Regarding the dielectric constant of medium and particle. I need a paper in which I can find basic discussion regarding this topic
What you can do is measure the zeta potential of the suspension. This will give you the charge on the particle in suspension.
u should investigate EDAX and XRD analyze so that can study this topic article ..
What you can do is measure the zeta potential of the suspension. This will give you the charge on the particle in suspension.
I am agree with Gaurav A. Bhaduri, in addition to this, from zeta potential data you also confirmed about the suitable pH for future characteristics of your sample.
If you can not measure zeta potential, you can do the following rough experiment:
1) Negative surface charged particles should decolor a methyleneblue water solution (because colorant molecules with a posite charge get atached to the particle surface)
2) Posive surface charged particles should decolor a yellow eosine water solution (because colorant molecules with a negative charge get atached to the particle surface)
Of course your particles should not react with water, and the results strongly depends on pH.
Good luck!
The zeta potential is the best method and accurate way to estimate the surface charge according the pH of solution. on the other hand, you can also estimate the surface charge by following the zero point charge of your material according the previous study and standard and then you can determine the surface charge as before (low value of pH) zero point charge is positive and after zero point charge(high value of pH) is negative.
Zetameters are commercial devices especially dedicated to what you are looking for. Depending on the particle size, 2 kinds of apparatuses are available. Small particles can flow but big particles can not, so 2 different methods must be used, with a little overlapping at average particle sizes.
For instance, the Malvern ZetaSizer Nano ZS can measure the charge of particles of sizes ranging from 0.3 nm to 10 microns, but instruments from ZetaCAD and Micromeritics companies can do the same. For bigger particles, several tens to hundreds of microns and even higher, Surpass zetameter from Anton Paar or another device from ZetaCAD will work.
Alain
Thank u so much my friends for your accurate answers. but i want to know if there is any relation between type of surface charge of particles and dielectric constant of medium in a colloidal system? indeed, whether we can predict the type of surface charge of particle (negative or positive) by dielectric constant of particles and medium phase in colloidal systems?
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