Nanoparticles of calcium hydroxide for wood deacidification: Decreasing the emissions of organic acid vapors in church organ environments
Artikel i vetenskaplig tidskrift, 2009

Acetic and formic acid vapors emitted from woodwork in historical organs are very important corrosive agents for lead pipes. These acids are slowly released from the wood both during playing and when the pipes are silent. To inhibit this emission process. the wood surface can be modified, by creating a protective layer with alkaline features. However, a coating of wood is not recommended since this could modify the appearance and create a layer not perfectly compatible with the substrate. For this reason, we propose to use some innovative nanotechnology that has been successfully applied for the deacidification of wood samples coming from the Vasa shipwreck. Application of calcium (or magnesium) hydroxide nanoparticles, with sizes ranging from 30-150 nm, allowed a homogeneous distribution of particles through the surface layer of wood simply by soaking (or spraying) it in a alcohohc (or mixed with less polar solvents) dispersion of nanoparticies. Nanoparticles do not modify the wood appearance and distribute randomly within the first layers of wood. The small size of particles accounts for the high reactivity with CO2 from the air, to give the alkaline reserve of carbonates that provide high efficacy in the neutralization of gaseous acids. The emission of volatile organic compounds (VOC) from the treated wood was determined by using an emission test cell, Field and Laboratory Emission Cell (FLEC). The results show that the emissions of acetic acid vapor from nanoparticles treated wood was very low (< 70 mu g/m(2) h) during the first 13 month. In contrast, untreated wood emitted high concentrations of acetic acid vapor (200-400 mu g/m(2) h). (C) 2009 Published by Elsevier Masson SAS.

ca(oh)(2)

VOC

de-acidification

cultural-heritage

Formic acid

restoration

vasa

acetic-acid

Acetic acid

Organ pipe

atmospheric corrosion

conservation

Corrosion

hydroxide

Wood deacidification

nanotechnologies

Calcium

shipwrecks

Nanoparticle

Författare

R. Giorgi

Universita degli Studi di Firenze

D. Chelazzi

Universita degli Studi di Firenze

E. Fratini

Universita degli Studi di Firenze

Sarka Langer

SP Technical Research Institute of Sweden

Annika Niklasson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

M. Rademar

SP Technical Research Institute of Sweden

Jan-Erik Svensson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

P. Baglioni

Universita degli Studi di Firenze

Journal of Cultural Heritage

1296-2074 (ISSN)

Vol. 10 206-213

Ämneskategorier

Oorganisk kemi

DOI

10.1016/j.culher.2008.06.012