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SUMMARY:Keynote 11 - Development of µRheoSANS and Investigating the Struc
 ture and Rheology of Complex Fluids at High Shear Rate
DTSTART;VALUE=DATE-TIME:20181212T093000Z
DTEND;VALUE=DATE-TIME:20181212T101000Z
DTSTAMP;VALUE=DATE-TIME:20260523T152609Z
UID:indico-contribution-481@lindico453.srv.lu.se
DESCRIPTION:Speakers: Katie Weigandt (National Inst. of Science and Techno
 logy  Center for Neutron Research\, USA)\nWe are developing slit rheometer
 s compatible with simultaneous small angle neutron scattering (SANS) measu
 rements to directly correlate structure and rheology over a broad range of
  conditions. Eventually we hope to probe sample structure in Poiseuille fl
 ow at high shear rates\, under high pressure head\, and relatively high te
 mperatures. This builds upon an existing suite of Couette rheoSANS and flo
 wSANS devices at the NIST Center for Neutron Research that are accessible 
 to the scientific community through a peer reviewed proposal system. Indus
 trial applications\, such as lubrication\, mixing\, spraying and injection
 \, involve the flow of complex fluids at high deformation rates. Clogging\
 , fluid degradation\, and other processing challenges can arise in these e
 xtreme contexts and are often driven by structural changes in the fluid. T
 o date\, we have developed a prototype slit rheometer capable of simultane
 ously measuring structure and rheology of relatively low viscosity or shea
 r thinning fluids (η∞ < 5 mPa∙s) at shear rates up to 100\,000 s-1 an
 d a capillary rheoSANS instrument capable of simultaneously measuring stru
 cture and rheology at rates up to 106 s-1. Our initial investigations have
  focused on measuring wormlike micelle solutions at low to moderate shear 
 rates and comparing the results with Couette rheoSANS measurements. In thi
 s talk we will discuss the ongoing development of µRheoSANS measurements 
 including our existing low-pressure apparatus\, the capillary device and o
 ur newly built high pressure µRheoSANS device\, designed to withstand pre
 ssure drops or pressure heads up to 350 bar. This device will enable us to
  measure SANS at shear rates up to 106 in samples with η∞ ~ 100 mPa∙s
 . Furthermore\, we will discuss the results of a series of experiments aim
 ed at understanding the rheological response of wormlike micelle solutions
  at relatively high shear rates.\n\nhttps://lindico453.srv.lu.se/event/67/
 contributions/481/
LOCATION:Elite Hotel Ideon Tera
URL:https://lindico453.srv.lu.se/event/67/contributions/481/
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