Universität zu Köln

Wielpuetz, Thomas, Klemmer, Helge F. M., Strey, Reinhard and Sottmann, Thomas (2015). A Journey toward Sulfolane Microemulsions Suggested as Inert, Nonaqueous Reaction Media. Langmuir, 31 (41). S. 11227 - 11236. WASHINGTON: AMER CHEMICAL SOC. ISSN 0743-7463

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Abstract

Recently, it turned out that nanostructured reaction media containing highly inert solvents as tetrahydrothiophen-1,1-dioxide (sulfolane) are beneficial for strongly oxidizing or reductive reactions. Because of their ability of solubilizing polar and nonpolar solvents with a large nanostructured interface in particular microemulsions provide such interesting reaction media. Starting from the pseudoternary microemulsion H2O-n-octane-C12E4/C12E5 (polyoxyethylene n-alkyl ether), water was successively replaced by the highly inert tetrahydrothiophen-1,1-dioxide (sulfolane). We found that an increasing sulfolane content drives the system beyond the tricritical point. Replacing the already long chain surfactants C12E4 and C12E5 by a mixture of the even longer chain surfactants C18E6 and C18E8, we were able to prepare nonaqueous sulfolane microemulsions for the first time. We also teach how in a second step the phase behavior of the hydrophilic sulfolane-n-octane-C18E8 system can be tuned at constant temperature (as required by the reaction conditions) by addition of the hydrophobic cosurfactant 1-octanol (C8E0). The change in curvature that occurs by adding 1-octanol is demonstrated measuring the size of reverse micelles by DLS. We found that the radius varies from at least 8 to 16 nm, a suitable sizes for inverse nanoreaction vessels.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wielpuetz, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Klemmer, Helge F. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strey, Reinhard UNSPECIFIED UNSPECIFIED UNSPECIFIED Sottmann, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-389527
DOI:	10.1021/acs.langmuir.5b02529
Journal or Publication Title:	Langmuir
Volume:	31
Number:	41
Page Range:	S. 11227 - 11236
Date:	2015
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	0743-7463
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TEMPERATURE IONIC LIQUIDS; ANGLE NEUTRON-SCATTERING; PHASE-BEHAVIOR; REVERSE MICELLES; ELECTROCATALYTIC ACTIVITY; ETHYLAMMONIUM NITRATE; SUBSTITUTION-REACTION; TRICRITICAL POINTS; ORGANIC-REACTIONS; GENERAL PATTERNS Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38952