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Dielectric properties of oilwater complexes using terahertz transmission spectroscopy

: Gorenflo, S.; Tauer, U.; Hinkov, I.; Lambrecht, A.; Buchner, R.; Helm, H.


Chemical Physics Letters 421 (2006), Nr.4-6, S.494-498
ISSN: 0009-2614
Fraunhofer IPM ()

Terahertz time-domain spectroscopy (THz-TDS) is used to investigate the water content in synthetic oils. For this purpose, water was added to polyglycol oils, which are able to dissolve a certain percentage of water. Applying THz-TDS, changes in the absorption coefficient and refractive index are observed and characterized. Comparison of the experimental data with predictions based on BeerLambert and LorentzLorenz-theory, respectively, exhibits excellent agreement and clearly indicates that water is not dissolved in form of clusters but rather via hydrogen-bonded oilwater complexes.