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Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...

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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

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Photoactive PFA Coating through Fluorophilic Interactions for Continuous Flow Photochemistry.

Jesús Castro-Esteban¹, John H Dunlap^2,3, Benedikt S Schreib¹

¹Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

|December 26, 2025

Summary

We developed a new method to coat flow reactors with photocatalysts for efficient chemical reactions. The perfluoroalkoxy (PFA) coil reactors functionalized with poly-(p-phenylene ethynylene) polymers (PPEST) showed robust performance and high conversion rates.

Keywords:

fluorophilic interactions functionalized coil flow reactors perfluoroalkoxy (PFA)photocatalysts photochemistry

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A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

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Published on: April 10, 2019

Area of Science:

Chemical Engineering
Materials Science
Photocatalysis

Background:

Flow reactors are crucial for scalable chemical synthesis.
Conventional reactors face challenges in light penetration, catalyst immobilization, and separation.
Heterogeneous photocatalysis demands efficient reactor designs for improved performance.

Purpose of the Study:

To develop a robust methodology for functionalizing perfluoroalkoxy (PFA) coil reactors with fluorinated photocatalysts.
To evaluate the efficiency and stability of these functionalized reactors in continuous flow photocatalysis.
To identify the most effective photocatalyst coating for chemical synthesis in flow.

Main Methods:

Functionalization of PFA coil reactors using fluorophilic interactions with perylene diimide (F-PDI) and poly-(p-phenylene ethynylene) polymers (PPEST, POLPDI).
Continuous flow experiments utilizing the [2 + 2] photocycloaddition of 9-vinylcarbazole (VCZ).
In-line nuclear magnetic resonance (NMR) spectroscopy for real-time monitoring of VCZ conversion.

Main Results:

PPEST demonstrated the most robust photocatalyst coating among the studied materials.
High conversions of VCZ to 1,2-trans-dicarbazylcyclobutane (t-DCZCB) were achieved with varying lamp powers and residence times.
PPEST-functionalized reactors maintained stability and efficiency over 18 hours of continuous operation, with conversions ranging from 50-75%.

Conclusions:

Fluorophilic interactions provide an effective method for immobilizing photocatalysts in PFA coil reactors.
PPEST-functionalized PFA coil reactors offer a stable and efficient platform for continuous flow heterogeneous photocatalysis.
This approach enhances control, efficiency, and scalability for photochemical transformations.