Materials and Reagents. Alumina NPs (Aeroxide-Alu), perfluorotetradecanoic
acid, 9H-hexadecafluorononanoic acid, stearic acid,
2-propanol, and ethanol were purchased from Sigma-Aldrich and used
as received. Isostearyl acids were obtained from Nissan Chemical
Industries and used without further purification. Distilled water
(Millipore, 15 MΩ cm) was used throughout the experimental process