研究目的
To develop a novel technique for the characterization of the mean pore radius of self-ordered porous anodic alumina membranes using flow measurements under conditions of very low Reynolds number.
研究成果
The proposed method offers a reliable, straightforward, and cost-effective way to determine the mean pore diameter of porous anodic alumina membranes. It eliminates the need for sophisticated equipment and provides results consistent with those obtained from SEM analysis. The method can be extended to other types of porous membranes with similar configurations.
研究不足
The technique relies on membranes with a certain degree of ordering and a somewhat narrow pore size distribution. It may not be applicable to membranes with significantly different pore size distributions or those that do not withstand the solvents used.
1：Experimental Design and Method Selection:
The study utilizes Poiseuille’s law to describe the flow of liquids through cylindrical membrane pores under low Reynolds number conditions. The experimental setup is designed to monitor the liquid level drop as it flows through the membrane, allowing for the determination of the mean pore radius without direct measurement of fluid flow rate and pressure difference.
2：Sample Selection and Data Sources:
Commercial free-standing PAAM discs of 13 mm diameter with a nominal pore diameter of 200 nm and a thickness of 60 μm were used. The pore density was confirmed by SEM analysis.
3：List of Experimental Equipment and Materials:
The setup includes a glass tube (~1.5 m long) and a PTFE cell to support and seal the alumina membrane. Liquids used include n-alkanes, cyclohexane, and toluene.
4：5 m long) and a PTFE cell to support and seal the alumina membrane. Liquids used include n-alkanes, cyclohexane, and toluene.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The glass tube is filled with a liquid to initiate the flow experiment. The liquid level drop is monitored over time to determine the mean pore radius using the H?gen-Poiseuille equation.
5：Data Analysis Methods:
The slope of the graphical representation of the natural logarithm of the ratio of the measured liquid level over the initial liquid level versus time provides the value needed to calculate the mean pore radius.
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