Paper Number
PO8 

Session
Poster Session

Title
Capillary RheoSANS: Measuring the rheology and nanostructure of complex fluids at high shear rates

Presentation Date and Time
October 23, 2019 (Wednesday) 6:30

Track / Room
Poster Session / Ballroom C on 4th floor

Authors (Click on name to view author profile)

  1. Murphy, Ryan (NIST Center for Neutron Research)
  2. Riedel, Zachary (Clemson University)
  3. Nakatani, Marshall (George Washington University)
  4. Weston, Javen (University of Tulsa, Chemical Engineering)
  5. Salipante, Paul F. (NIST, Polymers & Complex Fluids)
  6. Liu, Yun (NIST Center for Neutron Research)
  7. Hudson, Steven (NIST)
  8. Weigandt, Katie M. (NIST Center for Neutron Research)

Author and Affiliation Lines (in printed abstract book)
Ryan Murphy1, Zachary Riedel2, Marshall Nakatani3, Javen Weston4, Paul F. Salipante5, Yun Liu1, Steven Hudson6, and Katie M. Weigandt1
1NIST Center for Neutron Research, Gaithersburg, MD 20899; 2Clemson University, Clemson, SC; 3George Washington University, Washington D.C., DC; 4Chemical Engineering, University of Tulsa, Tulsa, OK 74104; 5Polymers & Complex Fluids, NIST, Gaithersburg, MD 20899; 6NIST, Gaithersburg, MD 20899

Speaker / Presenter 
Murphy, Ryan

Text of Abstract
Complex fluids containing surfactants, polymers, nanoparticles, or proteins can change when subjected to flow at high velocity and within confined geometries. These extreme flow environments can generate high shear rates and forces that damage materials during purification, formulation, and application. To better understand these flow-induced effects at high shear rates, a new Capillary RheoSANS (CRSANS) device combines capillary rheometery positioned within small angle neutron scattering (SANS) instruments to simultaneously measure the rheology and nanostructure. Currently, CRSANS measures pressure drops up to 500 bar, shear rate-dependent viscosity up to 1000 mPa-s, and generates apparent wall shear rates up to 10,000,000 s-1. The device recycles relatively small sample volumes (1-2 mL) to facilitate SANS measurements on biological and deuterated samples. Current device capabilities are demonstrated with various model systems, including worm-like micelles, concentrated silica suspensions, lipid bilayers, and the NIST monoclonal antibody. Ongoing work aims to improve measurement precision, lower shear rate boundaries, temperature control, and to enable measurement of higher viscosity samples such as polymer melts, pastes, and slurries.