28 results found
Li J, wu BILLY, Myant CONNOR, 2016, The Current Landscape for Additive Manufacturing Research
Tsui S, Tandy J, Myant C, et al., 2016, Friction measurements with yoghurt in a simulated tongue-palate contact, Biotribology, Vol: 8, Pages: 1-11
© 2016 The perception of many food attributes is related to mechanical stimulation and friction experienced in the tongue-palate contact during mastication. Friction in the tongue-palate is determined by the changing film properties (composition, component distribution, thickness) in the conjunction. We suggest this evolution is essentially determined by tongue-palate film loss rather than shear flow entrainment which predominates in conventional bearing lubrication. The paper reports friction measurements in a simulated tongue-palate contact for a range of high and low fat dairy foods. A reciprocating, sliding contact with restricted stroke length (< contact width) was used; under these conditions there is negligible shear-entrainment of fluid from outside the contact area. The tongue-palate contact was simulated by a PDMS ball and glass surface. The effect of hydrophobic and hydrophilic surfaces on friction was investigated for different fat contents (0, 4.2, 9.5% wt fat). Friction was measured over 60 s of rubbing. Significant differences were observed in the friction change with time for different fat contents (μ 9.5 < μ 4.2 < μ 0 wt%) and for different surface energy conditions (μ hydrophilic < μ hydrophobic). Post-test visualisation of the rubbed films showed that low friction coefficient was associated with the formation of a thin oil film on deposited particulate solids.
Masen M, Myant C, 2015, Second International Conference on Biotribology (ICoBT), TRIBOLOGY INTERNATIONAL, Vol: 89, Pages: 1-1, ISSN: 0301-679X
Parkes M, Myant C, Cann PM, et al., 2015, Synovial Fluid Lubrication: The Effect of Protein Interactions on Adsorbed and Lubricating Films, Biotribology, Vol: 1-2, Pages: 51-60
© 2015 Elsevier Ltd. All rights reserved. Synovial fluid lubrication is dependent on protective protein films that form between joint surfaces. Under static conditions surface film formation occurs through adsorption, while under dynamic conditions protein aggregation under shear and load becomes the dominant mechanism. This work examines how the protein content of six model synovial fluids affects film formation under static and rolling conditions and if the changes in properties can be correlated. With an increase in the statically adsorbed mass and the rate of adsorption the film thickness under rolling increased. These increases did not correlate with the total protein content of the fluid, but were dependent on the type of protein. An increase in pH reduced the adsorbed mass, rate of adsorption and film thickness, but was of secondary importance to the type of protein. The rolling film thickness was also correlated with the viscoelastic properties of the films formed under static conditions. In this case thinner rolling films corresponded to the more hydrated, viscoelastic adsorbed films. The strong correlations found between the properties of the adsorbed films and those formed under rolling indicate that the same protein-protein and protein-surface interactions may govern both mechanisms of film formation despite the differences in the film structures.
Parkes M, Myant C, Dini D, et al., 2015, Tribology-optimised silk protein hydrogels for articular cartilage repair, TRIBOLOGY INTERNATIONAL, Vol: 89, Pages: 9-18, ISSN: 0301-679X
Fowell MT, Myant C, Spikes HA, et al., 2014, A study of lubricant film thickness in compliant contacts of elastomeric seal materials using a laser induced fluorescence technique, TRIBOLOGY INTERNATIONAL, Vol: 80, Pages: 76-89, ISSN: 0301-679X
Myant C, Cann P, 2014, On the matter of synovial fluid lubrication: Implications for Metal-on-Metal hip tribology, JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, Vol: 34, Pages: 338-348, ISSN: 1751-6161
Myant C, Fowell M, Cann P, 2014, The effect of transient motion on Isoviscous-EHL films in compliant, point, contacts, TRIBOLOGY INTERNATIONAL, Vol: 72, Pages: 98-107, ISSN: 0301-679X
Myant CW, Cann P, 2014, The effect of transient conditions on synovial fluid protein aggregation lubrication, JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, Vol: 34, Pages: 349-357, ISSN: 1751-6161
Parkes M, Myant C, Cann PM, et al., 2014, The effect of buffer solution choice on protein adsorption and lubrication, TRIBOLOGY INTERNATIONAL, Vol: 72, Pages: 108-117, ISSN: 0301-679X
Myant C, Cann P, 2013, In contact observation of model synovial fluid lubricating mechanisms, Tribology International, Vol: 63, Pages: 97-104, ISSN: 0301-679X
This paper examines the fundamental mechanisms of synovial fluid lubrication in artificial joints. Film thickness measurements were made for bovine serum solutions in a model test device. In contact imaging was also carried out to aid interpretation of these results. The results indicated that two types of film are formed; a boundary layer of adsorbed protein molecules, which are augmented by a high-viscosity fluid film generated by hydrodynamic effects. The high-viscosity film is due to inlet aggregation of protein molecules forming a gel which is entrained into the contact preferentially at low speeds. As the speed increases this gel appears to shear thin, giving much lower lubricant film thickness. Results suggest that protein-containing fluids do not obey classical Newtonian EHL models. © 2012 Elsevier Ltd. All rights reserved.
