Dear colleagues,
I am looking for an immersion medium that is roughly 100x more viscous than water, but with the same refraction index (RI) as water (1.33).
The viscosity matches a 90% glycerol solution at rtp, though the RI of this mixture is 1.42.
We were able to lower the RI by using a PEG 45 solution, which has an RI of 1.39 at the used viscosity.
I would be very pleased if anyone could give me a tip in what direction to look for an immersion medium with the desired properties.
Kind regards,
René
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