Colloidal Stripe Pattern with Controlled Periodicity by Convective Self-Assembly with Liquid-Level Manipulation

Mino, Yasushi; Watanabe, Satoshi; Miyahara, Minoru

doi:10.1021/am300526g

Cited by 29 publications

(42 citation statements)

References 41 publications

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“…2) The second thrust leverages the existence of these defects to develop unique patterned structures and utilize them for potential applications (i.e., transparent conductive films, microfluidics, and sensor arrays). [36][37][38] However, many of these studies often underexplore the underlying physics of these defects, which can cause the samples to be difficult to replicate in different conditions. Small 2019, 15, 1804523 Figure 1.…”

Section: Self-assemblymentioning

confidence: 99%

“…Despite numerous efforts to fabricate perfect large‐scale colloidal crystals, it has been impossible to eliminate structural defects entirely. 2) The second thrust leverages the existence of these defects to develop unique patterned structures and utilize them for potential applications (i.e., transparent conductive films, microfluidics, and sensor arrays) . However, many of these studies often underexplore the underlying physics of these defects, which can cause the samples to be difficult to replicate in different conditions.…”

Section: Introductionmentioning

confidence: 99%

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The Control of Colloidal Grain Boundaries through Evaporative Vertical Self‐Assembly

Suh

Pham

Shao

et al. 2019

Small

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Self‐assembly continuously gains attention as an excellent method to create novel nanoscale structures with a wide range of applications in photonics, optoelectronics, biomedical engineering, and heat transfer applications. However, self‐assembly is governed by a diversity of complex interparticle forces that cause fabricating defectless large scale (>1 cm) colloidal crystals, or opals, to be a daunting challenge. Despite numerous efforts to find an optimal method that offers the perfect colloidal crystal by minimizing defects, it has been difficult to provide physical interpretations that govern the development of defects such as grain boundaries. This study reports the control over grain domains and intentional defect characteristics that develop during evaporative vertical deposition. The degree of particle crystallinity and evaporation conditions is shown to govern the grain domain characteristics, such as shapes and sizes. In particular, the grains fabricated with 300 and 600 nm sphere diameters can be tuned into single‐column structures exceeding ≈1 mm by elevating heating temperature up to 93 °C. The understanding of self‐assembly physics presented in this work will enable the fabrication of novel self‐assembled structures with high periodicity and offer fundamental groundworks for developing large‐scale crack‐free structures.

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Section: Self-assemblymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Control of Colloidal Grain Boundaries through Evaporative Vertical Self‐Assembly

Suh

Pham

Shao

et al. 2019

Small

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“…Evaporative self‐assembly (ESA) has been investigated and established to be a useful facile self‐assembly method for the fabrication of functional, well‐ordered, mesoscale assemblies, and complex higher order microstructures . Possible commercial applications for ESA include deposition of functional materials and patterning of surfaces .…”

Section: Introductionmentioning

confidence: 99%

“…INTRODUCTION Evaporative self-assembly (ESA) has been investigated and established to be a useful facile self-assembly method for the fabrication of functional, well-ordered, mesoscale assemblies, and complex higher order microstructures. [1][2][3][4][5][6][7][8] Possible commercial applications for ESA include deposition of functional materials and patterning of surfaces. 4,[9][10][11][12][13] Based on the "coffee-ring effect," ESA methods offer advantages such as being cost-effective, adaptable to different substrates, and use of different organic, inorganic, and bio-based materials.…”

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confidence: 99%

Controlled evaporative self‐assembly of polymer nanoribbons using oscillating capillary bridges

Choudhary

Crosby

2018

J Polym Sci B Polym Phys

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Evaporative self‐assembly (ESA), based on the “coffee‐ring” effect, is a versatile technique for assembling particle solutions into mesoscale patterns and structures on different substrates. ESA works with a wide variety of organic and inorganic materials, where the solution is a combination of volatile solvent and nonvolatile solute. Modified ESA methods, such as “stop‐and‐go flow coating,” use a programmed meniscus “stick–slip” motion to create mesoscale assemblies with controlled shape, size, and architecture. However, current methods are not scalable for increased production volumes or patterning large surface areas. We demonstrate a new ESA method, where an oscillating blade controls the meniscus depinning and drives the evaporative assembly of solutes at the pinned meniscus. Results show that oscillation frequency and substrate speed control time/distance intervals between successive meniscus depinning, and the assembly dimensions depend on solution concentration, oscillation frequency, substrate speed, and meniscus height. We report the mechanism of the meniscus depinning and the control over assembly cross‐sectional dimensions. This advance provides a scalable ESA method with faster processing times and maintained advantages. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 1545–1551

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“…38 In a recent study, particle stripe patterns with controllable periodicity were successfully generated by altering the particle dispersion liquid levels used to deposit the particles. 39 …”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Patterns of Poly(N-isopropylacrylamide) Microgels to Spatially Control Fibroblast Adhesion and Temperature-Responsive Detachment

Tsai¹,

Vats²,

Yates³

et al. 2013

Langmuir

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Thermoresponsive poly(N-isopropyl acrylamide) (PNIPAM) microgels were patterned on polystyrene substrates via dip coating, creating cytocompatible substrates that provided spatial control over cell adhesion. This simple dip coating method, which exploits variable substrate withdrawal speeds form particle suspension formed stripes of densely-packed PNIPAM microgels, while spacings between the stripes contained sparsely-distributed PNIPAM microgels. The assembly of three different PNIPAM microgel patterns, namely patterns composed of 50 μm stripes/50 μm spacings, 50 μm stripes/100 μm spacings, and 100 μm stripes/100 μm spacings was verified using high-resolution optical micrographs and ImageJ analysis. PNIPAM microgels existed as monolayers within stripes and spacings, as revealed by atomic force microscopy (AFM). Upon cell seeding on PNIPAM micropatterned substrates, NIH3T3 fibroblast cells preferentially adhered within spacings to form cell patterns. Three days after cell seeding, cells proliferated to form confluent cell layers. The thermoresponsiveness of the underlying PNIPAM microgels was then utilized to recover fibroblast cell sheets from substrates simply by lowering the temperature, without disrupting the underlying PNIPAM microgel patterns. Harvested cell sheets similar to these have been used for multiple tissue engineering applications. Also, this simple, low cost, template-free dip coating technique can be utilized to micropattern multifunctional PNIPAM microgels, generating complex stimuli-responsive substrates to study cell-material interactions and allow drug delivery to cells in a spatially and temporally-controlled manners.

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Colloidal Stripe Pattern with Controlled Periodicity by Convective Self-Assembly with Liquid-Level Manipulation

Cited by 29 publications

References 41 publications

The Control of Colloidal Grain Boundaries through Evaporative Vertical Self‐Assembly

The Control of Colloidal Grain Boundaries through Evaporative Vertical Self‐Assembly

Controlled evaporative self‐assembly of polymer nanoribbons using oscillating capillary bridges

Two-Dimensional Patterns of Poly(N-isopropylacrylamide) Microgels to Spatially Control Fibroblast Adhesion and Temperature-Responsive Detachment

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