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Refractive index measurement

JQ Juan Antonio Quiroga
IC Ignacio Canga
JA José Alonso
DC Daniel Crespo
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For the measurement of the refractive indexes, we followed the method described in22 using an NAR-4T temperature-controlled Abbe refractometer from Atago. In this technique, the molecules of the mixture are aligned perpendicular to the measuring and illuminating prisms of the Abbe refractometer by coating their surfaces with a solution of 1.5 wt% hexadecyltrimethylammonium bromide (HMAB) in methanol. We obtained the two refractive indexes using a polarizing eyepiece. In our reflectometer, we used an incandescent white source and an FB610-10 bandpass filter model from Thorlabs for the measurement of the refractive indexes at λR=613nm.

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