Colloidal caterpillars for cargo transportation

Sasaki, Yuji; Takikawa, Yuichi; Jampani, Venkata Subba Rao; Hoshikawa, Hikaru; Seto, Takafumi; Bahr, Christian; Herminghaus, Stephan; Hidaka, Yoshiki; Orihara, Hiroshi

doi:10.1039/c4sm01354a

Cited by 52 publications

(47 citation statements)

References 32 publications

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“…We direct the structural dipole is antiparallel to the direction of dipole, 0 v < [9]. Theoretically, the amplitude of electrophoretic velocity is predicted to be [9] ( ) [8,9,11,[13][14][15] and in the guiding effect of the director field [8,11,[16][17][18][19], there are no experimental data on how v depends on ε% and σ% , the two crucial properties of the nematic electrolyte. As predicted by Eq.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte

et al. 2017

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Liquid crystal electrolytes enable nonlinear electrophoresis of colloidal particles with velocities proportional to the square of the applied field. We demonstrate that the magnitude and even the polarity of electrophoretic mobility can be controlled by the anisotropy of electric conductivity and dielectric permittivity of the liquid crystal. In particular, reversal of electrophoretic mobility can be triggered either by temperature or composition changes that alter the signs of the conductivity and permittivity anisotropies. Controllable reversal of mobility adds to the list of advantages of anisotropic electrolytes over their isotropic counterparts. † olavrent@kent.edu

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Section: Introductionmentioning

confidence: 99%

Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte

et al. 2017

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“…The contrast of the stripe pattern is weak because of the small ∆n. The value is smaller than that of MBBA ∼ 15 µm in the earlier report [22] where the same commercial cells are used. It is also found that the temperature does not change the width so much.…”

Section: Resultsmentioning

confidence: 38%

“…The similar nature is observed for MBBA. [22] However the structure still cannot be maintained in Williams domains. On the other hand, we found that chains with moderate length consisting of ∼ 30 particles or fewer can exhibit a caterpillar-like motion in Williams domains.…”

Section: Resultsmentioning

confidence: 99%

“…Such collective dynamics is a topic of general interest from experimental and theoretical perspectives. [24,25] On the other hand, the NLC material used in earlier reports [22,23] is limited to MBBA ((4-methoxybenzylidene)-4-butylaniline). It is interesting to explore other systems to obtain further information.…”

Section: Introductionmentioning

confidence: 99%

“…Recently it is found that the chain of elastic dipoles shows a directed caterpillar-like motion in EHC. [22,23] This system provides a unique nature that enables a motion of self-assembled particles whose deformation occurs out of the focal plane of the microscope. Such collective dynamics is a topic of general interest from experimental and theoretical perspectives.…”

Section: Introductionmentioning

confidence: 99%

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Microscopic characterisation of self-assembled colloidal particles in electrohydrodynamic convection of a low-birefringence nematic liquid crystal

et al. 2015

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Electrokinetics of small particles immersed in anisotropic fluids is attracting attention in recent years. Here we focus on microscopic appearance of single as well as self-assembled particles moving in the electrohydrodynamic convection (EHC) of a nematic liquid crystal with low-birefringence. Characterization of the birefringent properties is made by polarized light microscopy under different illumination conditions. Because of the small optical anisotropy, the director distortion around the particles clearly exhibits distinctive colors on both sides depending on the height in the cell. The observation can be explained as the change in the net phase retardation of the light. It is also found that a caterpillar-like motion is possible by tuning temperature, although the horizontal size of the EHC rolls is relatively narrow.

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Active colloids in liquid crystals

Lavrentovich

2016

Current Opinion in Colloid & Interface Science

102

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Active colloids in liquid crystals (ACLCs) is an active matter with qualitatively new facets of behavior as compared to active matter that becomes isotropic when relaxed into an equilibrium state. We discuss two classes of ACLCs: (i) "externally driven ACLCs", in which the motion of colloidal particles is powered by an externally applied electric field, and (ii) "internally driven ACLCs", formed by selfpropelled particles such as bacteria. The liquid crystal (LC) medium is of a thermotropic type in the first case and lyotropic (water based) in the second case. In the absence of external fields and self-propelled particles, the ACLCs are inactive, with the equilibrium LC state exhibiting long-range orientational order.The external electric field causes ACLCs of type (i) to experience translations, rotations, and orbiting, powered by mechanisms such as LC-enabled electrokinetics, Quincke rotations and entrapment at the defects of LC order. A dense system of Quincke rotators, orbiting along circularly shaped smectic defects, undergoes a transition into a collective coherent orbiting when their activity increases. An example of internally driven ACLCs of type (ii) is living liquid crystals, representing swimming bacteria placed in an otherwise passive lyotropic chromonic LC. The LC strongly affects many aspects of bacterial behavior, most notably by shaping their trajectories. As the concentration of bacteria and their activity increase, the orientational order of living liquid crystals experiences two-stage instability: first, the uniform steady equilibrium director is replaced with a periodic bend deformation, then, at higher activity, pairs of positive and negative disclinations nucleate, separate, and annihilate in dynamic patterns of topological turbulence.The ACLCs are contrasted to their isotropic counterparts.2

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Colloidal caterpillars for cargo transportation

Cited by 52 publications

References 32 publications

Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte

Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte

Microscopic characterisation of self-assembled colloidal particles in electrohydrodynamic convection of a low-birefringence nematic liquid crystal

Active colloids in liquid crystals

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