Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> in Silica Material SBA-15 Using NMR
The molecular dynamics of 1-butyl-3-methyl imidazolium tricyanomethanide ionic liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> confined in SBA-15 mesoporous silica were examined using <sup>1</sup>H NMR spin-lattice (T<sub>1</sub>) relaxation and diffusion m...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/24/7/6739 |
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| author | Lydia Gkoura Nikolaos Panopoulos Marina Karagianni George Romanos Aris Chatzichristos George Papavassiliou Jamal Hassan Michael Fardis |
| author_facet | Lydia Gkoura Nikolaos Panopoulos Marina Karagianni George Romanos Aris Chatzichristos George Papavassiliou Jamal Hassan Michael Fardis |
| author_sort | Lydia Gkoura |
| collection | DOAJ |
| description | The molecular dynamics of 1-butyl-3-methyl imidazolium tricyanomethanide ionic liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> confined in SBA-15 mesoporous silica were examined using <sup>1</sup>H NMR spin-lattice (T<sub>1</sub>) relaxation and diffusion measurements. An extensive temperature range (100 K–400 K) was considered in order to study both the liquid and glassy states. The hydrogen dynamics in the two states and the self-diffusion coefficients of the cation [BMIM]<sup>+</sup> above the glass transition temperature were extracted from the experimental data. The results were then compared to the corresponding bulk substance. The effects of confinement on the dynamic properties of the ionic liquid clearly manifest themselves in both temperature regimes. In the high-temperature liquid state, the mobility of the confined cations reduces significantly compared to the bulk; interestingly, confinement drives the ionic liquid to the glassy state at a higher temperature <i>T</i><sub>g</sub> than the bulk ionic liquid, whereas an unusual T<sub>1</sub> temperature dependence is observed in the high-temperature regime, assigned to the interaction of the ionic liquid with the silica-OH species. |
| first_indexed | 2024-03-11T05:33:55Z |
| format | Article |
| id | doaj.art-8708fd10a3224799bdd594633d41549d |
| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-11T05:33:55Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Molecular Sciences |
| spelling | doaj.art-8708fd10a3224799bdd594633d41549d2023-11-17T16:55:22ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672023-04-01247673910.3390/ijms24076739Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> in Silica Material SBA-15 Using NMRLydia Gkoura0Nikolaos Panopoulos1Marina Karagianni2George Romanos3Aris Chatzichristos4George Papavassiliou5Jamal Hassan6Michael Fardis7Institute of Nanoscience & Nanotechnology, NCSR Demokritos, Aghia Paraskevi, 15310 Athens, GreeceInstitute of Nanoscience & Nanotechnology, NCSR Demokritos, Aghia Paraskevi, 15310 Athens, GreeceInstitute of Nanoscience & Nanotechnology, NCSR Demokritos, Aghia Paraskevi, 15310 Athens, GreeceInstitute of Nanoscience & Nanotechnology, NCSR Demokritos, Aghia Paraskevi, 15310 Athens, GreeceInstitute of Nanoscience & Nanotechnology, NCSR Demokritos, Aghia Paraskevi, 15310 Athens, GreeceInstitute of Nanoscience & Nanotechnology, NCSR Demokritos, Aghia Paraskevi, 15310 Athens, GreeceDepartment of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab EmiratesInstitute of Nanoscience & Nanotechnology, NCSR Demokritos, Aghia Paraskevi, 15310 Athens, GreeceThe molecular dynamics of 1-butyl-3-methyl imidazolium tricyanomethanide ionic liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> confined in SBA-15 mesoporous silica were examined using <sup>1</sup>H NMR spin-lattice (T<sub>1</sub>) relaxation and diffusion measurements. An extensive temperature range (100 K–400 K) was considered in order to study both the liquid and glassy states. The hydrogen dynamics in the two states and the self-diffusion coefficients of the cation [BMIM]<sup>+</sup> above the glass transition temperature were extracted from the experimental data. The results were then compared to the corresponding bulk substance. The effects of confinement on the dynamic properties of the ionic liquid clearly manifest themselves in both temperature regimes. In the high-temperature liquid state, the mobility of the confined cations reduces significantly compared to the bulk; interestingly, confinement drives the ionic liquid to the glassy state at a higher temperature <i>T</i><sub>g</sub> than the bulk ionic liquid, whereas an unusual T<sub>1</sub> temperature dependence is observed in the high-temperature regime, assigned to the interaction of the ionic liquid with the silica-OH species.https://www.mdpi.com/1422-0067/24/7/6739confined ionic liquidsNMRrelaxation and diffusionmesoporous silica SBA-15 |
| spellingShingle | Lydia Gkoura Nikolaos Panopoulos Marina Karagianni George Romanos Aris Chatzichristos George Papavassiliou Jamal Hassan Michael Fardis Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> in Silica Material SBA-15 Using NMR International Journal of Molecular Sciences confined ionic liquids NMR relaxation and diffusion mesoporous silica SBA-15 |
| title | Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> in Silica Material SBA-15 Using NMR |
| title_full | Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> in Silica Material SBA-15 Using NMR |
| title_fullStr | Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> in Silica Material SBA-15 Using NMR |
| title_full_unstemmed | Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> in Silica Material SBA-15 Using NMR |
| title_short | Investigation of Dynamic Behavior of Confined Ionic Liquid [BMIM]<sup>+</sup>[TCM]<sup>−</sup> in Silica Material SBA-15 Using NMR |
| title_sort | investigation of dynamic behavior of confined ionic liquid bmim sup sup tcm sup sup in silica material sba 15 using nmr |
| topic | confined ionic liquids NMR relaxation and diffusion mesoporous silica SBA-15 |
| url | https://www.mdpi.com/1422-0067/24/7/6739 |
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