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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Thermosensation01:43

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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IR Spectrum01:19

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Thermochromic Infrared Metamaterials.

Xinyu Liu1, Willie J Padilla1

  • 1Department of Electrical and Computer Engineering, Duke University, Durham, NC, 27708, USA.

Advanced Materials (Deerfield Beach, Fla.)
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PubMed
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Researchers developed an infrared artificial thermochromic material using metamaterials. This passive device achieves a 30% emissivity change with independent control over wavelength and temperature dependence.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Infrared Technology

Background:

  • Thermochromic materials change color with temperature, crucial for thermal management.
  • Metamaterials offer unique electromagnetic properties not found in nature.
  • Micro-electro-mechanical systems (MEMS) enable miniaturized, precise control.

Purpose of the Study:

  • To investigate an infrared artificial thermochromic material.
  • To achieve significant emissivity changes for thermal applications.
  • To independently control emissivity's peak wavelength and temperature dependence.

Main Methods:

  • Fabrication of a metamaterial emitter integrated with a bimaterial MEMS.
  • Measurement of emissivity across a temperature range (room temperature to 623 K).
  • Analysis of the material's thermal emission characteristics.

Main Results:

  • Achieved a differential emissivity exceeding 30% between 623 K and room temperature.
  • Demonstrated independent control over the peak emission wavelength.
  • Showcased independent control over the temperature dependence of emissivity.
  • Observed thermal emission following a super Stefan-Boltzmann power curve.

Conclusions:

  • The developed metamaterial-based device functions as an effective artificial thermochromic material.
  • The passive device offers precise, independent control over infrared emissivity properties.
  • This technology holds potential for advanced thermal management and infrared signature control.