%0 Journal Article %1 doi:10.1021/acs.langmuir.5b02529 %A Wielpütz, Thomas %A Klemmer, Helge F. M. %A Strey, Reinhard %A Sottmann, Thomas %D 2015 %J Langmuir %K Sottmann %N 41 %P 11227-11235 %R 10.1021/acs.langmuir.5b02529 %T A Journey toward Sulfolane Microemulsions Suggested as Inert, Nonaqueous Reaction Media %U https://doi.org/10.1021/acs.langmuir.5b02529 %V 31 %X 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.

@article{doi:10.1021/acs.langmuir.5b02529, 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. }, added-at = {2021-10-26T08:32:58.000+0200}, author = {Wielpütz, Thomas and Klemmer, Helge F. M. and Strey, Reinhard and Sottmann, Thomas}, biburl = {https://www.bibsonomy.org/bibtex/257564444049bd0a60904cc9ffa528abe/mho}, doi = {10.1021/acs.langmuir.5b02529}, eprint = {https://doi.org/10.1021/acs.langmuir.5b02529}, interhash = {4ed45222e9d351f1ccfdc2fbe0ea3acb}, intrahash = {57564444049bd0a60904cc9ffa528abe}, journal = {Langmuir}, keywords = {Sottmann}, note = {PMID: 26421439}, number = 41, pages = {11227-11235}, timestamp = {2021-10-26T08:32:58.000+0200}, title = {A Journey toward Sulfolane Microemulsions Suggested as Inert, Nonaqueous Reaction Media}, url = {https://doi.org/10.1021/acs.langmuir.5b02529 }, volume = 31, year = 2015 }