The microcapillary reactor used in this study is the open-source, 3D-printed Uflow reactor, as illustrated in Figure . This photoreactor system consists of a capillary coiled around a holder, along with a light source and fan, all housed within a casing. The holder and the interior of the casing are lined with reflective aluminum tape to maximize the incident photon flux on the reactor. The high-shear photoreactor used is the photo rotor-stator spinning disk reactor (pRS-SDR, shown in Figure ), which features a rotating disk enclosed in a closely fitting housing. The top section of the reactor is a quartz window, allowing for irradiation via an LED-based floodlight mounted in a stainless steel casing. 2