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NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins
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Internal relaxation time in immersed particulate materials.

P Rognon1, I Einav, C Gay

  • 1School of Civil Engineering, J05, The University of Sydney, Sydney, New South Wales 2006, Australia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

This study reveals a long creep phase precedes flow in elastic particle-fluid materials. Creep time depends on particle separation driven by stress and resisted by viscous friction.

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Area of Science:

  • Soft matter physics
  • Rheology
  • Materials science

Background:

  • Understanding the static-to-flow transition is crucial for complex fluids like pastes and emulsions.
  • Particle interactions, including lubrication and repulsion, govern material behavior.

Purpose of the Study:

  • To investigate the dynamics of the static-to-flow transition in a model elastic particle-viscous fluid system.
  • To elucidate the mechanisms driving creep and flow initiation.

Main Methods:

  • Simulations using soft dynamics to model particle interactions.
  • Applying step increase in shear stress and constant normal stress.
  • Measuring volume changes (dilatancy) and creep times.

Main Results:

  • A prolonged creep phase was observed before substantial flow establishment.
  • Dilatancy remained insignificant during the creep phase.
  • Creep time is determined by particle separation, influenced by applied stress and viscous friction.

Conclusions:

  • The identified mechanism of stress-driven particle separation is relevant to various soft materials.
  • Findings are applicable to granular pastes, living cells, emulsions, and wet foams.