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Flow-induced structures observed in a viscoelastic reverse wormlike micellar system by magnetic resonance imaging and NMR velocimetry

Author:
  • R. Angelico
  • L. Gentile
  • G. A. Ranieri
  • C. Oliviero Rossi
Publishing year: 2016-03-30
Language: English
Pages: 33339-33347
Publication/Series: RSC Advances
Volume: 6
Issue: 40
Document type: Journal article
Publisher: Royal Society of Chemistry

Abstract english

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.

Keywords

  • Physical Chemistry

Other

Published
  • ISSN: 2046-2069
Luigi Gentile
E-mail: luigi [dot] gentile [at] fkem1 [dot] lu [dot] se

Researcher

MEMEG

E-F211

Sölvegatan 37, Lund

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Visiting research fellow

Physical Chemistry

+46 46 222 45 04

1

Research group

Microbial Ecology

Projects

MICCS