Assembly and transport of nematic colloidal swarms above photo-patterned defects and surfaces

Straube, Arthur V.; Pagès, Josep M.; Ortiz-Ambriz, Antonio; Tierno, Pietro; Ignés‐Mullol, Jordi; Sagués, Francesc

doi:10.1088/1367-2630/aac3c6

Cited by 17 publications

(14 citation statements)

References 47 publications

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“…In particular, Sasaki et al [38] demonstrated that single particles and multi-particle self-assembled chains, including chains with an embedded micro-cargo, can be transported through the LC medium by combining LCEP and electrohydrodynamic convection. Another remarkable collective effect of “swarming” was demonstrated by Sagués’ group [39,40,41]. The particles in the experiments were of a pear-like shape.…”

Section: Lc-enabled Electrophoresismentioning

confidence: 83%

“…The particles driven by LCEP to the center region assemble into a rotating vortex (Figure 5e,f). Even more intriguing, the aster and spiral clusters of colloids can be moved anywhere in the plane of the LC cell, by changing the location of the UV spot (Figure 5g [39,41]). All these properties allow one to design and address dynamically reconfigurable 2D lattices of clusters [39].…”

Section: Lc-enabled Electrophoresismentioning

confidence: 99%

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Liquid Crystals-Enabled AC Electrokinetics

Peng

Lavrentovich

2019

Micromachines

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Phenomena of electrically driven fluid flows, known as electro-osmosis, and particle transport in a liquid electrolyte, known as electrophoresis, collectively form a subject of electrokinetics. Electrokinetics shows a great potential in microscopic manipulation of matter for various scientific and technological applications. Electrokinetics is usually studied for isotropic electrolytes. Recently it has been demonstrated that replacement of an isotropic electrolyte with an anisotropic, or liquid crystal (LC), electrolyte, brings about entirely new mechanisms of spatial charge formation and electrokinetic effects. This review presents the main features of liquid crystal-enabled electrokinetics (LCEK) rooted in the field-assisted separation of electric charges at deformations of the director that describes local molecular orientation of the LC. Since the electric field separates the charges and then drives the charges, the resulting electro-osmotic and electrophoretic velocities grow as the square of the applied electric field. We describe a number of related phenomena, such as alternating current (AC) LC-enabled electrophoresis of colloidal solid particles and fluid droplets in uniform and spatially-patterned LCs, swarming of colloids guided by photoactivated surface patterns, control of LCEK polarity through the material properties of the LC electrolyte, LCEK-assisted mixing at microscale, separation and sorting of small particles. LC-enabled electrokinetics brings a new dimension to our ability to manipulate dynamics of matter at small scales and holds a major promise for future technologies of microfluidics, pumping, mixing, sensing, and diagnostics.

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Section: Lc-enabled Electrophoresismentioning

confidence: 83%

Section: Lc-enabled Electrophoresismentioning

confidence: 99%

Liquid Crystals-Enabled AC Electrokinetics

Peng

Lavrentovich

2019

Micromachines

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“…Surface interactions on colloidal particles’ surface allow for the activation of their translational or rotational motion due to facile response to light − or other external stimuli. , Among the key features allowing the transformation of passive colloidal inclusions into micromotors and micromachines are functionalization of azobenzene dye molecules on the surface of colloidal particles ,− or using azobenzene dyes in the anisotropic nematic fluid host. ,− ,− …”

Section: Liquid Crystal Colloids Fabrication Methodsmentioning

confidence: 99%

Design and Preparation of Nematic Colloidal Particles

2022

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Colloidal systems are abundant in technology, in biomedical settings, and in our daily life. The so-called “colloidal atoms” paradigm exploits interparticle interactions to self-assemble colloidal analogs of atomic and molecular crystals, liquid crystal glasses, and other types of condensed matter from nanometer- or micrometer-sized colloidal building blocks. Nematic colloids, which comprise colloidal particles dispersed within an anisotropic nematic fluid host medium, provide a particularly rich variety of physical behaviors at the mesoscale, not only matching but even exceeding the diversity of structural and phase behavior in conventional atomic and molecular systems. This feature article, using primarily examples of works from our own group, highlights recent developments in the design, fabrication, and self-assembly of nematic colloidal particles, including the capabilities of preprogramming their behavior by controlling the particle’s surface boundary conditions for liquid crystal molecules at the colloidal surfaces as well as by defining the shape and topology of the colloidal particles. Recent progress in defining particle-induced defects, elastic multipoles, self-assembly, and dynamics is discussed along with open issues and challenges within this research field.

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“…It will also be interesting to quantify the effect of fluid visco-elasticity [174], composition (e.g. liquid crystals [175,176]), and wall elasticity [177,178,179,180,181,182,183,184,185,186] on the collective motion of driven colloidal suspensions.…”

Section: Perspectivesmentioning

confidence: 99%

Leveraging collective effects in externally driven colloidal suspensions: experiments and simulations

Driscoll

Delmotte

2019

Current Opinion in Colloid & Interface Science

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In this review article, we focus on collective motion in externally driven colloidal suspensions, as well as how these collective effects can be harnessed for use in microfluidic applications. We highlight the leading role of hydrodynamic interactions in the self-assembly, emergent behavior, transport, and mixing properties of colloidal suspensions. A special emphasis is given to recent numerical methods to simulate driven colloidal suspensions at large scales. In combination with experiments, they help us to understand emergent dynamics and to identify control parameters for both individual and collective motion in colloidal suspensions.

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Assembly and transport of nematic colloidal swarms above photo-patterned defects and surfaces

Cited by 17 publications

References 47 publications

Liquid Crystals-Enabled AC Electrokinetics

Liquid Crystals-Enabled AC Electrokinetics

Design and Preparation of Nematic Colloidal Particles

Leveraging collective effects in externally driven colloidal suspensions: experiments and simulations

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