Hello everyone,
I am having troubles with the bubble point measurement to find the pore size of my self-fabricated microfiltration membrane, and I couldn't find a proper answer anywhere else.
It is possible to follow La Place equation to find the pore size: Diameter = (4 x surface tension of the liquid x cosine of angle) / pressure
This measurement is done by applying increasing pressure until when we see the bubbles in the surface of the membrane, which means the angle is 0°, therefore cosine 0° = 1.
According to this equation, for example, a membrane with diameter 0.1 micrometers requires a pressure of 28.8 bars, which is a extremely high value.
Is there any limitations of the use of this equation?
I've seen many commercial membranes in which both the pore size and the bubble point pressure are given by the producer and they never match (for example, there is a 0.1 micrometer membrane in which the producer claims the pressure for bubble point is 1.2 bar).
Also, I've seen lots of manuscripts that use this method and equation, but they just mention the equation and the result of the pore size, without ever mentioning the pressure needed. And I don't understand how they can find pore sizes of 0.1 micrometer range.
Could someone help me with this problem?
Thank you in advance.
Dear Vicky Kumar, thank you very much for your answer. However, my problems still remains. I followed the procedure standard that you mentioned, but according to the formula I would need almost 30bar for a 0.1 micrometer membrane pore size. And in lots of papers I see that they use much lower pressures (around 1 or 2 bars) for 0.1 micrometer membranes, and I don't understand how is this possible. I don't know what am I doing wrong.
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