Abstract
A highly sensitive radiometer is used at a frequency of 61.2 GHz to study the brightness characteristics of aqueous solutions of non-electrolytes (formamide, dimethylformamide, acetamide, dimethylacetamide) in a wide range of concentrations at 298 K. They are compared to calculated data from dielectric spectra in the millimeter (mm) spectral region. Good agreement is shown between the experimental and calculated radio brightness parameters in the initial range of concentrations, where changes in water hydration in solutions predominate (except for dimethylacetamide). It is found that the characteristic radiation of solutions grows along with the concentration of the non-electrolyte. The effect the number of CH3-groups in molecules has on the radio brightness characteristics is non-additive, due to the different effects of polar and non-polar groups of molecules. The total effect can be established using measurements of the intrinsic radiation of solutions in the millimeter region of the spectrum.
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Funding
This work was performed as part of a State Task for the Kurnakov Institute of General and Inorganic Chemistry in the field of basic scientific research. It was supported by the Russian Foundation for Basic Research, project no. 19-03-00033a.
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Lyashchenko, A.K., Efimov, A.Y. & Dunyashev, V.S. Radiation of Aqueous Solutions of Non-Electrolytes in the Millimeter Range of the Spectrum and Their Dielectric Properties. Russ. J. Phys. Chem. 95, 713–716 (2021). https://doi.org/10.1134/S0036024421040154
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DOI: https://doi.org/10.1134/S0036024421040154