Investigation of the Zeta Potential of Electrically Polarized Inrterfaces
电极化界面 Zeta 电位的研究
基本信息
- 批准号:0730391
- 负责人:
- 金额:$ 24万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2007
- 资助国家:美国
- 起止时间:2007-07-15 至 2010-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
National Science Foundation - Division of Chemical &Transport Systems Particulate & Multiphase Processes Program (1415)Proposal Number: 0730391 Principal Investigators: Sides, Paul Affiliation: Carnegie Mellon University Proposal Title: Investigation of the Zeta Potential of Electrically PolarizedInrterfaces The field of this research is electrochemically directed self-assembly of colloidal particles on electrodes. A hypothesis about the mechanism behind an experimentally observed electrolyte-dependent motion of colloidal particles near an electrode will be tested. The experimental observation is that a correlation between a phase angle and the aggregation or separation of two particles during ac polarization exists. The expected angle is 90o. The observed angles are less than 90o for KOH and greater than 90o for bicarbonate solution. The particles separate in KOH and aggregate in KOH. This correlation between the phase angle relative to 90o and whether the particles aggregate or separate has been verified for several combinations of electrolyte and electrode. The reason for this solution dependent correlation remains unknown. The hypothesis is that the required extra force arises from a flow mechanism called "faradaically coupled electroosmosis" (FCEO) driven by interaction of lateral electric field components with charge in the electrode's double layer. FCEO breaks the symmetry of the strong force arising from the "particle based electroosmosis" (PBEO) interaction between the electric field and particles' charge. FCEO modifies the particle behavior such that the particle height and electric field do not exhibit the expected _/2 phase relationship. The research will improve knowledge of forces important in the formation of ordered layers of particles on surfaces. The potential application areas are sensors and optical technology. Intellectual Merit The intellectual thrust of this proposal is the hypothesis that electroosmotic flow due to interaction between electric fields and the double layers of the particle and electrode is the key to understanding not only the behavior of a single particle near a polarized electrode but also to understanding the aggregative/separative behavior of multi-particle systems. Proving this hypothesis would complete the understanding of remote assembly of particles. The problem is rich in science and engineering; it involves the combination of colloidal, electrochemical, and hydrodynamic phenomena. The proposed investigation includes novel experimentation and multiphysical electrohydrodynamic computer simulations. The propose investigation is the capstone study necessary to complete the puzzle of this most subtle effect. Broader Impact The phenomena of this study are of fundamental interest to colloid science and technology. New display technologies employ the interaction of electric fields with particles encapsulated with liquids. Cells, given their charge, can be manipulated by electrohydrodynamic flows and even sorted. Electroosmotic flow is important in technologies beyond the details of this problem, particularly in microfluidic transport of liquids. The new perspectives gained will also support the development of laboratory experiments already inserted into the colloid science curriculum. The research will be a part of the training of a graduate student and undergraduates at Carnegie Mellon, who will become productive agents in the scientific and engineering community.
国家科学基金会-化学运输系统分部颗粒多相过程计划(1415)提案编号:0730391 主要研究者:Sides,Paul 所属单位: 卡内基梅隆大学 提案标题:电极化内表面Zeta电位的研究 本研究的领域是电极上胶体颗粒的电化学定向自组装。将测试关于实验观察到的电极附近的胶体颗粒的电解质依赖性运动背后的机制的假设。实验结果表明,在交流极化过程中,两个粒子的聚集或分离与相位角之间存在相关性。预期角度为90 °。在KOH溶液中观察到的角小于90 °,在碳酸氢盐溶液中观察到的角大于90 °。颗粒在KOH中分离并在KOH中聚集。对于电解质和电极的几种组合,已经证实了相对于90 °的相位角与颗粒是聚集还是分离之间的这种相关性。这种溶液依赖相关性的原因仍然未知。该假设是所需的额外力来自于被称为“法拉第耦合电渗”(FCEO)的流动机制,该流动机制由横向电场分量与电极双层中的电荷的相互作用驱动。FCEO打破了由电场和粒子电荷之间的“基于粒子的电渗”(PBEO)相互作用产生的强力的对称性。FCEO改变了粒子的行为,使得粒子高度和电场不表现出预期的1/2相位关系。这项研究将提高对在表面上形成有序颗粒层的重要力的认识。潜在的应用领域是传感器和光学技术。这个建议的智力推力是假设,由于电场和粒子和电极的双层之间的相互作用而产生的电渗流不仅是理解极化电极附近单个粒子行为的关键,也是理解多粒子系统聚集/分离行为的关键。证明这一假设将完成对粒子远程组装的理解。这个问题在科学和工程上都很丰富;它涉及到胶体、电化学和流体动力学现象的结合。建议的调查包括新颖的实验和多物理电流体动力学计算机模拟。所提出的调查是完成这一最微妙效应之谜所必需的顶点研究。更广泛的影响这项研究的现象是胶体科学和技术的根本利益。新的显示技术利用电场与用液体封装的粒子的相互作用。细胞,鉴于其电荷,可以通过电流体动力学流动进行操纵,甚至进行分选。电渗流是重要的技术超出了这个问题的细节,特别是在液体的微流体传输。获得的新观点也将支持已经插入胶体科学课程的实验室实验的发展。这项研究将成为卡内基梅隆大学研究生和本科生培训的一部分,他们将成为科学和工程界的生产力代理人。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Paul Sides其他文献
Paul Sides的其他文献
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{{ truncateString('Paul Sides', 18)}}的其他基金
Particulate-based Imaging Amperometry for Rapid Measurement of Current Dist ribution
基于颗粒的成像电流分析法快速测量电流分布
- 批准号:
1133082 - 财政年份:2011
- 资助金额:
$ 24万 - 项目类别:
Continuing Grant
Investigation of Enantioselective Adsorption on Chiral Mineral Surfaces
手性矿物表面对映选择性吸附的研究
- 批准号:
0521719 - 财政年份:2005
- 资助金额:
$ 24万 - 项目类别:
Standard Grant
Effect of Electro-osmotic Forces on the Behavior of a Colloidal Particle Near an Electrode During ac Excitation
交流激励期间电渗力对电极附近胶体颗粒行为的影响
- 批准号:
0338089 - 财政年份:2004
- 资助金额:
$ 24万 - 项目类别:
Standard Grant
Morphological Instability During CdTe Homoepitaxy
CdTe 同质外延过程中的形态不稳定性
- 批准号:
9813938 - 财政年份:1999
- 资助金额:
$ 24万 - 项目类别:
Standard Grant
The Influence of Substrates on the Kinetics of Cadmium Telluride Organmetallic Vapor-Phase Epitaxy
衬底对碲化镉有机金属气相外延动力学的影响
- 批准号:
9319186 - 财政年份:1994
- 资助金额:
$ 24万 - 项目类别:
Continuing Grant
OMVPE and Characterization of CdTe Epitaxial Films
CdTe 外延膜的 OMVPE 和表征
- 批准号:
8908547 - 财政年份:1989
- 资助金额:
$ 24万 - 项目类别:
Continuing Grant
Reduction of Solids Into and Onto Liquid Substrates
将固体减少到液体基质中和液体基质上
- 批准号:
8717688 - 财政年份:1987
- 资助金额:
$ 24万 - 项目类别:
Standard Grant
Research Initiation: Concentration Dependent Diffusion Coefficients of Complex Anions in the Zinc/Chlorine Battery
研究启动:锌/氯电池中复杂阴离子的浓度依赖性扩散系数
- 批准号:
8204367 - 财政年份:1982
- 资助金额:
$ 24万 - 项目类别:
Standard Grant
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