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Electrospray Deposition of Cellulose Nanofibers on Paper: Overcoming the Limitations of Conventional Coating

While the potential of cellulose nanofibers to enhance the mechanical and barrier properties of paper is well-known, there are many uncertainties with respect to how to apply them. In this study, we use not only bulk addition of micro-/nanofibers and bar coating with oxidized nanofibers, but also a...

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Autores principales: Tarrés, Quim, Aguado, Roberto, Pèlach, M. Àngels, Mutjé, Pere, Delgado-Aguilar, Marc
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8746688/
https://www.ncbi.nlm.nih.gov/pubmed/35010029
http://dx.doi.org/10.3390/nano12010079
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author Tarrés, Quim
Aguado, Roberto
Pèlach, M. Àngels
Mutjé, Pere
Delgado-Aguilar, Marc
author_facet Tarrés, Quim
Aguado, Roberto
Pèlach, M. Àngels
Mutjé, Pere
Delgado-Aguilar, Marc
author_sort Tarrés, Quim
collection PubMed
description While the potential of cellulose nanofibers to enhance the mechanical and barrier properties of paper is well-known, there are many uncertainties with respect to how to apply them. In this study, we use not only bulk addition of micro-/nanofibers and bar coating with oxidized nanofibers, but also a combination of these and, as a novel element, electrospray deposition of nanofiber dispersions. Characterization involved testing the strength of uncoated and coated paper sheets, their resistance to air flow, their Bendtsen roughness, and their apparent density, plus visualization of their surface and cross-sections by scanning electron microscopy. As expected, bulk addition to the unrefined pulp was sufficient to attain substantial strengthening, but this enhancement was limited to approximately 124%. Following this, surface addition by bar coating improved air resistance, but not strength, since, as applying nanocellulose at high consistency was technically unfeasible, this was performed several times with detrimental drying stages in between. However, replacing bar coating with electrospraying helped us overcome these apparent limitations, producing enhancements in both barrier and tensile properties. It is concluded that electrosprayed nanofibers, owing to their uniform deposition and favorable interactions, operate as an effective binder between fibers (and/or fines).
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spelling pubmed-87466882022-01-11 Electrospray Deposition of Cellulose Nanofibers on Paper: Overcoming the Limitations of Conventional Coating Tarrés, Quim Aguado, Roberto Pèlach, M. Àngels Mutjé, Pere Delgado-Aguilar, Marc Nanomaterials (Basel) Article While the potential of cellulose nanofibers to enhance the mechanical and barrier properties of paper is well-known, there are many uncertainties with respect to how to apply them. In this study, we use not only bulk addition of micro-/nanofibers and bar coating with oxidized nanofibers, but also a combination of these and, as a novel element, electrospray deposition of nanofiber dispersions. Characterization involved testing the strength of uncoated and coated paper sheets, their resistance to air flow, their Bendtsen roughness, and their apparent density, plus visualization of their surface and cross-sections by scanning electron microscopy. As expected, bulk addition to the unrefined pulp was sufficient to attain substantial strengthening, but this enhancement was limited to approximately 124%. Following this, surface addition by bar coating improved air resistance, but not strength, since, as applying nanocellulose at high consistency was technically unfeasible, this was performed several times with detrimental drying stages in between. However, replacing bar coating with electrospraying helped us overcome these apparent limitations, producing enhancements in both barrier and tensile properties. It is concluded that electrosprayed nanofibers, owing to their uniform deposition and favorable interactions, operate as an effective binder between fibers (and/or fines). MDPI 2021-12-29 /pmc/articles/PMC8746688/ /pubmed/35010029 http://dx.doi.org/10.3390/nano12010079 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Tarrés, Quim
Aguado, Roberto
Pèlach, M. Àngels
Mutjé, Pere
Delgado-Aguilar, Marc
Electrospray Deposition of Cellulose Nanofibers on Paper: Overcoming the Limitations of Conventional Coating
title Electrospray Deposition of Cellulose Nanofibers on Paper: Overcoming the Limitations of Conventional Coating
title_full Electrospray Deposition of Cellulose Nanofibers on Paper: Overcoming the Limitations of Conventional Coating
title_fullStr Electrospray Deposition of Cellulose Nanofibers on Paper: Overcoming the Limitations of Conventional Coating
title_full_unstemmed Electrospray Deposition of Cellulose Nanofibers on Paper: Overcoming the Limitations of Conventional Coating
title_short Electrospray Deposition of Cellulose Nanofibers on Paper: Overcoming the Limitations of Conventional Coating
title_sort electrospray deposition of cellulose nanofibers on paper: overcoming the limitations of conventional coating
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8746688/
https://www.ncbi.nlm.nih.gov/pubmed/35010029
http://dx.doi.org/10.3390/nano12010079
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