Surface Acoustic Wave Microfluidics

Yeo, Leslie; Friend, James

doi:10.1146/annurev-fluid-010313-141418

Cited by 478 publications

(343 citation statements)

References 143 publications

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“…Recently, there has been increased interest in surface acoustic wave (SAW) based microfluidics (often called acoustofluidics) and biosensors due to their promising applications in the fields of lab-on-a-chip and point of care diagnosis [13][14][15][16][17][18]. For these applications, it is essential to develop strategies for reliable and efficient microfluidic functions and manipulation of particles and bio-molecules in the liquid, such as in a droplet-digital microfluidics [19][20][21].…”

Section: Acoustofluidicsmentioning

confidence: 99%

Slippery Liquid-Infused Porous Surfaces and Droplet Transportation by Surface Acoustic Waves

et al. 2017

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Section: Acoustofluidicsmentioning

confidence: 99%

Slippery Liquid-Infused Porous Surfaces and Droplet Transportation by Surface Acoustic Waves

et al. 2017

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“…9 Most acoustofluidic particle manipulation devices utilise standing wave fields, and the acoustic streaming field is generally dominated by boundary-driven streaming which arises from the acoustic attenuation within the acoustic boundary layer due to the non-slip condition on the walls of the fluid channel. Another significant streaming pattern, Eckart streaming, 10 requires acoustic absorption over longer distances (as is the case in surface acoustic wave devices 11,12 ) than those found in these bulk acoustic wave resonators. Experimental observation and modelling of surface acoustic wave devices by Tan et al 13 reveal a rich pattern of streaming vortices in such devices.…”

Section: Introductionmentioning

confidence: 97%

Modal Rayleigh-like streaming in layered acoustofluidic devices

2016

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Classical Rayleigh streaming is well known and can be modelled using Nyborg’s limiting velocity method as driven by fluid velocities adjacent to the walls parallel to the axis of the main acoustic resonance. We have demonstrated previously the existence and the mechanism of four-quadrant transducer plane streaming patterns in thin-layered acoustofluidic devices which are driven by the limiting velocities on the walls perpendicular to the axis of the main acoustic propagation. We have recently found experimentally that there is a third case which resembles Rayleigh streaming but is a more complex pattern related to three-dimensional cavity modes of an enclosure. This streaming has vortex sizes related to the effective wavelength in each cavity axis of the modes which can be much larger than those found in the one-dimensional case with Rayleigh streaming. We will call this here modal Rayleigh-like streaming and show that it can be important in layered acoustofluidic manipulation devices. This paper seeks to establish the conditions under which each of these is dominant and shows how the limiting velocity field for each relates to different parts of the complex acoustic intensity patterns at the driving boundaries.

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“…Centrifugal-based microfluidics 5 can drive fluidic routing, mixing, and metering on rotating substrates with on-chip valves and channels, but the motor required for actuation is expensive, and this platform lacks flexibility; the spinning chip cannot be interfaced with external electrical readouts or sensors. Platforms based on SAW 12 and electrical forces 13 offer an effective means to transport liquid on-chip, but require expensive and often large electrical equipment. In terms of developing microfluidic systems for point-of-care diagnostics, personalized medicine, and environmental monitoring, developing more portable fluidic manipulation technology is an important step for reaching this goal.…”

Section: Introductionmentioning

confidence: 99%

Contactless microfluidic pumping using microchannel-integrated carbon black composite membranes

Gagnon

2015

Biomicrofluidics

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The ability to pump and manipulate fluid at the micron-scale is a basic requirement for microfluidic platforms. Many current manipulation methods, however, require expensive and bulky external supporting equipment, which are not typically compatible for portable applications. We have developed a contactless metal electroosmotic micropump capable of pumping conductive buffers. The pump operates using two pairs of gallium metal electrodes, which are activated using an external voltage source and separated from a main flow channel by a thin micron-scale polydimethylsiloxane (PDMS) membrane. The thin contactless membrane allows for field penetration and electro-osmotic flow within the microchannel, but eliminates electrode damage and sample contamination commonly associated with traditional DC electro-osmotic pumps that utilize electrodes in direct contact with the working fluid. Our previous work has demonstrated the effectiveness of this method in pumping deionized water. However, due to the high resistivity of PDMS, this method proved difficult to apply towards manipulating conductive buffers. To overcome this limitation, we fabricated conductive carbon black (CB) powder directly into the contactless PDMS membranes. The increased electrical conductivity of the contactless PDMS membrane significantly increased micropump performance. Using a microfluidic T-channel device and an electro-osmotic flow model, we determined the influence that CB has on pump pressure for CB weight percents varying between 0 and 20. The results demonstrate that the CB increases pump pressure by two orders of magnitude and enables effective operations with conductive buffers. V C 2015 AIP Publishing LLC. [http://dx

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Surface Acoustic Wave Microfluidics

Cited by 478 publications

References 143 publications

Slippery Liquid-Infused Porous Surfaces and Droplet Transportation by Surface Acoustic Waves

Slippery Liquid-Infused Porous Surfaces and Droplet Transportation by Surface Acoustic Waves

Modal Rayleigh-like streaming in layered acoustofluidic devices

Contactless microfluidic pumping using microchannel-integrated carbon black composite membranes

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