A novel passive micromixer designed by applying an optimization algorithm to the zigzag microchannel

Lateral optical forces induced by linearly polarized laser beams have been predicted to deflect dipolar particles with opposite chiralities toward opposite transversal directions. These "chirality-dependent" forces can offer new possibilities for passive all-optical enantioselective sorting of chiral particles, which is essential to the nanoscience and drug industries. However, previous chiral sorting experiments focused on large particles with diameters in the geometrical-optics regime. Here, we demonstrate, for the first time, the robust sorting of Mie (size~wavelength) chiral particles with different handedness at an air-water interface using optical lateral forces induced by a single linearly polarized laser beam. The nontrivial physical interactions underlying these chirality-dependent forces distinctly differ from those predicted for dipolar or geometrical-optics particles. The lateral forces emerge from a complex interplay between the light polarization, lateral momentum enhancement, and out-of-plane light refraction at the particle-water interface. The sign of the lateral force could be reversed by changing the particle size, incident angle, and polarization of the obliquely incident light.

show abstract

“…The optofluidic chip was made from polydimethylsiloxane (PDMS) 55 . A PDMS slice was first cut into a block (2 × 2 cm 2 ).…”

Section: Chip Fabrication and Experimental Setupmentioning

confidence: 99%

Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In eqn (10), MI is the mixing index, n is the total numbers of sample points, k i is the mole fraction over the outlet crosssection, and k is the average mole fraction. The value of MI varies between 0 and 1 where MI ¼ 0 (0% mixing) indicates no mixing, while MI ¼ 1 represents complete mixing (100% mixing).…”

Section: Modeling Assumptions and Fabrication Processmentioning

confidence: 99%

A hybrid micromixer with planar mixing units

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Generally, these methods can be divided into two categories: active methods and passive methods [4]. Passive methods usually utilize various geometries [5–17] of microchannels and different shapes of obstacles [18–23] or grooves [24–27] placed in microchannels to disturb the laminar flow for vortex formation. Passive methods do not need external energy sources, but the channels of such methods usually need to be designed with complex structures, thereby increasing the fabrication difficulty.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic‐vortex formation near a two‐part cylinder with same‐sign zeta potentials in a straight microchannel

2020

View full text Add to dashboard Cite

Vortex formation near a two-part cylinder with zeta potentials of different values but the same sign under an external DC electric field is numerically investigated in this paper. The cylinder, inserted in a straight microchannel filled with an aqueous solution, is composed of an upstream part and a downstream part. When a DC electric field is applied in the channel, under certain conditions, the vortex will form near the cylinder due to the different velocities of electroosmotic flow generated on the cylinder surface. The numerical results reveal that the larger the velocity difference of electroosmotic flow generated on the two-part cylinder and the smaller the channel width, the more conducive to vortex formation in the channel. In addition, if the zeta potential ratios of cylinder downstream part to upstream part and channel wall to cylinder upstream part are unchanged, the DC electric field strength and the zeta potential value do not affect the pattern of vortices formed in the channel. This study provides a way for vortex formation in microchannels and has the potential application in microfluidic devices.

show abstract

A novel passive micromixer designed by applying an optimization algorithm to the zigzag microchannel

Cited by 191 publications

References 20 publications

Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation

Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation

A hybrid micromixer with planar mixing units

Electrokinetic‐vortex formation near a two‐part cylinder with same‐sign zeta potentials in a straight microchannel

Contact Info

Product

Resources

About