Related Experiment Video
Updated: Jun 8, 2026
11:51
Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
Contact angle hysteresis of microbead suspensions
Prashant R Waghmare1, Sushanta K Mitra
1Micro and Nano-scale Transport Laboratory, Department of Mechanical Engineering, University of Alberta at Edmonton, Edmonton, Canada T6G 2G8.
Langmuir : the ACS Journal of Surfaces and Colloids
|October 5, 2010
Summary
This study investigates microbead suspensions in microfluidics, finding that increasing microbead concentration lowers surface tension and contact angle. This enhances wetting, crucial for lab-on-a-chip applications.
Area of Science:
- Fluid dynamics
- Surface science
- Biomolecular engineering
Background:
- Microbead suspensions are vital for biomolecule transport in microfluidic devices.
- Understanding their wettability is key for optimizing microfluidic applications.
Purpose of the Study:
- To experimentally investigate the wettability of microbead suspensions.
- To determine the effect of microbead volume fraction on surface tension and contact angle.
Main Methods:
- Surface tension measured using the pendant drop technique.
- Dynamic contact angles (advancing and receding) measured using the sessile drop technique.
- Equilibrium contact angle calculated as the average of dynamic angles.
Main Results:
- Surface tension decreases with increasing microbead volume fraction.
- Equilibrium contact angle decreases with increasing microbead volume fraction.
- Advancement of the contact line is faster than recession for microbead suspensions.
Conclusions:
- Microbead inclusion enhances the wetting capability of suspensions.
- Empirical correlations for surface tension and contact angle are proposed.
- Findings support mechanistic models for capillary transport in lab-on-a-chip devices.
