![]()
Test - lowercase jpg
![]()
Kaixin micro test
![]()
Test probe P100-M3
There are several techniques used to measure the pore size of materials, including nitrogen adsorption, mercury intrusion, and the bubble pressure method. However, when it comes to membrane materials, the bubble pressure method—also known as the gas-liquid flooding method—is often considered the most appropriate choice. Here's why:
First, let's look at the limitations of nitrogen adsorption.
1. The pore size range it can detect is between 0.35 nm and 500 nm, which means it’s not suitable for measuring micrometer-sized pores.
2. Nitrogen adsorption can result in significant errors when applied to membranes. This is because the inner and outer surfaces of the membrane are smooth, leading to minimal adsorption and thus unreliable results.
3. More importantly, the critical factor in a membrane is the diameter at the narrowest point of the through-hole, but nitrogen adsorption measures both through-holes and blind holes, which leads to inaccurate pore size readings.
Next, we consider the drawbacks of mercury intrusion:
1. Its pore size range spans from 50 nm to 500 μm. To test smaller pores (like those below 100 nm), extremely high pressures (over 20 MPa) are required. Such high pressure can damage or crush the membrane structure, leading to distorted results. In contrast, the bubble pressure method applies much lower pressure—typically under 0.1 MPa—making it safer for delicate membrane samples.
2. Like nitrogen adsorption, mercury intrusion also measures both through-holes and blind holes, rather than focusing on the throat diameter, which is crucial for membrane performance.
The bubble pressure method offers several advantages:
1. It can test pore sizes ranging from 10 nm to 500 μm, making it versatile for various applications.
2. It provides detailed information about the throat diameter, maximum pore size, average pore size, pore size distribution, and permeability of the through-holes.
3. The principle behind this method aligns well with the characteristics of membrane materials, ensuring accurate and reliable results.
In summary, while other methods have their uses, the bubble pressure method stands out due to its accuracy, safety, and suitability for testing the critical pore dimensions of membrane materials.
Distribution Box
The typical distribution box is equipped with a solid case that is capable of protecting the interior components from various adverse conditions, such as excessive exposure to heat or cold. The wiring and other parts that are contained in the box are usually mounted within the interior, helping to lessen the potential for the components to be damaged during any type of shifting that would otherwise create some type of abrasive action on wire coverings and other elements.
We have a lot of Distribution Point Box,including 1pair drop wire box,4pair STB module box,10pair Distribution Point Box,20pair DP box.What's more,we can provide you 10pair pouyet DP box.
The distribution box made of ABS, PC,have good quality and good price.
Waterproof Distribution Box, Outdoor Distribution Box, Distribution Box
NINGBO YULIANG TELECOM MUNICATIONS EQUIPMENT CO.,LTD. , https://www.yltelecom.com
