Flow-induced structures observed in a viscoelastic reverse wormlike micellar system by magnetic resonance imaging and NMR velocimetry
(2016) In RSC Advances 6(40). p.33339-33347- Abstract
The aim of the present work is to illustrate and discuss an application of rheo-NMR techniques in the investigation of the flow micro-morphology of a rheo-thinning fluid. The viscoelastic material is composed by weakly hydrated nonionic Wormlike Micelles (WM), stabilized by the biocompatible phospholipid in an organic solvent (lecithin organogel). By applying rheo-NMR techniques, such as micro-imaging and flow velocimetry in Couette flow, to lecithin organogels in the concentrated isotropic phase, a new phase nucleating inhomogeneously at the inner rotating cylinder showing periodic fluctuations in space in some cases, has been identified for applied shear rates within the isotropic-nematic stress plateau. On the other hand, evident... (More)
The aim of the present work is to illustrate and discuss an application of rheo-NMR techniques in the investigation of the flow micro-morphology of a rheo-thinning fluid. The viscoelastic material is composed by weakly hydrated nonionic Wormlike Micelles (WM), stabilized by the biocompatible phospholipid in an organic solvent (lecithin organogel). By applying rheo-NMR techniques, such as micro-imaging and flow velocimetry in Couette flow, to lecithin organogels in the concentrated isotropic phase, a new phase nucleating inhomogeneously at the inner rotating cylinder showing periodic fluctuations in space in some cases, has been identified for applied shear rates within the isotropic-nematic stress plateau. On the other hand, evident slippage phenomena have been found in flow regimes consistent with a full shear-induced nematic state. Bulk rheometric investigations executed in oscillatory, steady state and transient mode have been finally carried out to bridge different flow micro-heterogeneities detected by rheo-NMR with a variety of mechanical responses manifested by lecithin WM.
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- author
- Angelico, R. ; Gentile, L. LU ; Ranieri, G. A. and Oliviero Rossi, C.
- organization
- publishing date
- 2016-03-30
- type
- Contribution to journal
- publication status
- published
- subject
- in
- RSC Advances
- volume
- 6
- issue
- 40
- pages
- 9 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- scopus:84964489929
- wos:000374045000014
- ISSN
- 2046-2069
- DOI
- 10.1039/c6ra00206d
- language
- English
- LU publication?
- yes
- id
- 1944aa98-4460-4f79-8859-28baf3b396b4
- date added to LUP
- 2016-10-10 13:09:45
- date last changed
- 2024-06-14 15:22:21
@article{1944aa98-4460-4f79-8859-28baf3b396b4,
abstract = {{<p>The aim of the present work is to illustrate and discuss an application of rheo-NMR techniques in the investigation of the flow micro-morphology of a rheo-thinning fluid. The viscoelastic material is composed by weakly hydrated nonionic Wormlike Micelles (WM), stabilized by the biocompatible phospholipid in an organic solvent (lecithin organogel). By applying rheo-NMR techniques, such as micro-imaging and flow velocimetry in Couette flow, to lecithin organogels in the concentrated isotropic phase, a new phase nucleating inhomogeneously at the inner rotating cylinder showing periodic fluctuations in space in some cases, has been identified for applied shear rates within the isotropic-nematic stress plateau. On the other hand, evident slippage phenomena have been found in flow regimes consistent with a full shear-induced nematic state. Bulk rheometric investigations executed in oscillatory, steady state and transient mode have been finally carried out to bridge different flow micro-heterogeneities detected by rheo-NMR with a variety of mechanical responses manifested by lecithin WM.</p>}},
author = {{Angelico, R. and Gentile, L. and Ranieri, G. A. and Oliviero Rossi, C.}},
issn = {{2046-2069}},
language = {{eng}},
month = {{03}},
number = {{40}},
pages = {{33339--33347}},
publisher = {{Royal Society of Chemistry}},
series = {{RSC Advances}},
title = {{Flow-induced structures observed in a viscoelastic reverse wormlike micellar system by magnetic resonance imaging and NMR velocimetry}},
url = {{http://dx.doi.org/10.1039/c6ra00206d}},
doi = {{10.1039/c6ra00206d}},
volume = {{6}},
year = {{2016}},
}