การสังเคราะห์เส้นใยของเงินในระดับไมโครเมตรด้วยปฏิกิริยาแทนที่แกลแวนิก
The fabrication of silver microstructure via galvanic replacement between aluminum foil sheet and silver ions from silver nitrate solution was studied. Effects of the concentration of silver nitrate solution and mole ratio between Ag+ : NO₃ - on the morphological structures were investigated in orde...
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| Format: | Senior Project |
| Language: | Thai |
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จุฬาลงกรณ์มหาวิทยาลัย
2014
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| Online Access: | https://digiverse.chula.ac.th/Info/item/dc:9859 |
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| Summary: | The fabrication of silver microstructure via galvanic replacement between aluminum foil sheet and silver ions from silver nitrate solution was studied. Effects of the concentration of silver nitrate solution and mole ratio between Ag+ : NO₃ - on the morphological structures were investigated in order to propose the growth formation. Morphology including size and shape of the galvanized silver microstructures were characterized by scanning electron microscope (SEM). From galvanic reaction, several structures of silver microstructure such as dendrite, crystal, prism, and fiber were observed. Moreover, catalytic activities of the silver microstructures were evaluated using the reduction reaction of 4-nitrophenol. The reduction of 4- nitrophenol was monitored by UV-visible spectroscopy. Rate constant of the reaction was determined though pseudo-1st-order kinetic model. It was found that silver microfiber give the highest rate constant (0.0065 (microfiber) > 0.0030 (dendrite) >>> 2 x 10⁻⁵(crystal)) compared to the other structures. This suggests that silver microfiber has a good potential to be used as a catalyst for the reduction reaction. |
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