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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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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.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
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Related Experiment Video

Updated: Jun 27, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

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Enhanced Elastocaloric Effects in γ-Graphyne.

Guilherme B Kanegae1, Marcelo L Pereira Junior2, Douglas S Galvão1

  • 1Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Departamento de Física Aplicada, Campinas, São Paulo 13083-859, Brazil.

ACS Applied Materials & Interfaces
|May 6, 2024
PubMed
Summary

Sustainable cooling is advanced by studying the elastocaloric (eC) effect in γ-graphyne nanoribbons. Prestraining significantly boosts the eC effect, showing potential for efficient, eco-friendly heating and cooling technologies.

Keywords:
Elastocaloric effectGraphyneMolecular DynamicsNanoribbonsPrestraining

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Technologies

Background:

  • Growing global demand for sustainable cooling and heating solutions.
  • Exploration of alternative methods to traditional vapor-compression technologies.
  • The elastocaloric (eC) effect shows promise for efficient, eco-friendly thermal management.

Purpose of the Study:

  • Investigate the elastocaloric effect in γ-graphyne nanoribbons.
  • Analyze the impact of prestrain and substrate deposition on eC properties.
  • Determine changes in eC temperature and coefficient of performance (COP).

Main Methods:

  • Classical molecular dynamics simulations.
  • Utilized two types of γ-graphyne nanoribbons: armchair and zigzag.
  • Examined variations based on substrate presence and prestrain conditions.

Main Results:

  • Substantial enhancement (over 1 order of magnitude) of the elastocaloric effect in prestrained γ-graphyne nanoribbons.
  • Achieved significant eC temperature changes (up to 224 K) and COP values (up to 14).
  • Observed distinct behaviors in carbon-carbon bond lengths correlating with eC performance.

Conclusions:

  • γ-graphyne nanoribbons exhibit significant potential for advanced elastocaloric cooling applications.
  • Prestrain is a critical factor in amplifying the eC effect in these nanostructures.
  • The findings support the development of novel, sustainable thermal management systems.