The influence of wood extractives on paper-to-paper friction

Garoff, Niklas; Jernberg, Sven; Nilvebrant, Nils‐Olof; Fellers, Christer; Bäckström, Marie

doi:10.3183/npprj-1999-14-04-p320-329

Cited by 10 publications

(11 citation statements)

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“…The coefficient of friction dramatically decreased from 0.7 to 0.15 around a chain length of 14−16 carbon atoms. This trend and the values for the coefficients of friction shown in Figure are similar to those observed in macroscopic friction tests with filter papers based on cotton cellulose 8 The coefficient of friction of cellulose surfaces impregnated with different fatty acids plotted against the number of carbon atoms of the fatty acid (normal loads greater than 10 nN). …”

Section: Resultssupporting

confidence: 72%

“…This trend and the values for the coefficients of friction shown in Figure 8 are similar to those observed in macroscopic friction tests with filter papers based on cotton cellulose. 7 Our experimental results suggest that friction of hydrophilic polymer surfaces under ambient conditions is greatly influenced by the degree of capillary condensation. Furthermore, lubrication by fatty acids is achieved by the formation of stable, vertically oriented, hydrophobic monolayers that can withstand the stresses during sliding and that increase the hydrophobicity of the polymer surface and thereby suppress capillary condensation.…”

Section: Comparison Of the Measured Adhesion Forces With Predictions ...mentioning

confidence: 71%

“…Despite the importance of friction in these applications, a fundamental understanding of the frictional properties of hydrophilic polymers on the single asperity level is still missing. In particular, the effects of boundary lubricants, often occurring in natural materials, − and moisture on friction and adhesion deserve more attention. Moreover, a better understanding of the effect of adhesion and capillary forces at asperities on tribological properties of hydrophilic polymers is important in areas of nanotechnology where polymeric thin films are patterned in air. , …”

Section: Introductionmentioning

confidence: 99%

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The Influence of Fatty Acids and Humidity on Friction and Adhesion of Hydrophilic Polymer Surfaces

Garoff¹,

Zauscher²

2002

Langmuir

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Monolayers of saturated fatty acids of different chain lengths and of 9-cis-octadecenoic acid were physisorbed onto regenerated cellulose surfaces to study their effect on friction and adhesion. Lateral and normal force measurements on these surfaces were carried out at different humidities using an atomic force microscope with chemically functionalized silicon nitride cantilevers. Friction and adhesion of clean cellulose increased significantly with humidity. Adhesion forces at high humidity were predicted well by theory that accounted for the effect of the Laplace pressure due to capillary condensation. The magnitude of friction and adhesion and their dependence on humidity decreased with increasing hydrophobicity of the contacting surfaces. Friction of cellulose surfaces impregnated with different saturated fatty acids decreased sharply from a high level to a low level at a carbon chain length above 14 carbon atoms. Contact angle data indicated that only saturated fatty acids with 16 carbon atoms or more in the carbon chain formed vertically oriented monolayers on cellulose. Our results suggest that friction of hydrophilic polymer surfaces under ambient conditions is greatly influenced by capillary condensation. Furthermore, lubrication by fatty acids is achieved through the formation of vertically oriented, hydrophobic monolayers that can withstand the normal and shear stresses during sliding and increase the hydrophobicity of the polymer surface, thereby decreasing the degree of capillary condensation.

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Section: Resultssupporting

confidence: 72%

Section: Comparison Of the Measured Adhesion Forces With Predictions ...mentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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The Influence of Fatty Acids and Humidity on Friction and Adhesion of Hydrophilic Polymer Surfaces

Garoff¹,

Zauscher²

2002

Langmuir

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“…It is also a well-characterised substance used in many investigations for the purpose of surface modification, see e.g. [19,48,50].…”

Section: A Model Substance For "Contamination" By Wood Extractivesmentioning

confidence: 99%

Formation of multilayers on silica surfaces of a cationic polyelectrolyte and dissolved and colloidal substances originating from mechanical wood pulp-Adsorption and influence on adhesion

Rundlöf¹,

Wågberg²

2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…First, a stearic acid, was utilized in a similar manner to use in previous work for reducing the frictional coefficient. 15 The stearic acid was prepared at 5 mmol/ L by dissolving it in acetone. After complete mixing, the solution was sprayed on a sheet of paper.…”

Section: Reducing Frictional Effectsmentioning

confidence: 99%