Related Experiment Video
Updated: Jul 23, 2025
09:43
Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
Published on: August 13, 2019
9.5K
Acoustic transparency of the chain-chain interface
1Institute for Problems in Mechanical Engineering RAS, Saint Petersburg, Russia and Peter the Great Saint Petersburg Polytechnical University, Saint Petersburg, Russia.
Physical Review. E
|July 19, 2023
Summary
Adding elastic foundations to harmonic chains alters wave packet transmission. This allows for control over the transmission coefficient and interfacial thermal resistance in nanosystems.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Wave packet propagation across interfaces is crucial for thermal transport.
- Harmonic chains with on-site potentials model simplified lattice vibrations.
- Interfacial properties significantly influence thermal resistance in nanostructures.
Purpose of the Study:
- To investigate wave packet propagation through interfaces of dissimilar harmonic chains.
- To analyze the effect of on-site potentials (elastic foundations) on transmission coefficients.
- To explore methods for manipulating interfacial thermal resistance.
Main Methods:
- Derivation of the transmission coefficient using two distinct theoretical approaches.
- Analysis of wave packet energy transfer across the interface.
- Modeling harmonic chains with and without elastic foundations.
Main Results:
- The transmission coefficient typically decreases with increasing frequency without elastic foundations.
- Elastic foundations can lead to nonmonotonic or increasing transmission coefficients.
- Total interface transparency (transmission coefficient = 1) is achievable with elastic foundations.
Conclusions:
- Elastic foundations offer a mechanism to control wave packet transmission at interfaces.
- This control can be leveraged to tune interfacial thermal resistance in low-dimensional systems.
- The findings have implications for designing nanodevices with tailored thermal properties.
Related Concept Videos
01:07Propagation of Waves
2.4K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.4K
02:04Protein-Protein Interfaces
3.8K
3.8K
01:06Echo
536
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
536
01:04Anionic Chain-Growth Polymerization: Mechanism
2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K
01:04¹³C NMR: ¹H–¹³C Decoupling
1.1K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.1K
01:23Impedances and Admittance
730
In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
730