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View article: Deep learning for enhancement of low-resolution and noisy scanning probe microscopy images
Deep learning for enhancement of low-resolution and noisy scanning probe microscopy images Open
In this study, we employed traditional methods and deep learning models to improve resolution and quality of low-resolution AFM images made under standard ambient scanning. Both traditional methods and deep learning models were benchmarked…
View article: Origins of synergy in multilipid lubrication
Origins of synergy in multilipid lubrication Open
Lipid bilayers, ubiquitous in living systems, form lubricious boundary layers in aqueous media, with broad relevance for biolubrication, especially in mechanically stressed environments such as articular cartilage in joints, as well as for…
View article: Self-assembly of sustainable plant protein protofilaments into a hydrogel for ultra-low friction across length scales
Self-assembly of sustainable plant protein protofilaments into a hydrogel for ultra-low friction across length scales Open
Designing plant protein-based aqueous lubricants can be of great potential to achieve sustainability objectives by capitalising on inherent functional groups without using synthetic chemicals; however, such a concept remains in its infancy…
View article: Bioinspired polymer-incorporating self-lubricating and antifouling hydrogels
Bioinspired polymer-incorporating self-lubricating and antifouling hydrogels Open
Healthy articular cartilage has excellent lubricating properties, with friction coefficients reaching extremely low values at physiological pressures. Such high-performing lubricating layer in joints is attributed to the surface hydration …
View article: Cell-inspired, massive electromodulation of interfacial energy dissipation
Cell-inspired, massive electromodulation of interfacial energy dissipation Open
Transient electric fields across cell bilayer membranes can lead to electroporation, as well as to cell fusion, and have been extensively studied. We find that transmembrane electric fields similar to those in cells can lead to a massive, …
View article: Multi-lipid synergy in synovial lubrication: natural redundancy vs. natural selection
Multi-lipid synergy in synovial lubrication: natural redundancy vs. natural selection Open
The very low sliding friction of articular cartilage in the major synovial joints such as hips and knees is crucial for their well-being, and has been attributed to lubrication by phospholipid boundary layers. While single-component lipid …
View article: Neutral polyphosphocholine-modified liposomes as boundary superlubricants
Neutral polyphosphocholine-modified liposomes as boundary superlubricants Open
Boundary lubrication is associated with two sliding molecularly thin lubricated film-coated surfaces, where the energy dissipation occurs at the slip-plane between lubricated films. The hydration lubrication paradigm, which accounts for ul…
View article: Dehydration does not affect lipid-based hydration lubrication
Dehydration does not affect lipid-based hydration lubrication Open
Lipid-headgroup dehydration by DMSO, which should increase friction, is offset by both higher areal head-group density and by rigidity-enhancement of the lipid bilayers, both of which act to reduce frictional dissipation.
View article: Direct measurement of the viscoelectric effect in water
Direct measurement of the viscoelectric effect in water Open
Significance The viscosity of polar liquids increases in an electric field because of its interaction with the dipolar molecules. This viscoelectric effect was measured for organic liquids, but for water, the most important polar liquid, w…
View article: Lipid-Bilayer Assemblies on Polymer-Bearing Surfaces: The Nature of the Slip Plane in Asymmetric Boundary Lubrication
Lipid-Bilayer Assemblies on Polymer-Bearing Surfaces: The Nature of the Slip Plane in Asymmetric Boundary Lubrication Open
Phospholipid-macromolecule complexes have been proposed to form highly efficient, lubricating boundary layers at artificial soft surfaces or at biological surfaces such as articular cartilage, where the friction reduction is attributed to …
View article: Interactions Between Bilayers of Phospholipids Extracted from Human Osteoarthritic Synovial Fluid
Interactions Between Bilayers of Phospholipids Extracted from Human Osteoarthritic Synovial Fluid Open
View article: Effects of Hyaluronan Molecular Weight on the Lubrication of Cartilage-Emulating Boundary Layers
Effects of Hyaluronan Molecular Weight on the Lubrication of Cartilage-Emulating Boundary Layers Open
Osteoarthritic joints contain lower-molecular-weight (MW) hyaluronan (hyaluronic acid, HA) than healthy joints. To understand the relevance of this HA size effect for joint lubrication, the friction and surface structure of cartilage-emula…
View article: The Role of Hyaluronic Acid in Cartilage Boundary Lubrication
The Role of Hyaluronic Acid in Cartilage Boundary Lubrication Open
Hydration lubrication has emerged as a new paradigm for lubrication in aqueous and biological media, accounting especially for the extremely low friction (friction coefficients down to 0.001) of articular cartilage lubrication in joints. A…
View article: Designer Nanoparticles as Robust Superlubrication Vectors
Designer Nanoparticles as Robust Superlubrication Vectors Open
Phosphatidylcholine lipid bilayers or liposomes at interfaces in aqueous environments can provide extremely efficient lubrication. This is attributed to the hydration lubrication mechanism acting at the highly hydrated phosphocholine-headg…
View article: Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2
Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2 Open
Composites of poly(l-lactic acid) (PLLA) reinforced by adding inorganic nanotubes of tungsten disulfide (INT–WS2) were prepared by solvent casting. In addition to the pristine nanotubes, PLLA nanocomposites containing surface modified nano…
View article: Ultra-low friction between boundary layers of hyaluronan-phosphatidylcholine complexes
Ultra-low friction between boundary layers of hyaluronan-phosphatidylcholine complexes Open
View article: Distinct biological events generated by ECM proteolysis by two homologous collagenases
Distinct biological events generated by ECM proteolysis by two homologous collagenases Open
Significance Extracellular matrix (ECM) proteolysis is an abundant biochemical process. Here we describe the multilayered biological complexity generated by structurally homologous collagenases (matrix metalloproteinase-1 and matrix metall…
View article: Reply to Jee et al. and Israelachvili and Drummond: Lubricant films do not fluidize in intermittent stick-slip friction
Reply to Jee et al. and Israelachvili and Drummond: Lubricant films do not fluidize in intermittent stick-slip friction Open
Jee et al. assert (1) that the effect we measure—what happens to a lubricant film thickness in individual slip events during intermittent stick–slip sliding (2)—was already measured long ago (3, 4), and with better resolution. We are bemus…
View article: On the question of whether lubricants fluidize in stick–slip friction
On the question of whether lubricants fluidize in stick–slip friction Open
Significance The costs to developed economies of friction and wear in technology are some 4–6% of their gross national product, so improved understanding of frictional dissipation can lead to substantial benefits. A widespread mode of fric…
View article: Origins of hydration lubrication
Origins of hydration lubrication Open
Why is friction in healthy hips and knees so low? Hydration lubrication, according to which hydration shells surrounding charges act as lubricating elements in boundary layers (including those coating cartilage in joints), has been invoked…