Deacidification of paper using dispersions of Ca(OH)2 nanoparticles in isopropanol. Study of efficiency |
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| Authors: | S Sequeira C Casanova EJ Cabrita |
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| Institution: | aDep. de Conservação e Restauro, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;bInstituto de Investigação Científica Tropical, R. da Junqueira, 86-1° 1300-344 Lisboa, Portugal;cREQUIMTE/CQFB, Dep. de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal |
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| Abstract: | The efficiency of a recently described non-aqueous method for paper deacidification using Ca(OH)2 nanoparticles in isopropanol was evaluated by pH and colorimetric measurements and by the analysis of the degree of polymerization (DP). Samples of plain paper and paper with iron gall ink were tested. The results were compared with non treated samples and samples submitted to the traditional treatment with saturated aqueous Ca(OH)2 solution. By comparing the two conservation methods, the aqueous one shows higher neutralization reaction kinetics than the non-aqueous one. The iron gall ink samples maintain their coloration closer to the original after the non-aqueous Ca(OH)2 nanoparticles treatment, in contrary to the aqueous treatment that changes the ink aesthetics considerably. Artificial aging tests revealed a general increase in the aging stability of deacidified paper samples. The Ca(OH)2 nanoparticles treatment can be an alternative for papers who can not be treated by the classical aqueous treatment, e.g. papers with water soluble components. |
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| Keywords: | Paper Nanoparticles Calcium hydroxide (Ca(OH)2) Deacidification Iron gall ink |
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