Related Experiment Video
Updated: Apr 19, 2026
07:20
Trapping of Micro Particles in Nanoplasmonic Optical Lattice
Published on: September 5, 2017
7.1K
Size effects on thermal rectification in mass-graded anharmonic lattices
M Romero-Bastida1, Armando González-Alarcón1
1SEPI ESIME-Culhuacán, Instituto Politécnico Nacional, Avenida Santa Ana 1000, Colonia San Francisco Culhuacán, Delegación Coyoacan, Distrito Federal 04430, Mexico.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 11, 2014
Summary
This study investigates thermal rectification in mass-graded anharmonic oscillator lattices. Increasing mass gradient with system size significantly enhances thermal rectification due to asymmetric temperature profiles.
Area of Science:
- Condensed matter physics
- Statistical mechanics
- Non-equilibrium thermodynamics
Background:
- Thermal rectification is crucial for designing heat flux control devices.
- Understanding heat transport in low-dimensional systems is essential for nanotechnology.
- Anharmonic lattices exhibit complex thermal properties.
Purpose of the Study:
- To investigate the thermal rectification efficiency in a one-dimensional mass-graded anharmonic oscillator lattice.
- To explore the effect of system size and mass gradient scaling on thermal rectification.
- To identify the underlying mechanisms responsible for observed thermal rectification effects.
Main Methods:
- Simulations of a one-dimensional mass-graded anharmonic oscillator lattice.
- Analysis of thermal rectification efficiency at large system sizes.
- Examination of local temperature profiles under varying mass gradient conditions.
Main Results:
- A modest increase in thermal rectification was observed in the mass-graded lattice.
- Substantial enhancement of thermal rectification occurred when the mass gradient scaled with system size.
- An asymmetry in the local temperature profile was identified as the cause for enhanced rectification.
Conclusions:
- Thermal rectification efficiency in these lattices is sensitive to mass grading.
- Scaling the mass gradient with system size offers a route to significantly improve thermal rectification.
- Asymmetric local temperature profiles are key to understanding and optimizing thermal rectification in such systems.
Related Concept Videos
02:54Trends in Lattice Energy: Ion Size and Charge
27.8K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
27.8K
01:19Thermal Strain
3.2K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
3.2K
01:16Thermal Sigmatropic Reactions: Overview
2.7K
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...
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...
2.7K
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
792
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
792
01:12Temperature Dependent Deformation
677
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
677
01:09Thermal Stress
3.7K
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
3.7K