The effects of chain conformation in the microfluidic entry flow of polymer-surfactant systems

Miller, E. and Cooper-White, J (2009) The effects of chain conformation in the microfluidic entry flow of polymer-surfactant systems. JOURNAL OF NON-NEWTONIAN FLUID MECHANICS, 160 1: 22-30. doi:10.1016/j.jnnfm.2009.02.009


Author Miller, E.
Cooper-White, J
Title The effects of chain conformation in the microfluidic entry flow of polymer-surfactant systems
Journal name JOURNAL OF NON-NEWTONIAN FLUID MECHANICS   Check publisher's open access policy
ISSN 0377-0257
Publication date 2009-07
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.jnnfm.2009.02.009
Volume 160
Issue 1
Start page 22
End page 30
Total pages 9
Editor G.H. McKinley
R.Keunings
Place of publication Netherlands
Publisher Elsevier BV
Collection year 2010
Language eng
Subject C1
Abstract An associative polymer-surfactant system has been used to observe the effects of chain conformation in the entry flow through a microfabricated planar 16:116 contraction-expansion geometry. The well-studied system of the flexible polymer poly(ethylene oxide) (PEO) and anionic surfactant sodium dodecyl sulfate (SDS) was used. Dilute polymer solutions with increasing SDS concentration were characterized in steady and dynamic shear, as well as capillary breakup extensional rheology. Based on this characterization, the primary quantitative difference is an increase in zero-shear viscosity as a result of the PEO chain expansion brought on by association of SDS surfactant micelles. However, these quantitatively similar solutions were observed to exhibit much more qualitatively different flow patterns via fluorescent streak imaging in the entry flow. In contrast to previous work on PEO solutions, the PEO-SDS systems were observed to transition to a steady viscoelastic flow regime characterized by stable lip vortices at much lower elasticity and Weissenberg numbers. The resulting insight gained regarding the utility of microfluidic flows in elucidating effects of subtle conformational changes further illustrates the potential for using microfabricated devices as rheometric tools for measuring the properties of dilute and weakly viscoelastic fluids. (C) 2009 Elsevier B.V. All rights reserved.
Keyword Microfluidics
SODIUM DODECYL-SULFATE
VISCOSITY ELASTIC FLUIDS
POLY(ETHYLENE OXIDE)
IONIC SURFACTANTS
EXTENSIONAL FLOWS
GEOMETRIES
SCATTERING
DYNAMICS
BEHAVIOR
DILUTE
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Thu, 03 Sep 2009, 07:55:50 EST by Mr Andrew Martlew on behalf of Aust Institute for Bioengineering & Nanotechnology