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A Hybrid Consolidant of Nano-Hydroxyapatite and Silica Inspired from Patinas for Stone Conservation

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Advanced Materials for the Conservation of Stone

Abstract

A hybrid consolidant with high affinity to carbonaceous substrates was synthesized by adding synthesized nano-hydroxyapatite into TEOS sol, while for the first time, amylamine (CH3(CH2)4NH2) was used as a surfactant, providing an efficient means of protecting gels from cracking by reducing the capillary pressure. Amylamine is characterized by a short chain amine molecule, therefore, the amphiphilicity increased by the hydrophilic functional groups and hydrophobic tail groups without causing the formation of any amphiphilic molecule clusters. The hydroxyapatite was selected on the grounds of the weathering resistance often encountered in well-preserved monument surfaces (patinas) and attributed to the combination of hydroxyapatite, with calcium oxalate, and silica. The role of hydroxyapatite and amylamine in the silica structure was further examined by comparing the synthesized consolidant with other nanocomposites containing TEOS, TEOS and hydroxyapatite, and TEOS and amylamine as basic reagents. The synthesized products have been characterized and evaluated for their effectiveness as strengthening agents on limestone that is widely used in the historic and modern architectural structures in the Mediterranean basin. Generally, the nanocomposite-treated stone demonstrated an improvement in hygric properties, drilling resistance, and tensile strength due to the crack-free structure of the nanocomposite.

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Authors and Affiliations

  1. Lab of Materials for Cultural Heritage and Modern Building, School of Architecture, Technical University of Crete, Akrotiri campus, Chania, Crete, 73100, Greece

    Pagona Maravelaki & Anastasia Verganelaki

Authors
  1. Pagona Maravelaki
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  2. Anastasia Verganelaki
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Correspondence to Pagona Maravelaki .

Editor information

Editors and Affiliations

  1. Department of Manufacturing and Industrial Engineering, The University of Texas Rio Grande Valley, Edinburg, Texas, USA

    Majid Hosseini

  2. Department of Management and Conservation of Ecclesiastical Cultural Heritage Objects, University Ecclesiastical Academy of Thessaloniki, Thessaloniki, Greece

    Ioannis Karapanagiotis

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Maravelaki, P., Verganelaki, A. (2018). A Hybrid Consolidant of Nano-Hydroxyapatite and Silica Inspired from Patinas for Stone Conservation. In: Hosseini, M., Karapanagiotis, I. (eds) Advanced Materials for the Conservation of Stone. Springer, Cham. https://doi.org/10.1007/978-3-319-72260-3_4

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