Thermo-responsive superhydrophobic paper using nanostructured cellulose stearoyl ester
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Hydrophilic paper was rendered with hydrophobic and superhydrophobic property after the treatment with solutions and nanoparticles of cellulose stearoyl ester (CSE), respectively. Cellulose stearoyl ester with a degree of substitution of 2.99 was synthesized from cellulose using stearoyl chloride. By dip-coating paper in CSE solution of at least 3 mg/ml in toluene, paper became hydrophobic with stable water contact angles of more than 120°. After further spray-coating using CSE nanoparticles that were prepared from CSE solution via nanoprecipitation, paper surface became superhydrophobic with water contact angles of larger than 150°. These superhydrophobic surfaces also exhibited self-cleaning character. Furthermore, the superhydrophobic paper surfaces showed a temperature-responsive character and could be turned hydrophobic after a heat-treatment at 70 °C for 5 min.
KeywordsPaper Superhydrophobic Cellulose Stearoyl ester Thermo-responsive
The financial support from LOEWE–Cluster Soft Control is gratefully acknowledged. We thank Prof. Jörg Schneider for the access to Nanosizer S. Dr. Longquan Chen is acknowledged for the kind support by the measurement of advancing and receding angles.
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