Journal article 590 views
Is microrheometry affected by channel deformation?
Francesco Del Giudice 
,
Francesco Greco,
Paolo Antonio Netti,
Pier Luca Maffettone
,
Francesco Greco,
Paolo Antonio Netti,
Pier Luca Maffettone
Biomicrofluidics, Volume: 10, Issue: 4, Start page: 043501
Swansea University Author:
Francesco Del Giudice
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DOI (Published version): 10.1063/1.4945603
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 ea...
| Published in: | Biomicrofluidics |
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| ISSN: | 1932-1058 |
| Published: |
AIP Publishing
2016
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa41010 |
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| 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 performed through viscoelasticity induced particle migration in microfluidics devices. If the channel walls are deformed by the flow, the resulting measured value of the relaxation time could be not reliable. In this work, we study the effect of channel deformation on particle migration in square-shaped microchannel. Experiments are carried out in several PolyEthylene Oxyde solutions flowing in two devices made of PDMS and Poly(methylmethacrylate) (PMMA). The relevance of wall rigidity on particle migration is investigated, and the corresponding importance of wall rigidity on the determination of the relaxation time of the suspending liquid is examined. |
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| Keywords: |
Poiseuille flow, Materials fabrication, Materials properties, Polymers, Shear rate dependent viscosity, Fluidic devices, Relaxation times, Viscoelasticity, Rheometry, Microscale flows |
| College: |
Faculty of Science and Engineering |
| Issue: |
4 |
| Start Page: |
043501 |