Hydrodynamic Voltammetry
Hydrodynamic Voltammetry - Related Videos
08:37
Cyclic Voltammetry (CV)
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2023
Source: Laboratory of Dr. Kayla Green — Texas Christian University A Cyclic Voltammetry (CV) experiment involves the scan of a range of potential voltages while measuring current. In the CV experiment, the potential of an immersed, stationary electrode is scanned from a predetermined starting potential to a final value (called the switching potential) and then the reverse scan is obtained. This gives a 'cyclic' sweep of potentials and the current vs. potential curve derived from the data is...
10:13
A Microfluidic-based Hydrodynamic Trap for Single Particles
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Cited by 14 •
2011
In this article, we present a microfluidic-based method for particle confinement based on hydrodynamic flow. We demonstrate stable particle trapping at a fluid stagnation point using a feedback control mechanism, thereby enabling confinement and micromanipulation of arbitrary particles in an integrated microdevice.
12:54
Transient Expression of Proteins by Hydrodynamic Gene Delivery in Mice
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Cited by 26 •
2014
In vivo transfection of naked DNA by hydrodynamic gene delivery introduces genes into the tissue of an animal with minimal inflammatory response. Sufficient amounts of gene product are generated such that gene function and regulation as well as protein structure and function can be analyzed.
11:12
Protocol for Relative Hydrodynamic Assessment of Tri-leaflet Polymer Valves
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Cited by 5 •
2013
There has been renewed interest in developing polymer valves. Here, the objectives are to demonstrate the feasibility of modifying a commercial pulse duplicator to accommodate tri-leaflet geometries and to define a protocol to present polymer valve hydrodynamic data in comparison to native and prosthetic valve data collected under near-identical conditions.
01:20
Voltammetry: Overview
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2024
Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram. A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
FAQs
Solution motion continuously transports reactant toward the electrode and carries products away, creating a diffusion layer near the surface. Its thickness determines how readily reactant reaches the electrode, so it directly influences the limiting current. Measuring how that current changes with controlled convection helps separate effects caused by mass transport from those caused by electron-transfer kinetics.
Rotation rate or flow conditions regulate the strength of convection and therefore alter the diffusion layer at the electrode. Comparing current measurements under different transport conditions shows whether the observed response is mainly transport-limited or influenced by reaction kinetics. These controlled changes also provide a basis for estimating reaction rates from current behavior.
Removing electrochemical products from the electrode environment helps maintain controlled transport conditions and can clarify how the reaction proceeds. This feature is especially useful when a redox step is followed by another chemical or electrochemical process. The resulting current response can reveal coupled reaction behavior that may be difficult to distinguish without deliberate solution movement.
The method varies convection independently through electrode rotation or solution flow while monitoring the resulting current. Transport changes modify reactant delivery and diffusion-layer thickness, whereas electron-transfer kinetics reflect the reaction at the electrode surface. Relating current to the imposed transport condition allows researchers to identify the contribution of each effect and estimate reaction rates.
A typical workflow establishes an electrode and a controlled moving-solution condition, such as electrode rotation or solution flow. The current is then measured while the transport condition is controlled or varied. Researchers relate the measured current to rotation rate or flow conditions, using the resulting pattern to evaluate mass transport, reaction kinetics, or the behavior of a redox-active species.
Current responses obtained under controlled transport can help characterize redox-active species and estimate reaction rates. The measurements also indicate how strongly an electrode supports the relevant electron-transfer process. In analytical work, the current provides a basis for quantitative detection, while comparisons across transport conditions help interpret whether the signal reflects reaction chemistry or delivery of reactant to the surface.
The technique supports analytical measurements, evaluation of electrode performance, and studies of catalytic or coupled electrochemical reactions. It is useful when researchers need controlled mass transport rather than an uncontrolled solution environment. By connecting current with rotation or flow conditions, experiments can examine redox-active species quantitatively and investigate how transport influences reaction outcomes.