The PDF file includes:

• Fig. S1. Chemical structure of oligomers formed during polydopamine coating under St-Bc pH conditions analyzed by HPLC-MS with a C18 column.
• Fig. S2. XPS analyses of polydopamine-coated TiO₂ surfaces after 1 hour of strong base treatment.
• Fig. S3. Maintenance of polydopamine coating on a TPU film in 0.1 N KOH (pH 12) solution for 1 hour.
• Fig. S4. Intercalation of NMe₄⁺ on polydopamine coating with pH variations.
• Fig. S5. Wettability of polydopamine-coated substrates in Md-Bc and St-Bc conditions in the presence and absence of 1 M choline, a precursor to neurotransmitter ACh.
• Fig. S6. Surface morphologies of the NMe₄⁺-intercalated polydopamine functionalized surfaces at St-Bc with 0.1 M NMe₄⁺ (top) and 1 M NMe₄⁺ (bottom) by SEM and atomic force microscopy analyses.

Download PDF

Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.mp4 format). Stability of polydopamine coating in NaOH, DDW, and KOH solution.