Evidence for an L3 phase in ternary deep eutectics : composition-induced L3-to-Lα transition of AOT
(2023) In Nanoscale 15(47). p.19314-19321- Abstract
Pure and hydrated deep eutectic solvents (DES) are proposed to form self-assembled nanostructures within the fluid bulk, similar to the bicontinuous L3 phase common for ionic liquids (ILs). Labelled choline chloride : urea : water DES were measured using small-angle neutron scattering (SANS), showing no long-range nanostructure. However, solutions of the surfactant AOT in this DES yielded scattering consistent with the L3 “sponge” phase, which was fitted using the Teubner-Strey model. A disclike model gave local structural information, namely, a linear increase in radius versus solvent water content (w = molar ratio of DES : water), eventually forming large, turbid lamellar phases at 10w; an... (More)
Pure and hydrated deep eutectic solvents (DES) are proposed to form self-assembled nanostructures within the fluid bulk, similar to the bicontinuous L3 phase common for ionic liquids (ILs). Labelled choline chloride : urea : water DES were measured using small-angle neutron scattering (SANS), showing no long-range nanostructure. However, solutions of the surfactant AOT in this DES yielded scattering consistent with the L3 “sponge” phase, which was fitted using the Teubner-Strey model. A disclike model gave local structural information, namely, a linear increase in radius versus solvent water content (w = molar ratio of DES : water), eventually forming large, turbid lamellar phases at 10w; an L3-to-Lα transition was observed. Simultaneous multi-contrast SANS fits show the surfactant headgroup region is dominated by interactions with poorly-soluble Na+ at low water contents, and numerically-superior [cholinium]+ as water content increases. The modified interfacial Gaussian curvature from cation : anion volume matching stabilizes the lamellar morphology, allowing the bilayer aggregation number to increase.
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- author
- Hammond, Oliver S. ; Elstone, Naomi S. ; Doutch, James ; Li, Peixun and Edler, Karen J. LU
- organization
- publishing date
- 2023-11-21
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Nanoscale
- volume
- 15
- issue
- 47
- pages
- 8 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- pmid:37997686
- scopus:85178647142
- ISSN
- 2040-3364
- DOI
- 10.1039/d3nr03689h
- language
- English
- LU publication?
- yes
- id
- 8acab5c7-42a8-4081-831a-6b59f17de3b0
- date added to LUP
- 2023-12-18 08:15:35
- date last changed
- 2024-04-16 20:29:55
@article{8acab5c7-42a8-4081-831a-6b59f17de3b0, abstract = {{<p>Pure and hydrated deep eutectic solvents (DES) are proposed to form self-assembled nanostructures within the fluid bulk, similar to the bicontinuous L<sub>3</sub> phase common for ionic liquids (ILs). Labelled choline chloride : urea : water DES were measured using small-angle neutron scattering (SANS), showing no long-range nanostructure. However, solutions of the surfactant AOT in this DES yielded scattering consistent with the L<sub>3</sub> “sponge” phase, which was fitted using the Teubner-Strey model. A disclike model gave local structural information, namely, a linear increase in radius versus solvent water content (w = molar ratio of DES : water), eventually forming large, turbid lamellar phases at 10w; an L<sub>3</sub>-to-L<sub>α</sub> transition was observed. Simultaneous multi-contrast SANS fits show the surfactant headgroup region is dominated by interactions with poorly-soluble Na<sup>+</sup> at low water contents, and numerically-superior [cholinium]<sup>+</sup> as water content increases. The modified interfacial Gaussian curvature from cation : anion volume matching stabilizes the lamellar morphology, allowing the bilayer aggregation number to increase.</p>}}, author = {{Hammond, Oliver S. and Elstone, Naomi S. and Doutch, James and Li, Peixun and Edler, Karen J.}}, issn = {{2040-3364}}, language = {{eng}}, month = {{11}}, number = {{47}}, pages = {{19314--19321}}, publisher = {{Royal Society of Chemistry}}, series = {{Nanoscale}}, title = {{Evidence for an L<sub>3</sub> phase in ternary deep eutectics : composition-induced L<sub>3</sub>-to-L<sub>α</sub> transition of AOT}}, url = {{http://dx.doi.org/10.1039/d3nr03689h}}, doi = {{10.1039/d3nr03689h}}, volume = {{15}}, year = {{2023}}, }