Abstract
We show that aqueous solutions of ammonium thiocyanate (\(\hbox {NH}_{4}\hbox {SCN}\)) can be used to match the index of refraction of several transparent materials commonly used in experiments, while maintaining low viscosity and density compared to other common refractive index-matching liquids. We present empirical models for estimating the index of refraction, density, and kinematic viscosity of these solutions as a function of temperature and concentration. Finally, we summarize the chemical compatibility of ammonium thiocyanate with materials commonly used in apparatus.
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Acknowledgments
The authors would like to thank M.F. Schatz, who supported early stages of this work with funds from National Science Foundation, Grant #CBET-0853691. Additional support for this project was provided by the Summer Scholarship Fund and the James Borders Physics Student Fellowship at Reed College. The authors also thank M. Yoda, who provided the hydrometers used in this work.
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Borrero-Echeverry, D., Morrison, B.C.A. Aqueous ammonium thiocyanate solutions as refractive index-matching fluids with low density and viscosity. Exp Fluids 57, 123 (2016). https://doi.org/10.1007/s00348-016-2207-8
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DOI: https://doi.org/10.1007/s00348-016-2207-8