Loading...

Investigation on Hydrophobic Particle Mobility in Electrolyte Media under Various Electrokinetic Effects

Shafiei Souderjani, Ali | 2022

255 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54804 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seeadi, Mohammad Hassan; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. Electrophoresis of colloidal and bio-particles, which is the motion of a charged particle under an electric field, is a powerful method for the characterization and separation of particles. Electrophoresis of particles could be in electrolyte and gel mediums. Additional drag force is exerted on the particle in a gel medium due to the 3D polymeric structure. Experimental research and molecular dynamics simulations have shown that the no-slip boundary condition is not valuable for many particles in micro and nano-devices. The Navier slip condition, which represents the amount of slip, must replace the no-boundary condition. Characterization of hydrophobicity for optimal design in microfluidic devices is crucial. So, in this research, Poisson, Navier-Stokes (Brinkman), and Nernst- Planck equations in Comsol multiphysics and MATLAB soft wares were solved simultaneously. By the secant method, the velocity of particles was computed. Also, the effect of nanopore's wall hydrophobicity on ionic current and resistive pulse sensing was investigated. In addition, the effect of non-symmetric solutions like calcium chloride and lanthanum chloride on the electrophoretic motion of particles was considered. This study has shown that by increasing the slip of particles, the velocity of the particle in electrolyte and gel mediums increases, but in large slip length, the polarization of the electric double layer dominates. Also, the hydrophobicity of the nanopore’s wall changes the ionic current and resistive pulse characterization
  9. Keywords:
  10. Hydrogel ; Nanopore ; Electric Double Layer ; Electroosmotic Flow ; Dielectrophoresis Technique ; Hydrophobic Materical ; Charged Particles

 Digital Object List

 Bookmark

No TOC