Different methods such as zeta potential, UV spectophotometer, pH etc. are used to determine the homogeneous of nanofluid. However, the most effective method for the homogeneity of suspensions has been examined differently in the literature. According to your expert opinion, which method should be preferred for the stability of nanofluids?
Visual observation
UV/vis spectrophotometry
Dynamic light scattering
Zeta potential is only useful if you know that only electrostatic forces are present for repulsion. For sterically-stabilized colloids or lyophilic ones, zeta potential won't tell you very much.
Hi Şenol,
There are many characterization techniques to assess the stability of a nanofluid. This largely depends on the type of destabilizers your dispersion will be exposed to (which could be as simple as storage time).
As Dr. Miller explains, and contrary to common practices in the nanofluid literature, zeta potential should not be interpreted as a definitive indicator of colloidal stability/instability in a nanofluid, unless this nanofluid is purely stabilized by electrostatic repulsion between nanoparticles. In other words, zeta potential can be a quantitative measure of charge-induced stability.
In Section 6 of Article On the colloidal and chemical stability of solar nanofluids:...
, the direct and indirect characterization techniques indicated in the attached figure are detailed (which applies to all types of nanofluids).
In many cases, multiple characterization techniques can be used to complement one another. In other cases, a single technique can be conclusive. But it is hard to label a single technique as 'most effective'.
UV-vis spectroscopy and zeta potential are prominent methods for measuring stability of nanofluids.
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