2021 Fiscal Year Final Research Report
Study on the electrical insulating performance improvement of pure water by addition of nitrogen fine bubbles and polymers
| Project/Area Number |
19K14972
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 21010:Power engineering-related
|
|---|
| Research Institution | Fukuoka University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2019-04-01 – 2022-03-31
|
| Keywords | 純水 / 電気絶縁 / 抵抗率 / 窒素ファインバブル / 高分子 / 非イオン界面活性剤 / ダイヤモンド・ライク・カーボン（DLC） / グラフェン |
|---|
| Outline of Final Research Achievements |
It was found that the addition of nitrogen fine bubbles improved the resistivity and dielectric strength of pure water to approximately 1.8 times and 1.3 times, respectively. In addition, it was found that the resistivity of pure water was improved to approximately 1.5 times or could be maintained high value by individually adding non-ionic polymers having molecular weight of 3,000 to 1,000,000 and addition amount of approximately 0.0000001 to 0.001 w/v%. Furthermore, it was found that the resistivity of pure water could be maintained high value by the higher the number of nitrogen substitutions in the test container. Finally, it was also found that the resistivity could be maintained high value and the dielectric strength could be improved by using metal coated with DLC or graphene in pure water.
|
| Free Research Field |
電気電子工学（電力、電気電子材料）、ナノマイクロ科学（ナノ材料）、プラズマ学（プラズマ応用科学）
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究では、石油由来の電気絶縁油（鉱油）の代わりに、持続可能で環境に無害な純水を変圧器の絶縁冷却媒体として使用するための基礎研究として、純水の抵抗率の向上と抵抗率低下の抑制を実現することを目指した。その結果、DLCやグラフェンで被覆した金属を純水中で用い、窒素FBや高分子を純水に付加することで、純水の抵抗率と絶縁耐力が高くなる傾向を見出すことができた。このことは、電力工学（電気機器）、電気電子材料工学（誘電体、複合材料）、ナノ材料科学（ナノコンポジット）などの幅広い学術領域において、大変重要な知見であるとともに、持続可能な社会の実現に貢献できる可能性があると考えている。
|
