Interfacial Catalysis in Pickering Emulsion Systems

Interfacial catalysis in Pickering emulsion systems harnesses solid particles to stabilise droplets of one liquid dispersed in another, creating extensive oil–water interfaces that serve as active sites for chemical transformation. By immobilising catalysts—ranging from metal nanoparticles and metal–organic frameworks to enzymes and whole cells—at this interface, these systems achieve enhanced mass transfer, improved selectivity and simplified catalyst recovery. Recent innovations have introduced compartmentalised microreactors and responsive colloids that enable multi-step synthesis, on-demand demulsification and continuous flow processing. Such advances underscore the global significance of these platforms for sustainable fine-chemical production, biorefining and green manufacturing, marrying academic rigour with practical scalability.

Research from Nature Portfolio

Recent studies have demonstrated the power of biomimetic microreactors in continuous flow cascade catalysis. By organising distinct catalytic sub-compartments within Pickering emulsion droplets and packing them into column reactors, researchers have realised one-pot, multi-step chemo-enzymatic syntheses with up to two-orders-of-magnitude enhancements in rate and exceptional enantiocontrol over extended operation. In parallel, the development of artificial spores—Escherichia coli cells coated with protective polymers—has yielded robust whole-cell catalysts that both stabilise aqueous-organic emulsions and facilitate interfacial biocatalysis. This platform accommodates single-reaction and multi-enzyme cascades, and can be readily combined with metal catalysts for chemoenzymatic pathways, exemplifying a versatile approach to durable, high-performance catalysis.

Interfacial Catalysis in Pickering Emulsion Systems publication trend

The graph below shows the total number of articles in interfacial catalysis in pickering emulsion systems across all publications each year (not limited to Nature Index journals).

Technical terms

Pickering emulsion: An emulsion stabilised by colloidal particles instead of molecular surfactants, yielding robust droplet interfaces.

Interfacial catalysis: Chemical reactions catalysed at the interface between two immiscible phases, exploiting increased surface area for enhanced kinetics.

Cascade catalysis: Sequential catalytic transformations conducted in a single reactor without intermediate isolation, enabling streamlined synthesis.

Stimuli-responsive emulsifier: A particle or system whose emulsifying properties can be reversibly altered by external triggers, such as gas composition, temperature or pH.

Biomimetic microreactor: A droplet-based system that mimics cellular compartmentalisation to co-localise multiple catalysts for enhanced multi-step reactions.

References

1. Catalysis in Pickering emulsions. Soft Matter (2020).
2. Pickering emulsion droplet-based biomimetic microreactors for continuous flow cascade reactions. Nature Communications (2022).
3. Artificially sporulated Escherichia coli cells as a robust cell factory for interfacial biocatalysis. Nature Communications (2022).
4. CO 2 -responsive Pickering emulsions stabilized by soft protein particles for interfacial biocatalysis. Chemical Science (2022).
5. Pickering Emulsions Biocatalysis: Recent Developments and Emerging Trends. Small (2024).