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The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
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Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
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Electric charge is the most fundamental quantity in an electric circuit. The effects of electric charge are encountered daily, such as when a wool sweater sticks to the human body or when a person receives a shock while walking on a carpet.
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An interesting property of a conductor in static equilibrium is that extra charges on the conductor end up on its outer surface, regardless of where they originate. Consider a hollow metallic conductor with a uniform surface charge density. Since the conductor itself is in electrostatic equilibrium, there should not be any electric field inside the conductor. Now, assume a Gaussian surface enclosing the hollow portion. Applying Gauss's law, the inner surface of the hollow conductor will not...
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RC Circuits: Discharging A Capacitor01:27

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One of the applications of an RC circuit is the relaxation oscillator. The relaxation oscillator comprises a voltage source, a capacitor, a resistor, and a neon lamp. The lamp acts like an open circuit (infinite resistance) until the potential difference across the neon lamp reaches a specific voltage. At that voltage, the lamp acts like a short circuit (zero resistance), and the capacitor discharges through the neon lamp and produces light. Once the capacitor is fully discharged through the...
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Overcharging and charge inversion: Finding the correct explanation(s).

Wiebe M de Vos1, Saskia Lindhoud2

  • 1Membrane Surface Science, University of Twente, MESA+ Institute for Nanotechnology, P.O. Box 217, 7500 AE Enschede, the Netherlands.

Advances in Colloid and Interface Science
|November 8, 2019
PubMed
Summary
This summary is machine-generated.

Surface charge can reverse sign due to interacting species, a phenomenon called charge inversion. Explanations often debate between chemical and physical interactions, with few systems having a single cause.

Keywords:
Charge inversionCharge regulationCharge reversalOvercharging

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Biophysical Chemistry

Background:

  • Overcharging and charge inversion describe surface charge sign reversal with interacting species.
  • Charge inversion explains protein adsorption onto similarly charged surfaces.
  • Explanations for these phenomena are debated, categorized as chemical or physical.

Purpose of the Study:

  • To review charge inversion broadly across different systems.
  • To connect various proposed explanations for charge inversion.
  • To highlight the balance between chemical and physical explanations, referencing Johannes Lyklema's work.

Main Methods:

  • Literature review of charge inversion phenomena.
  • Analysis of competing chemical and physical explanations.
  • Synthesis of findings across diverse experimental systems.

Main Results:

  • Charge inversion is observed with surfactants, polyelectrolytes, proteins, and ions.
  • Explanations often involve specific attractive (chemical) or electrostatic (physical) interactions.
  • Few experimental systems allow for a single, definitive explanation.

Conclusions:

  • Charge inversion is a complex phenomenon with multifaceted explanations.
  • A balanced perspective considering both chemical and physical factors is often necessary.
  • Understanding charge inversion is crucial for various applications, including protein adsorption.