Related Experiment Video
Updated: Apr 7, 2026
The Microfluidic Probe: Operation and Use for Localized Surface Processing
Published on: June 4, 2009
Two-Aperture Microfluidic Probes as Flow Dipole: Theory and Applications
Mohammadali Safavieh1, Mohammad A Qasaimeh2, Ali Vakil3
11] Institut national de la recherche scientifique (INRS)- Énergie Matériaux Télécommunications (EMT), Université du Québec, 1650 Boulevard Lionel-Boulet, Varennes, J3× 1S2, Québec, Canada [2] Department of Biomedical Engineering, McGill University, Montréal, Quebec, H3A 1A4, Canada.
This study presents an analytical model for microfluidic probes (MFPs), detailing hydrodynamic confinement and mass transfer. The model guides MFP design for precise control and preservation of delicate biological samples.
Area of Science:
- Microfluidics
- Fluid Dynamics
- Biotechnology
Background:
- Microfluidic probes (MFPs) are versatile channel-less systems used in applications like surface patterning and tissue perfusion.
- Current MFP operation relies on empirical adjustments due to a lack of detailed hydrodynamic and mass transfer analysis.
Purpose of the Study:
- To develop an analytical model for predicting key transport properties in microfluidic probe (MFP) operation.
- To provide a framework for optimizing MFP design and usage, particularly for shear-sensitive applications.
Main Methods:
- An analytical model was developed to describe hydrodynamic flow confinement (HFC) area, diffusion broadening, and shear stress.
- Model predictions were validated using numerical simulations and existing experimental data.
Main Results:
- The model quantifies transport properties as a function of probe geometry, flow rate ratio, substrate gap, and reagent diffusivity.
- Analytical results and scaling laws were successfully validated against simulations and experimental data.
Conclusions:
- The developed analytical model provides crucial insights into MFP hydrodynamics and mass transfer.
- This model will aid in the rational design and operation of MFPs, enabling precise control over the "brush stroke" and protecting shear-sensitive cells and tissues.
