Drying stresses in cellulose nanocrystal coatings: Impact of molecular and macromolecular additives

Klockars, Konrad W.; Greca, Luiz G.; Majoinen, Johanna; Mihhels, Karl; Rojas, Orlando J.; Tardy, Blaise L.

doi:10.1016/j.carbpol.2022.120465

Cited by 7 publications

(7 citation statements)

References 61 publications

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“…It has recently been demonstrated by Orlando, Tardy et al that the addition of plasticizers reduces the built-in stresses in nanopapers from cellulose nanocrystals . In the present case, the influence of the plasticizer will be more complicated, as it will affect both the interaction between the fibers during drying and the shrinkage of the fiber wall when water is removed.…”

Section: Resultsmentioning

confidence: 81%

“…It has recently been demonstrated by Orlando, Tardy et al that the addition of plasticizers reduces the built-in stresses in nanopapers from cellulose nanocrystals. 32 In the present case, the influence of the plasticizer will be more complicated, as it will affect both the interaction between the fibers during drying and the shrinkage of the fiber wall when water is removed. Since the glycerol remains in the paper after water removal, it will allow for movement of the layers within the fiber wall and maybe also allow relative motion between the fibers in the fiber−fiber joints.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

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Highly Ductile Cellulose-Rich Papers Obtained by Ultrasonication-Assisted Incorporation of Low Molecular Weight Plasticizers

Eliasson

Hedenqvist

Brolin

et al. 2023

ACS Sustainable Chem. Eng.

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Fiber-based materials are attractive sustainable alternatives to fossil-based plastics, however, the lack of ductility (i.e., brittleness) limits their applicability in complex shapes as are often utilized for plastics. In this study, we hypothesize that it is possible to enhance the ductility of a cellulose-rich material by the incorporation of low molecular weight plasticizers (glycerol, urea, citric acid, and tannic acid). However, no significant effects could be observed after swelling in the presence of plasticizers. To enhance any potential effect, it was decided to employ ultrasonication to mechanically disintegrate the fiber and aid the sorption of plasticizer prior to formation of sheets from the treated fibers. Glycerol or urea in combination with ultrasonication resulted in both internal and external fibrillation of the fibers, and it could be observed that the resulting fines create a film at the surface of the fibers in the formed sheets. Tensile testing shows that this gives rise to a 100% increase in ductility compared to sheets from untreated fibers. The use of citric or tannic acid has the opposite effect, reducing ductility to a third of that of the reference sheet. This is suggested to be due to the formation of covalent cross-links in the treated fibers, which also leads to different internal and external fibrillation mechanisms, as observed by scanning electron microscopy. The exceptionally high improvement of the strain-at-break for sheets from the glycerol-and urea-treated fibers suggests that low molecular weight plasticizers affect the internal properties of the fiber wall as well as the interactions between the fine material forming in-between the fibers. The findings from the current study suggest that the proposed approach to obtain ductile cellulose-rich materials holds promise for the future, but it is also clear that more in-depth research is required to obtain a mechanistic understanding and release the full potential.

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Section: Resultsmentioning

confidence: 81%

Section: ■ Results and Discussionmentioning

confidence: 96%

Highly Ductile Cellulose-Rich Papers Obtained by Ultrasonication-Assisted Incorporation of Low Molecular Weight Plasticizers

Eliasson

Hedenqvist

Brolin

et al. 2023

ACS Sustainable Chem. Eng.

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“…The suspension was disintegrated using a high-pressure fluidizer (Microfluidics M110P, 6, 9, or 12 passes). Cellulose nanocrystals were obtained through the Process Development Center, University of Maine, and produced by Forest Products Laboratory (FPL, Madison, WI) affiliated with the United States Department of Agriculture . Tempo-oxidized fibrils were obtained from the same precursor as the mechanically fibrillated CNFs using a protocol previously described .…”

Section: Methodsmentioning

confidence: 99%

“…Cellulose nanocrystals were obtained through the Process Development Center, University of Maine, and produced by Forest Products Laboratory (FPL, Madison, WI) affiliated with the United States Department of Agriculture. 31 Tempo-oxidized fibrils were obtained from the same precursor as the mechanically fibrillated CNFs using a protocol previously described. 29 Besides fibers, all polymers were obtained commercially from Sigma-Aldrich, and their additional characteristics were reported across studies reported by the supplier.…”

