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Van de Graaff Generator01:15

Van de Graaff Generator

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Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
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Related Experiment Video

Updated: Sep 10, 2025

Double-barreled and Concentric Microelectrodes for Measurement of Extracellular Ion Signals in Brain Tissue
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A Dual-Barrel Carbon Fiber Microelectrode for Generator-Collector Experiments.

Paula C Falcoswki1, Douglas P M Saraiva1, Nicolas A Ishiki2

  • 1Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo 05508-900, Brazil.

ACS Omega
|August 25, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new dual carbon fiber microelectrode for electrochemical studies. This inexpensive device, fabricated using a dual-barrel capillary, shows promise for quantitative analysis in generator-collector systems.

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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Generator-collector systems are crucial for electrochemical studies, including kinetics and quantification.
  • Microelectrodes offer advantages like well-defined diffusion profiles for precise measurements.

Purpose of the Study:

  • To describe a novel protocol for fabricating a dual carbon fiber microelectrode.
  • To evaluate the microelectrode's performance in generator-collector and scanning electrochemical microscopy (SECM) configurations.
  • To demonstrate the microelectrode's utility for analytical quantification.

Main Methods:

  • Fabrication of a dual carbon fiber microelectrode using a dual-barrel capillary and inexpensive carbon fiber.
  • Electrochemical characterization and scanning electron microscopy (SEM) imaging of the microelectrode.
  • Application in generator-collector mode with a redox probe ([Ru(NH3)6]3+) and in SECM for analyzing the iodide/iodine system.

Main Results:

  • The fabricated microelectrodes possess a microdisc geometry with well-defined diffusion.
  • An increase in collection efficiency was observed during approach to an insulating substrate in SECM.
  • Analytical information was obtained by correlating collection efficiency with thiosulfate concentration in the iodide/iodine system.

Conclusions:

  • A cost-effective and straightforward method for fabricating dual carbon fiber microelectrodes was established.
  • The microelectrode is suitable for generator-collector and SECM applications, demonstrating effective redox probe collection.
  • The device shows potential for quantitative analytical measurements in electrochemical systems.