Colloidal Crystals from Microfluidics

Bian, Feika; Sun, Lingyu; Cai, Lijun; Wang, Yu; Wang, Yuetong; Zhao, Yuanjin

doi:10.1002/smll.201903931

Cited by 45 publications

(23 citation statements)

References 183 publications

(283 reference statements)

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“…[423][424][425][426] Microfluidic devices have also been used to screen for optimal evaporation-driven or destabilization-driven (addition of a suitable precipitant) conditions for the assembly of nanoparticles. [427,428] The behavior of colloidal particles in solution attracts considerable attention, as these provide a model of many complex fluids of great practical importance. These systems have been extensively treated by both theory and experiment, where individual micrometer-scale particles can be readily imaged using optical microscopy techniques, and their motion followed in real-time.…”

Section: Crystallization Of Colloidal Particles In Confinementmentioning

confidence: 99%

Crystallization in Confinement

2020

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Many crystallization processes of great importance, including frost heave, biomineralization, the synthesis of nanomaterials, and scale formation, occur in small volumes rather than bulk solution. Here, the influence of confinement on crystallization processes is described, drawing together information from fields as diverse as bioinspired mineralization, templating, pharmaceuticals, colloidal crystallization, and geochemistry. Experiments are principally conducted within confining systems that offer well‐defined environments, varying from droplets in microfluidic devices, to cylindrical pores in filtration membranes, to nanoporous glasses and carbon nanotubes. Dramatic effects are observed, including a stabilization of metastable polymorphs, a depression of freezing points, and the formation of crystals with preferred orientations, modified morphologies, and even structures not seen in bulk. Confinement is also shown to influence crystallization processes over length scales ranging from the atomic to hundreds of micrometers, and to originate from a wide range of mechanisms. The development of an enhanced understanding of the influence of confinement on crystal nucleation and growth will not only provide superior insight into crystallization processes in many real‐world environments, but will also enable this phenomenon to be used to control crystallization in applications including nanomaterial synthesis, heavy metal remediation, and the prevention of weathering.

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Section: Crystallization Of Colloidal Particles In Confinementmentioning

confidence: 99%

Crystallization in Confinement

2020

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“…The fabrication of colloidal structures using microfluidic devices has attracted an enormous interest. 16,68,69 As for the biochemical applications previously described, the fabrication of colloids currently falls in the field of droplet microfluidics. It is our intention here to highlight a more recent research direction that is currently gaining momentum based on the fabrication of colloidal crystal-like structures by taking advantage of the hydrodynamic interactions among droplets discussed before.…”

Section: With Permission Frommentioning

confidence: 99%

Microfluidic formation of crystal-like structures

2021

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“…The ability to dynamically manipulate colloidal particles at interfaces is essential prerequisites for offering new and revolutionary solutions for developing strategies of self-repairing complexes and integrated structures, the creation of new materials such as hybrid bioelectro-mechanical systems, building adaptive sensors, optoelectronic, optical devices, and active structural colour materials [1][2][3][4][5][6]. To generate colloidal ensemble in temporary steady states rather than creating static architectures, different strategies have been developed [7].…”

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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Colloidal Crystals from Microfluidics

Cited by 45 publications

References 183 publications

Crystallization in Confinement

Crystallization in Confinement

Microfluidic formation of crystal-like structures

Light-induced manipulation of passive and active microparticles

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