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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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Equivalent Capacitance01:19

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Capacitors and Capacitance01:18

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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Capacitors01:15

Capacitors

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Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
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Energy Stored in Capacitors01:10

Energy Stored in Capacitors

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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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Scanning-probe Single-electron Capacitance Spectroscopy
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Optocapacitance: physical basis and its application.

Bernardo I Pinto1, Carlos A Z Bassetto1, Francisco Bezanilla1,2

  • 1Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL 60637 USA.

Biophysical Reviews
|May 9, 2022
PubMed
Summary
This summary is machine-generated.

Light-induced heating of cell membranes causes an optocapacitive effect, generating a current that can stimulate neurons. This method offers a novel approach for neuronal stimulation, though in vivo applications face challenges.

Keywords:
Membrane capacitanceNanoparticlesOptocapacitanceRemote neuronal stimulationTemperature

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Area of Science:

  • Biophysics
  • Neuroscience
  • Optogenetics

Background:

  • Membrane capacitance naturally increases with temperature.
  • This property has inspired novel light-based neuronal stimulation techniques.
  • The photothermal effect underlies light-induced membrane property changes.

Purpose of the Study:

  • To explain the optocapacitive effect and optocapacitive current.
  • To explore the use of optocapacitance for neuronal stimulation.
  • To identify challenges for in vivo application of this technique.

Main Methods:

  • Discussing fundamental membrane properties.
  • Characterizing the optocapacitive current.
  • Reviewing applications in neuronal stimulation.

Main Results:

  • Optocapacitance arises from basic membrane properties.
  • Optocapacitive current depolarizes cells, enabling stimulation.
  • The effect is driven by photothermal membrane heating.

Conclusions:

  • Optocapacitance is a light-induced phenomenon with potential for neuronal stimulation.
  • The optocapacitive current offers a method to excite excitable tissues.
  • Further research is needed to overcome in vivo application challenges.