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AC Electrokinetic Phenomena Generated by Microelectrode Structures
Published on: July 29, 2008
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由于水吸附而导致水友颗粒的静电充电
Rubia F Gouveia1, Fernando Galembeck
1Institute of Chemistry, University of Campinas-UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil.
Journal of the American Chemical Society
|July 30, 2009
概括
大气中的水吸附改变了二氧化和酸薄膜的表面电荷. 这一过程涉及氧和离子的分离,在没有外部电荷注入的情况下改变静电电位.
科学领域:
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
- 静电学 静电学 静电学
背景情况:
- 非晶体二氧化和酸薄膜表现出复杂的表面性能.
- 了解介电材料中的电荷动态对于各种应用至关重要.
- 大气因素在修改表面电荷方面的作用尚未完全阐明.
研究的目的:
- 研究相对湿度对非晶体二氧化和酸薄膜的静电潜力的影响.
- 确定负责表面电荷变化的机制.
- 为了验证大气水吸附驱动电荷分离的假设.
主要方法:
- 凯尔文力显微镜被用来测量静电电位图案.
- 对非晶体二氧化和酸颗粒的薄膜进行了测量.
- 实验是在受控制的相对湿度下在电屏蔽和接地环境中进行的.
主要成果:
- 观察到复杂且不可逆转的静电电位模式.
- 与粒子表面相邻的潜力始终是负的.
- 与薄膜表面平行检测到超过+/-10 MV/m的显著潜在梯度.
- 有证据表明,水吸附导致OH (−) 和H (−) 离子分离.
结论:
- 大气表现为这些介电材料中的静电电荷的来源和沉积点.
- 水吸附和随后的离子分离是表面电荷修饰的主要驱动因素.
- 对于这些水友固体的电荷状态变化,不需要外部电荷注入机制 (接触, tribochemical,电化学).
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