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001     848302
005     20240619083546.0
024 7 _ |a 10.1021/acs.jpcb.8b01152
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037 _ _ |a FZJ-2018-03552
082 _ _ |a 530
100 1 _ |a Sehnem, André Luiz
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245 _ _ |a Thermodiffusion of Monovalent Organic Salts in Water
260 _ _ |a Washington, DC
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520 _ _ |a The ionic Soret effect induced by temperaturegradients is investigated in organic electrolytes (tetramethylammoniumand tetrabutylammonium hydroxides) dispersed in waterusing a holographic grating experiment. We report the influences oftemperature and salt concentrations on the Soret, diffusion, andthermal diffusion coefficients. Experimental results to the thermaldiffusion coefficient are compared with a theoretical description forthermodiffusion of Brownian particles in liquids based in thethermal expansion of the liquid solution. It is observed that theobtained thermal diffusion coefficients for the organic electrolytespresent a similar temperature dependence as the theoretical prediction. Comparing the experimental results for the organic andcommon inorganic salts it is proposed an additional physical mechanism as the cause to the different thermal diffusioncoefficients in both types of salt. We propose that the temperature dependence of hydration free energy gives rise to a force termthat also leads to ion migration in a temperature gradient. We describe the thermal diffusion results as a competition betweenthermal expansion and hydration effects. The specific structure each type of ion cause in water molecules is considered in the heatof transport theory to describe thermal diffusion of electrolytes. A qualitative agreement is seen between our results and theclassical heat of transport theory.
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700 1 _ |a Niether, Doreen
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700 1 _ |a Wiegand, Simone
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700 1 _ |a Figueiredo Neto, Antônio Martins
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773 _ _ |a 10.1021/acs.jpcb.8b01152
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856 4 _ |y Published on 2018-03-20. Available in OpenAccess from 2019-03-20.
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856 4 _ |y Published on 2018-03-20. Available in OpenAccess from 2019-03-20.
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