The percentage of all clogs found in the channels compared to the entire device is given by β . The quantity 100β indicates the percentage of bright pixels found in the inlet reservoir. As shown in Table , less than 15% of the fluorescent particles are found in the microchannels in cases where adhesive interactions are induced; the majority are located in the inlet reservoir. The particles deposit and clog in the inlet of the channels, and grow into the inlet reservoir (see Videos S1 and S3 in SI). However, this phenomenon is not observed in pristine flow tests, where more than 90% of the particles are located in the microchannels (Table ). Together, the measurements in Table provide evidence that adhesion observed in pristine flow tests occurs to a much lower degree, and is not due to aggregation or electrostatic attractions.