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Related Concept Videos

Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Electrodes: Overview01:17

Electrodes: Overview

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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
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ATP Driven Pumps I: An Overview01:27

ATP Driven Pumps I: An Overview

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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Finding Electric Potential From Electric Field01:13

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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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Determining Electric Field From Electric Potential01:12

Determining Electric Field From Electric Potential

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The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
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Electric Potential Energy in a Uniform Electric Field01:09

Electric Potential Energy in a Uniform Electric Field

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When an electric field accelerates a free positive charge, it acquires kinetic energy. This process is analogous to an object being accelerated by a gravitational field as if the charge were going down an electrical hill where its electric potential energy is converted into kinetic energy, although, of course, the sources of the forces are very different. The electrostatic or Coulomb force acting on the positive test charge is conservative, which means that the work done on a test charge is...
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Exterior-electrode electrically driven microconcentrator.

Chia-Chun Hsu1, Yan-Chang Lee1, Wen-Hsin Hsieh1

  • 1Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-tech Innovations, National Chung Cheng University, Chia-Yi, Taiwan, Republic of China.

Electrophoresis
|July 14, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces an exterior-electrode microconcentrator using negative dielectrophoresis and AC electroosmosis. It efficiently concentrates samples like E. coli and latex particles externally for improved detection.

Keywords:
3-D face-to-faceAC ElectroosmosisDielectrophoresisExterior to the electrodeMicroconcentrator

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Analytical Chemistry

Background:

  • Microfluidic devices are crucial for sample manipulation.
  • Efficient pre-concentration of analytes is vital for sensitive detection.
  • Existing methods face challenges in integration and efficiency.

Purpose of the Study:

  • To develop and characterize an electrically driven microconcentrator.
  • To utilize negative dielectrophoresis and AC electroosmosis for sample concentration.
  • To investigate concentration performance using an exterior-electrode design.

Main Methods:

  • Employing a 3-D face-to-face electrode configuration.
  • Utilizing electroosmotic flow to position samples near electrodes.
  • Applying negative dielectrophoresis to concentrate samples exterior to electrodes.
  • Optimizing frequency and voltage for concentration.

Main Results:

  • Optimal concentration achieved at 100 kHz and 13 Vp-p.
  • Five-vertex electrode shape yielded highest concentration factors.
  • Concentration enhancement factors of 55x for latex particles and 11x for E. coli were observed.
  • Demonstrated repeatable concentration without non-specific adsorption.

Conclusions:

  • The exterior-electrode microconcentrator is effective for sample pre-concentration.
  • The device shows promise for integration with detection systems.
  • Optimized electrode geometry and electrical parameters enhance performance.