Polymer Brushes and Surface Forces

Klein, Jacob; Briscoe, Wuge H.; Chen, Meng; Eiser, Erika; Kampf, Nir; Raviv, Uri; Tadmor, Rafael

doi:10.1002/9781118505175.ch4

Cited by 11 publications

(13 citation statements)

References 135 publications

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“…66 At the same time the weak mutual interpenetration δ of the brushes noted earlier (δ ∼ D −1/3 ) ensures a fluid interfacial region, with low monomer−monomer friction due to the hydration layers about the ionized monomers, and thus low shear stress (i.e., friction) on sliding. At higher compressions, when greater brush interpenetration occurs, it is likely that the hydration lubrication mechanism "kicks in" more prominently as noted above.…”

Section: Interactions Between Polymer-bearingmentioning

confidence: 98%

Hydration Lubrication: The Macromolecular Domain

2015

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Macromolecules, which adsorb or intrinsically form boundary layers at surfaces sliding past each other in aqueous media, are ubiquitous both in technology and in biological systems and can form effective boundary lubricants. Over the past decade or so, hydration layersrobustly bound water molecules that surround charges or zwitterionic groups of different macromolecular specieshave been identified as remarkable lubricating elements, sustaining high loads while exhibiting a fluid-like response to shear with extremely low friction. This modification of frictional forces in aqueous systems, based on the behavior of water molecules confined to hydration shells, is the central idea behind the hydration lubrication mechanism, which is presented and discussed in detail in the current Perspective. We describe the nature of hydration under confinement and the underlying experiments revealing this mechanism, focusing in particular on synthetic and biological macromolecules attached to surfaces and on phospholipid assemblies. We also emphasize these recent findings in relation to physiological environments and functions of the human body, such as cartilage lubrication, in which hydration lubrication is believed to play an important role.

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Section: Interactions Between Polymer-bearingmentioning

confidence: 98%

Hydration Lubrication: The Macromolecular Domain

2015

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“…Over the past two decades polymer-tethered surfaces have drawn widespread attention in different fields of science and technology. The surfaces modified with grafted polymers have found numerous applications in such areas as, for example, chromatographic separations, lubrication, production of protective coatings and biocompatible materials (Advincula et al 2009;Klein et al 2013;Mittal 2012) Different theoretical approaches have been used to describe the properties of the end-grafted polymer layers. These studies have been the subject of several reviews (Currie et al 2003;Netz and Andelman 2003;Descas et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Janus dumbbells near surfaces modified with tethered chains

Staszewski

Borówko

2019

Adsorption

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Adsorption of dumbbell-shaped particles on polymer-tethered surfaces is studied using molecular dynamics simulations. The bonded layers are built of chains containing "active groups", while the particles consist of two "chemically" different monomers. We analyze the structure of the surface layers, the excess adsorption isotherms of the dumbbells and their retention in a chromatographic process. We discuss how selected parameters affect the behavior of Janus dumbbells near the polymer layers. We show that the structure of the surface layer mainly depends on the position of the active groups in the chains and the assumed particle-chain interactions. The particles penetrate the polymer layer and accumulate close to the active groups.

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“…This suggests that the segment density in the dilute tail region was not significantly changed upon rinsing, since the repulsion at large separation mainly arises from the osmotic pressure arising from the segment density difference at the midpoint between the surfaces and the bulk solution at high ionic strength. 36 In contrast, the forces measured between C-PSLex-coated PMMA differ before and after rinsing as shown in Figures 4c,d,f. The steric force encountered on approach is less long ranged after rinsing.…”

Section: Resultsmentioning

confidence: 86%

Influence of Glycosylation on Interfacial Properties of Recombinant Mucins: Adsorption, Surface Forces, and Friction

Jin

Dédinaité

et al. 2017

Langmuir

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Interfacial properties of two brush-with-anchor mucins, C-P55 and C-PSLex, have been investigated at the aqueous solution/poly(methyl methacrylate) (PMMA) interface. Both are recombinant mucin-type fusion proteins, produced by fusing the glycosylated mucin part of P-selectin glycoprotein ligand-1 (PSLG-1) to the Fc part of a mouse immunoglobulin in two different cells. They are mainly expressed as dimers upon production. Analysis of the O-glycans shows that the C-PSLex mucin has the longer and more branched side chains, but C-P55 has slightly higher sialic acid content. The adsorption of the mucins to PMMA surfaces was studied by quartz crystal microbalance with dissipation. The sensed mass, including the adsorbed mucin and water trapped in the layer, was found to be similar for these two mucin layers. Atomic force microscopy with colloidal probe was employed to study surface and friction forces between mucin-coated PMMA surfaces. Purely repulsive forces of steric origin were observed between mucin layers on compression, whereas a small adhesion was detected between both mucin layers on decompression. This was attributed to chain entanglement. The friction force between C-PSLex-coated PMMA is lower than that between C-P55-coated PMMA at low loads, but vice versa at high loads. We discuss our results in terms of the differences in the glycosylation composition of these two mucins.

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Polymer Brushes and Surface Forces

Cited by 11 publications

References 135 publications

Hydration Lubrication: The Macromolecular Domain

Hydration Lubrication: The Macromolecular Domain

Janus dumbbells near surfaces modified with tethered chains

Influence of Glycosylation on Interfacial Properties of Recombinant Mucins: Adsorption, Surface Forces, and Friction

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