14 February 2014 Volume contraction of monohydric alcohols interrogated by planar Bragg grating sensor
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Abstract
We report on the physical observation of mixtures of volume contractional monohydric alcohol solutions interrogated by a planar Bragg grating sensor. Via evanescent field interaction, the sensor detects any changes of the composition of a liquid compound on the sensor surface that are associated with a change of the refractive index. Studying various aqueous solutions of monohydric alcohols, we found a nonlinear relationship of the analytes refractive index on its mixing ratio, indicating the different nature of the mixed phases in the solution and the effect of volume contraction. Analyzing aqueous solutions of methanol, ethanol, and 2-propanol reveals a local maximum of the refractive index for the application of smaller monohydric alcohol molecules, which is displaced in the direction of a higher alcohol content with an increasing number of carbon atoms in the chain of the alcohols. In turn, this sensor can be used for the online monitoring and observation of the water content in aqueous alcohol solutions, including volume contractional solutions.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Maiko Girschikofsky, Steffen Scheurich, Stefan Belle, Ralf Hellmann, "Volume contraction of monohydric alcohols interrogated by planar Bragg grating sensor," Optical Engineering 53(2), 024104 (14 February 2014). https://doi.org/10.1117/1.OE.53.2.024104 . Submission:
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