Mesoporous and biocompatible surface active silica aerogel synthesis using choline formate ionic liquid

Meera, K.; Sankar, Rajavelu Murali; Jaisankar, Sellamuthu N.; Mandal, Asit Baran

doi:10.1016/j.colsurfb.2011.04.011

Cited by 35 publications

(22 citation statements)

References 41 publications

(42 reference statements)

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“…The average pore size and ionic liquid content in the gel have a direct relation with each other and hence the presence of IL inside the gel increases the pore radius to a higher value. 35 On the other hand, the results show that the addition of protic ionic liquids decreased the specific surface area for ENIL in relation to silica aerogel with IL (SAIL), in agreement with results reported by Souza and colleagues 12 for a BC commercial lipase and PILs. This is possibly because of the partial adsorption of the enzyme on the external surface of the hydrophobic matrix.…”

Section: Specific Surface Area and Porous Propertiessupporting

confidence: 82%

“…The SA with protic ionic liquid showed a type IV isotherm with a hysteresis loop (Figure 4a), which are typically exhibited by mesoporous solids. 35 The results observed for SAIL in the N 2 adsorption-desorption tests concur with those of the isotherms with H1 hysteresis loops, which is a characteristic of mesoporous materials and usually associated with pores with narrow necks and wide bodies (Figure 4b). Similar results were obtained for the immobilized lipase samples, which all showed a type IV isotherm with hysteresis loop H1.…”

Section: Specific Surface Area and Porous Propertiessupporting

confidence: 75%

“…4 Thermogravimetric analysis showed that all the gel samples exhibit more weight loss up to 100 °C, which corresponds to the evaporation of alcohol and residual water formed during the hydrolysis of -Si-OCH 2 CH 3 functionalities and condensation of silanol (-Si-OH) groups. 35 It was observed that the SA sample showed a weight loss of approximately 17%. In all cases, gels were heated up to 800 °C (data shown up to 500 °C) and the weight loss was negligible.…”

Section: Thermogravimetric Analysis -Tgmentioning

confidence: 99%

See 2 more Smart Citations

The Novel Mesoporous Silica Aerogel Modified With Protic Ionic Liquid for Lipase Immobilization

Barbosa¹,

Lisboa²,

Silva³

et al. 2016

Química Nova

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Recebido em 24/08/2015; aceito em 22/12/2015; publicado na web em 11/02/2016Mesoporous silica supports (aerogels) were used to immobilize Burkholderia cepacia lipase (BC) by encapsulation (EN or ENIL), physical adsorption (ADS or ADSIL) and covalent binding (CB or CBIL) into or onto the aerogel modified with protic ionic liquid (PIL). Yield immobilization (Ya) and operational stability were determined by the hydrolytic reaction of olive oil. Ya (37% to 83% by physical adsorption) and operational stability (2 to 23 batches by encapsulation) increased when the support was modified with PIL. For immobilized derivates observed by the BET method, in this case ADS and CB for ADSIL and CBIL, increased pores size was observed, possibly due to the higher amount of BC immobilized conferring Ya and operational stability. This effect was probably attributed to the entry of the enzyme into the pores of the silica aerogel structure. SEM images showed a change in the structure and properties of immobilized lipase derived with PIL. A characteristic FTIR band was obtained for the silanol groups and amides I, IV and V, demonstrating the efficiency of immobilization of BC. The most efficient biocatalysts were ADSIL with regard to yield immobilization and ENIL for operational stability.

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Section: Specific Surface Area and Porous Propertiessupporting

confidence: 82%

Section: Specific Surface Area and Porous Propertiessupporting

confidence: 75%

Section: Thermogravimetric Analysis -Tgmentioning

confidence: 99%

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The Novel Mesoporous Silica Aerogel Modified With Protic Ionic Liquid for Lipase Immobilization

Barbosa¹,

Lisboa²,

Silva³

et al. 2016

Química Nova

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“…4,5 Their range of potential applications extends from the alreadymentioned usage as solvents and catalysts to media for electrochemical applications and biosensors. [6][7][8][9] ILs have also been considered for utilisation in analytical [10][11][12][13] or supercritical fluid applications, 14 gel production 15 or as pharmaceutical ingredients. 16,17 Their application as agents for recovery, extraction and purification purposes [18][19][20] or as lubricants 21 and hypergolic rocket fluid 22 is also being discussed.…”

Section: Ionic Liquidsmentioning

confidence: 99%

Biodegradability of 27 pyrrolidinium, morpholinium, piperidinium, imidazolium and pyridinium ionic liquid cations under aerobic conditions

et al. 2014

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The chemical and thermal stability of ionic liquids (ILs) makes them interesting for a large variety of applications in nearly all areas of the chemical industry. However, this stability is often reflected in their recalcitrance towards biodegradation, which comes with the risk of persistence when they are released into the environment. In this study we carried out a systematic investigation of the biodegradability of pyrrolidinium, morpholinium, piperidinium, imidazolium and pyridinium-based IL cations substituted with different alkyl or functionalised side chains and using halide counterions. We examined their primary degradability by specific analysis and/or their ultimate biodegradability using biochemical oxygen demand tests according to OECD guideline 301F. Biological transformation products were investigated using mass spectrometry. A comparison of the biodegradation potential of these ILs shows that for all five head groups, representatives can be found that are readily or inherently biodegradable, thus permitting the structural design of ILs with a reduced environmental hazard. † Electronic supplementary information (ESI) available. See

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“…Fig. 4), the first loss of mass (9.5 ± 1.5% to 12.2 ± 1.5%) occurs between 29 °C and 150 °C and corresponds to water and solvent organic evaporation [48]. The second mass loss (35.8 ± 1.5% to 14.2 ± 1.5%) observed occurs between 258 °C and 436 °C attributed to the decomposition of the IL BMIM Cl and/or PVA [49,50].…”

Section: Raman Spectroscopy and Solid-state 13 C And 29 Si Nmr Analysesmentioning

confidence: 93%

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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Mesoporous and biocompatible surface active silica aerogel synthesis using choline formate ionic liquid

Cited by 35 publications

References 41 publications

The Novel Mesoporous Silica Aerogel Modified With Protic Ionic Liquid for Lipase Immobilization

The Novel Mesoporous Silica Aerogel Modified With Protic Ionic Liquid for Lipase Immobilization

Biodegradability of 27 pyrrolidinium, morpholinium, piperidinium, imidazolium and pyridinium ionic liquid cations under aerobic conditions

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

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