Universität zu Köln

Mohanakumar, Shilpa ORCID: 0000-0001-7098-0065 and Wiegand, Simone ORCID: 0000-0001-6333-1956 (2022). Towards understanding specific ion effects in aqueous media using thermodiffusion. Eur. Phys. J. E, 45 (2). NEW YORK: SPRINGER. ISSN 1292-895X

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Abstract

Specific ion effects play an important role in scientific and technological processes. According to Hofmeister, the influence on the hydrogen bond network depends on the ion and leads to a specific order of the ions. Also thermodiffusion the mass transport caused by a temperature gradient is very sensitive to changes of the hydrogen bond network leading to a ranking according to hydrophilicity of the salt. Hence, we investigate various salt solutions in order to compare with the Hofmeister concept. We have studied three different sodium salts in water as a function of temperature (25-45 degrees C) and concentration (0.5-5 mol kg(-1)) using Thermal Diffusion Forced Rayleigh Scattering (TDFRS). The three anions studied, carbonate, acetate and thiocyanate, span the entire range of the Hofmeister series from hydrophilic to hydrophobic. We compare the results with the recent measurements of the corresponding potassium salts to see to what extent the cation changes the thermodiffusion of the salt.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mohanakumar, Shilpa UNSPECIFIED orcid.org/0000-0001-7098-0065 UNSPECIFIED Wiegand, Simone UNSPECIFIED orcid.org/0000-0001-6333-1956 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-670232
DOI:	10.1140/epje/s10189-022-00164-8
Journal or Publication Title:	Eur. Phys. J. E
Volume:	45
Number:	2
Date:	2022
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1292-895X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THERMAL-DIFFUSION; SORET COEFFICIENT; PARTITION-COEFFICIENTS; TEMPERATURE-DEPENDENCE; ELECTROLYTE-SOLUTIONS; WATER; SIMULATION; MIXTURES; CONDUCTANCE; TRANSPORT Multiple languages Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Applied; Polymer Science Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67023