%0 Journal Article %1 D3SM00273J %A Benedix, Robin R. %A Botsch, Sophia %A Preisig, Natalie %A Kovalchuk, Volodymyr %A Jessop, Philip G. %A Stubenrauch, Cosima %D 2023 %I The Royal Society of Chemistry %J Soft Matter %K benedix myown stubenrauch %N 16 %P 2941-2948 %R 10.1039/D3SM00273J %T Influence of a CO2-switchable additive on the surface and foaming properties of a cationic non-switchable surfactant %U http://dx.doi.org/10.1039/D3SM00273J %V 19 %X Switchable materials in general and CO2-switchable materials in particular are of great interest in environmental research. The replacement of common non-switchable materials (solutions, solvents, surfactants, etc.) with their switchable counterparts has a great potential to make processes more environmentally friendly by enhancing reusability and circularity and thus reducing energy costs and material consumption. Inspired by this, the present work deals with the surface and foaming properties of aqueous solutions of a non-switchable surfactant in presence of a CO2-switchable additive. A 1 : 1 and a 1 : 5 (molar ratios) mixture of the non-switchable surfactant C14TAB (tetradecyltrimethylammonium bromide) and the CO2-switchable additive TMBDA (N,N,N,N-tetramethyl-1,4-butanediamine) were investigated. It was found that surface properties, foamability, and foam stability can be changed by switching the additive with CO2 as a trigger. This observation can be explained by the fact that TMBDA is surface active in its unprotonated, i.e. neutral form, which disturbs the tight packing of the surfactant molecules on the surface. As a consequence, foams generated with surfactant solutions containing the neutral TMBDA are less stable than their TMBDA-free counterparts. On the other hand, the switched diprotonated additive is a 2 : 1 electrolyte with hardly any surface activity and thus does not affect surface and foam properties.

@article{D3SM00273J, abstract = {Switchable materials in general and CO2-switchable materials in particular are of great interest in environmental research. The replacement of common non-switchable materials (solutions{,} solvents{,} surfactants{,} etc.) with their switchable counterparts has a great potential to make processes more environmentally friendly by enhancing reusability and circularity and thus reducing energy costs and material consumption. Inspired by this{,} the present work deals with the surface and foaming properties of aqueous solutions of a non-switchable surfactant in presence of a CO2-switchable additive. A 1 : 1 and a 1 : 5 (molar ratios) mixture of the non-switchable surfactant C14TAB (tetradecyltrimethylammonium bromide) and the CO2-switchable additive TMBDA (N{,}N{,}N{,}N-tetramethyl-1{,}4-butanediamine) were investigated. It was found that surface properties{,} foamability{,} and foam stability can be changed by switching the additive with CO2 as a trigger. This observation can be explained by the fact that TMBDA is surface active in its unprotonated{,} i.e. neutral form{,} which disturbs the tight packing of the surfactant molecules on the surface. As a consequence{,} foams generated with surfactant solutions containing the neutral TMBDA are less stable than their TMBDA-free counterparts. On the other hand{,} the switched diprotonated additive is a 2 : 1 electrolyte with hardly any surface activity and thus does not affect surface and foam properties.}, added-at = {2023-04-26T12:25:34.000+0200}, author = {Benedix, Robin R. and Botsch, Sophia and Preisig, Natalie and Kovalchuk, Volodymyr and Jessop, Philip G. and Stubenrauch, Cosima}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/22cb6287b7188bef85130103f2f6e5f91/nataliepreisig}, description = {Influence of a CO2-switchable additive on the surface and foaming properties of a cationic non-switchable surfactant - Soft Matter (RSC Publishing)}, doi = {10.1039/D3SM00273J}, interhash = {539de7635d90cf068cd3dc96a409f59c}, intrahash = {2cb6287b7188bef85130103f2f6e5f91}, journal = {Soft Matter}, keywords = {benedix myown stubenrauch}, number = 16, pages = {2941-2948}, publisher = {The Royal Society of Chemistry}, timestamp = {2023-04-26T12:25:34.000+0200}, title = {Influence of a CO2-switchable additive on the surface and foaming properties of a cationic non-switchable surfactant}, url = {http://dx.doi.org/10.1039/D3SM00273J}, volume = 19, year = 2023 }