Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

2.4K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
2.4K
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

1.0K
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
1.0K
Generalized Hooke's Law01:22

Generalized Hooke's Law

2.8K
The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
2.8K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.8K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.8K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

3.2K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
3.2K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

15.4K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
15.4K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Flowering Phenological Patterns of Entomophilous Plants in an Alpine Grassland of the Qilian Mountains.

Plants (Basel, Switzerland)·2026
Same author

Moisture sorption and hydration dynamics in intrinsically hygroscopic hydrogels.

Science advances·2026
Same author

Ten-year progression of Caroli's disease with portal hypertension despite endoscopic and pharmacological therapy: Implications for liver transplantation-A case report.

SAGE open medical case reports·2026
Same author

Interfacial Electron Engineering for Nitrate-to-Ammonia Electrocatalysis: Mechanistic Insights and Design Strategies.

Nanomaterials (Basel, Switzerland)·2026
Same author

Population-based incidence trends and surgery-associated survival among patients with synchronous lung metastases across solid tumors from 2010 to 2022.

Scientific reports·2026
Same author

Effects of Metal Ions of Metal-Organic Framework Membranes on the Transport of NaCl Solutions toward Seawater Desalination.

ACS applied materials & interfaces·2026

Related Experiment Video

Updated: Feb 25, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

16.1K

Generalized Two-Temperature Model for Coupled Phonons in Nanosized Graphene.

Meng An1,2, Qichen Song1,2, Xiaoxiang Yu1,2

  • 1State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology (HUST) , Wuhan 430074, People's Republic of China.

Nano Letters
|August 5, 2017
PubMed
Summary

Understanding phonon coupling in graphene is key for thermal conductivity. This study introduces new metrics, phonon-phonon coupling factor and length, to quantify these interactions in nanosized graphene.

Keywords:
Phononscoupling strengthmolecular dynamics simulationsnanosized graphenetwo-temperature model

More Related Videos

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

10.4K
Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

19.5K

Related Experiment Videos

Last Updated: Feb 25, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

16.1K
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

10.4K
Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

19.5K

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Designing graphene composites with high thermal conductivity necessitates understanding phonon interactions.
  • Phonon coupling is crucial for heat transport in nanoscale materials.

Purpose of the Study:

  • To quantitatively characterize phonon coupling in nanosized graphene.
  • To explain thermal resistance within graphene structures.

Main Methods:

  • Extended the two-temperature model to include coupled groups of phonons.
  • Introduced new physical quantities: phonon-phonon coupling factor and length.

Main Results:

  • Demonstrated a quantitative method to characterize phonon coupling.
  • Observed non-equilibrium between different phonon groups.
  • Showcased system-size dependence of the proposed coupling length.

Conclusions:

  • The phonon-phonon coupling factor and length provide new insights into heat transport in graphene.
  • The findings help explain thermal resistance in nanosized graphene.
  • This work advances the understanding of phonon dynamics for thermal management applications.