研究目的
Investigating the spectral analysis of non-equilibrium electrokinetic vortices at a micro/nanochannel interface to understand their periodic behavior and the effects of applied voltages and solution concentrations on vortex formation frequency.
研究成果
The spectral analysis revealed the periodic nature of non-equilibrium electrokinetic vortices, with higher frequency vortices formed under stronger electric fields or lower solution concentrations. These findings are expected to contribute to the development of micromixers in the micromachine research field.
研究不足
The study is limited by the experimental setup's frame rate and the range of applied voltages and solution concentrations tested. The findings are specific to the micro/nanochannel platform used and may not be directly applicable to other systems.
1：Experimental Design and Method Selection:
The study involved spectral analysis of non-equilibrium electrokinetic vortices at a micro/nanochannel interface under various conditions of electric fields and solution concentrations.
2：Sample Selection and Data Sources:
Various concentrations of potassium chloride (KCl) solution were prepared as the electrolyte solution, with a small quantity of Rhodamine B for visualization.
3：List of Experimental Equipment and Materials:
The microfluidic device was fabricated using a standard MEMS process, and experiments were conducted using inverted epifluorescent microscopy, a CCD camera, and a commercial power supply.
4：Experimental Procedures and Operational Workflow:
The microchannels were filled with KCl solution, and DC electric potentials were applied across the microfluidic device. Vortex formation was observed and recorded.
5：Data Analysis Methods:
Spectral analysis was performed based on the time sequence of the representative fluorescent intensity value at a probing point near the micro/nanochannel interface.
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