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Related Concept Videos

Sound as Pressure Waves01:17

Sound as Pressure Waves

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
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Sound Waves: Resonance01:14

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Perception of Sound Waves01:01

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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Sound Intensity00:58

Sound Intensity

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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Sound Intensity Level00:53

Sound Intensity Level

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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
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Sound Waves01:01

Sound Waves

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
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Toward Environmentally Responsive Hypersound Materials.

Edson R Cardozo de Oliveira1, Gastón Grosman2, Chushuang Xiang1

  • 1Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS), Centre de Nanosciences et de Nanotechnologies (C2N), 10 Boulevard Thomas Gobert, 91120 Palaiseau, France.

Nano Letters
|January 13, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel nanoacoustic resonator using mesoporous silica films. This device is sensitive to humidity, enabling tunable hypersound confinement for adaptive nanophononics and sensing applications.

Keywords:
coherent acoustic phononsmesoporous materialsnanophononics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Acoustics

Background:

  • Gigahertz (GHz) acoustic phonons are crucial for advanced technologies like data processing and quantum computing.
  • Conventional nanophononic resonators struggle with environmental adaptability.

Purpose of the Study:

  • To introduce a novel open-cavity nanoacoustic resonator.
  • To demonstrate environmental sensitivity, specifically to humidity, for tunable hypersound confinement.

Main Methods:

  • Fabrication of mesoporous SiO2 thin films (MTFs) for the resonator.
  • Utilizing transient reflectivity measurements to analyze resonance frequency shifts.
  • Systematic comparison of devices with varying pore sizes and film thicknesses.

Main Results:

  • The nanoacoustic resonator exhibits significant resonance frequency shifts in response to relative humidity changes.
  • Resonances are primarily dictated by film thickness and material properties, not pore geometry.
  • Pore size influences tunability dynamics via capillary action.

Conclusions:

  • The developed mesoporous resonator offers a versatile platform for integrating nanoscale mechanics with environmental factors.
  • This design provides a simple pathway for creating environmentally responsive hypersound devices.
  • Potential applications include advanced sensing and adaptive nanophononic systems.