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Related Concept Videos

Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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MOSFET: Enhancement Mode01:22

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
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MOSFET01:16

MOSFET

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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
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MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
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Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Electrically gated molecular thermal switch.

Man Li1, Huan Wu1, Erin M Avery2,3

  • 1Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095, USA.

Science (New York, N.Y.)
|November 2, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel solid-state thermal switch using molecular junctions. This electronically controlled device offers rapid, tunable heat flow control for advanced thermal management systems.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Controlling heat flow is crucial for electronics, energy systems, and thermal therapy.
  • Existing thermal management solutions face limitations in response time and tunability.

Purpose of the Study:

  • To demonstrate an electronically gated solid-state thermal switch with high performance at room temperature.
  • To utilize self-assembled molecular junctions for precise thermal conductance modulation.

Main Methods:

  • Fabrication of a three-terminal solid-state device using self-assembled molecular junctions.
  • Modulation of heat flow via an electric field applied across the molecular interface.
  • Characterization of switching speeds, on/off ratios, and device endurance.

Main Results:

  • Achieved continuous and reversible modulation of heat flow.
  • Demonstrated ultrahigh switching speeds exceeding 1 megahertz.
  • Obtained on/off ratios in thermal conductance greater than 1300% with over 1 million switching cycles.

Conclusions:

  • The developed molecular thermal switch offers excellent performance for thermal management.
  • Advances in molecular engineering can lead to novel thermal circuit designs.
  • Potential applications in advanced thermal management systems and electronics.