Ion-Substituted Carbonated Hydroxyapatite Coatings for Model Stone Samples

Coatings

George-Ionut Radu¹  MadalinaElena Grigore¹  Mihaela-Lucia Ion¹  Lorena Iancu¹  Cristiana Radulescu¹  Sofia Teodorescu¹  RamonaElena Andrei²  AncaIrina Gheboianu²  RamonaMarina Grigorescu²  Rodica-Mariana Ion²  IoanAlin Bucurica²  Gabriel Vasilievici²  IoanaDaniela Dulama² 

[1] D Institute for Chemistry and Petrochemistry–ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania;;Research Group “Evaluation and Conservation of Cultural Heritage”, National R&

关键词: carbonated hydroxyapatite;    nanomaterials;    coatings;   

DOI  :  10.3390/coatings9040231

来源: DOAJ

【 摘 要 】

Carbonated hydroxyapatite derivatives (CHAp) and its metallic derivatives (Ag, Sr, Ba, K, Zn) have been prepared and characterized in this paper and their coating capacity on some model stone samples have been evaluated and discussed. These compounds were characterized by using several analytical tools, including X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), to determine the purity of the CHAp sample. The XRD and FTIR results confirmed the presence of AB-carbonated type CHAp. The thermal analysis (TGA) established two stages of weight loss that occured during the heating process: The first weight loss between 30–225 °C corresponding to the partial carbonate release from OH-channel and the second one between 226–700 °C, corresponding to some thermal reactions, possibly to the generation of calcium phosphate. The efficiency and suitability of these products on model stone samples were evaluated by monitoring the resistance to artificial weather (freeze–thaw), and pore structure changes (surface area, pore volume, pore diameter). Meanwhile, optical microscopy (OM) and Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM–EDS) techniques showed the particles size and surface morphology of the samples, as well as information on its chemical composition. Also, the compressive strength of these new compounds as coatings revealed a homogeneity and strengthen of these model stone samples.

【 授权许可】

Unknown