The structure of cellulose nanofibril networks at low concentrations and their stabilizing action on colloidal particles

Nordenström, Malin; Benselfelt, Tobias; Hollertz, Rebecca; Wennmalm, Stefan; Larsson, Per Tomas; Mehandzhiyski, Aleksandar Y.; Rolland, Nicolas; Zozoulenko, Igor; Söderberg, Daniel; Wågberg, Lars

doi:10.1016/j.carbpol.2022.120046

Cited by 12 publications

(24 citation statements)

References 36 publications

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“…A direct way to measure mesh sizes was demonstrated by Nordenström et al [72] . using the diffusion of spherical tracer particles and fluorescent correlation spectroscopy.…”

Section: Volume‐spanning Arrested States: Colloidal Glasses and Gelsmentioning

confidence: 99%

“…The colors indicate different concentrations, and the squares and circles represent CNFs from bleached and unbleached pulps. The data were kindly provided by Arcari et al [69] A direct way to measure mesh sizes was demonstrated by Nordenström et al [72] using the diffusion of spherical tracer particles and fluorescent correlation spectroscopy. The Langevin-Rondelez approach [73] was used to distinguish between particles with a diameter (d) that were in the mesh mode (d/ξ < 1) and diffused according to the macroscopic viscosity of the network or particles that were more influenced by direct contact with the network (d/ξ > 1).…”

Section: The Mesh Size Of Nanocellulose Networkmentioning

confidence: 99%

“…These experimental findings were compared to a coarse-grained molecular dynamics simulation which showed excellent agreement (Figure 12b). [72] The mesh size is inversely proportional to the shear modulus of fibril networks; for semi-flexible actin fibrils, a smaller mesh size gives stiffer networks, according to Equation ( 11), [74]…”

Section: The Mesh Size Of Nanocellulose Networkmentioning

confidence: 99%

“…[77] Nanocelluloses can thus be used to develop bio-inks for the 3D printing of hydrogel scaffolds aimed toward regenerative medicine. [78] The same principle makes nanocelluloses, espe- [72] cially CNFs, very efficient thickeners in food processing industries or, for example, in the production of inks for gelbased ballpoint pens. [79] A phenomenon related to shear thinning is what scientists often observe as the formation of weak physical gels (glasses) after aging nanocellulose dispersions for a few hours or days.…”

Section: Shear-thinningmentioning

confidence: 99%

“…Traditionally, the irreversible change of properties induced by the drying of cellulosic materials has often been explained by hydrogen bonds. Although hydrogen bonds may form as the interfibrillar [72] with permission from Elsevier.…”

Section: Drying and Redispersing Nanocellulosementioning

confidence: 99%

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The Colloidal Properties of Nanocellulose

et al. 2023

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Nanocelluloses are anisotropic nanoparticles of semicrystalline assemblies of glucan polymers. They have great potential as renewable building blocks in the materials platform of a more sustainable society. As a result, the research on nanocellulose has grown exponentially over the last decades. To fully utilize the properties of nanocelluloses, a fundamental understanding of their colloidal behavior is necessary. As elongated particles with dimensions in a critical nanosize range, their colloidal properties are complex, with several behaviors not covered by classical theories. In this comprehensive Review, we describe the most prominent colloidal behaviors of nanocellulose by combining experimental data and theoretical descriptions. We discuss the preparation and characterization of nanocellulose dispersions, how they form networks at low concentrations, how classical theories cannot describe their behavior, and how they interact with other colloids. We then show examples of how scientists can use this fundamental knowledge to control the assembly of nanocellulose into new materials with exceptional properties. We hope aspiring and established researchers will use this Review as a guide.

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“…A direct way to measure mesh sizes was demonstrated by Nordenström et al [72] . using the diffusion of spherical tracer particles and fluorescent correlation spectroscopy.…”

Section: Volume‐spanning Arrested States: Colloidal Glasses and Gelsmentioning

confidence: 99%

Section: The Mesh Size Of Nanocellulose Networkmentioning

confidence: 99%

Section: The Mesh Size Of Nanocellulose Networkmentioning

confidence: 99%

Section: Shear-thinningmentioning

confidence: 99%

Section: Drying and Redispersing Nanocellulosementioning

confidence: 99%

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The Colloidal Properties of Nanocellulose

et al. 2023

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Martini 3 model of surface modified cellulose nanocrystals: investigation of aqueous colloidal stability

2022

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The Martini coarse-grained force field is one of the most popular coarse-grained models for molecular dynamics (MD) modelling in biology, chemistry, and material science. Recently, a new force field version, Martini 3, had been reported with improved interaction balance and many new bead types. Here, we present a new cellulose nanocrystal (CNC) model based on Martini 3. The calculated CNC structures, lattice parameters, and mechanical properties reproduce experimental measurements well and provide an improvement over previous CNC models. Then, surface modifications with COO− groups and interactions with Na+ ions were fitted based on the atomistic MD results to reproduce the interactions between surface-modified CNCs. Finally, the colloidal stability and dispersion properties were studied with varied NaCl concentrations and a good agreement with experimental results was found. Our work brings new progress toward CNC modelling to describe different surface modifications and colloidal solutions that were not available in previous coarse-grained models. Graphical abstract

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Influence of fibril aspect ratio, chemical functionality, and volume fraction on the mechanical properties of cellulose nanofibril materials

Sellman,

Rostami,

Östmans

et al. 2024

Cellulose

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Nanocellulose has emerged as a widely utilized building block in nanostructured materials due to its availability, sustainability, large surface area, and high stiffness and aspect ratio. The wet or dry elastoplastic properties of these materials are determined by the fibrils' stiffness, chemical properties, hemicellulose content, and the number of fibril contacts. However, the specific contributions and relative importance of each factor remain unclear. Therefore, this work was devoted to systematically comparing the material properties of gels, aerogels, and wet and dry sheets prepared from CNFs with different aspect ratios, chemical functionality, and hemicellulose content. The fibrils were prepared by chemical and mechanical processing of different pulps. By preserving the native structure as much as possible, higher aspect ratio fibrils can be obtained, which allows for the development of more mechanically robust materials. The results demonstrate that higher aspect ratios lead to more interconnected networks at a lower solids concentration, resulting in a more evenly distributed stress and longer-range stress transfer, yielding stiffer and more ductile materials. The most important finding was that the aspect ratio influences the network formation, resulting in different network topologies. The results were also compared to earlier published data and integrated into a theoretical beam-bending model for a complete elastoplastic description of the network properties, including the influence of fibril aspect ratio and chemical functionality. This information improves our understanding and description of nanofibril networks for which general models have been missing. It can be used to optimize nanofibril preparation and, hence, the resulting eco-friendly materials.

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The structure of cellulose nanofibril networks at low concentrations and their stabilizing action on colloidal particles

Cited by 12 publications

References 36 publications

The Colloidal Properties of Nanocellulose

The Colloidal Properties of Nanocellulose

Martini 3 model of surface modified cellulose nanocrystals: investigation of aqueous colloidal stability

Influence of fibril aspect ratio, chemical functionality, and volume fraction on the mechanical properties of cellulose nanofibril materials

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