Grafted nanocellulose and alkaline nanoparticles for the strengthening and deacidification of cellulosic artworks

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:576

Article

Xu, Q.^1,2  Poggi, G.^1,2  Resta, C.^1,2  Baglioni, M.^1,2  Baglioni, P.^1,2 

[1] Univ Florence, CSGI, Via Lastruccia 3, I-50019 Sesto Fiorentino, FI, Italy

[2] Univ Florence, Chem Dept, Via Lastruccia 3, I-50019 Sesto Fiorentino, FI, Italy

关键词: Nanocellulose;    Grafting;    Alkaline nanoparticles;    Deacidification;    Strengthening;    Paper;    Calcium carbonate;    Calcium hydroxide;    Cultural heritage conservation;   

DOI  :  10.1016/j.jcis.2020.05.018

来源: Elsevier

【 摘 要 】

Hypothesis: Strongly degraded cellulosic artworks usually need deacidification and consolidation. Alkaline nanoparticles are known to be effective in neutralizing the acidity, while cellulose nanocrystals have the potential to be used as compatible and effective strengthening agents. Experiments: We have grafted cellulose nanocrystals with oleic acid using a 1' 1 -carbonyldiimidazolemediated procedure, to increase their dispersibility in organic solvents, and synthesized Ca(OH)(2) or CaCO3 nanoparticles via a solvothermal process. Grafted nanocellulose and alkaline nanoparticles were used to prepare ethanol-based hybrids. Prior to the application, the physico-chemical properties of nanocellulose dispersions and hybrids were studied by rheology and small-angle X-ray scattering. Findings: Cellulose nanocrystals were effectively grafted and stably dispersed in ethanol. It was shown that the use of ethanol as a dispersing medium, and the addition of alkaline nanoparticles act in a synergistic way, increasing the interactions between grafted cellulose nanocrystals, leading to the formation of clusters. These dispersions are thixotropic, a behavior particularly appealing to conservation purposes, since they can be applied in the liquid state, or, when a more confined application is required, they can be applied in a gel-like state. As a result of the application, an improvement in the mechanical properties of paper and an increase of pH were obtained. (C) 2020 Elsevier Inc. All rights reserved.

【 授权许可】

Free