I would like to measure the surface charge of microspheres with size above 500 micrometer. Since they larger in size, I can't go for zeta potential analysis. It would be greatly appreciated if someone can suggest me a method.
Thanks in advance!
Surface charge and zeta potential are not the same thing. Zeta potential (which is a voltage) is used to estimate surface charge (which is charge). The mathematical models used mean that the estimated charge from zeta potential is a finite distance from the surface, not at the surface.
If you want to know the true surface charge, you best option is potentiometric or conductometric titration. You will have to use titrants appropriate to the surface chemistry of your particles. For example, if you have -OH groups, an acid/base titration will work.
Such titrations have been performed for decades, notably with latex particles.
This Google Scholar search provides some starting points: https://scholar.google.com/scholar?as_q=conductometric+titration+of+latex&as_epq=&as_oq=&as_eq=&as_occt=any&as_sauthors=&as_publication=&as_ylo=&as_yhi=&hl=en&as_sdt=0%2C34
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