Controlled Optofluidic Crystallization of Colloids Tethered at Interfaces

Caciagli, Alessio; Singh, Rajesh; Joshi, Darshana; Adhikari, R.; Eiser, Erika

doi:10.1103/physrevlett.125.068001

Cited by 16 publications

(13 citation statements)

References 54 publications

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“…[ 50 ] In addition, the temperature gradient can generate a convection flow at and nearby the focus. This additional thermophoretic‐induced flow [ 51 ] will also be responsible of the tetragonal core fluctuation motion to some extent as well as it will increase the mobility of the external swarming NPs in order to release the excess of heat.…”

Section: Discussionmentioning

confidence: 99%

Unraveling the three‐dimensional morphology and dynamics of the optically evolving polystyrene nanoparticle assembly using dual‐objective lens microscopy

Kamit

Tseng

Kudo

et al. 2021

J Chinese Chemical Soc

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Dynamically fluctuating assembly is prepared by trapping microparticles or nanoparticles at an interface. This phenomenon was previously described for 500 nm polystyrene nanoparticles optically trapped at water/glass interface, yielding a single disk‐like assembly, which size is much larger than the focal volume. In this work, we use a dual‐objective lens microscope to study the three‐dimensional shape and dynamics of such disk‐like assembly. The higher resolution of this system together with fast image acquisition (80 fps) rendered novel insights (e.g., particle fluctuation, assembly shape, interparticle distance, and so on), which could not be resolved using a conventional inverted microscope. These new insights will help to unravel the basis of this not yet fully understood “optically evolved phenomena,” which has a large potential in different research fields such as optical trapping, soft matter, and colloidal chemistry.

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Section: Discussionmentioning

confidence: 99%

Unraveling the three‐dimensional morphology and dynamics of the optically evolving polystyrene nanoparticle assembly using dual‐objective lens microscopy

Kamit

Tseng

Kudo

et al. 2021

J Chinese Chemical Soc

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“…To generate colloidal ensemble in temporary steady states rather than creating static architectures, different strategies have been developed [7]. For instance employing external electric or magnetic fields [8][9][10], electrostatic [11,12], optothermal [13], optofluidic [14], and hydrodynamic [15] interactions it is possible to trigger the assembly of colloids into adjustable functional pattern [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Extensive efforts have gone into investigating particles at the gas-liquid and liquid-liquid interface [14,[22][23][24]. The body of theoretical and experimental work studying particles at the solid surface is much less than that for gas-liquid interface, although there is a growing literature in this area.…”

Section: Introductionmentioning

confidence: 99%

Light-induced manipulation of passive and active microparticles

et al. 2021

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We consider sedimented at a solid wall particles that are immersed in water containing small additives of photosensitive ionic surfactants. It is shown that illumination with an appropriate wavelength, a beam intensity profile, shape and size could lead to a variety of dynamic, both unsteady and steady state, configurations of particles. These dynamic, well-controlled and switchable particle patterns at the wall are due to an emerging diffusio-osmotic flow that takes its origin in the adjacent to the wall electrostatic diffuse layer, where the concentration gradients of surfactant are induced by light. The conventional nonporous particles are passive and can move only with already generated flow. However, porous colloids actively participate themselves in the flow generation mechanism at the wall, which also sets their interactions that can be very long ranged. This light-induced diffusio-osmosis opens novel avenues to manipulate colloidal particles and assemble them to various patterns. We show in particular how to create and split optically the confined regions of particles of tunable size and shape, where well-controlled flow-induced forces on the colloids could result in their crystalline packing, formation of dilute lattices of well-separated particles, and other states. Graphic Abstract

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“…20 21 22 23 The colloids have the advantage of easy manipulation under external fields. 24 25 26 27 28 29 30 Conventionally, colloids are trapped using a focused laser beam 31 . 32 Although powerful, the conventional optical schemes are constrained by the diffraction limit of light.…”

Section: Introductionmentioning

confidence: 99%

Optothermal pulling, trapping, and assembly of colloids using nanowire plasmons

Sharma,

Tiwari,

Paul

et al. 2021

Preprint

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Optical excitation of colloids can be harnessed to realize soft matter systems that are out of equilibrium. In this paper, we present our experimental studies on the dynamics of silica colloids in the vicinity of a silver nanowire propagating surface plasmon polaritons (SPPs). Due to the optothermal interaction, the colloids make a transition from a diffusive to superdiffusive behaviour, and are directionally pulled towards the excitation point of the nanowire. Having reached this point, they are spatio-temporally trapped around the excitation location. By increasing the concentration of colloids in the system, we observe multi-particle assembly around the nanowire. This process is thermophoretically driven and assisted by SPPs. Furthermore, we find such an assembly to be sensitive to the excitation polarization at input of the nanowire.Numerically-simulated temperature distribution around an illuminated nanowire corroborates sensitivity to the excitation polarization. Our study will find relevance in exploration of SPPs-assisted optothermal pulling, trapping and assembly of colloids, and can serve as test-beds of plasmon-driven active matter.

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Controlled Optofluidic Crystallization of Colloids Tethered at Interfaces

Cited by 16 publications

References 54 publications

Unraveling the three‐dimensional morphology and dynamics of the optically evolving polystyrene nanoparticle assembly using dual‐objective lens microscopy

Unraveling the three‐dimensional morphology and dynamics of the optically evolving polystyrene nanoparticle assembly using dual‐objective lens microscopy

Light-induced manipulation of passive and active microparticles

Optothermal pulling, trapping, and assembly of colloids using nanowire plasmons

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