I repeated many sample at same PH but there is different between them? it was for graphene at ethanol it given me 0.226 ,-0.260,and 0.0602 mv
Definitely the physical background of the method used has the effect on reproducibility as well as the homogeneity of your sample. But concerning graphene in ethanol do you suppose, is there well developed diffuse double layer around your graphene partticles? I do not think so... but if you have a graphene oxide there could be a dependence on solution pH.
Definitely the physical background of the method used has the effect on reproducibility as well as the homogeneity of your sample. But concerning graphene in ethanol do you suppose, is there well developed diffuse double layer around your graphene partticles? I do not think so... but if you have a graphene oxide there could be a dependence on solution pH.
Hi Essam,
Are you sure you can reach such high accuracy of 0.0001 mV for Zeta potential measurements? For me, your three numbers is just all around 0 mV!
First thing first, I suggest you may check the unit. If you get 0.226 V (22.6 mV), -0.260 V (-260 mv), and 0.0602 V (60.2 mV), then you may think about some factors causing the big difference.
Then, I believe you may already be quite familiar with the relevant literature about the dispersion and stability of graphene/GO/RGO in various solvents including aqueous/ethanol/...... with different dipole moment and Hansen parameters. There are lots of things to look into, like the structure (using XRD), the element/oxidation state (using XPS and Raman), water/functional groups (using FTIR, UV-Vis, TGA), size/morphology (using microscopy like SEM, TEM and AFM), and photographic images (using the eyes, mobile phones and cameras) of course to give a feeling about stability of the suspension.
Hope this helps.
Best,
Yang
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