Urea derivatives that were substituted with a 2‐benzylphenyl group and an alkyl group functioned as low molecular weight gelators for various organic solvents and ionic liquids. Urea derivatives with long alkyl chains were effective for the gelation of polar solvents. However, they were not suitable for the gelation of non‐polar solvents, whereas urea derivatives with short alkyl chains were effective. Ionic liquids were similar to polar solvents in that urea derivatives with long alkyl chains were the most effective gelators. The physical properties of the formed supramolecular gels were analyzed by dynamic viscoelasticity measurements using a rheometer.
Urea derivatives that were substituted with a 2‐benzylphenyl group and an alkyl group function as low‐molecular‐weight gelators for various organic solvents and ionic liquids. Those with long alkyl chains are effective for the gelation of polar solvents. However, they are not suitable for the gelation of non‐polar solvents, whereas urea derivatives with short alkyl chains are effective. Ionic liquids are similar to polar solvents in that urea derivatives with long alkyl chains are the most effective gelators. More information can be found in the Full Paper by Masamichi Yamanaka et al.
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