Water and oil ultra-repellent structure and manufacturing method therefor

Abstract

Provided are a superhydrophobic/superoleophobic structure and a method of manufacturing the superhydrophobic/superoleophobic structure. The superhydrophobic/superoleophobic structure includes: a roughened primary structure formed on a surface of a metal base; nanopores formed in the roughened primary structure; and a hydrophobic/oleophobic layer formed on a surface of the roughened primary structure. The superhydrophobic/superoleophobic structure makes a large contact angle and a small sliding angle with both aqueous solutions and oily solutions, thereby having a high degree of superhydrophobicity/superoleophobicity. In addition, the superhydrophobic/superoleophobic structure may be formed on large or curved structural objects by the manufacturing method without using a special device.

1 . A superhydrophobic/superoleophobic structure comprising:
 a roughened primary structure formed on a surface of a metal base;   nanopores formed in the roughened primary structure; and   a hydrophobic/oleophobic layer formed on a surface of the roughened primary structure.   
     
     
         2 . The superhydrophobic/superoleophobic structure of  claim 1 , wherein the nanopores have a diameter of 1 nm to 300 nm. 
     
     
         3 . The superhydrophobic/superoleophobic structure of  claim 1 , wherein the nanopores have a diameter of 10 nm to 50 nm. 
     
     
         4 . The superhydrophobic/superoleophobic structure of  claim 1 , wherein the metal base is an aluminum (Al) base. 
     
     
         5 . The superhydrophobic/superoleophobic structure of  claim 1 , wherein the roughened primary structure comprises identical or different sidewalls and plateaus that are continuously arranged. 
     
     
         6 . The superhydrophobic/superoleophobic structure of  claim 5 , wherein each of the plateaus has a horizontal length within a range of 500 μm to 5 μm. 
     
     
         7 . The superhydrophobic/superoleophobic structure of  claim 5 , wherein the nanopores are formed in the sidewalls and the plateaus of the roughened primary structure in directions substantially perpendicular to the sidewalls and the plateaus. 
     
     
         8 . The superhydrophobic/superoleophobic structure of  claim 1 , wherein the hydrophobic/oleophobic layer comprises fluorine (F). 
     
     
         9 . The superhydrophobic/superoleophobic structure of  claim 8 , wherein the hydrophobic/oleophobic layer is a fluorine-containing silane compound layer or a fluorine-containing thiol compound layer. 
     
     
         10 . The superhydrophobic/superoleophobic structure of  claim 1 , wherein the hydrophobic/oleophobic layer is substantially not formed inside the nanopores. 
     
     
         11 . A method of manufacturing a superhydrophobic/superoleophobic structure, the method comprising:
 etching a metal base with an acid so as to form a roughened primary structure on the metal base;   anodizing the metal base on which the roughened primary structure is formed, so as to form nanopores in the roughened primary structure; and   forming a hydrophobic/oleophobic layer on a surface of the roughened primary structure.   
     
     
         12 . The method of  claim 11 , wherein the anodizing of the metal base is performed for 3 minutes to 25 minutes. 
     
     
         13 . The method of  claim 11 , wherein the etching of the metal base is performed by a wet etching method. 
     
     
         14 . The method of  claim 13 , wherein the etching of the metal base is performed using an acid solution. 
     
     
         15 . The method of  claim 11 , wherein the metal base is an aluminum (Al) base. 
     
     
         16 . The method of  claim 11 , further comprising drying the metal base at a temperature of 50° C. to 200° C. between the etching of the metal base and the anodizing of the metal base. 
     
     
         17 . (canceled) 
     
     
         18 . (canceled) 
     
     
         19 . A superhydrophilic/superoleophilic structure comprising:
 a roughened primary structure formed on a surface of a metal base; and   nanopores formed in the roughened primary structure.   
     
     
         20 . The superhydrophilic/superoleophilic structure of  claim 19 , wherein the nanopores have a diameter of 10 nm to 50 nm. 
     
     
         21 . The superhydrophilic/superoleophilic structure of  claim 19 , wherein the roughened primary structure comprises identical or different sidewalls and plateaus that are continuously arranged. 
     
     
         22 . The superhydrophilic/superoleophilic structure of  claim 21 , wherein each of the plateaus has a horizontal length within a range of 500 nm to 5 μm. 
     
     
         23 . The superhydrophilic/superoleophilic structure of  claim 19 , wherein a fluorine-containing compound is not formed on the roughened primary structure. 
     
     
         24 . A method of manufacturing a superhydrophilic/superoleophilic structure, the method comprising:
 etching a metal base with an acid so as to form a roughened primary structure on the metal base; and   anodizing the metal base on which the roughened primary structure is formed, so as to form nanopores in the roughened primary structure.   
     
     
         25 . The method of  claim 24 , wherein the anodizing of the metal base is performed for 3 minutes to 25 minutes. 
     
     
         26 . The method of  claim 24 , wherein the etching of the metal base is performed by a wet etching method. 
     
     
         27 . The method of  claim 26 , wherein the etching of the metal base is performed using an acid solution. 
     
     
         28 . The method of  claim 24 , wherein the method does not comprise forming a fluorine-containing compound layer on the roughened primary structure. 
     
     
         29 . (canceled)