Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session D14: Acoustic Probes of Soft Condensed Matter SystemsInvited Live Streamed Undergrad Friendly
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Sponsoring Units: DSOFT Chair: Aman Agrawal, University of Houston Room: McCormick Place W-183B |
Monday, March 14, 2022 3:00PM - 3:36PM |
D14.00001: Manipulation of matter with acoustic radiation force devices Invited Speaker: Bruce Drinkwater test |
Monday, March 14, 2022 3:36PM - 4:12PM |
D14.00002: Optical and acoustic forces for biomedical applications Invited Speaker: Monika Ritsch-Marte
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Monday, March 14, 2022 4:12PM - 4:48PM |
D14.00003: Remote acoustic manipulation of objects in vivo Invited Speaker: Mohamed Ghanem Acoustic radiation forces can be converged onto an object to trap and manipulate it in three dimensions (3D). Recent advances in acoustic trapping have shown the capability to remotely manipulate small, lightweight objects in a benchtop experiment using a single or multiple transducers. Acoustic manipulation can also be used as a noninvasive medical tool to control foreign objects in the body, such as kidney stones. However, such technology requires the controlled manipulation of large solid objects, and the ability to transmit stable and robust beams through the skin; all while using a single acoustic source due to limited acoustic window in the body. A theoretical model using the Fourier spectrum was validated and used to quantify the radiation forces applied by arbitrary acoustic wavefields on heavy objects larger than the acoustic wavelength. A 1.5 MHz, focused, multi-element array was used to synthesize various acoustic beam traps to levitate and steer spheres in 3D. A characterization of the array was performed to equalize the complex vibrational output of each element to produce acoustic beams with uniform spatial pressure distribution. Beams generated for trapping had toroidal pressure fields such as vortex beams and other traps that were synthesized using an iterative angular spectrum method. The robustness of the trapping stability and steering range of the beams was achieved by controlling the pulsing directionality to eliminate spinning of the spheres, the relative size of the sphere to beam diameter, and the delivered acoustic power. We successfully demonstrated the remote acoustic levitation and manipulation of glass spheres along preprogrammed paths in the urinary bladders of live pigs placed under anesthesia at safe acoustic exposure levels. Other potential applications include controlling an ingestible camera, or cellular patterning for tissue generation in vivo using a simple source having a tailored phase mask. |
Monday, March 14, 2022 4:48PM - 5:24PM |
D14.00004: Optimizing acoustophoresis through particle asymmetry Invited Speaker: Henrik Bruus
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Monday, March 14, 2022 5:24PM - 6:00PM |
D14.00005: Acoustic Probes of Soft Condensed Matter Systems Invited Speaker: Bryan VanSaders Soft matter systems display many of the phenomena also known in conventional condensed phase physics, while offering entirely new insights due to the accessibility and tunability of the effective material properties and system dynamics. The ‘soft’ of soft matter typically refers to the relative strength of material cohesion and fluctuating thermal forces – here we present soft matter where the cohesion and fluctuating forces are both derived from high-order scattering of sound by submillimeter objects. When subjected to intense sound fields, granular objects can be supported against gravity and interact strongly to form liquid-like and solid-like condensed materials with surprising effective material properties. Furthermore, coupling between particle configurations and the encompassing acoustic cavity drives instabilities which subject such materials to noisy fluctuations that may or may not resemble a thermal bath. When levitated in air, particles experience underdamped dynamics and so linear and angular momentum play important roles in configurational transitions, while size and shape provide additional axes along which interparticle forces can be tuned. By using a combination of high-speed videography, particle tracking, and fluid simulation, we explore acoustic levitation as a tool for preparing and probing exotic soft matter systems with strong classical wave-particle coupling. |
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