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Supporting information for Zwitterionic Antifouling Coatings for the Purification of High-Salinity Shale Gas Produced Water Rong Yang†, Esma Goktekin‡, and Karen K. Gleason†* †Department of Chemical Engineering, Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, Massachusetts, 02139 (USA) ‡ Department of Chemical Engineering, Northeastern University Boston, MA 02115, USA KEYWORDS. Zwitterion, chemical vapor deposition, antifouling, water purification, hydraulic fracturing, shale gas produced water. Table S1. Areas of peaks representing zwitterionic group and pyridine ring in Fourier transform infrared (FTIR) spectra taken with transmission and attenuated total reflectance (ATR) modes. Functional group Zwitterion Pyridine ring Transmission 0.05 0.05 ATR 1.76 0.02 Table S2. Thicknesses of polymer thin films with various cross-linking densities under dry and swollen states measured using in situ ellipsometry. Dry thickness/nm DVB pVD2 pVD1 p4VP 41.1 123.7 206.8 82.3 131.2 194.2 350.1 359.8 405.0 292.3 332.7 343.5 Thickness in DI water/nm 43.5 123.2 210.7 87.9 133.7 210.3 430.0 385.8 467.4 326.2 417.9 388.2 Thickness in salt water/nm 40.8 124.1 212.5 87.2 139.7 209.8 412.5 387.3 465.6 n.a. n.a. n.a.