Journal
RHEOLOGICA ACTA
Volume 48, Issue 5, Pages 563-578Publisher
SPRINGER
DOI: 10.1007/s00397-009-0355-y
Keywords
Sepiolite; Fiber; Clay; Poly(ethylene oxide); Nanocomposites; Colloidal suspension; SAXS; Extension flow; Rheo-SAXS
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The structure and orientation dynamics of sepiolite clay fibers about 1,000 nm long and 10 nm thick, suspended in an aqueous poly(ehtylene oxide) matrix of 10(5) g/mol molecular mass, have been studied under control extensional and shear flow. A new extensional flow cell developed at the Laboratoire de Rh,ologie and the combined rheology and small angle X-ray scattering (Rheo-SAXS) setup available at the European Synchrotron Radiation Facility have allowed access to in situ and time-resolved fiber orientations and structure properties in the volume of suspensions under flow. In the volume fractions and shear rate domains for which the suspensions exhibit shear-thinning properties, two regimes of orientation separated by a critical strain rate have been identified under extensional flow.
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