This title appears in the Scientific Report :
2011
Please use the identifier:
http://dx.doi.org/10.1039/c1sm06175e in citations.
Please use the identifier: http://hdl.handle.net/2128/4638 in citations.
Interplay between a hydrodynamic instability and a phase transition: the Faraday instability in dispersions of rodlike colloids
Interplay between a hydrodynamic instability and a phase transition: the Faraday instability in dispersions of rodlike colloids
Strong effects of the Faraday instability on suspensions of rodlike colloidal particles are reported through measurements of the critical acceleration and of the surface wave amplitude. We show that the transition to parametrically excited surface waves displays discontinuous and hysteretic features...
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Personal Name(s): | Ballesta, P. |
---|---|
Lettinga, M.P. / Manneville, S. | |
Contributing Institute: |
Weiche Materie; ICS-3 |
Published in: | Soft matter, 7 (2011) S. 11440 - 11446 |
Imprint: |
Cambridge
Royal Society of Chemistry (RSC)
2011
|
Physical Description: |
11440 - 11446 |
DOI: |
10.1039/c1sm06175e |
Document Type: |
Journal Article |
Research Program: |
BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung |
Series Title: |
Soft Matter
7 |
Subject (ZB): | |
Link: |
Get full text OpenAccess Published under German "Allianz" Licensing conditions on 2011-10-20. Available in OpenAccess from 2012-10-20 |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/4638 in citations.
Strong effects of the Faraday instability on suspensions of rodlike colloidal particles are reported through measurements of the critical acceleration and of the surface wave amplitude. We show that the transition to parametrically excited surface waves displays discontinuous and hysteretic features. This subcritical behaviour is attributed to the shear-thinning properties of our colloidal suspensions thanks to a phenomenological model based on rheological data under large amplitude oscillatory shear. Birefringence measurements provide direct evidence that Faraday waves induce local nematic ordering of the rodlike colloids. While local alignment simply follows the surface oscillations for dilute, isotropic suspensions, permanent nematic patches are generated by surface waves in samples close to the isotropic-to-nematic transition and above the transition large domains align in the flow direction. This strong coupling between the fluid microstructure and a hydrodynamic instability is confirmed by numerical computations based on the microstructural response of rodlike viruses in shear flow. |