Can anybody provide a few well cited literatures which show the changes (if any) of dielectric constant with increasing urea concentrations in water?
I hope this one can help:
Wyman, Jeffries. “Dielectric Constants: Ethanol—Diethyl Ether and Urea—Water Solutions between 0 and 50°.” Journal of the American Chemical Society 55, no. 10 (October 1, 1933): 4116–4121. doi:10.1021/ja01337a029.
http://pubs.acs.org/doi/abs/10.1021/ja01337a029
A very interesting paper regarding the effects of urea and N,N-dimethyl urea in water (as well as in some organic solvents) is the following: Liebigs Ann. Chem. 1993, 981 -985. (Investigations on the Polarity of Aqueous Solutions of Urea and Various Sugars by Means of the Solvatochromic Technique; written in German) This paper can give you a more "spherical idea" about how polarity of the urea solutions (not only dielectric constant but also Lewis acidity) vary when changing urea content. I hope it helps. Good Luck !
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