• • Antibacterial efficacy against Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus was evaluated via colony morphology on A16Se+xPDMS versus pristine PDMS (Figure 6A), with SEM confirming adhesion differences after 3 h of interaction (Figure 6B); this matters because Pseudomonas is a dominant marine biofilm former and its inclusion addresses the reviewer's demand for relevant fouling targets.
• • Chlorella adhesion was quantified by fluorescence microscopy and fluorescence intensity (Figure 6C, 6D), providing a direct microalgal fouling metric; reduced intensity on A16Se+xPDMS indicates lower biomass retention, which is industrially significant because microalgal slimes initiate the conditioning layer that precedes macrofouling.
• • Zeta potential measurements (Figure 6E) characterize surface charge for pristine PDMS and the A16Se+xPDMS series; charge modulation is mechanistically linked to reduced electrostatic attraction of fouling organisms, a parameter that can be tuned without altering bulk mechanical properties.
• • Seawater immersion panels were imaged after 3 months (Figure 6F), demonstrating field-relevant durability; this duration exceeds typical accelerated laboratory assays and provides evidence that the selenonium-catalyzed network does not degrade catastrophically under saline exposure, a prerequisite for any antifouling coating.