order of magnitude stronger contacts. We further resolve the microstructures and forces acting duringevaporation-driven, capillary-force-induced nanoparticle aggregation processes, highlighting the importance of the interactionsbetween the nanoparticles and the confining mineral walls. Our novel SFA-based approach offers insight into nano- and microscalemechanisms of consolidating silica treatments, and it can aid the design of nanomaterials used in stone consolidation.

Organisation(en)
Dynamik Kondensierter Systeme
Externe Organisation(en)
Technische Universität Wien, University of Oslo (UiO), Technische Universität Darmstadt, Universität Stuttgart, Max-Planck-Institut für Polymerforschung
Journal
Langmuir
Band
38
Seiten
6949-6958
Anzahl der Seiten
10
ISSN
0743-7463
DOI
https://doi.org/10.1021/acs.langmuir.2c00486
Publikationsdatum
06-2022
Peer-reviewed
Ja
ÖFOS 2012
103015 Kondensierte Materie
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/cohesion-gain-induced-by-nanosilica-consolidants-for-monumental-stone-restoration(ecd705a9-6725-4494-85e2-a24320037527).html