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Floral-Dip Transformation of Flax Linum usitatissimum to Generate Transgenic Progenies with a High Transformation Rate
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Dip-coating of suspensions.

Adrien Gans1, Emilie Dressaire, Bénédicte Colnet

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Summary
This summary is machine-generated.

This study investigates fluid and particle coating on a plate during withdrawal. Three distinct coating regimes were identified based on withdrawal speed and particle concentration, impacting film thickness.

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Area of Science:

  • Fluid dynamics
  • Colloid science
  • Surface science

Background:

  • Plate withdrawal from a fluid results in coating.
  • The Landau-Levich problem describes liquid film entrainment.
  • Particle suspensions introduce complexities to coating phenomena.

Purpose of the Study:

  • Investigate the Landau-Levich problem for non-Brownian particle suspensions.
  • Identify different coating regimes based on experimental parameters.
  • Determine the influence of withdrawal velocity, particle volume fraction, and particle size on coating behavior.

Main Methods:

  • Experimental study of plate withdrawal from particle suspensions.
  • Varying withdrawal velocity (U), particle volume fraction (φ), and particle diameter (2a).
  • Analysis of coating regimes and film thickness in relation to capillary number (Ca) and effective viscosity (η(φ)).

Main Results:

  • Observed three distinct coating regimes: liquid-only, particle-inclusive following Landau-Levich law, and heterogeneous.
  • No particle entrainment at low capillary numbers (Ca).
  • Suspension film thickness follows Landau-Levich law with effective viscosity at high Ca.
  • Intermediate Ca shows complex, heterogeneous coating.

Conclusions:

  • The study elucidates three coating regimes in particle suspensions.
  • Regime transitions are dependent on capillary number, volume fraction, and particle properties.
  • Effective viscosity governs particle suspension coating at high capillary numbers.