Figure 10.

(a) Measured enhancement of calcite {104} step speeds as a function of log peptoid concentration. Normalized propagation rates are shown as the ratio of step velocities in the presence (v) and absence (v₀) of peptoids. (b) Reverse phase HPLC data to show the relative peptoid hydrophobicities, where longer retention time indicates higher hydrophobicity. Peptoids that efficiently promote calcite crystal growth have retention times of 14–15 min (47%–50% CH₃CN in H₂O at 1.0 mL/min flow rate).