Section: Methodsmentioning

confidence: 99%

Benchmarking the Humidity-Dependent Mechanical Response of (Nano)fibrillated Cellulose and Dissolved Polysaccharides as Sustainable Sand Amendments

Dali,

Abidnejad,

Salim

et al. 2024

Biomacromolecules

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Soil quality is one of the main limiting factor in the development of the food sector in arid areas, mainly due to its poor mechanics and lack of water retention. Soil's organic carbon is nearly absent in arid soils, though it is important for water and nutrient transport, to soil mechanics, to prevent erosion, and as a long-term carbon sink. In this study, we evaluate the potential benefits that are brought to inert sand by the incorporation of a range of, mainly, cellulosic networks in their polymeric or structured (fiber) forms, analogously to those found in healthy soils. We explore the impact of a wide range of nonfood polysaccharide-based amendments, including pulp fibers, nanocellulose, cellulose derivatives, and other readily available polysaccharide structures derived from arthropods (chitosan) or fruit peels (pectin) residues. A practical methodology is presented to form sand−polymer composites, which are evaluated for their soil mechanics as a function of humidity and the dynamics of their response to water. The mechanics are correlated to the network of polymers formed within the pores of the sandy soil, as observed by electron microscopy. The response to water is correlated to both the features of the network and the individual polysaccharides' physicochemical features. We expect this work to provide a rapid and reproducible methodology to benchmark sustainable organic amendments for arid soils.

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“…Thin photonic CNC films are notoriously brittle, which can hinder their application. However, additives such as PEG can acts a plasticizer, resulting in highly flexible films with reduced residual stress from the drying process . Furthermore, the incorporation of plasticizing additives can endow the film with additional functionality.…”

Section: Enhancing Functionality For Photonic Applicationsmentioning

confidence: 99%

Structural Color from Cellulose Nanocrystals or Chitin Nanocrystals: Self-Assembly, Optics, and Applications

Frka-Petesic,

Parton,

Honorato-Rios

et al. 2023

Chem. Rev.

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Widespread concerns over the impact of human activity on the environment have resulted in a desire to replace artificial functional materials with naturally derived alternatives. As such, polysaccharides are drawing increasing attention due to offering a renewable, biodegradable, and biocompatible feedstock for functional nanomaterials. In particular, nanocrystals of cellulose and chitin have emerged as versatile and sustainable building blocks for diverse applications, ranging from mechanical reinforcement to structural coloration. Much of this interest arises from the tendency of these colloidally stable nanoparticles to self-organize in water into a lyotropic cholesteric liquid crystal, which can be readily manipulated in terms of its periodicity, structure, and geometry. Importantly, this helicoidal ordering can be retained into the solid-state, offering an accessible route to complex nanostructured films, coatings, and particles. In this review, the process of forming iridescent, structurally colored films from suspensions of cellulose nanocrystals (CNCs) is summarized and the mechanisms underlying the chemical and physical phenomena at each stage in the process explored. Analogy is then drawn with chitin nanocrystals (ChNCs), allowing for key differences to be critically assessed and strategies toward structural coloration to be presented. Importantly, the progress toward translating this technology from academia to industry is summarized, with unresolved scientific and technical questions put forward as challenges to the community.

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Drying stresses in cellulose nanocrystal coatings: Impact of molecular and macromolecular additives

Cited by 7 publications

References 61 publications

Highly Ductile Cellulose-Rich Papers Obtained by Ultrasonication-Assisted Incorporation of Low Molecular Weight Plasticizers

Highly Ductile Cellulose-Rich Papers Obtained by Ultrasonication-Assisted Incorporation of Low Molecular Weight Plasticizers

Benchmarking the Humidity-Dependent Mechanical Response of (Nano)fibrillated Cellulose and Dissolved Polysaccharides as Sustainable Sand Amendments

Structural Color from Cellulose Nanocrystals or Chitin Nanocrystals: Self-Assembly, Optics, and Applications

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