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接触電化による複数の相互作用する粒子の充電
Siowling Soh1, Helena Liu, Rebecca Cademartiri
1Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States.
Journal of the American Chemical Society
|August 30, 2014
まとめ
粒状材料におけるコンタクト電気化は複雑である. この研究では,3つの主要なメカニズムが特定されました:物質の接触チャージ,同じ極性の大気への放電,そして非接触粒子間の長距離電荷の影響.
科学分野:
- 物理 物理学 物理学とは
- マテリアルサイエンス 材料科学
- トリボロジ トリボロジ トリボロジ トリボロジ
背景:
- 乱れた粒子のシステムは,工業的および自然的なプロセスにおいて一般的です.
- 粒子の間の接触電化は重要な現象であるが,十分に理解されていない.
- 複雑な粒子の移動と相互作用は,充電機構の研究を妨げています.
研究 の 目的:
- 動乱粒子のシステムにおけるコンタクト電気化の基本的メカニズムを調査する.
- 個々の粒子の安定状態の電荷に影響を与える要因を解明する.
- 様々な充電・放電プロセスを区別する.
主な方法:
- 異なる素材のミリメートルサイズのポリマービーズを使用してカスタムシステムが設計されました.
- 数珠は,衝突を許すのに位置交換を制限するために,ほぼ満杯の皿に振られました.
- 個々のビーズの電荷は,ビーズの組成と配置の系統的な変動の後,振動後に測定されました.
主要な成果:
- 安定状態のビーズ電荷を制御する3つの主要なメカニズムが特定されました.
- コンタクト電化: 充電は,異なる材料のビーズ間で発生します.
- コンタクト脱電:大気への放電は,同じ極性を持つビーズの電荷を減少させます.
- 遠距離影響:同じ極性を持つ非接触ビーズ間で観測された電荷伝送.
結論:
- 動揺した粒状物質の静止状態の電荷は,要因の組み合わせによって決定されます.
- これらのメカニズムを理解することは,粉末や粒状の流れにおける静電現象を制御するために極めて重要です.
- 非接触粒子間の電荷拡散に関するさらなる研究が必要である.
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