Dynamic Friction by Polymer/Surfactant Mixtures Adsorbed on Surfaces

Qian, Linmao; Charlot, and Magali; Perez, Éric; Luengo, Gustavo S.; Potter, A. A.; Cazeneuve, Colette

doi:10.1021/jp047605s

Cited by 27 publications

(25 citation statements)

References 32 publications

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“…One may speculate that depending on the shear rate, tails can be forced to align along the shearing direction more easily than loops, creating a sharper interface between two brushes with little interpenetration and, therefore, low friction. A similar mechanism was previously proposed to explain the differences in friction measured for a cationic polyelectrolyte adsorbed on mica in different configurations: chains adsorbed in the form of open or stretched coils, projecting long extended tails into the solution, showed a lower friction coefficient than more compact coil (loops) configurations (56). In our case, the higher friction observed for hydrophobic surfaces at low loads could be due to the absence of tails on such surfaces (Fig.…”

Section: Friction Forces and Wearsupporting

confidence: 86%

Adsorption, Lubrication, and Wear of Lubricin on Model Surfaces: Polymer Brush-Like Behavior of a Glycoprotein

Zappone

Ruths

Greene

et al. 2007

Biophysical Journal

298

428

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Using a surface force apparatus, we have measured the normal and friction forces between layers of the human glycoprotein lubricin, the major boundary lubricant in articular joints, adsorbed from buffered saline solution on various hydrophilic and hydrophobic surfaces: i), negatively charged mica, ii), positively charged poly-lysine and aminothiol, and iii), hydrophobic alkanethiol monolayers. On all these surfaces lubricin forms dense adsorbed layers of thickness 60-100 nm. The normal force between two surfaces is always repulsive and resembles the steric entropic force measured between layers of end-grafted polymer brushes. This is the microscopic mechanism behind the antiadhesive properties showed by lubricin in clinical tests. For pressures up to approximately 6 atm, lubricin lubricates hydrophilic surfaces, in particular negatively charged mica (friction coefficient mu = 0.02-0.04), much better than hydrophobic surfaces (mu > 0.3). At higher pressures, the friction coefficient is higher (mu > 0.2) for all surfaces considered and the lubricin layers rearrange under shear. However, the glycoprotein still protects the underlying substrate from damage up to much higher pressures. These results support recent suggestions that boundary lubrication and wear protection in articular joints are due to the presence of a biological polyelectrolyte on the cartilage surfaces.

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Section: Friction Forces and Wearsupporting

confidence: 86%

Adsorption, Lubrication, and Wear of Lubricin on Model Surfaces: Polymer Brush-Like Behavior of a Glycoprotein

Zappone

Ruths

Greene

et al. 2007

Biophysical Journal

298

428

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“…Thus, the shear occurs between these surfactant molecules rather than the silica/mica interfaces. In this case, the friction force can be influenced by the sliding speed due to the interpenetration of these carbon chains . Therefore, the friction coefficients increased with increasing speed when the load exceeded F crit .…”

Section: Resultsmentioning

confidence: 98%

Improvement of Load Bearing Capacity of Nanoscale Superlow Friction by Synthesized Fluorinated Surfactant Micelles

Dou²,

Liu

et al. 2018

ACS Appl. Nano Mater.

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Although surfactant micelles usually exhibit superlow friction at the nanoscale due to the formation of the hydration layer, the load-bearing capacity (LBC) is limited. In this study, the friction behaviors of two different surfactant micelles (fluorinated and hydrocarbon surfactants, denoted as F-surfactant and H-surfactant) were compared, with the results showing that both can achieve superlow friction (μ = 0.001−0.002) when the self-assembled micelle layers on the two surfaces were not ruptured. Although the two different surfactant micelles have the similar friction behaviors, the LBC of superlow friction for the F-surfactant is 2.5 times larger than that for the H-surfactant. The mechanisms of the superlow friction and the reasons for different LBC were investigated using an atomic force microscopy. The superlow friction can be attributed to the formation of hydration layer on the surfactant headgroups, whereas the higher LBC for F-surfactant originates from the fatness of its carbon chain, which produces the larger hydrophobic attraction and meanwhile increases the stiffness of the micelle layer.

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“…Polyelectrolyte/surfactant complexes commonly exhibit modified bulk and interfacial properties from their single component counterparts . Much work has been done investigating adsorption mechanisms, layer structure, and forces between surface-bound polyelectrolyte/surfactant mixed layers, − which frequently persist in nonequilibrium conformations. − Such layers are sensitive to the layer formation pathway, and the pathway must be carefully specified when interpreting these systems. Despite the complex adsorption mechanism, many of the same polyelectrolyte/surfactant complexation features that arise in the bulk solution are consistent with findings when the complexes form at a surface.…”

Section: Introductionmentioning

confidence: 99%

Ionic Surfactant Binding to pH-Responsive Polyelectrolyte Brush-Grafted Nanoparticles in Suspension and on Charged Surfaces

Riley¹,

Tilton³

2015

Langmuir

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The interactions between silica nanoparticles grafted with a brush of cationic poly(2-(dimethylamino) ethyl methacrylate) (SiO2-g-PDMAEMA) and anionic surfactant sodium dodecyl sulfate (SDS) is investigated by dynamic light scattering, electrophoretic mobility, quartz crystal microbalance with dissipation, ellipsometry, and atomic force microscopy. SiO2-g-PDMAEMA exhibits pH-dependent charge and size properties which enable the SDS binding to be probed over a range of electrostatic conditions and brush conformations. SDS monomers bind irreversibly to SiO2-g-PDMAEMA at low surfactant concentrations (∼10(-4) M) while exhibiting a pH-dependent threshold above which cooperative, partially reversible SDS binding occurs. At pH 5, SDS binding induces collapse of the highly charged and swollen brush as observed in the bulk by DLS and on surfaces by QCM-D. Similar experiments at pH 9 suggest that SDS binds to the periphery of the weakly charged and deswollen brush and produces SiO2-g-PDMAEMA/SDS complexes with a net negative charge. SiO2-g-PDMAEMA brush collapse and charge neutralization is further confirmed by colloidal probe AFM measurements, where reduced electrosteric repulsions and bridging adhesion are attributed to effects of the bound SDS. Additionally, sequential adsorption schemes with SDS and SiO2-g-PDMAEMA are used to enhance deposition relative to SiO2-g-PDMAEMA direct adsorption on silica. This work shows that the polyelectrolyte brush configuration responds in a more dramatic fashion to SDS than to pH-induced changes in ionization, and this can be exploited to manipulate the structure of adsorbed layers and the corresponding forces of compression and friction between opposing surfaces.

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Dynamic Friction by Polymer/Surfactant Mixtures Adsorbed on Surfaces

Cited by 27 publications

References 32 publications

Adsorption, Lubrication, and Wear of Lubricin on Model Surfaces: Polymer Brush-Like Behavior of a Glycoprotein

Adsorption, Lubrication, and Wear of Lubricin on Model Surfaces: Polymer Brush-Like Behavior of a Glycoprotein

Improvement of Load Bearing Capacity of Nanoscale Superlow Friction by Synthesized Fluorinated Surfactant Micelles

Ionic Surfactant Binding to pH-Responsive Polyelectrolyte Brush-Grafted Nanoparticles in Suspension and on Charged Surfaces

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