Wood preservation with gold hydroxyapatite system

Abstract

Over centuries, the external factors such as fire, low temperature, light or microbiological agents, act on the wood and induce some degradation processes, sometimes irreversible, identified by discoloration, fragility and unsightly appearance. Although there are numerous literature reports about different nanomaterials used for preservation and restoration of wood surfaces (calcium hydroxides, magnesium hydroxides, hydroxyapatite, or even organic resins as Paraloid B72), in this paper it is proposed a new system-gold hydroxyapatite (AuHAp), tested on the hazelnut wood samples (young and aged specimens), as a new solution for preservation of some wooden artifacts. This paper addresses a broad range of analytical methods: X-ray diffraction, UV-Vis spectrophotometry, Fourier transformed infrared spectroscopy, Raman spectroscopy, scanning electron microscopy with energy dispersive spectroscopy, chromatic parameters and hardness test. Also, humidity sorption/desorption measurements are used for humidity sorption and desorption evaluation. The adsorption and desorption tests determined the hydroscopic sorption properties of the wood specimens by measuring the mass of the specimens in equilibrium with air at a specific temperature and RH. All the results concluded that after the application of the new system on the hazelnut wood surface, a well distributed and uniform layer consisting from AuHAp systems with a network aspect are observed, which covers the wood vessels and fibers, filling the voids and stopping the wood weathering process, more accentuated at aged wood than at the young species.

Multi-Analytical Characterization of Corvins’ Castle—Deserted Tower. Construction Materials and Conservation Tests

“…By comparison with the compounds above-mentioned, the CHAp powder, previously prepared by our group, showed better homogeneity and a better consolidating effect, in spite of its higher solubility (0.0092 g/L) by comparison with HAp (0.0003 g/L) [49]. The mechanical properties of CHAp have been greatly improved by doping CHAp with different metal ions [47,54].…”

“…For potential applications in the preservation and restoration of cultural heritage objects, hydroxyapatite (HAp) has been used as a good consolidant agent for various types of artefacts: stone, paper, and wood [14,[45][46][47][48]. The selection of HAp as a potential material for the protection and consolidation of carbonate stones was based on its low solubility and slow dissolution rate [15,49].…”

Physico-Chemical Characterization of Wood Treated with Polymeric Systems

“…Also, an increase of b* chromatic parameter from 24.75 to 25.88 after irradiation was recorded. This change highlights a higher yellowness of wood sample due to UV radiation that can depolymerize the lignin and form o-and p-quinonoid structures [6,8].…”

Archaeometric Analyses on Precucuteni-Type Pottery From Transylvania (Romania). Case Study: Alba Iulia-Lumea Nouă

“…In the field of cultural heritage analyses, the analytical techniques applied in each study must be selected as a function of the sample nature, as well as the destructive or nondestructive character of the equipment. The most commonly used techniques in the study of the samples from cultural heritage are: scanning electron microscopy coupled with energy dispersive X-ray spectrometry (SEM-EDS) [10][11][12][13][14][15][16][17][18][19], X-ray fluorescence [13,16,17,20], Xray diffraction (XRD) [11][12][13]19], Raman spectroscopy [11-13, 16, 21-23], Fourier transform infrared spectroscopy (FTIR) [10-12, 14-16, 18, 19], X-ray photoelectron spectroscopy (XPS) [24,25], Auger electron spectroscopy [17,25], neutron diffraction [20,26], neutron tomography [13,27], neutron activation analysis (NAA) [20,26], and optical microscopy (OM) [12,13], as nondestructive or minimally invasive techniques. In this study, a combination of few techniques (i.e., OM, SEM-EDS, ATR-FTIR, and Raman spectroscopy) was applied to provide comprehensive information about the studied fragments.…”