An investigation of the aging of electro exploded platinum nanopowder
Aged wire electro-exploded, platinum nanopowder has been characterized by differential scanning calorimetry (DSC) and a comparative analysis made between virgin and aged platinum nanopowder. The platinum nanopowder had a wide distribution of particle sizes between 5 to 250 nm and a purity of 99.9%....
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2012
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| Online Access: | http://hdl.handle.net/10356/50964 |
| _version_ | 1826117020442165248 |
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| author | Chen, Wei. |
| author2 | Christopher Shearwood |
| author_facet | Christopher Shearwood Chen, Wei. |
| author_sort | Chen, Wei. |
| collection | NTU |
| description | Aged wire electro-exploded, platinum nanopowder has been characterized by differential scanning calorimetry (DSC) and a comparative analysis made between virgin and aged platinum nanopowder. The platinum nanopowder had a wide distribution of particle sizes between 5 to 250 nm and a purity of 99.9%. The powder was highly agglomerated, with a high density of defects. For virgin platinum nanopowder, the differential scanning calorimetry (DSC) results indicated that there are two endothermic reactions at about 100°C and 350°C, an exothermic reaction within the temperature range of 173.4°C to 198.57°C. The two reaction peaks are likely due to melting and crystallization. The activation energy of the virgin platinum was about 96±5% KJ/mol for exothermic peak. The DSC indicated that the peak temperature of exothermic peak for aged Platinum nanopowder appeared to be shifted up by 2% when it was pre-sintered at 100°C for up to five hours. When it was aged for eight hours, the peak temperature was increased by 4% compared to normal powder. According to the finding, the calculated activation energy for age platinum nanopowder was 97KJ/mol. It was no difference comparing with virgin platinum nanopowder. |
| first_indexed | 2024-10-01T04:20:56Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/50964 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:20:56Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/509642023-03-04T18:32:43Z An investigation of the aging of electro exploded platinum nanopowder Chen, Wei. Christopher Shearwood School of Mechanical and Aerospace Engineering DRNTU::Engineering::Materials::Nanostructured materials Aged wire electro-exploded, platinum nanopowder has been characterized by differential scanning calorimetry (DSC) and a comparative analysis made between virgin and aged platinum nanopowder. The platinum nanopowder had a wide distribution of particle sizes between 5 to 250 nm and a purity of 99.9%. The powder was highly agglomerated, with a high density of defects. For virgin platinum nanopowder, the differential scanning calorimetry (DSC) results indicated that there are two endothermic reactions at about 100°C and 350°C, an exothermic reaction within the temperature range of 173.4°C to 198.57°C. The two reaction peaks are likely due to melting and crystallization. The activation energy of the virgin platinum was about 96±5% KJ/mol for exothermic peak. The DSC indicated that the peak temperature of exothermic peak for aged Platinum nanopowder appeared to be shifted up by 2% when it was pre-sintered at 100°C for up to five hours. When it was aged for eight hours, the peak temperature was increased by 4% compared to normal powder. According to the finding, the calculated activation energy for age platinum nanopowder was 97KJ/mol. It was no difference comparing with virgin platinum nanopowder. Bachelor of Engineering (Mechanical Engineering) 2012-12-28T06:48:47Z 2012-12-28T06:48:47Z 2012 2012 Final Year Project (FYP) http://hdl.handle.net/10356/50964 en Nanyang Technological University 55 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials::Nanostructured materials Chen, Wei. An investigation of the aging of electro exploded platinum nanopowder |
| title | An investigation of the aging of electro exploded platinum nanopowder |
| title_full | An investigation of the aging of electro exploded platinum nanopowder |
| title_fullStr | An investigation of the aging of electro exploded platinum nanopowder |
| title_full_unstemmed | An investigation of the aging of electro exploded platinum nanopowder |
| title_short | An investigation of the aging of electro exploded platinum nanopowder |
| title_sort | investigation of the aging of electro exploded platinum nanopowder |
| topic | DRNTU::Engineering::Materials::Nanostructured materials |
| url | http://hdl.handle.net/10356/50964 |
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