Simulation, Fabrication and Microfiltration Using Dual Anodic Aluminum Oxide Membrane

Area of Science:

• Biomedical Engineering
• Materials Science
• Fluid Dynamics

Background:

• Microfluidic devices offer controlled fluid manipulation for biomedical applications, including filtration.
• Anodic aluminum oxide (AAO) membranes are potential candidates for micro-filtration due to tunable pore sizes.
• Effective fluid purification is crucial for various biomedical analyses and applications.

Purpose of the Study:

• To fabricate and evaluate dual AAO membranes for microfluidic fluid filtration.
• To investigate the impact of pore size, filtration cycles, and fluid velocity on filtration efficiency.
• To assess the potential of this system for purifying contaminated fluids containing bacteria and protozoans.

Main Methods:

• Fabrication of AAO-based membranes with pore sizes from 70 to 500 nm.
• Utilized fuzzy logic for estimating filtration parameters and finite-element analysis for fluid flow simulation.
• Conducted filtration experiments using dual membranes, analyzing membrane clogging via scanning electron microscopy after multiple cycles.

Main Results:

• Filtration efficiency improved with an increased number of filtration cycles and the use of dual membranes.
• Decreased permeance correlated with increased fluid velocity and permeate volume, indicating impurity removal.
• Demonstrated effective removal of bacteria and protozoans from contaminated fluids.

Conclusions:

• Dual AAO membranes show significant potential for effective microfluidic fluid filtration in biomedical applications.
• The developed microfluidic system offers a promising, low-cost solution for fluid purification challenges.
• Optimizing filtration cycles and membrane configuration enhances purification efficacy.