Probing adhesion between nanoscale cellulose fibres using AFM lateral force spectroscopy: The effect of hemicelluloses on hydrogen bonding

Dolan, Grace K.; Cartwright, Ben; Bonilla, Mauricio R.; Gidley, Michael J.; Stokes, Jason R.; Yakubov, Gleb E.

doi:10.1016/j.carbpol.2018.12.052

Cited by 26 publications

(7 citation statements)

References 79 publications

(103 reference statements)

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“…The micromechanics of the gel fibers measured by AFM (Figure ) shows that for individual fibers or bundles of fibers, there is no significant difference in the mechanical properties of the BC, BC–AX, and BC–XG gels ( p > 0.05). This finding is in agreement with recent AFM studies using “drag-and-dip” lateral force AFM experiments to probe adhesive forces and micromechanics of BC composites, which produced results suggesting that BC, BC–AX, and BC–XG have very similar micromechanical properties . Our observation that MLG significantly reduces the stiffness of cellulose fibers has, to the best of the authors’ knowledge, not been previously reported .…”

Section: Resultssupporting

confidence: 93%

“…This finding is in agreement with recent AFM studies using "drag-and-dip" lateral force AFM experiments to probe adhesive forces and micromechanics of BC composites, which produced results suggesting that BC, BC−AX, and BC−XG have very similar micromechanical properties. 36 Our observation that MLG significantly reduces the stiffness of cellulose fibers has, to the best of the authors' knowledge, not been previously reported. 9 More generally, the discrepancy between AFM-based and rheological data on the BC−MLG gels may simply reflect the fact that the AFM indentation experiments probe only the region at and immediately beneath the gel surface, whereas the rheological experiments reflect the behavior of a much deeper section (as shown by their dependence on the gel thickness).…”

Section: ■ Results and Discussionmentioning

confidence: 53%

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High Molecular Weight Mixed-Linkage Glucan as a Mechanical and Hydration Modulator of Bacterial Cellulose: Characterization by Advanced NMR Spectroscopy

et al. 2019

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Bacterial cellulose (BC) consists of a complex threedimensional organization of ultrafine fibers which provide unique material properties such as softness, biocompatibility, and water-retention ability, of key importance for biomedical applications. However, there is a poor understanding of the molecular features modulating the macroscopic properties of BC gels. We have examined chemically pure BC hydrogels and composites with arabinoxylan (BC−AX), xyloglucan (BC−XG), and high molecular weight mixed-linkage glucan (BC−MLG). Atomic force microscopy showed that MLG greatly reduced the mechanical stiffness of BC gels, while XG and AX did not exert a significant effect. A combination of advanced solid-state NMR methods allowed us to characterize the structure of BC ribbons at ultra-high resolution and to monitor local mobility and water interactions. This has enabled us to unravel the effect of AX, XG, and MLG on the short-range order, mobility, and hydration of BC fibers. Results show that BC−XG hydrogels present BC fibrils of increased surface area, which allows BC−XG gels to hold higher amounts of bound water. We report for the first time that the presence of high molecular weight MLG reduces the density of clusters of BC fibrils and dramatically increases water interactions with BC. Our data supports two key molecular features determining the reduced stiffness of BC−MLG hydrogels, that is, (i) the adsorption of MLG on the surface of BC fibrils precluding the formation of a dense network and (ii) the preorganization of bound water by MLG. Hence, we have produced and fully characterized BC−MLG hydrogels with novel properties which could be potentially employed as renewable materials for applications requiring high water retention capacity (e.g. personal hygiene products).

