Deacidification of paper using dispersions of Ca(OH)2 nanoparticles in isopropanol. Study of efficiency

Deacidification of Acidic Books and Paper by Means of Non-aqueous Dispersions of Alkaline Particles: A Review Focusing on Completeness of the Reaction

“…Some of the earliest non-aqueous treatments were done with methanol, which did not completely avoid ink solubilization and also is quite flammable (Baynes-Cope 1969). Sequeira et al (2006) describe more recent work employing isopropanol. Another desirable attribute of a liquid medium for deacidification is that the fluid ought to completely wet the paper with a near-zero contact angle such that it can readily penetrate small pores in the material.…”

“…nanoparticles. Thus, it has been proposed to deacidify paper by addition of nano-sized Ca(OH)2 (Giorgi et al 2002;Sequeira et al 2006;Stefanis and Panayiotou 2007), or Mg(OH)2 (Giorgi et al 2005;Stefanis and Panayiotou 2007;Giorgi 2015;Amornkitbamrung et al 2015;Wojciak 2015). More research is needed to follow up in this area.…”

“…By contrast, very little change could be detected if the sodium bicarbonate and the acidulent were stored separately under similar conditions. Sequeira et al (2006) studied the possibility of distributing Ca(OH)2 particles in an isopropanol medium as a means of deacidifying paper that had been printed with iron gall ink, which is highly acidic. The non-aqueous treatment promoted the stability of the paper, as measured by accelerated aging tests.…”

A stabilizer-free non-polar dispersion for the deacidification of contemporary art on paper

“…Since then, research efforts have been devoted to the refinement of synthetic procedures, with the aim of tailoring physico-chemical particles characteristics to different case studies, including paper [13,16,17], iron gall inked manuscripts [18,19] and archeological wood [21,22]. The efficacy of these systems in hampering cellulose degradation has been assessed in several studies [37][38][39][40]. Recent updates about calcium hydroxide for deacidification purposes include the preparation of nanoparticles from calcium metal and n-propanol, using a solvothermal process [17].…”

Nanotechnologies in Cultural Heritage - Materials and Instruments for Diagnosis and Treatment

“…After a long period of exposure to environmental conditions (e.g., temperature, humidity, light), these substances accelerate chemical degradation of the paper. The global effect is the rapid decrease in the resistance to degradation of paper documents, especially on paper made since the eighteenth century [41][42][43]. There is a general consensus on the inevitable treatment of deacidification in paper preservation.…”