2016
DOI: 10.1063/1.4945603
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Is microrheometry affected by channel deformation?

Abstract: Microrheometry is very important for exploring rheological behaviours of several systems when conventional techniques fail. Microrheometrical measurements are usually carried out in microfluidic devices made of Poly(dimethylsiloxane) (PDMS). Although PDMS is a very cheap material, it is also very easy to deform. In particular, a liquid flowing in a PDMS device, in some circumstances, can effectively deform the microchannel, thus altering the flow conditions. The measure of the fluid relaxation time might be pe… Show more

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Cited by 20 publications
(14 citation statements)
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“…The square-shaped glass microchannel with internal height H = 100 µm and total length L = 10 cm was glued inside the multi-contraction inlet. Glass channel is preferred over the most commonly used polydimethylsiloxane (PDMS) since it is more rigid and therefore prevents channel deformation at high flow rates (channel deformation can affect transversal migration of particles [36]).…”
Section: Methodsmentioning
confidence: 99%
“…The square-shaped glass microchannel with internal height H = 100 µm and total length L = 10 cm was glued inside the multi-contraction inlet. Glass channel is preferred over the most commonly used polydimethylsiloxane (PDMS) since it is more rigid and therefore prevents channel deformation at high flow rates (channel deformation can affect transversal migration of particles [36]).…”
Section: Methodsmentioning
confidence: 99%
“…Despite their many advantages, microfluidic viscometers have certain limitations such as difficulty in handling fouling fluids 115 and the possibility of channel deformation when flexible construction materials are used such as PDMS. 116,117 In contrast to macroscale rheometers that are capable of performing a variety of rheological measurements to obtain material functions, very little progress has been made in using microfluidic devices to measure material functions other than viscosity.…”
Section: Challenges and Future Directionsmentioning
confidence: 99%
“…Nevertheless, there is significant interest in such soft interface problems, from a fundamental transport phenomena perspective [38]. Therefore, beyond the aforementioned studies that have focussed on actively 'poking' microchannels, EHD in microchannels has been studied only to account for its influence [39,40], rather than to exploit its presence for a desired outcome. Only recently, 'peeling' mechanisms of EHD have been demonstrated to allow for shape control of elastic membranes actuated by fluid flow [41,42].…”
Section: Introductionmentioning
confidence: 99%