Self-organized Archimedean spiral pattern: Regular bundling of fullerene through solvent evaporation

Chen, Yongjun; Suzuki, Kosuke; Mahara, Hitoshi; Yoshikawa, Kenichi; Yamaguchi, Tomohiko

doi:10.1063/1.4789906

Cited by 9 publications

(14 citation statements)

References 23 publications

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“…We confirm that the dynamics of the CC pattern formation is always reproduced in 10 independent samples. This formation dynamics is distinct from the stick and slip dynamics [23].…”

mentioning

confidence: 81%

“…Recently, we reported the formation of morphology when a drying sessile droplet of sodium bicarbonate solution with colloidal particles is pinned at the edge due to the coffee ring effect [21]. During evaporation of the solvent on a substrate, the colloids are first seen to aggregate at the edge a droplet by a spatially inhomogeneous evaporation rate [22,23]. Then, recrystallization is forced to occur from a thin layer due to the pinning; this leads to the formation of a concentric circle (CC) or an orchid (OR) pattern.…”

mentioning

confidence: 99%

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Formation mechanism of hierarchical structure of crystal morphology in a sessile droplet

Morinaga

Tani

Kurita

2020

Phys. Rev. Research

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Crystal patterns formed by evaporation play important roles in industrial technologies. Recently, it was found that a concentric pattern and an orchid pattern may be seen when a pinned sessile droplet dries. Due to complex coupling between evaporation and crystallization, the mechanism behind this unique recrystallization phenomenon is yet to be determined. Here, we investigate the formation of these macroscopic patterns using microscopy. Then we show that diffusion-limited aggregation, absorption, and dewetting from the substrate all play a role in its development. In addition, it is found that anisotropy of the core is a key parameter for the pattern formation on a long length scale.

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“…We confirm that the dynamics of the CC pattern formation is always reproduced in 10 independent samples. This formation dynamics is distinct from the stick and slip dynamics [23].…”

mentioning

confidence: 81%

mentioning

confidence: 99%

Formation mechanism of hierarchical structure of crystal morphology in a sessile droplet

Morinaga

Tani

Kurita

2020

Phys. Rev. Research

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“…The difference in evaporation rate induces flow from the center to the edge. In a similar spirit to studies of evaporating droplets with colloidal particles (coffee ring effect) 19 , 20 , the evaporation of droplets of water with dissolved salt has been investigated 21 – 28 . It was reported that a concentric pattern was formed by evaporation of a sessile droplet containing L-ascorbic acid 22 and bovine serum albumin 23 .…”

Section: Introductionmentioning

confidence: 99%

Emergence of different crystal morphologies using the coffee ring effect

Morinaga

Oikawa

Kurita

2018

Sci Rep

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Macroscopic patterns in nature formed during crystal growth e.g. snow crystals have a significant influence on many material properties, such as macroscopic heat conduction, electrical conduction, and mechanical properties, even with the same microscopic crystal structure. Although crystal morphology has been extensively studied in bulk, the formation of patterns induced by re-crystallization during evaporation is still unclear. Here, we find a way to obtain concentric circles, a dendritic pattern, and a lattice pattern by pinning the edge of droplets using the coffee ring effect; only aggregates of crystallites are seen in the absence of pinning. Our systematic study shows that the macroscopic patterns depend both on initial concentration and evaporation rate. In addition, our qualitative analysis suggests that the local concentration of solute at the center of the pattern is related to the macroscopic patterns.

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“…Figure 1 illustrates the drying method 14, 18 . A drop of the SWCNT solution is placed around a glass bead (Fig.…”

Section: Resultsmentioning

confidence: 99%

Self-Organized Micro-Spiral of Single-Walled Carbon Nanotubes

Mae

Toyama

Nawa-Okita

et al. 2017

Sci Rep

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Single-walled carbon nanotubes (SWCNTs) are reported to spontaneously align in a rotational pattern by drying a liquid droplet of toluene containing polyfluorene as a dispersant. By situating a droplet of an SWCNT solution around a glass bead, spiral patterns are generated. The parallel alignment of SWCNTs along one stripe of such a pattern is confirmed using scanning electron microscopy and polarized optical microscopy. The orientation order increases toward the outer edge of a stripe. The stripe width in the pattern is proportional to the solute concentration, and the width and position of the stripes follow geometric sequences. The growth of the rotational pattern is also observed in real time. The process of spiral pattern formation is visualized, indicating the role of the annihilation of counter-traveling accompanied by continuous depinning. The geometric sequences for the stripe width and position are explained by the near-constant traveling speed and solute enrichment at the droplet periphery.

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Self-organized Archimedean spiral pattern: Regular bundling of fullerene through solvent evaporation

Cited by 9 publications

References 23 publications

Formation mechanism of hierarchical structure of crystal morphology in a sessile droplet

Formation mechanism of hierarchical structure of crystal morphology in a sessile droplet

Emergence of different crystal morphologies using the coffee ring effect

Self-Organized Micro-Spiral of Single-Walled Carbon Nanotubes

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