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M Rides
National Physical Laboratory
Composite materialMelt flow indexMaterials scienceRheometerThermal conductivity
27Publications
8H-index
232Citations
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Publications 27
Newest
#1Simon Dennington (University of Southampton)H-Index: 4
#2Ponkrit Mekkhunthod (University of Southampton)H-Index: 1
Last. Paul Stoodley (University of Southampton)H-Index: 64
view all 8 authors...
Frictional drag from the submerged hull surface of a ship is a major component of the resistance experienced when moving through water. Techniques for measuring frictional drag on test surfaces include towing tanks, flow tunnels and rotating discs. These large-scale methods present practical difficulties that hinder their widespread adoption and they are not conducive to rapid throughput. In this study a miniaturized benchtop rotating disc method is described that uses test discs 25 mm in diamet...
3 CitationsSource
#1A Dawson (National Physical Laboratory)H-Index: 2
#2M Rides (National Physical Laboratory)H-Index: 8
Last. Anthony R. Samano (National Physical Laboratory)H-Index: 1
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Abstract Advances in production are leading to increasing use of polymeric thin films in applications such as automotive bearings. Two approaches have been developed to study the thermophysical properties of these thin films: The first technique based on Flash theory uses a scanning thermal microscopy (SThM) tip in temperature contrast mode to measure thermal diffusivity over a nano-scale area. The SThM tip is in contact with the upper surface of the film to detect a heat pulse delivered by a mi...
9 CitationsSource
#1Simon DenningtonH-Index: 4
Last. Paul StoodleyH-Index: 64
view all 8 authors...
In this study a miniaturised benchtop rotating disc method is described that uses test discs 25 mm in diameter. A highly sensitive analytical rheometer is used to measure the torque acting on the discs rotating in water. Model rough surfaces were prepared by attaching different grades of sandpaper to the disc surface. Discs with experimental antifouling coatings applied were exposed in the marine environment for the accumulation of microbial fouling, and the rotor was capable of detecting the in...
Source
#1Simon DenningtonH-Index: 4
#2David GibbsH-Index: 7
Last. Paul StoodleyH-Index: 64
view all 5 authors...
Use of a sensitive controlled stress rheometer allows the rapid bench-top measurement of small changes in hydrodynamic drag due to mild biofouling such as slime coverage.
#1A Dawson (National Physical Laboratory)H-Index: 2
#2M Rides (National Physical Laboratory)H-Index: 8
Last. Laurie Winkless (National Physical Laboratory)H-Index: 2
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To realize the benefits and optimize the performance of micro- and nano-structured materials and thin films, designers need to understand and thus be able to characterize their thermal, thermophysical, and thermomechanical properties on appropriate length scales. This paper describes the determination of glass-transition temperatures of polymers on the micro-scale, obtained from contact force–distance curves for poly(methyl methacrylate) and poly(vinyl acetate) measured using an atomic force mic...
2 CitationsSource
#1Melissa L. MatherH-Index: 14
#2M RidesH-Index: 8
Last. Paul E. TomlinsH-Index: 12
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The viscoelastic properties of fluids are key to their performance in industries ranging from biotechnology to the automotive industry. Traditionally, fluid viscoelastic properties are monitored with rheometers but these are expensive, require a skilled operator, function over a relatively limited frequency range and are not suitable for in situ monitoring. Piezoelectric cantilevers capable of in situ assessment of the rheological properties of relatively small fluid volumes have the potential t...
7 CitationsSource
#1M Rides (National Physical Laboratory)H-Index: 8
#2Adrian L. Kelly (University of Bradford)H-Index: 16
Last. C R G Allen (National Physical Laboratory)H-Index: 6
view all 3 authors...
Abstract An intercomparison was undertaken to assess the reproducibility of shear viscosity results obtained at high shear rates using extrusion rheometers including an instrumented injection moulding machine. Shear viscosities were obtained at shear rates up to 6 × 10 6 s −1 . The high shear rate results demonstrated good agreement for viscosities up to shear rates of 2 × 10 5 s −1 , with results varying typically by no more than ±25%. This level of reproducibility was considered favourable com...
9 CitationsSource
#1Jan JezekH-Index: 5
#2M Rides (National Physical Laboratory)H-Index: 8
Last. Bernardo Perez-Ramirez (Genzyme)H-Index: 8
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Abstract The use of monoclonal antibodies as therapeutic agents has been increasing steadily over the last decade for the treatment of various conditions. There is often a need to deliver a large dose of the protein, so there is a trend toward developing commercially viable liquid formulations of highly concentrated antibodies. Such concentrated solutions are associated with a number of challenges, including optimization of production processes, plus chemical and physical stability of the final ...
73 CitationsSource
#1M Rides (National Physical Laboratory)H-Index: 8
#2C R G Allen (National Physical Laboratory)H-Index: 6
Last. Graham D. Sims (National Physical Laboratory)H-Index: 4
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The rheological properties of highly filled curing systems are difficult to characterise due to both their highly filled nature and that they are strongly time dependant. Such materials can exhibit complex flow behaviour that include slip and rapidly increasing viscosity with time. In particular, characterisation by extrusion can be practically problematic as the material will inevitably set inside the instrument. The development of a disposable extrusion rheometer suitable for characterising cu...
5 CitationsSource
#1M Rides (National Physical Laboratory)H-Index: 8
#2C R G Allen (National Physical Laboratory)H-Index: 6
Last. Gianpiero CancelliH-Index: 1
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Abstract The current standard for melt flow rate testing, ISO 1133, does not adequately cover the measurement of materials that degrade or further polymerise at the melt flow rate test conditions. Materials such as PET, PBT and PA tend to degrade, sometimes rapidly, at melt temperatures if they contain absorbed water. This results in poor repeatability and reproducibility of melt flow rate results. The ISO Plastics Melt Rheology Working Group (TC61/SC5/WG9) is currently developing a modified mel...
10 CitationsSource
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