Attached is a TEM surface image of Silica nanoparticles coating which is porous but how to calculate pore size. ??
you can use image j software
you can follow these steps to measure pore size or pores area of an image by imagej software:
1: Open file
2: Cutting the image: you have to remove the SEM information bar in the lower part of the picture: Use rectangle that includes just the SEM image. Then use menu image- click on crop
3: Convert image to bmp or tiff format.
4: Introduce scale to software, not image: Click menu Analyze, set scale. It is so easy. more information you can fiind on internet.
5: Binarisation: The image has to be binarized using thresholding procedure. This step is very important, so be careful. use menu image, click adjust then thershold. When the proper threshold is selected just the pores should be colorful.
6: After proper thersholding, use the menu Analyze, click on measure. A new tab (table) will be emerged. you need to know the Feret's diameter of pores. click Results menu on new tab, then click distribution. a new windows will be emerged. then select Feret diameter or area or every parameter as you want.
7: A new window will be emerged showing pore size distribution.
Good luck with Image J. You have a fused set of aggregates made of particles of small primary size. You may wish to measure a surface area via BET and convert to a Sauter Mean Diameter using the equation SSA = 6/D[3,2]. Use porosimetry to determine the pore size distribution.
If you run into trouble using imagej or fiji, you could post your image to the forum, they are very helpful. https://forum.image.sc/tags/fiji
Imagej is a suitable program for that. You could find a lot of videos on youtube about how you could calculate.
Beware of 'dispersion by software' and be aware of primary particles, aggregates, and agglomerates.... To me, the micrograph shows a single square 2-D porous 'particle approximately 800 nm in diameter and ~ 1.4X (1.1 microns) this across the diagonal ... At least this is how the 'ensemble' will behave from a transport perspective. It'll probably block a 1 micron filter as the size extends outside the frame of the micrograph.
But I guess you want me to say something like:
- Average particle size 10.3 nm
- Total number of particles 5284
- 69% particles and 31% void space
Wouldn't you?
Allow the material to settle in water. I suspect it will sink like a brick. Combine this with a Stokes' law calculation and you'll see what size particle can remain in suspension.
yes Dr. Alan F Rawle I was asking for all these, Specially void fraction which is 31% but i want to know about the pore size too. I really appreciated your answers. Thank you so much
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