أرسل هذا في رسالة قصيرة: Ultrathin Two-Dimensional Membranes Assembled by Ionic Covalent Organic Nanosheets with Reduced Apertures for Gas Separation

 ______     _____    __   _      ___      _____   
|      \\  |  ___|| | || | ||   / _ \\   / ____|| 
|  --  //  | ||__   | '--' ||  / //\ \\ / //---`' 
|  --  \\  | ||__   | .--. || |  ___  ||\ \\___   
|______//  |_____|| |_|| |_|| |_||  |_|| \_____|| 
`------`   `-----`  `-`  `-`  `-`   `-`   `----`