أرسل هذا في رسالة قصيرة: Flexible morphology-controlled synthesis of monodisperse α-Fe2O3 hierarchical hollow microspheres and their gas-sensing properties

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