Revealing the pore characteristics and physicochemical properties of silica ionogels based on different sol-gel drying strategies

Çok, Selay Sert; Koç, Fatoş; Balkan, Firuz; Gi̇zli̇, Nilay

doi:10.1016/j.jssc.2019.07.038

Cited by 14 publications

(15 citation statements)

References 18 publications

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“…6b and c). Figures 5b, c, d, e, f and g 6d also shows the formation of open pores presenting a continuous channel of communication with sample external surface (d ~ 74 nm, indicated by yellow arrows) as described in literature [40,52].…”

Section: Morphological Analysis (Sem/tem)supporting

confidence: 66%

“…Condensed silica formation was confirmed by the presence of a broadband in the region from 1000 cm −1 to 1350 cm −1 as well as by the shoulder-shaped band in the region between the bands at 1079 cm −1 and 1199 cm −1 attributed to the asymmetrical elongation vibration of siloxane (Si-O-Si) bridges [42,46]. The bands at 790 cm −1 and 619 cm −1 are attributed to the v Si-O-Si symmetrical elongation vibration and the band at 949 cm −1 to the S-O bond oscillation indicating the successful silica network formation [40,42,46]. According to [46], the broadband in the region between 3650 and 2800 cm −1 can be attributed to the vibrational modes of asymmetric and symmetrical elongation of the residual and/or adsorbed water present in the samples, confirmed by the appearance of the band at 1639 cm −1 corresponding to the symmetrical flexion vibrations of the water.…”

Section: Structural Analysis-(ftir)mentioning

confidence: 97%

“…The IL presences make it difficult for the spheres to collapse during solvent evaporation, avoiding shrinkage and formation of a dense structure as shown in Fig. 5i for pristine SX [40,52,53].…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…In the last decades, several studies have reported the synthesis of aerogels and xerogels containing ionic liquids. These materials can be applied as support and enzymatic immobilizers [37], catalyst support [35,38], auxiliary materials for nanoparticle formation [39], molds for nanoporous and inorganic mesoporous materials preparation [38,40,41], and drug removal from wastewater [42]. In previous work, our group reported the synthesis of silica xerogels containing ILs for use in CO 2 sorption and CH 4 /CO 2 separation [43].…”

Section: Introductionmentioning

confidence: 99%

“…) attributed to the IL confinement and also open pores in the SX structure (Indicated by yellow arrows)[40,52,54].…”

mentioning

confidence: 99%

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Imidazolium-based ionic liquid silica xerogel as catalyst to transform CO2 into cyclic carbonate

et al. 2020

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In this work silica xerogel samples containing different imidazolium ILs (EMIM-CF 3 SO 3 , EMIM-MSO 3 , BMIM-Cl, MBMIM-TF 2 N, BMIM-TF 2 N and EMIM-TF 2 N) were synthesized, characterized and used as catalyst in cyclic carbonate synthesis. ILs mass percentage was varied from 5% to 25%. The effect fostered by the ILs mass variation in the synthesis of silica xerogel was observed both in the materials characterization as well as in the performance of these materials as solid catalysts in the cyclic carbonate synthesis from the cycloaddition reaction of CO 2 with propylene epoxide. The obtained silica xerogel samples (SXs) were characterized by FTIR, RAMAN, TGA, SEM and TEM. The selectivity of the cycloaddition reaction was analyzed by GC and 1 H and 13 C NMR. The best results were obtained for SX-EMIM MSO 3 (20% of IL) and SX-BMIM Cl (15% of IL) with propylene carbonate yields of 91.4% and 83.4% and selectivities >99% and 97.4% respectively.

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Section: Morphological Analysis (Sem/tem)supporting

confidence: 66%

Section: Structural Analysis-(ftir)mentioning

confidence: 97%

Section: Thermogravimetric Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…) attributed to the IL confinement and also open pores in the SX structure (Indicated by yellow arrows)[40,52,54].…”

mentioning

confidence: 99%

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Imidazolium-based ionic liquid silica xerogel as catalyst to transform CO2 into cyclic carbonate

et al. 2020

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The Role of Interfaces in Ionic Liquid‐Based Hybrid Materials (Ionogels) for Sensing and Energy Applications

Suen

Elumalai

Debnath

et al. 2022

Adv Materials Inter

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Ionogels have established themselves as an intriguing type of composites, owing to their distinctive properties, including superior thermal stability, non‐flammability, tunable electrochemical stability window, and high ionic conductivity. Hybrid materials based on ionic liquids (ionogels) are held together by interfaces arising out of intermolecular interactions, including electrostatic, van der Waals, solvophobic, steric, and hydrogen bonding. The interfaces within the ionic liquid (ILs) and its multifaceted interplay with the encapsulating matrix greatly influence the physicochemical and electronic/ionic interactions within the composite resulting in exceptional characteristics, allowing for the design of ionogels for targeted applications. Though ionogels have shown superior properties comparable to neat ILs, they still exhibit relatively low mechanical strength, limiting their application in several practical technologies. Simultaneous enhancement of mechanical durability while retaining high ionic conductivity is indispensable, which requires understanding interfaces and related influencing parameters. This review provides a synergetic comprehension, focusing on the interactive forces and factors affecting the conductivity, stability, and robustness of ionogels. Correlating with interfaces, several strategies, including the implications of nanofiller incorporation on the electromechanical properties of ionogel, are also elaborated. Finally, a primer is provided on the application of ionogels in sensors and energy harvesting technologies.

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Ionic Liquid Functionalized Silica Aerogels as Reinforcing Agents for Epoxy Nanocomposites

Çok

Ünal

Koç

et al. 2021

J Inorg Organomet Polym

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Revealing the pore characteristics and physicochemical properties of silica ionogels based on different sol-gel drying strategies

Cited by 14 publications

References 18 publications

Imidazolium-based ionic liquid silica xerogel as catalyst to transform CO2 into cyclic carbonate

Imidazolium-based ionic liquid silica xerogel as catalyst to transform CO2 into cyclic carbonate

The Role of Interfaces in Ionic Liquid‐Based Hybrid Materials (Ionogels) for Sensing and Energy Applications

Ionic Liquid Functionalized Silica Aerogels as Reinforcing Agents for Epoxy Nanocomposites

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