The Superhydrophobic and Oleophobic Material Constructed with γ-AlOOH Micro-Nanostructure

Authors：Chen, Menglong; Ma, Rui; Jiang, Qi^*

Source：NANO, 2022, 17(07): 2250054.

DOI：10.1142/S1793292022500540

• gamma-AlOOH
• superhydrophobic and oleophobic
• micro-nanostructure
• reaction condition
• surface hydroxyl group

Inorganic micro-nanomaterial is an excellent choice for constructing the functional surface of liquid repellency. In this work, gamma-AlOOH micro-nanostructure with special morphology was prepared by a simple hydrothermal method using common feedstock. Stearic acid was used as a hydrophobic modifier to obtain the superhydrophobic and oleophobic surface with good durability. Stearic acid molecule and gamma-AlOOH are connected by both physical and chemical adsorption, which is more conducive to improve structure stability. The water contact angle and diiodomethane contact angle of the film could reach up to 162:8 degrees and 134:8 degrees, respectively. Both morphology and composition of gamma -AlOOH are affected effciently by the valence anions in hydrothermal reaction. Reaction conditions including reaction time, substrate and surfactant have a great influence on the morphology and wetting performance of gamma -AlOOH structure. The surface hydroxyl group on substrate surface plays a guidance and orientation role in the growth of micronanostructure. The surface wettability depends on its roughness. The superhydrophobic and oleophobic gamma -AlOOH surface prepared with a simple method and cheap raw material has broad application prospect.