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Section: Resultssupporting

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 53%

High Molecular Weight Mixed-Linkage Glucan as a Mechanical and Hydration Modulator of Bacterial Cellulose: Characterization by Advanced NMR Spectroscopy

et al. 2019

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“…and, potentially, higher cellulose surface coverage. Such configuration would result in more open pores and at the same time it would reduce the formation of direct adhesive links between cellulose fibrils, thereby preserving the compliant nature of the BC network 48 . For all hydrogels, we observed a marked difference between the E relax and G', which may be explained by considering material anisotropy.…”

Section: Resultsmentioning

confidence: 99%

“…For BC-AGX composites, which show high permeability while being mechanically more compliant, it is possible to suggest that AGX adsorbs onto cellulose fibrils with fewer “dangling segments” and ‘“loops,” and, potentially, higher cellulose surface coverage. Such configuration would result in more open pores and at the same time it would reduce the formation of direct adhesive links between cellulose fibrils, thereby preserving the compliant nature of the BC network 48 .…”

Section: Resultsmentioning

confidence: 99%

Wood hemicelluloses exert distinct biomechanical contributions to cellulose fibrillar networks

et al. 2020

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Hemicelluloses, a family of heterogeneous polysaccharides with complex molecular structures, constitute a fundamental component of lignocellulosic biomass. However, the contribution of each hemicellulose type to the mechanical properties of secondary plant cell walls remains elusive. Here we homogeneously incorporate different combinations of extracted and purified hemicelluloses (xylans and glucomannans) from softwood and hardwood species into self-assembled networks during cellulose biosynthesis in a bacterial model, without altering the morphology and the crystallinity of the cellulose bundles. These composite hydrogels can be therefore envisioned as models of secondary plant cell walls prior to lignification. The incorporated hemicelluloses exhibit both a rigid phase having close interactions with cellulose, together with a flexible phase contributing to the multiscale architecture of the bacterial cellulose hydrogels. The wood hemicelluloses exhibit distinct biomechanical contributions, with glucomannans increasing the elastic modulus in compression, and xylans contributing to a dramatic increase of the elongation at break under tension. These diverging effects cannot be explained solely from the nature of their direct interactions with cellulose, but can be related to the distinct molecular structure of wood xylans and mannans, the multiphase architecture of the hydrogels and the aggregative effects amongst hemicellulose-coated fibrils. Our study contributes to understanding the specific roles of wood xylans and glucomannans in the biomechanical integrity of secondary cell walls in tension and compression and has significance for the development of lignocellulosic materials with controlled assembly and tailored mechanical properties.

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“…To quantify this cohesion, we have studied the adhesion between CNF and AgNWs at the microscopic scale by AFM. We have chosen AFM to probe this adhesion because it has led to successful measurements of the mechanical properties of nanowires or nanofibers [33][34][35].…”

Section: Nanoscale Resultsmentioning

confidence: 99%

Multiscale investigation of the fate of silver during printed paper electronics recycling

Zareeipolgardani

Piednoir

Joyard-Pitiot

et al. 2022

Composite Interfaces

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The use of printed paper electronics in consumer goods is expected to experience a mass development in the next future. The ink used in these devices contains silver nanomaterials that may be released in the environment at the product end-of-life.We report here the first evaluation of the fate of silver during a pilot-scale recycling of printed paper electronics, made of paper printed with a cellulose nanofibrils-silver nanowire ink. We show that the released effluents are mainly free from silver, which is retained in the pulp conserved for recycling. We use atomic force microscopy experiments to show that this strong pulp-silver bond is due to the embedding of the silver nanowires in the pulp by coils of cellulose nanofibrils. We propose an estimate of the resulting adhesion stress of the nanowires to the ink, high enough to keep the silver inside the pulp during the recycling procedure.

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Probing adhesion between nanoscale cellulose fibres using AFM lateral force spectroscopy: The effect of hemicelluloses on hydrogen bonding

Cited by 26 publications

References 79 publications

High Molecular Weight Mixed-Linkage Glucan as a Mechanical and Hydration Modulator of Bacterial Cellulose: Characterization by Advanced NMR Spectroscopy

High Molecular Weight Mixed-Linkage Glucan as a Mechanical and Hydration Modulator of Bacterial Cellulose: Characterization by Advanced NMR Spectroscopy

Wood hemicelluloses exert distinct biomechanical contributions to cellulose fibrillar networks

Multiscale investigation of the fate of silver during printed paper electronics recycling

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