We analyzed the aggregation dynamics by monitoring the time evolution of the average node coordination (see the SI for further details), distinguishing between hydrophobic bonds and ionbridged contacts (see Figure and for the first microsecond of 1 representative simulation for each composition). All MUS NPs (Figure ) start forming ion-bridged contacts right away, while hydrophobic bonds increase at a slower rate. The trend is inverted for MUS:OT 2:1 NPs (Figure ), in which linear hydrophobic bonds form first, followed by inter-chain ion-bridged contacts. The same trend is even more pronounced for MUS:OT 1:1 NPs (Figure ), where only hydrophobic bonds increase initially, while ion-bridged contacts form once the ribbon aggregates are almost completed.