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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Area of Science:

  • Colloid and interface science
  • Soft matter physics
  • Transport phenomena

Background:

  • Understanding colloidal particle dynamics is crucial for designing advanced materials.
  • Interfacial and confinement effects significantly alter particle diffusion.
  • Colloidal rods exhibit complex behavior due to their anisotropic shape.

Purpose of the Study:

  • To quantify translational and rotational diffusion of colloidal rods in various confined geometries.
  • To investigate the influence of rod aspect ratio and ionic strength on diffusion.
  • To develop and validate models for predicting colloidal rod transport near boundaries and in porous media.

Main Methods:

  • Optical microscopy was employed to track colloidal rod movement.
  • Measurements were conducted near a single wall, between parallel walls, and in quasi-2D porous media.
  • Varying rod aspect ratios and aqueous solution ionic strengths were tested.

Main Results:

  • Diffusivities increased with proximity to boundaries and for higher aspect ratios.
  • Position-dependent hydrodynamic interaction models accurately predicted diffusivities across all tested geometries.
  • Short-time diffusion in porous media showed unexpected insensitivity to area fraction.

Conclusions:

  • Hydrodynamic interactions and electrostatic interactions govern colloidal rod diffusion in confined and interfacial systems.
  • The findings provide a framework for predicting and interpreting colloidal rod transport in diverse applications.
  • Insights are relevant for biological, environmental, and synthetic material systems involving confined anisotropic particles.