Friction force measurements relevant to de-inking by means of atomic force microscope

Theander, Katarina; Pugh, R.J.; Rutland, Mark W.

doi:10.1016/j.jcis.2005.05.040

Cited by 24 publications

(25 citation statements)

References 26 publications

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“…The friction coefficient is highest for the symmetric sphere-sphere case, which also has the highest surface roughness, and the friction coefficient is lowest for the microcrystalline cellulose surface, having the lowest surface roughness. Those friction values are consistent with previously reported data, Theander et al [11] report friction coefficients around 1 for two cellulose spheres, and Zauscher and Klingenberg [8] have seen a friction coefficient of 0.6 between a cellulose sphere and a flat cellulose surface.…”

Section: Frictionsupporting

confidence: 92%

“…The sign of the potential cannot be directly obtained from the DLVO fitting, but zeta-potential measurements of cellulose show that cellulose is negatively charged above pH 3 [35]. At small surface separations a short-range repulsion was observed in all cases, which has also been observed previously for cellulose [6,7,11,13]. This repulsion has previously been interpreted as an electrosteric repulsion-due to the overlap of charged polymeric chains extending from the two surfaces; the range of the repulsion has been observed to vary with pH and salt concentration which was the rationale behind this assignment [6].…”

Section: Normal Surface Forcessupporting

confidence: 75%

See 1 more Smart Citation

Friction and forces between cellulose model surfaces: A comparison

Stiernstedt

Nordgren

Wågberg

et al. 2006

Journal of Colloid and Interface Science

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106

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Section: Frictionsupporting

confidence: 92%

Section: Normal Surface Forcessupporting

confidence: 75%

Friction and forces between cellulose model surfaces: A comparison

Stiernstedt

Nordgren

Wågberg

et al. 2006

Journal of Colloid and Interface Science

Self Cite

106

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“…Similar values of 1.00  0.05 and 0.84  0.08 were reported by Olszewska et al 29 for the friction coefficients between cellulose microspheres and CNF films in buffers of low ionic strength and pH 4.5 and 7.3, respectively. Friction coefficients between 0.9 and 1.3 were also obtained by Rutland et al 25,28,32 between two cellulose microspheres and between a cellulose microsphere and a solvent cast cellulose film in different aqueous solutions.…”

Section: Practical Implications Of the Lubricating Properties Of Ha-msupporting

confidence: 60%

“…2530 Friction forces between fibrils also play a very important role in the behavior of cellulose materials. Huang et al 31 have measured friction forces between two cellulose fibers, whereas Rutland et al 25,28,32 have studied the effect of different polymers or surfactants on the friction forces between two cellulose microspheres. It has been observed that the adsorption of carboxymethyl cellulose, modified by grafting short chains of polyethylene glycol (CMCg-PEG), remarkably improves the lubrication of both CNF films and reconstituted cellulose fiber networks.…”

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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“…Inter-fiber friction plays an important role in flocculation and network strength of paper (Zauscher and Klingenberg 2001). Relevant work related to the measurement of friction in cellulose systems can be found in several references (Bogdanovic, Tiberg et al 2001;Zauscher and Klingenberg 2001;Theander, Pugh et al 2005;Stiernstedt, Brumer et al 2006;Stiernstedt, Nordgren et al 2006). Friction, lubrication and wear have long been of both technical and practical interest since the operation of many mechanical systems depends on these surface phenomena (Dowson 1998).…”

Section: Friction Phenomena In Cellulose Systemsmentioning

confidence: 99%

Tools to Probe Nanoscale Surface Phenomena in Cellulose Thin Films: Applications in the Area of Adsorption and Friction

Song

Hinestroza

et al. 2009

The Nanoscience and Technology of Renewable Biomaterials

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Under appropriate conditions the acidic and basic groups in polyampholytes dissociate in aqueous solution producing ionic groups and their respective counterions. If the ionic groups on the polymer chain are weak acids or bases, the net charge of the polyampholytes can be changed by varying the pH of the aqueous medium. At the isoelectric point (IEP), the number of positive and negative charges on the polyion is the same, giving a net charge of zero. In the vicinity of the isoelectric pH, the polymers are nearly charge-balanced and exhibit the unusual properties of amphoteric molecules. At conditions of high charge asymmetry (far above or below the isoelectric pH), these polymers exhibit a simple polyelectrolyte-like behavior (

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Friction force measurements relevant to de-inking by means of atomic force microscope

Cited by 24 publications

References 26 publications

Friction and forces between cellulose model surfaces: A comparison

Friction and forces between cellulose model surfaces: A comparison

Bioinspired lubricating films of cellulose nanofibrils and hyaluronic acid

Tools to Probe Nanoscale Surface Phenomena in Cellulose Thin Films: Applications in the Area of Adsorption and Friction

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