Oil sample has a viscosity of 60 cst. Any literature available for selection of suitable diluent?
Unless you have access to electron microscopy, you might wish to consider the method published in Pharm Res (2011) 28: 2204-2222 (which is available at this site), which - unlike DLS - is unaffected by sample viscosity and requires no special equipment (just some mathematical skill and optical contrast) to conduct.
For DLS (dynamic Light Scattering) you need very pure diluent. Although you did not mention what type of oil you were referring to, I guessed, you referred petroleum based oil. If it is, pure dust and moisture free toluene is the most suitable and recommended one. I believe that was your question.
I'm fully agree with previous answer. For DLS measurements of oils toluene, heptane or their mixtures are usually used. Of course, these solvents need to be very pure for experiments. Hexane is also applicable, but it is very volatile solvent.
Dr Gregor, I couldn't download the PDF of the reference Pharm Res (2011) 28: 2204-2222 from Research Gate. Can you please send/attach the PDF? ([email protected])
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