How to calculate stability ratio of gold nanoparticles?

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Almira Ramanaviciene

It depends on modification, probably by evaluation of agregation rate, then spectra will be very useful, spectra is here:

Article Spectrophotometric evaluation of gold nanoparticles as red-o...

Ulhas S Kadam

To measure 'Zeta potential' would be better option for evaluating the stability ratio of AuNPs. Alternatively, UV-Vis spectra would work but it only informs on size or shape but lacks information of surface modifications/electrostatic status of AuNPs.