Acoustic Radiation Force
Acoustic Radiation Force - Related Videos
12:26
Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Cited by 4 •
2013
In this video we first describe fabrication and operation procedures of a surface acoustic wave (SAW) acoustic counterflow device. We then demonstrate an experimental setup that allows for both qualitative flow visualization and quantitative analysis of complex flows within the SAW pumping device.
14:22
Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Cited by 6 •
2014
Acoustic cavitation in liquids submitted to power ultrasound creates transient extreme conditions inside the collapsing bubbles, which are the origin of unusual chemical reactivity and light emission, known as sonoluminescence. In the presence of noble gases, nonequilibrium plasma is formed. The "hot" particles and the photons generated by collapsing bubbles are able to excite species in solution.
08:17
Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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Cited by 9 •
2015
Stereotactic ablative body radiation therapy (SBRT) involves the precise delivery of high-dose radiation to cancer tumor targets. A novel SBRT platform offers a first-of-its-kind gimbaled radiation accelerator mounted within a pivoting O-ring gantry capable of dynamic image-guided tumor tracking. Here, we describe dynamic tumor tracking for lung targets.
02:59
Biological Effects of Radiation
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2020
All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
01:17
Radiation: Applications
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2023
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes. The average...
FAQs
The key mechanism is a change in wave momentum when the wave interacts with matter. Absorption removes momentum from the wave, while reflection or scattering redirects it. The resulting change appears as a time-averaged pressure imbalance. That imbalance can produce a net push, allowing the object or interface to move.
Wave intensity, frequency, object size, material properties, and the surrounding medium all influence the force. Intensity describes the wave strength, while frequency affects how the wave interacts with the object. Differences in size, materials, or the medium can change the resulting pressure distribution, thereby altering both force magnitude and motion.
These interaction pathways change the wave's momentum in different ways. Absorption transfers momentum into the object or interface, reflection reverses or redirects part of the wave momentum, and scattering distributes momentum among new directions. Their relative contributions determine the pressure differences that push, trap, or position matter.
Researchers can apply sound so that the resulting pressure differences move particles without direct mechanical contact. By considering wave intensity, frequency, particle size, material properties, and the surrounding medium, they can influence the particle response. This enables positioning or separating particles while reducing the need for physical handling.
In acoustofluidics, the force provides a way to handle particles and fluids through sound-induced pressure effects rather than direct contact. Its ability to push, trap, or position matter supports fluid handling and particle separation. These capabilities make it relevant to systems designed for controlled manipulation at small scales.
The phenomenon supports studies of wave-matter interactions, materials research, and biomedical technologies. Researchers can examine how changes in wave conditions and material properties affect motion or positioning, while applied systems use the resulting force for noncontact manipulation, particle separation, and fluid handling. These uses connect fundamental physics with practical technology development.