Encapsulation of ionic liquid BMIm[PF6] within polyurea microspheres

Weiss, Ester; Gertopski, Diana; Gupta, Maneesh K.; Abu‐Reziq, Raed

doi:10.1016/j.reactfunctpolym.2015.09.003

Cited by 21 publications

(19 citation statements)

References 64 publications

(82 reference statements)

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“…However, one of the main drawback for the application of SILP materials in gas separation processes is the limited amount of IL uploaded onto the support (generally lower than 20% w/w [45], reaching up to 50% w/w in some cases [40,46]), that limits their application in gas separation processes. In this context, the new concept of encapsulated ionic liquids (ENILs) has arisen as an interesting alternative [47][48][49][50][51][52][53]. In a pioneer work, Deng et al synthesized a highly dispersed IL material through the physical encapsulation of the IL in a silica-gel matrix through a sol-gel process, thus reaching IL contents from 8 to 53 % w/w [47].…”

Section: Introductionmentioning

confidence: 99%

Ammonia capture from the gas phase by encapsulated ionic liquids (ENILs)

et al. 2016

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Encapsulated ionic liquids (ENILs) based on carbonaceous submicrocapsuleswere designed, synthesized and applied to the sorption of NH 3 from gas stream. The ENILs were prepared using three different task-specific ILs with adequate properties for NH 3 capture: 1-2(-hydroxyethyl)-3-methylimadazolium tetrafluoroborate (EtOHmimBF 4 ), choline bis(trifluoromethylsulfonyl)imide (CholineNTf 2 ) and tris(2hydroxyethyl)-methylammoniummethylsulfate [(EtOH) 3 MeNMeSO 4 ]. The ENILs synthesized were analyzed by different techniques to assess their morphology, chemical composition, porous structure and thermal stability. The capture of NH 3 was tested in fixed-bed experiments under atmospheric pressure. The influence of the type and load of IL, temperature (30, 45 and 60 ºC) and NH 3 inlet concentration was analyzed.Desorption of NH 3 from the exhausted ENILs was also studied at atmospheric pressure and temperatures in the range of 150 to 200 ºC. The ENILs prepared with task-specific ILs were found to be suitable for NH 3 capture in the fixed-bed operation. These systems can be a promising alternative to conventional absorption or adsorption due to: i) high sorption capacity controlled by IL selection, ii) remarkable mass transfer rate, iii) low 2 sensitiveness to high temperatures of the gas stream, iv) fast and complete regeneration of the exhausted ENIL at mild conditions; and v) recovery of NH 3 .

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Section: Introductionmentioning

confidence: 99%

Ammonia capture from the gas phase by encapsulated ionic liquids (ENILs)

et al. 2016

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“…This enables complex formulations of shell materials, as component monomers can be added through both the disperse and continuous phases. 42 Because of this, the materials selection process is less restrictive relative to solvent evaporation. Additionally, the plethora of polymeric materials currently available paves the way towards the systematic evaluation of changes in shell chemistry/structure on functional properties (e.g., gas permeability, mechanical properties), while providing opportunities for shell optimization.…”

Section: Emulsion Polymerizationmentioning

confidence: 99%

“…The same authors later reported the encapsulation of [BMIM][PF 6 ] in polyurea shells by emulsication and interfacial polymerization. 42,113 The dissolution of platinum acetylacetonate or cinchonine in the pre-emulsied IL enabled the authors to use the capsules as microreactors for hydrosilylation and Michael addition reactions. Due to capsule cracking during the rst catalytic cycle, 42 the authors subsequently encapsulated the same IL in polyurethane shells, which did not undergo any change in morphology during their use as microreactors for Michael addition reactions.…”

Section: Microreactorsmentioning

confidence: 99%

Engineering encapsulated ionic liquids for next-generation applications

Yan

Mangolini

2021

RSC Adv.

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“…These MCs are considered valuable owing to their unique features, such as low Tg, rubbery characteristics, as well as their chemical [ 61 ] and mechanical [ 60 ] stability and biocompatibility, [ 63 ] which make them an ideal material for holding liquid in their core even for in vitro applications. In addition to the encapsulation of ionic liquids, which was demonstrated by our group [ 64 ], phase change materials [ 65 ] and more common organic solvents, such as xylene [ 66 ], were found to serve as an efficient platform for implementing PU MCs. The encapsulation process in the latter examples was preceded by an oil-in-water (o/w) emulsification process.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Poly(ethylene glycol)@Polyurea Microcapsules Using Oil/Oil Emulsions and Their Application as Microreactors

2021

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The development process of catalytic core/shell microreactors, possessing a poly(ethylene glycol) (PEG) core and a polyurea (PU) shell, by implementing an emulsion-templated non-aqueous encapsulation method, is presented. The microreactors’ fabrication process begins with an emulsification process utilizing an oil-in-oil (o/o) emulsion of PEG-in-heptane, stabilized by a polymeric surfactant. Next, a reaction between a poly(ethylene imine) (PEI) and a toluene-2,4-diisocyanate (TDI) takes place at the boundary of the emulsion droplets, resulting in the creation of a PU shell through an interfacial polymerization (IFP) process. The microreactors were loaded with palladium nanoparticles (NPs) and were utilized for the hydrogenation of alkenes and alkynes. Importantly, it was found that PEG has a positive effect on the catalytic performance of the developed microreactors. Interestingly, besides being an efficient green reaction medium, PEG plays two crucial roles: first, it reduces the palladium ions to palladium NPs; thus, it avoids the unnecessary use of additional reducing agents. Second, it stabilizes the palladium NPs and prevents their aggregation, allowing the formation of highly reactive palladium NPs. Strikingly, in one sense, the suggested system affords highly reactive semi-homogeneous catalysis, whereas in another sense, it enables the facile, rapid, and inexpensive recovery of the catalytic microreactor by simple centrifugation. The durable microreactors exhibit excellent activity and were recycled nine times without any loss in their reactivity.

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Encapsulation of ionic liquid BMIm[PF6] within polyurea microspheres

Cited by 21 publications

References 64 publications

Ammonia capture from the gas phase by encapsulated ionic liquids (ENILs)

Ammonia capture from the gas phase by encapsulated ionic liquids (ENILs)

Engineering encapsulated ionic liquids for next-generation applications

Preparation of Poly(ethylene glycol)@Polyurea Microcapsules Using Oil/Oil Emulsions and Their Application as Microreactors

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