Thickness effects in particle-tracking microrheology measurements of a fluid in a thin channel between gel and glass

Key Points

• The aim is to explore how the thickness of a fluid layer impacts particle mobility during microrheology measurements.
• Applied particle-tracking microrheology to a water layer between gel and glass surfaces.
• Measured the diffusion coefficient of particles at varying thickness and particle sizes.
• Compared findings with predictions from the Faxén equation.
• Diffusion coefficient decreased as the thickness to particle radius ratio decreased.
• Results closely aligned with theoretical predictions from the Faxén equation.