Acoustofluidics 24: theory and experimental measurements of acoustic interaction force

Sepehrirahnama, Shahrokh; Mohapatra, Abhishek Ray; Oberst, Sebastian; Chiang, Yan Kei; Powell, David A.; Lim, Kok Hwa

doi:10.1039/d2lc00447j

Cited by 7 publications

(4 citation statements)

References 81 publications

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“…For this regime mean-field theories, such as the one developed by Silva and Bruus [17] or Sepehrirahnama and coworkers [35,36], provide accurate predictions. Other regimes, however, are highly relevant and in need of exploration for cases where objects can no longer be treated as a point particle.…”

Section: Scattering Forces On Objects Without Sound-induced Deformationsmentioning

confidence: 98%

“…Adding another rigid particle as a boundary condition, computing the pressure and velocity fields due to the presence of that source particle, and then substituting into equation (6), produces the secondary acoustic force: the force on one particle due to the presence of another. This secondary acoustic force, which arises from rescattering events between particles in an acoustic field, can be computed analytically using perturbation expansions of p and v [17,35,36].…”

Section: Scattering Forces On Objects Without Sound-induced Deformationsmentioning

confidence: 99%

“…To zeroth order, the viscosity-induced effects on interactions among objects within the levitation plane can be accounted for by an effective size that simply adds an additional layer of thickness δ to the radius a. This is a useful approximation in the far-field limit r ≫ a, r > λ [35]. At close approach the situation becomes more interesting.…”

Section: Micro-streamingmentioning

confidence: 99%

“…Extension to the two or n-body scattering problem presents substantial theoretical challenges, and so progress has mostly been demonstrated either numerically or experimentally. Theoretical results, mainly concerning pairs of particles with differences in their material composition or geometry, have established that broken symmetry of this kind can produce unbalanced forces [35,240]. Air bubbles in particular can be used to create propulsion this way, for example by breaking their symmetry by encapsulating most of their surface [241,242].…”

Section: Nonconservative and Nonpairwise Forcesmentioning

confidence: 99%

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Acoustic manipulation of multi-body structures and dynamics

Lim,

VanSaders,

Jaeger

2024

Rep. Prog. Phys.

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Sound can exert forces on objects of any material and shape. This has made the contactless manipulation of objects by intense ultrasound a fascinating area of research with wide-ranging applications. While much is understood for acoustic forcing of individual objects, sound-mediated interactions among multiple objects at close range gives rise to a rich set of structures and dynamics that are less explored and have been emerging as a frontier for research. We introduce the basic mechanisms giving rise to sound-mediated interactions among rigid as well as deformable particles, focusing on the regime where the particles’ size and spacing are much smaller than the sound wavelength. The interplay of secondary acoustic scattering, Bjerknes forces, and micro-streaming is discussed and the role of particle shape is highlighted. Furthermore, we present recent advances in characterizing non-conservative and non-pairwise additive contributions to the particle interactions, along with instabilities and active fluctuations. These excitations emerge at sufficiently strong sound energy density and can act as an effective temperature in otherwise athermal systems.

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Section: Scattering Forces On Objects Without Sound-induced Deformationsmentioning

confidence: 98%

Section: Scattering Forces On Objects Without Sound-induced Deformationsmentioning

confidence: 99%

Section: Micro-streamingmentioning

confidence: 99%

Section: Nonconservative and Nonpairwise Forcesmentioning

confidence: 99%

See 2 more Smart Citations

Acoustic manipulation of multi-body structures and dynamics

Lim,

VanSaders,

Jaeger

2024

Rep. Prog. Phys.

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Acoustofluidic manipulation for submicron to nanoparticles

Wei,

Wang,

Wang

et al. 2024

Electrophoresis

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Particles, ranging from submicron to nanometer scale, can be broadly categorized into biological and non‐biological types. Submicron‐to‐nanoscale bioparticles include various bacteria, viruses, liposomes, and exosomes. Non‐biological particles cover various inorganic, metallic, and carbon‐based particles. The effective manipulation of these submicron to nanoparticles, including their separation, sorting, enrichment, assembly, trapping, and transport, is a fundamental requirement for different applications. Acoustofluidics, owing to their distinct advantages, have emerged as a potent tool for nanoparticle manipulation over the past decade. Although recent literature reviews have encapsulated the evolution of acoustofluidic technology, there is a paucity of reports specifically addressing the acoustical manipulation of submicron to nanoparticles. This article endeavors to provide a comprehensive study of this topic, delving into the principles, apparatus, and merits of acoustofluidic manipulation of submicron to nanoparticles, and discussing the state‐of‐the‐art developments in this technology. The discourse commences with an introduction to the fundamental theory of acoustofluidic control and the forces involved in nanoparticle manipulation. Subsequently, the working mechanism of acoustofluidic manipulation of submicron to nanoparticles is dissected into two parts, dominated by the acoustic wave field and the acoustic streaming field. A critical analysis of the advantages and limitations of different acoustofluidic platforms in nanoparticles control is presented. The article concludes with a summary of the challenges acoustofluidics face in the realm of nanoparticle manipulation and analysis, and a forecast of future development prospects.

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