New Insights from Rheo-small-angle Neutron Scattering

Michelle A. Calabrese, Norman J. Wagner

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Scopus citations

Abstract

Rheo-small angle neutron scattering (rheo-SANS) methods combine microstructural SANS measurements with an applied deformation field in order to measure flow-induced structures in complex fluids. Such methods enable a robust characterization of the microstructure and flow properties of surfactant wormlike micelle (WLM) solutions. The development of new sample environments now enables the flow-induced microstructure to be measured in the three planes of shear: the flow-vorticity (1-3), flow-gradient (1-2), and gradient-vorticity (2-3) planes. Advances in neutron collection and data analysis have improved the temporal resolution of time-dependent responses, significantly reducing the time required to perform such measurements. Theoretical advances in constitutive modelling and the stress-SANS rule now permit the development and testing of structure-property relationships. Such methodologies have allowed flow instabilities, such as shear and vorticity banding, and shear-induced structural transitions to be identified in WLM solutions. Additional sample environments have enabled the study of WLMs under extensional and Poiseuille flows, in addition to flows in microfluidic devices.

Original languageEnglish (US)
Title of host publicationNon-wettable Surfaces
Subtitle of host publicationTheory, Preparation, and Applications
EditorsCecile A. Dreiss, Yujun Feng
PublisherRoyal Society of Chemistry
Pages193-235
Number of pages43
Edition6
ISBN (Electronic)9781782621546, 9781782625162
DOIs
StatePublished - 2017
Externally publishedYes

Publication series

NameRSC Soft Matter
Number6
Volume2017-January
ISSN (Print)2048-7681
ISSN (Electronic)2048-769X

Bibliographical note

Funding Information:
The authors acknowledge the support of the National Institute of Standards and Technology, U.S. Department of Commerce, and the Institut Laue-Langevin in Grenoble, France in providing the neutron research facilities used in this work. This manuscript was prepared under cooperative agreement 70NANB12H239 from NIST, U.S. Department of Commerce. The statements, findings, conclusions and recommendations are those of the author(s) and do not necessarily reflect the view of NIST or the U.S. Department of Commerce.

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