Virtual components for droplet control using marangoni flows: Size-selective filters, traps, channels, and pumps

Basu, Amar S.; Yee, Seow Yuen; Gianchandani, Yogesh B.

doi:10.1109/memsys.2007.4432975

Cited by 5 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using a laser as heat source makes it possible to move isotropic objects such as steel spheres, as it allows light to hit the surface at a precise point [49]. Finally, stationary heated structures on a chip suspended above the surface can generate many types of behaviours by using point, line, annular or triangular heat sources [50].…”

Section: Marangoni Effectmentioning

confidence: 99%

Surface swimmers, harnessing the interface to self-propel

et al. 2018

View full text Add to dashboard Cite

In the study of microscopic flows, self-propulsion has been particularly topical in recent years, with the rise of miniature artificial swimmers as a new tool for flow control, low Reynolds number mixing, micromanipulation or even drug delivery. It is possible to take advantage of interfacial physics to propel these micro-robots, as demonstrated by recent experiments using the proximity of an interface, or the interface itself, to generate propulsion at low Reynolds number. This paper discusses how a nearby interface can provide the symmetry breaking necessary for propulsion. An overview of recent experiments illustrates how forces at the interface can be used to generate locomotion. This paper then presents original results concerning two systems. The first is composed of floating ferromagnetic spheres that assemble through capillarity into swimming structures. The second system, also powered by a magnetic field, is a centimetersized piece that swims similarly to water striders.

show abstract

Section: Marangoni Effectmentioning

confidence: 99%

Surface swimmers, harnessing the interface to self-propel

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Researchers are now going further and further in the design of lab -on -a -chip platforms whose processing units enable combined and automatized operations on microfluidic systems such as droplet production, sizeselective sorting, pumping, division and fusion, transport along microchannels or trapping [15] - [17]. Ref.…”

Section: Introductionmentioning

confidence: 99%

Azimuthal instability of the radial thermocapillary flow around a hot bead trapped at the water-air interface

Koleski,

Vilquin,

Loudet

et al. 2020

Preprint

View full text Add to dashboard Cite

We investigate the radial thermocapillary flow driven by a laser-heated microbead in partial wetting at the water-air interface. Particular attention is paid to the evolution of the convective flow patterns surrounding the hot sphere as the latter is increasingly heated. The flow morphology is nearly axisymmetric at low laser power (P). Increasing P leads to symmetry breaking with the onset of counter-rotating vortex pairs. The boundary condition at the interface, close to no-slip in the low-P regime, turns about stress-free between the vortex pairs in the high-P regime. These observations strongly support the view that surface-active impurities are inevitably adsorbed on the water surface where they form an elastic layer. The onset of vortex pairs is the signature of a hydrodynamic instability in the layer response to the centrifugal forced flow. Interestingly, our study paves the way for the design of active colloids able to achieve high-speed self-propulsion via vortex pair generation at a liquid interface.

show abstract

“…Where liquid is moved and patterned to drag objects without taking into account the object physical properties. For instance, a large type of objects such as glass and metallic beads, micro-components [10], drops [11] and air bubbles [12] can be manipulated. The principle used is based on the shear stress variation on a fluid-fluid/gas interface.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale-object handling by temperature modulation of surface stresses

Vela

Hafez

Régnier

et al. 2009

2009 International Symposium on Micro-NanoMechatronics and Human Science

View full text Add to dashboard Cite

In this work, we present the non-contact manipulation of mesoscale random-shaped, large and heavy objects immersed in thin liquid water (< 0.8mm). The manipulation principle used is the modulation of surface tension by infra red (IR) laser (1480nm) absorption. Laser absorption generates surface-tension-driven flows. At the water-air interface, the flows go away from the laser beam (colder region), and at the bottom they go toward the laser (recirculation cell). We use these flows to drag immersed objects toward the laser focus. With laser scanning, several kinds of fluidic patterns can be obtained for specific handlings such as trapping, mixing and sorting of microcomponents. High speed flows can be reached; therefore high velocity particle manipulation can be achieved (several mm/s). Experimental measurements reported a velocity of about 5mm/s for a spherical glass bead of 90μm in diameter. With these flows, nN range forces are obtained. These forces are about 1000 times larger than forces generated with optical tweezers.

show abstract

Virtual components for droplet control using marangoni flows: Size-selective filters, traps, channels, and pumps

Cited by 5 publications

References 7 publications

Surface swimmers, harnessing the interface to self-propel

Surface swimmers, harnessing the interface to self-propel

Azimuthal instability of the radial thermocapillary flow around a hot bead trapped at the water-air interface

Mesoscale-object handling by temperature modulation of surface stresses

Contact Info

Product

Resources

About