Direct measurements of non-ionic attraction and nanoscaled lubrication in biomimetic composites from nanofibrillated cellulose and modified carboxymethylated cellulose

Olszewska, Anna; Valle‐Delgado, Juan José; Nikinmaa, Miika; Laine, Janne; Österberg, Monika

doi:10.1039/c3nr03091a

Cited by 26 publications

(26 citation statements)

References 60 publications

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“…For GGM (8.7 GPa) on the other hand no significant modulus decrease was observed. This was expected for WSPS modified nanopapers, in which WSPS act as plasticizer between stiff CNF, enhancing the ductility of the nanopaper in accordance with previous results (Lucenius et al 2014;Olszewska et al 2013b). During film formation from aqueous suspensions, the WSPS form a water-swollen dissipative layer on the CNF surface (Lozhechnikova et al 2014;Eronen et al 2011), thus enhancing the dispersibility of CNF.…”

Section: Resultssupporting

confidence: 72%

Multi-layer nanopaper based composites

et al. 2017

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Native cellulose nanofibrils (CNF) were prepared from bleached birch pulp without any chemical or enzymatic pretreatment. These CNF were modified by adsorption of a small amount of watersoluble polysaccharides and used to prepare nanopapers, which were processed into composites by lamination with an epoxy resin and subsequently cured. The results were compared to the properties of composites prepared using bacterial cellulose nanopapers, since bacterial cellulose constitutes highly pure and crystalline cellulose. It was found that both types of nanopapers significantly improved both the thermal stability and mechanical properties of the epoxy resin. As anticipated, addition of only 2 wt% of watersoluble polysaccharides efficiently hindered crackpropagation within the nanopaper and significantly improved the tensile strength and work of fracture compared to composites containing a conventional nanopaper reinforcement. The mechanical properties of the composites thus reflected the improvement of the nanopaper properties by the polysaccharides. Moreover, it was possible to predict the properties of the final composite from the mechanical performance of the nanopapers.

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Section: Resultssupporting

confidence: 72%

Multi-layer nanopaper based composites

et al. 2017

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“…Previous results have already shown that the addition of 1 wt-% soft lubricating polymer enhances the mechanical properties of CNF films when using carboxymethylated cellulose with grafted polyethylene glycol chains [18]. This is a lower concentration than would be expected for full coverage of individual fibrils.…”

Section: Effect Of the Added Amount Of Water-soluble Polysaccharides mentioning

confidence: 92%

“…Co., Newton, MA) for six passes according to the procedure described in [2]. Prior to fluidization the pulp was washed to sodium form according to the procedure described by Swerin et al [22], in order to control the ionic strength and counter ions [18]. The unmodified CNF was weakly anionic due to the carboxylic acid groups introduced during the pulping process; the charge density of the pulp used was 0.065 meq and the zeta-potential of the corresponding CNF gel at pH 8 was -3 mV [23].…”

Section: Cnf (Cellulose Nanofibrils)mentioning

confidence: 99%

“…In natural composites like wood, silk, mollusk shells or bone the interactions are nonionic, mainly van der Waals interactions and multiple hydrogen bonds. Thus we recently studied biomimetic composites from CNF and poly(ethylene glycol) grafted carboxymethyl cellulose [18] where the interactions between the polymer and CNF are nonionic. We found that, in this system, the water swollen polymer was able to lubricate the interface between fibrils during film formation and as a consequence an even and strong film was formed.…”

Section: Introductionmentioning

confidence: 99%

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Nanocomposite films based on cellulose nanofibrils and water-soluble polysaccharides

Lucenius

Parikka

Österberg

2014

Reactive and Functional Polymers

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All-polysaccharide composite films were prepared from native, unmodified cellulose nanofibrils (CNF) mixed with various natural water-soluble polysaccharides like carboxymethyl cellulose, galactoglucomannan, xyloglucan and guar gum. Composite films were manufactured by pressurized filtration and hot pressing. The mechanical properties of the films were systematically evaluated in the dry and the wet state. GG was furthermore selectively oxidized using galactose oxidase (EC 1.1.3.9), and the effect of the degree of oxidation on the final composite film properties was shown.It was found that all the tested polysaccharides increased the strength and toughness of the dry composite films at 2 weight percent (wt-%) addition to CNF. After soaking the samples for 24h in water, striking differences between the samples were found: already at 2 wt-% CMC the wet strength of the composite films diminished, while the uncharged polysaccharides improved the wet strength. For example, the addition of 2 wt-% GGM increased Young's modulus by a factor of 1.3, the tensile strength by a factor of 2.8, and the toughness by a factor of 3.4. The results are discussed in relation to the amount of water absorbed in the films and possible reasons for the improved properties are suggested.

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“…29,33 Moderate adhesion together with low friction coefficients between modified fibrils seem to be the basis for the improved mechanical properties of composites made of CNF coated with CMC-g-PEG, which are significantly tougher and stronger than CNF films. 30 Besides structural and mechanical characterization, a complete understanding of the tribological properties of CNF is needed. Studies devoted to the analysis of friction and lubrication of CNF films are still scarce, and only occur in some of the works mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired lubricating films of cellulose nanofibrils and hyaluronic acid

Valle‐Delgado

Johansson

Österberg

2016

Colloids and Surfaces B: Biointerfaces

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Please cite this article as: Juan José Valle-Delgado, Leena-Sisko Johansson, MonikaÖsterberg, Bioinspired lubricating films of cellulose nanofibrils and hyaluronic acid, Colloids and Surfaces B: Biointerfaces http://dx.doi. org/10.1016/j.colsurfb.2015.11.047 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 1 Bioinspired lubricating films of cellulose nanofibrils and hyaluronic acid AbstractThe development of materials that combine the excellent mechanical strength of cellulose nanofibrils (CNF) with the lubricating properties of hyaluronic acid (HA) is a new, promising approach to cartilage implants not explored so far. A simple, solvent-free method to produce a very lubricating, strong cellulosic material by covalently attaching HA to the surface of CNF films is described in this work. A detailed analysis of the tribological properties of the CNF films with and without HA is also presented.Surface and friction forces at micro/nanoscale between model hard surfaces (glass microspheres) and the CNF thin films were measured using an atomic force microscope and the colloid probe technique. The effect of HA attachment, the pH and the ionic strength of the aqueous medium on the forces was examined. Excellent lubrication was observed for CNF films with HA attached in conditions where the HA layer was highly hydrated. These results pave the way for the development of new nanocellulosebased materials with good lubrication properties that could be used in biomedical applications.

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Direct measurements of non-ionic attraction and nanoscaled lubrication in biomimetic composites from nanofibrillated cellulose and modified carboxymethylated cellulose

Cited by 26 publications

References 60 publications

Multi-layer nanopaper based composites

Multi-layer nanopaper based composites

Nanocomposite films based on cellulose nanofibrils and water-soluble polysaccharides

Bioinspired lubricating films of cellulose nanofibrils and hyaluronic acid

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