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Related Concept Videos

Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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 1,5-hexadiene, referred to as...

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Updated: May 19, 2026

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Published on: August 30, 2024

A Generalized Automated Framework for Thermal Characterization: From Bulk Materials to Complex Heterostructures.

Miguel Ángel Tenaguillo1, Elena Pérez-Picazo1, Olga Caballero-Calero1

  • 1Instituto de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM+CSIC), c/ Isaac Newton, 8, Tres Cantos, Madrid, Spain.

Small (Weinheim an Der Bergstrasse, Germany)
|May 17, 2026
PubMed
Summary
This summary is machine-generated.

A new automated photoacoustic method accurately measures thermal conductivity in challenging multilayer films. This tool aids in developing advanced thermoelectric materials by analyzing copper selenide films and their properties.

Keywords:
copper selenideselectrodepositioninverse analysisphotoacoustic methodthermal conductivitythermoelectric materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermoelectrics

Background:

  • Accurate thermal conductivity measurement is crucial for thermoelectric materials.
  • Existing methods face challenges with multilayer structures and electrodeposited materials due to surface roughness and complex preparation.

Purpose of the Study:

  • To develop a fully automated, MATLAB-based computational framework for determining thermal conductivity in multilayer structures using generalized photoacoustic theory.
  • To provide a robust inverse analysis tool for characterizing electrodeposited materials with non-ideal surfaces.

Main Methods:

  • Implementation of a generalized photoacoustic theory within a MATLAB framework for inverse analysis.
  • Benchmarking the methodology against Bi2Te3/3D anodic aluminum oxide (3D-AAO) nanocomposites.
  • Characterization of electrodeposited copper selenide (CuxSe) films.

Main Results:

  • The framework accurately reproduced literature values for reference nanocomposites.
  • Thermal conductivity of electrodeposited CuxSe films showed a clear dependence on copper stoichiometry.
  • Sensitivity analyses confirmed photoacoustic signal dominance by film thermal conductivity.

Conclusions:

  • The developed photoacoustic framework offers an accessible and validated tool for in situ characterization of structurally non-ideal films.
  • This advancement accelerates the development of next-generation energy materials, particularly thermoelectrics.
  • Insights into phonon scattering mechanisms were gained through the analysis of CuxSe stoichiometry.