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Related Concept Videos

Joule-Thomson Effect01:21

Joule-Thomson Effect

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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Phase Diagram01:19

Phase Diagram

6.0K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

17.3K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Related Experiment Video

Updated: Aug 3, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

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Photothermal Effect and Phase Transition in VO2 Enhanced by Plasmonic Particles.

Vladimir Kaydashev1, Boris Khlebtsov2, Maxim Kutepov1

  • 1Laboratory of Nanomaterials, Southern Federal University, 200/1 Stachki Ave., 344090 Rostov-on-Don, Russia.

Materials (Basel, Switzerland)
|April 13, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a new surface acoustic wave (SAW) method to precisely measure temperature and conductivity changes in hybrid gold nanoparticle-vanadium dioxide (VO2) films. This technique enhances the development of advanced optical devices like metasurfaces.

Keywords:
SAWVO2coupled plasmonic nanoparticlesnanostarsphotthermal effectsurface acoustic wavesvanadium dioxide

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Multifunctional Hybrid Fe2O3-Au Nanoparticles for Efficient Plasmonic Heating
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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

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Last Updated: Aug 3, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

Published on: May 13, 2020

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Phase change metasurfaces utilizing vanadium dioxide (VO2) are crucial for programmed Terahertz (THz)/middle Infrared (IR) flat optics.
  • Gold nanoparticles (Au NPs) exhibit significant near-IR absorption and photothermal effects, enhancing VO2 switching.

Purpose of the Study:

  • To introduce a novel method for simultaneously probing temperature and electrical conductivity in hybrid Au-VO2 composites.
  • To characterize laser-induced photothermal effects in Au nanostar/VO2/TiO2/LiNbO3 composites.

Main Methods:

  • Utilizing surface acoustic waves (SAW) on a YX128° cut LiNbO3 substrate to monitor phase shifts and attenuation.
  • Employing laser-induced photothermal effects to trigger insulator-metal transitions in the composite material.
  • Characterizing Au nanostars (AuNSts) with varying surface coverage and a monolayer of 10 nm Au nanoparticles.

Main Results:

  • Achieved a temperature resolution of 0.1 °C, comparable to state-of-the-art techniques.
  • Demonstrated an optically triggered insulator-metal transition in AuNSts/VO2/TiO2/LiNbO3 composites.
  • Investigated photothermal effects at varied light power levels.

Conclusions:

  • The proposed SAW-based method is vital for characterizing and optimizing metasurface elements.
  • This technique supports the advancement of devices for lab-on-chip and optical communication/processor technologies.