Spatially and temporally reconfigurable assembly of colloidal crystals

Kim, Youngri; Shah, Anuj; Solomon, Michael J.

doi:10.1038/ncomms4676

Cited by 62 publications

(68 citation statements)

References 36 publications

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“…On the other hand, there are recent reports on photoelectric effect toward colloidal assemblies. 35 Our work reported here is different, mainly due to the lack of ionic species inside the system, required thin liquid film for a rupture, as well as a much faster response. This theoretical derivation further confirms that our colloidal assembly is related to light absorption from the mid layer.…”

Section: Resultsmentioning

confidence: 97%

Color and Texture Morphing with Colloids on Multilayered Surfaces

Chen

Arkebauer³

et al. 2015

ACS Appl. Mater. Interfaces

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Dynamic morphing of marine species to match with environment changes in color and texture is an advanced means for surviving, self-defense, and reproduction. Here we use colloids that are placed inside a multilayered structure to demonstrate color and texture morphing. The multilayer is composed of a thermal insulating base layer, a light absorbing mid layer, and a liquid top layer. When external light of moderate intensity (∼0.2 W cm(-2)) strikes the structure, colloids inside the liquid layer will be assembled to locations with an optimal absorption. When this system is exposed to continuous laser pulses, more than 18,000 times of reversible responses are recorded, where the system requests 20 ms to start the response and another 160 ms to complete. The flexibility of our concept further allows the system to be built on a variety of light-absorbing substrates, including dyed paper, gold thin film, and amorphous silicon, with the top layer even a solid.

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Section: Resultsmentioning

confidence: 97%

Color and Texture Morphing with Colloids on Multilayered Surfaces

Chen

Arkebauer³

et al. 2015

ACS Appl. Mater. Interfaces

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“…For instance, aggregation was triggered both with photoresponsive and non‐photoresponsive particles . Light was also shown to control the crystallization of colloids, either with active particles, photoresponsive particles, light‐sensitive substrates, or non‐responsive colloids . To our knowledge, the only demonstration of photocontrol of colloidal crystallization at a fluid interface was achieved using optical trapping at the interface of an oil‐in‐water drop and led to ordered, yet very small, assemblies .…”

Section: Figurementioning

confidence: 99%

Photoswitchable Dissipative Two‐Dimensional Colloidal Crystals

et al. 2019

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Control over particle interactions and organization at fluid interfaces is of great importance both for fundamental studies and practical applications. Rendering these systems stimulus‐responsive is thus a desired challenge both for investigating dynamic phenomena and realizing reconfigurable materials. Here, we describe the first reversible photocontrol of two‐dimensional colloidal crystallization at the air/water interface, where millimeter‐sized assemblies of microparticles can be actuated through the dynamic adsorption/desorption behavior of a photosensitive surfactant added to the suspension. This allows us to dynamically switch the particle organization between a highly crystalline (under light) and a disordered (in the dark) phase with a fast response time (crystallization in ≈10 s, disassembly in ≈1 min). These results evidence a new kind of dissipative system where the crystalline state can be maintained only upon energy supply.

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“…The area of colloidal photonic crystals has exciting potential to greatly impact the optics field as the arrangement of colloidal aggregations can theoretically manipulate visible and near‐infrared light . Recent work has focused on the synthesis and characterization of such structures where crystals are created through one of many colloid self‐assembly processes .…”

Section: Introductionmentioning

confidence: 99%

Characterization of 2D colloid aggregations created by optically induced electrohydrodynamics

Work

Williams

2015

Electrophoresis

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Rapid electrokinetic patterning (REP) is a technique for creating self-assembled monolayers (SAMs) of spherical particles in a liquid medium, and dynamically controlling them though the simultaneous application of an electric field and optically induced temperature gradients. Previous work has investigated and characterized REP axisymmetric aggregations generated from a focus laser within a uniform electric field; work herein characterizes line-shaped particle assemblies derived from the application of a linearly scanned laser. The resulting aggregations of spherical polystyrene particles (1 μm) suspended in low-conductivity aqueous potassium chloride solution (KCl, 2.5 mS/m) resembled elliptical-shaped crystalline geometries. The mean particle-to-particle spacing within the aggregation remained greater than 1.5 diameters for experiments herein (6.5 Vrms , 30 kHz) due to dipole-dipole repulsive forces. Interparticle spacing demonstrated a linear relationship (1.6-2.1 μm) with increasing scanning lengths (up to 83 μm), decreased from 1.9 to 1.7 μm with increasing scanning frequency (0.38-16 Hz) for a 53 μm scan length, and decreased from 2.0 to 1.6 μm with increasing laser power (11.9-18.8 mW) for a 59 μm, 16 Hz laser scan.

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Spatially and temporally reconfigurable assembly of colloidal crystals

Cited by 62 publications

References 36 publications

Color and Texture Morphing with Colloids on Multilayered Surfaces

Color and Texture Morphing with Colloids on Multilayered Surfaces

Photoswitchable Dissipative Two‐Dimensional Colloidal Crystals

Characterization of 2D colloid aggregations created by optically induced electrohydrodynamics

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