Heteropoly acids-functionalized Janus particles as catalytic emulsifier for heterogeneous acylation in flow ionic liquid-in-oil Pickering emulsion

Tang, Xiuping; Hou, Yu; Meng, Qing; Zhang, Guolin; Liang, Fuxin; Song, Xi‐Ming

doi:10.1016/j.colsurfa.2019.02.066

Cited by 22 publications

(21 citation statements)

References 45 publications

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“…47 Tang and co-workers carried out a Friedel-Crafts reaction in a continuous flow IL/o Pickering emulsion. 43 Again, the flow Pickering emulsion showed a relatively higher conversion than that obtained with batch systems of the stir-free and stirred IL/o Pickering emulsion. In order to explore the effect of emulsion droplet size in the reaction, droplet sizes were tuned by changing the amount of IL.…”

Section: Pickering Emulsions In Flowmentioning

confidence: 88%

“…36 Although water is a recognized green solvent, it still has many limitations such as low solubility for organic substrates, low tolerance for water-sensitive compounds/reactions and a low boiling point. 43 As an alternative to the classical green solvents, ILs have emerged as potential candidates in Pickering emulsion systems for catalysis due to the following reasons: (i) they are environmentally benign non-aqueous solvents with high thermal and chemical stability and low saturated vapor pressure, 44 (ii) they have good solvent properties towards both ionic and covalent compounds and enzymes, (iii) their tunable structure and properties enables them to be used in a wide range of reactions and (iv) they are immiscible with some nonpolar solvents which allows the formation of emulsion droplets upon homogenisation. ILs have been identified as efficient catalysts for the cyanosilylation of carbonic compounds.…”

Section: Liquids Used In Pickering Emulsions For Catalysismentioning

confidence: 99%

“…47 ILs can even in some cases enhance the selectivity of a reaction. 43,45,46,48 Tao et al carried out the hydroformylation of long chain alkenes in an IL/o Pickering emulsion system. 48 The overall catalytic performance was superior to that of a w/o system.…”

Section: Liquids Used In Pickering Emulsions For Catalysismentioning

confidence: 99%

“…Flow Pickering emulsion systems usually encapsulate catalysts in the droplets, so care should be taken in continuous flow processes as the continuous phase may extract the catalysts to some degree and consequently affect the catalytic performance. 43 In ref. 55 a w/o emulsion was first prepared with hydrophilic silica nanospheres modified with methyltrimethoxysilane and then the emulsion was packed in a column (Fig.…”

Section: Pickering Emulsions In Flowmentioning

confidence: 99%

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Catalysis in Pickering emulsions

2020

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Section: Pickering Emulsions In Flowmentioning

confidence: 88%

Section: Liquids Used In Pickering Emulsions For Catalysismentioning

confidence: 99%

Section: Liquids Used In Pickering Emulsions For Catalysismentioning

confidence: 99%

Section: Pickering Emulsions In Flowmentioning

confidence: 99%

See 2 more Smart Citations

Catalysis in Pickering emulsions

2020

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“…One of the easiest methods to recover (Janus) particles from a liquid medium is the centrifugation of these particles, as shown by many groups [8,[63][64][65][66][67][68][69][70][71][72]. However, this approach lacks in its applicability, since only very limited volumes can be treated.…”

Section: Recovery and Recycling Of Janus Particlesmentioning

confidence: 99%

Janus particles: from concepts to environmentally friendly materials and sustainable applications

2020

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Janus particles represent a unique group of patchy particles combining two or more different physical or chemical functionalities at their opposite sides. Especially, individual Janus particles (JPs) with both chemical and geometrical anisotropy as well as their assembled layers provide considerable advantages over the conventional monofunctional particles or surfactant molecules offering (a) a high surface-to-volume ratio; (b) high interfacial activity; (c) target controlling and manipulation of their interfacial activity by external signals such as temperature, light, pH, or ionic strength and achieving switching between stable emulsions and macro-phase separation; (d) recovery and recycling; (e) controlling the mass transport across the interface between the two phases; and finally (f) tunable several functionalities in one particle allowing their use either as carrier materials for immobilized catalytically active substances or, alternatively, their site-selective attachment to substrates keeping another functionality active for further reactions. All these advantages of JPs make them exclusive materials for application in (bio-)catalysis and (bio-)sensing. Considering "green chemistry" aspects covering biogenic materials based on either natural or fully synthetic biocompatible and biodegradable polymers for the design of JPs may solve the problem of toxicity of some existing materials and open new paths for the development of more environmentally friendly and sustainable materials in the very near future. Considering the number of contributions published each year on the topic of Janus particles in general, the number of contributions regarding their environmentally friendly and sustainable applications is by far smaller. This certainly pinpoints an important challenge and is addressed in this review article. The first part of the review focuses on the synthesis of sustainable biogenic or biocompatible Janus particles, as well as strategies for their recovery, recycling, and reusability. The second part addresses recent advances in applications of biogenic/biocompatible and non-biocompatible JPs in environmental and biotechnological fields such as sensing of hazardous pollutants, water decontamination, and hydrogen production. Finally, we provide implications for the rational design of environmentally friendly and sustainable materials based on Janus particles.

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Multiphase Microreactors Based on Liquid–Liquid and Gas–Liquid Dispersions Stabilized by Colloidal Catalytic Particles

Dedovets

Leclercq

et al. 2021

Angewandte Chemie

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Pickering emulsions, foams, bubbles, and marbles are dispersions of two immiscible liquids or of a liquid and a gas stabilized by surface‐active colloidal particles. These systems can be used for engineering liquid–liquid–solid and gas–liquid–solid microreactors for multiphase reactions. They constitute original platforms for reengineering multiphase reactors towards a higher degree of sustainability. This Review provides a systematic overview on the recent progress of liquid–liquid and gas–liquid dispersions stabilized by solid particles as microreactors for engineering eco‐efficient reactions, with emphasis on biobased reagents. Physicochemical driving parameters, challenges, and strategies to (de)stabilize dispersions for product recovery/catalyst recycling are discussed. Advanced concepts such as cascade and continuous flow reactions, compartmentalization of incompatible reagents, and multiscale computational methods for accelerating particle discovery are also addressed.

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Heteropoly acids-functionalized Janus particles as catalytic emulsifier for heterogeneous acylation in flow ionic liquid-in-oil Pickering emulsion

Cited by 22 publications

References 45 publications

Catalysis in Pickering emulsions

Catalysis in Pickering emulsions

Janus particles: from concepts to environmentally friendly materials and sustainable applications

Multiphase Microreactors Based on Liquid–Liquid and Gas–Liquid Dispersions Stabilized by Colloidal Catalytic Particles

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