I am doing a time based study and at the initial hours , i am getting considerable high values of hydrodynamic size. The concentration is very low in the range of 3-10ppm and the nanoparticles are phosphorus based and the dispersing medium is the Deionised Water or MQ.
Anurag Nath It depends on the nature of the material used. Also, if the concentration is too low, maybe the DLS is returning a false-positive result. To check that, please see the kcps value. It should be ideally more than 100 which means it has enough particles to scatter the light. It might also be possible that in the initial hours, the dispersion is not effective and what you are getting are the aggregates or clumps of nanoparticles and not actual single particles. For this please check the polydispersity index. It should ideally be less than 0.1. A value above 0.1 indicates the aggregation of particles and the presence of multiple species.
Thank you so much for your response Nabodita Sinha . If you can provide any reference links to this, it will be really helpful because i have been searching for references with specific explanation like you mentioned.
These informations would be available in the zetasizer manual that comes with the machine. All the best!
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