The adsorption behavior of MA-11-2-11-MA at the solid-liquid interface play a critical role in the formation of the bilayer and the synthesis of net-poly(MA-11-2-11-MA). The adsorption isotherm of MA-11-2-11-MA at 65°C was studied with monocrystalline silicon powder (10 mg/ml), which had the same surface properties with the silicon wafer but a much larger specific surface area (21 m2/g, according to the N2 absorption-desorption isotherms obtained on a Quantachrome Nova 4200e at 77 K). The adsorption of MA-11-2-11-MA was detected by measuring the concentration change (ΔC) in solution using 1H NMR (with an external standard capillary of DSS, 4,4-dimethyl-4-silapentane-1-sulfonic acid). The adsorption curve (fig. S1B), which is similar to that in the previous report (33), indicates the typical double-layer adsorption behavior of MA-11-2-11-MA on silicon powder. We calculate the packing density of MA-11-2-11-MA on silicon to be 3.81 molecule/nm2 at full packing condition (Cequ = 4.34 mM). The relatively high packing density indicates a tight arrangement of MA-11-2-11-MA on silicon surface.

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