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Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Thermal Sigmatropic Reactions: Overview01:16

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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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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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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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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Thermal Relaxation in Janus Transition Metal Dichalcogenide Bilayers.

Aristotelis P Sgouros1,2, Fotios I Michos3, Michail M Sigalas3

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Janus transition metal dichalcogenides (JTMDs) show varied heat dissipation. SWSe JTMDs and heterostructures significantly slow heat attenuation, offering potential for thermal management applications.

Keywords:
heterostructuresout-of-equilibrium dynamicsphononsthermal conductivitythermal transporttwo-dimensional materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Understanding heat dissipation in nanomaterials is crucial for thermal management.
  • Janus transition metal dichalcogenides (JTMDs) offer unique structural and electronic properties.
  • Exploring thermal properties of JTMDs with varying compositions and structures is essential.

Purpose of the Study:

  • To investigate heat dissipation mechanisms in Janus transition metal dichalcogenides (JTMDs).
  • To explore the effect of composition (Mo vs. W, S vs. Se) on thermal attenuation.
  • To analyze the impact of triangular lateral heterostructures on heat dissipation in JTMDs.

Main Methods:

  • Molecular dynamics (MD) simulations were employed.
  • Semi-empirical interatomic potentials were utilized to model JTMDs.
  • Temperature gradients were imposed to study heat flux and relaxation times.

Main Results:

  • SMoSe JTMDs demonstrated thermal attenuation comparable to conventional TMDs (τ_av ~10-15 ps).
  • SWSe JTMDs exhibited significantly slower heat attenuation (τ_av ~14-28 ps).
  • Triangular lateral heterostructures in JTMDs drastically reduced heat attenuation (τ_av ~100 ps).

Conclusions:

  • JTMDs present tunable thermal properties based on their constituent elements.
  • The incorporation of lateral heterostructures offers a promising route to control heat flow in 2D materials.
  • These findings have implications for designing advanced thermal management solutions in nanoelectronic devices.