Carbon black particle size issue
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I measured the particle size of the newly purchased carbon black, and found that the value changed with each measurement; after repeating the tests several times, a stable value of 1.31 microns was obtained. I dissolved carbon black in water and ground it for some time, but the particle size increased. Why? Have they formed a group? However, when carbon black is dissolved in DMF, the particle size can decrease after the same reaction time – why?
1. When carbon black is dissolved in water and ground for a while, its particle size increases: How can it remain in granular form when dissolved in water? Then it becomes a solution; 1.31 micrometers, which corresponds to a pore size of over 8000 mesh. So can your grinder achieve such a fine texture? I guess the carbon black has swelled due to water absorption.
You work in experiments, right? For carbon black, particle size is generally not measured; instead, specific surface area is determined. For the specific methods, you can refer to GB3778-2003, which can be found on Baidu Wenku. The particle size is calculated using the specific surface area; moreover, when you purchase carbon black, the manufacturer will provide you with its specific surface area.
Carbon black is a pigment that is insoluble in water! The particle size of carbon black can only be determined using an electron microscope, and currently only international companies have the capability to do so.