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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Is microrheometry affected by channel deformation?

Francesco Del Giudice, Francesco Greco1, Paolo Antonio Netti

  • 1Istituto di Ricerche sulla Combustione , IRC-CNR, P.le Tecchio 80, 80125 Naples, Italy.

Biomicrofluidics
|April 22, 2016
PubMed
Summary
This summary is machine-generated.

Channel deformation in microfluidic devices affects particle migration and fluid relaxation time measurements. Using rigid Poly(methylmethacrylate) (PMMA) devices minimizes these errors compared to flexible Poly(dimethylsiloxane) (PDMS).

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Area of Science:

  • Rheology
  • Microfluidics
  • Polymer Science

Background:

  • Microrheometry is crucial for studying complex fluid behaviors where traditional methods fall short.
  • Microfluidic devices, often made from flexible Poly(dimethylsiloxane) (PDMS), can deform under fluid flow, impacting experimental accuracy.
  • Viscoelasticity-induced particle migration is a key phenomenon in microfluidics, used for determining fluid relaxation times.

Purpose of the Study:

  • To investigate the impact of microchannel wall deformation on particle migration.
  • To assess the reliability of fluid relaxation time measurements when channel walls deform.
  • To compare the effects of different wall rigidities (PDMS vs. PMMA) on these phenomena.

Main Methods:

  • Experiments were conducted using PolyEthylene Oxyde solutions in microfluidic devices.
  • Two types of devices were used: one made of flexible PDMS and another of rigid Poly(methylmethacrylate) (PMMA).
  • Particle migration was observed and analyzed under varying flow conditions in both device types.

Main Results:

  • Channel deformation significantly influences particle migration patterns in microfluidic systems.
  • The rigidity of the microchannel walls directly affects the accuracy of measured fluid relaxation times.
  • PMMA devices, being more rigid, provided more reliable measurements compared to PDMS devices.

Conclusions:

  • Microchannel wall rigidity is a critical factor in microrheometry, particularly for viscoelastic fluids.
  • Flexible PDMS channels can introduce significant errors in particle migration studies and relaxation time determination.
  • Rigid materials like PMMA are recommended for accurate microrheological measurements where channel deformation is a concern.