Universität zu Köln

Naumann, Philipp, Datta, Sascha, Sottmann, Thomas, Arlt, Bastian, Frielinghaus, Henrich ORCID: 0000-0002-8812-8783 and Wiegand, Simone ORCID: 0000-0001-6333-1956 (2014). Isothermal Behavior of the Soret Effect in Nonionic Microemulsions: Size Variation by Using Different n-Alkanes. J. Phys. Chem. B, 118 (12). S. 3451 - 3461. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-5207

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Abstract

In this work we investigate the thermodiffusion behavior of microemulsion droplets of the type H2O/n-alkane/C12E5 (pentaethylene glycol monododecyl ether) using the n-alkanes: n-octane, n-decane, n-dodecane, and n-tetradecane. In order to determine the thermodiffusion behavior of these microemulsion droplets, we apply the infrared thermal diffusion forced Rayleigh scattering (IR-TDFRS) technique. We measure the Soret coefficient (S-T) as function of the structure upon approaching the emulsification failure boundary (efb) and as a function of the radius of the spherical o/w microemulsion droplets close to the efb. By varying the chain length of the n-alkanes, we are able to study the thermodiffusion behavior of spherical o/w microemulsion droplets of different sizes at the same temperature. In the investigated range a linear dependence of the Soret coefficient as function of the radius was found. By use of a proposed relationship between the Soret coefficient and the temperature dependence of the interfacial tension, the transition layer I could be determined for the first time. Additionally, small angle neutron scattering (SANS) experiments are performed to determine the size and to prove that the shape of the microemulsion droplets is spherical close to the efb. Accordingly, the scattering curves could be quantitatively described by a combination of a spherical core shell form factor and sticky hard sphere structure factor.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Naumann, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Datta, Sascha UNSPECIFIED UNSPECIFIED UNSPECIFIED Sottmann, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Arlt, Bastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Frielinghaus, Henrich UNSPECIFIED orcid.org/0000-0002-8812-8783 UNSPECIFIED Wiegand, Simone UNSPECIFIED orcid.org/0000-0001-6333-1956 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-443107
DOI:	10.1021/jp412126n
Journal or Publication Title:	J. Phys. Chem. B
Volume:	118
Number:	12
Page Range:	S. 3451 - 3461
Date:	2014
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-5207
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ANGLE NEUTRON-SCATTERING; THERMAL-DIFFUSION; INTERFACIAL-TENSION; THERMOPHORESIS; SEPARATION; MIXTURES; SURFACE; SPHERE; LIGHT; C12E5 Multiple languages Chemistry, Physical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/44310