Myant C, Cann P, 2013, In contact observation of model synovial fluid lubricating mechanisms, 1st International Conference on Biotribology (ICoBT), Publisher: ELSEVIER SCI LTD, Pages: 97-104, ISSN: 0301-679X
Myant C, Cann P, 2013, Lubrication of artificial articular joints, Pages: 132-134
Fan J, Myant C, Underwood R, et al., 2012, Synovial fluid lubrication of artificial joints: protein film formation and composition, FARADAY DISCUSSIONS, Vol: 156, Pages: 69-85, ISSN: 1359-6640
Myant C, Underwood R, Fan J, et al., 2012, Lubrication of metal-on-metal hip joints: The effect of protein content and load on film formation and wear, JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, Vol: 6, Pages: 30-40, ISSN: 1751-6161
Myant CW, Fan T, Underwood R, et al., 2012, Synovial Fluid Lubrication of Artificial Joints: Protein Film Formation and Composition, Faraday Discussions, ISSN: 1364-5498
Timm K, Myant C, Nuguid H, et al., 2012, Investigation of friction and perceived skin feel after application of suspensions of various cosmetic powders, INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol: 34, Pages: 458-465, ISSN: 0142-5463
Fan J, Myant CW, Underwood R, et al., 2011, Inlet protein aggregation: a new mechanism for lubricating film formation with model synovial fluids, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, Vol: 225, Pages: 696-709, ISSN: 0954-4119
Timm K, Myant C, Spikes HA, et al., 2011, Cosmetic powder suspensions in compliant, fingerprintlike contacts, BIOINTERPHASES, Vol: 6, Pages: 126-134, ISSN: 1934-8630
Andablo-Reyes E, de Vicente J, Hidalgo-Alvarez R, et al., 2010, Soft Elasto-Hydrodynamic Lubrication, 428th Wilhelm and Else Heraeus Seminar on Physics of Tribology - Understanding Friction and Wear in Technical Systems, Publisher: SPRINGER/PLENUM PUBLISHERS, Pages: 109-114, ISSN: 1023-8883
Andablo-Reyes E, de Vicente J, Hidalgo-Alvarez R, et al., 2010, Soft Elasto-Hydrodynamic Lubrication, Tribology Letters, Vol: 39, Pages: 109-14, ISSN: 1023-8883
This article examines the use of ferrofluids to control starvation in lubricated contacts. Starvation in a ball-plate contact is experimentally studied under sliding-rolling conditions using a Mini Traction Machine (MTM). Friction is measured and the experimental results are presented in the form of Stribeck curves. The volume of lubricant is controlled in such a way that no free bulk oil is present in the vicinity of the contact. An abrupt change in the slope of the Stribeck curve in the Hydrodynamic Lubrication zone is interpreted as the onset of starvation. It is then shown that the use of ferrofluids in the presence of a magnetic field distribution can change the conditions at which this onset of starvation occurs. Different magnetic field distributions are tested for different values of load and ferrofluid viscosity. It is proposed that ferrofluid lubricants in conjunction with a suitably positioned magnetic field can be used to promote replenishment, and thus control and reduce lubricant starvation.
Myant C, Fowell M, Spikes HA, et al., 2010, An Investigation of Lubricant Film Thickness in Sliding Compliant Contacts, TRIBOLOGY TRANSACTIONS, Vol: 53, Pages: 684-694, ISSN: 1040-2004
Myant C, Fowell M, Spikes HA, et al., 2010, An Investigation of Lubricant Film Thickness in Sliding Compliant Contacts, TRIBOLOGY & LUBRICATION TECHNOLOGY, Vol: 66, Pages: 46-+, ISSN: 1545-858X
Myant C, Reddyhoff T, Spikes HA, 2010, Laser-induced fluorescence for film thickness mapping in pure sliding lubricated, compliant, contacts, TRIBOLOGY INTERNATIONAL, Vol: 43, Pages: 1960-1969, ISSN: 0301-679X
Myant C, Spikes HA, 2010, FILM THICKNESS STUDY OF LUBRICATED, COMPLIANT CONTACTS, ASME/STLE International Joint Tribology Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 59-61
Myant C, Spikes HA, Stokes JR, 2010, Influence of load and elastic properties on the rolling and sliding friction of lubricated compliant contacts, TRIBOLOGY INTERNATIONAL, Vol: 43, Pages: 55-63, ISSN: 0301-679X
Myant C, Fowell M, Stokes J, et al., 2009, Film thickness study for soft contacts using an optical interferometric technique
A technique for measuring lubricant film thickness between soft deformable surfaces under low-load/low-pressure conditions using optical interferometry is presented. Results are presented for pure sliding conditions between a rotating PDMS sphere and plain glass flat lubricated with glycerol, sunflower oil, and pure water solutions. Hydrophobic-hydrophilic and hydrophilic-hydrophilic tribopairs of contacting surfaces were studied. Contact profile shapes and film thickness maps were compared to theoretical models and discussed. This is an abstract of a paper presented at the Proceedings of World Tribology Congress (Kyoto, Japan 9/6-11/2009).
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