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. Author manuscript; available in PMC: 2018 Jan 24.
Published in final edited form as: ACS Nano. 2017 Jan 11;11(1):797–805. doi: 10.1021/acsnano.6b07196

Figure 1.

Figure 1

(a) Chemical structure of the studied PemFE molecule with the CEST MRI signal originating from the aromatic amine exchangeable proton on Pem (blue). A possible PemFE structural isomer conjugation site is indicated by an asterisk (*). (b) CEST contrast is measured by a decrease in water signal when the selectively saturated 5.2 ppm exchangeable proton is within supramolecular filaments and hydrogels. (c) Schematic illustration of the self-assembly of PemFE monomers into filamentous nanostructures that can further entangle into a 3D network for formation of self-supporting hydrogels under suitable conditions (pH, concentration, and ionic strength).