Cellulose nanocrystal-based composite for restoration of lacunae on damaged documents and artworks on paper

Camargos, Camilla H. M.; Figueiredo, João Cura D. 'Ars de; Pereira, Fabiano Vargas

doi:10.1016/j.culher.2016.10.007

Cited by 22 publications

(12 citation statements)

References 7 publications

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“…Currently, these nanostructures are applied in numerous multifunctional materials, comprising nanocomposites, − films, foams, and membranes . Additionally, nanocelluloses and nanoligninsalone or combined with other organic or inorganic specieshave often been separately applied as consolidants or coatings on polymeric packaging and wood, − paper, − and fabric − substrates.…”

Section: Introductionmentioning

confidence: 99%

Protective Coatings Based on Cellulose Nanofibrils, Cellulose Nanocrystals, and Lignin Nanoparticles for the Conservation of Cellulosic Artifacts

Camargos

Poggi

Chelazzi

et al. 2022

ACS Appl. Nano Mater.

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Green nanocomposites combining cellulose nanofibrils (CNFs), cellulose nanocrystals (CNCs), and lignin nanoparticles (LNPs) were designed and applied for the first time as ternary protective coatings on cellulosic materials, i.e., substrates mainly composed of cellulose. All the nanostructures were obtained from elephant grass biomass. CNFs and CNCs are less than 10 nm thick and present a filament-like morphology, while LNPs are spheres with an average diameter of less than 100 nm. The use of water-based nanoparticle dispersions is a facile and greener alternative to synthetic varnishes usually based on toxic organic solvents. Moreover, the coatings from renewable sources were chemically stable; showed high compatibility with wood, paper, and fabric; and preserved the roughness and surface morphology of the substrates after application. Moist-heat accelerated aging and UV-shielding assays revealed that the nanocellulose/nanolignin coatings were able to protect the coated cellulosic substrates against degradation. The wettability of nanocomposite-coated substrates could be tailored and reduced to produce hydrophobic surfaces by applying additional layers of water-based carnauba wax nanoparticles, which are also sustainable. Additionally, two-dimensional infrared spectroscopy mapping confirmed the reversibility of the coating application, as the nanocomposite layers could be easily removed from the cellulosic substrates by water-loaded cleaning hydrogels. Therefore, the functional protective coating introduced here represents an environmentally friendly and nontoxic approach for the conservation of cellulosic artifacts in general, including cultural heritage objects based on paper, wood, and fabric.

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Section: Introductionmentioning

confidence: 99%

Protective Coatings Based on Cellulose Nanofibrils, Cellulose Nanocrystals, and Lignin Nanoparticles for the Conservation of Cellulosic Artifacts

Camargos

Poggi

Chelazzi

et al. 2022

ACS Appl. Nano Mater.

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“…Combining leaf and stem CNFs to produce thin films was proven to increase tensile strength and stiffness as compared to single-component films. Therefore, controlling nanocellulose structural features by implementing different production methods on different parts of lignocellulosic precursors could be a handy strategy for designing sustainable building blocks for a variety of applications, including nanocomposites, , all-nanocellulose thin films, coatings, lightweight 3D networks, and other advanced materials.…”

Section: Introductionmentioning

confidence: 99%

Structure–Property Relationships of Cellulose Nanocrystals and Nanofibrils: Implications for the Design and Performance of Nanocomposites and All-Nanocellulose Systems

Camargos

Rezende

2021

ACS Appl. Nano Mater.

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Cellulose nanocrystals (CNCs) and nanofibrils (CNFs) are sustainable candidates for designing nanocomposites and all-nanocellulose systems for a myriad of advanced applications, such as protective coatings, packaging materials, and hydrogels. The role of nanocellulose in such different applications is mainly determined by its morphological and physicochemical properties. Although these properties have been studied at length by a consistent and growing number of publications, there is still a lack of a comprehensive study of the relationships between structure, properties, and functions of different nanocelluloses. Here, we thoroughly investigated the combined effect of distinct production methods and anatomical origins of non-wood cellulose on the structure−property relationships of CNCs and CNFs. These nanoparticles were obtained by the most established production approaches, that is, sulfuric acid hydrolysis or TEMPO-mediated oxidation/fibrillation of elephant grass leaves or stems, that is, two different parts of a unique biosource. We were able to prepare CNCs and CNFs with modulated morphological features and degrees of polymerization, which implied major effects on the mechanical and rheological behaviors of nanocellulose films and dispersions, respectively. Additionally, tailoring lignin and ionizable group contents as well as the color, transparency, and stability of nanocellulose dispersions could provide important implications for the shelf life of nanocellulose formulations, as well as for their application as nanocomposite additives with UV-protection and antioxidant abilities. Therefore, the assembly of results presented here can work as a tool to guide decision-making for both (1) the selection of methods and/or plant anatomical parts to produce nanocelluloses with tailored properties and (2) the prospects of combining different cellulose nanostructures to design advanced materials.

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“…Paper, recording a considerable number of historical information, has gone through for about 2 thousand years. It indicates that archives and libraries worldwide currently have nearly 2.5 million km of paper works for storage [1][2][3][4][5][6]. After hundreds of years of preservation, a large number of works on paper become weak and brittle.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of Polyurethane Coating Material Based on Epoxy Cyclohexane Protective for Paper

Liu

Jin

et al. 2021

Coatings

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Paper is important to most historical and cultural relics, however, these paper heritages are facing a crisis of disappearance, damage and aging. For increasing the paper strength, delaying the paper aging, and improving the weak stability and permeability of former resins used for paper, another material is necessary to be produced on preservation and protection of the paper items. The synthesis of epoxy cyclohexane polyetherpolyol was as follows: Epoxy cyclohexane was as the starting material, ethylene glycol was as the initiator, boron trifluoride ether was as catalyst, and dichloromethane was as the solvent. The synthesized homopolyether was characterized by infrared (IR) spectroscopy and proton nuclear magnetic resonance (1HNMR) spectroscopy to determine the structure. Then the epoxy cyclohexane homopolyether reacted with the hexamethylene diisocyanate (HDI) trimer, and the polyurethane was obtained. With the tests of the physical and chemical properties of paper samples, it showed that the paper processed with 10% polyurethane liquid had excellent performance, the increase in the tensile strength was from 1105 to 2317 N/m, and the increase in the folding endurance was from 20 to 504 times. What’s more, the paper processed with 10% polyurethane liquid had good brightness and gloss. The results of the paper samples for the test have shown that the synthesized material simultaneously has the advantages of epoxy cyclohexane homopolyether and polyurethane, possessing excellent performance in paper reinforcement. Thus, the synthesized polyurethane material has broad application prospect in paper protection field.

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Cellulose nanocrystal-based composite for restoration of lacunae on damaged documents and artworks on paper

Cited by 22 publications

References 7 publications

Protective Coatings Based on Cellulose Nanofibrils, Cellulose Nanocrystals, and Lignin Nanoparticles for the Conservation of Cellulosic Artifacts

Protective Coatings Based on Cellulose Nanofibrils, Cellulose Nanocrystals, and Lignin Nanoparticles for the Conservation of Cellulosic Artifacts

Structure–Property Relationships of Cellulose Nanocrystals and Nanofibrils: Implications for the Design and Performance of Nanocomposites and All-Nanocellulose Systems

Preparation and Application of Polyurethane Coating Material Based on Epoxy Cyclohexane Protective for Paper

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