Fabrication of Gold Microwires by Drying Gold Nanorods Suspensions

Kurimura, Tomo; Takenaka, Yasuhiro; Kidoaki, Satoru; Ichikawa, Masatoshi

doi:10.1002/admi.201601125

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…This outward capillary flow disrupts the uniformity of the deposit, which is problematic for the advanced and extensive applications of inkjet technologies 5–10 . Therefore, controlling the deposit pattern is the key issue and numerous studies have been devoted to the suppression of the coffee-ring effect with electrowetting 11 , high-aspect-ratio particles 12,13 , evaporation speeds 14 , photosensitive surfactants 15,16 , and various mixtures of surfactants and polymers 17 ; however, our knowledge is still limited regarding costs, simplicity, and invasiveness 1 .…”

Section: Introductionmentioning

confidence: 99%

Suppression of the coffee-ring effect by sugar-assisted depinning of contact line

Shimobayashi

Tsudome

Kurimura

2018

Sci Rep

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Inkjet printing is of growing interest due to the attractive technologies for surface patterning. During the printing process, the solutes are transported to the droplet periphery and form a ring-like deposit, which disturbs the fabrication of high-resolution patterns. Thus, controlling the uniformity of particle coating is crucial in the advanced and extensive applications. Here, we find that sweet coffee drops above a threshold sugar concentration leave uniform rather than the ring-like pattern. The evaporative deposit changes from a ring-like pattern to a uniform pattern with an increase in sugar concentration. We moreover observe the particle movements near the contact line during the evaporation, suggesting that the sugar is precipitated from the droplet edge because of the highest evaporation and it causes the depinning of the contact line. By analyzing the following dynamics of the depinning contact line and flow fields and observing the internal structure of the deposit with a FIB-SEM system, we conclude that the depinned contact line recedes due to the solidification of sugar solution without any slip motion while suppressing the capillary flow and homogeneously fixing suspended particles, leading to the uniform coating. Our findings show that suppressing the coffee-ring effect by adding sugar is a cost-effective, easy and nontoxic strategy for improving the pattern resolution.

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Section: Introductionmentioning

confidence: 99%

Suppression of the coffee-ring effect by sugar-assisted depinning of contact line

Shimobayashi

Tsudome

Kurimura

2018

Sci Rep

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“…[6,7] Evaporation is useful in many practical life situations and researchers have used the principle to control drop shapes on surfaces and assemble unprecedented nanostructured materials, [9][10][11][12][13][14][15] for example to fabricate microwires from colloidal suspensions of silica nanoparticles (SNP). [16,17] Further, microwires are employed in special applications, including accurate sensors within the field of optics. [18][19][20] Thus, understanding the evaporation mechanism of the colloidal droplet may lead to the fabrication of nanostructured materials with precise control.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the evaporation route of a liquid droplet on Au coated and non-coated glass surfaces

2022

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The contact angle was used to estimate the rate of evaporation of liquid droplets on bare glass or gold (Au) sputtered glass surfaces. The rate of evaporation of water (a pure liquid) was higher than non-pure liquid composed of a 3 wt% solution of silica nanoparticles (SNP) on these two solid supports. Despite using the same initial drop volume (1 µL) throughout the experiment, the base diameter of the liquid droplet after evaporation on the different surfaces interestingly showed variations. While the liquid-solid interface displayed slip-length and contact angle variations throughout the evaporation time, the slip-length variations were more pronounced with colloidal SNP on Au-sputtered glass surfaces than pure liquid on bare glass surface. Potential application of this study was also investigated in the surface control of uniform silica microwires from colloidal SNP on Au-sputtered glass surface under low temperature conditions.

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Self‐Organization via Dewetting in Polymeric Assemblies

Nam,

Lee

2024

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Dewetting is a spontaneous process involving a thin liquid film that minimizes interfacial energy by reducing the surface area via the generation of defects on the film. In industry, dewetting is regarded as a problem that results in defects or a heterogeneous surface; however, in this study, dewetting is intentionally induced to create various patterns at intended positions spontaneously with polymeric materials and nanoparticles. The dewetting‐induced patterning process is conducted by controlling the capillary force and evaporation ratio through an evaporative self‐assembly system. The linear‐polymeric arrays on the substrate played an important role in modifying the surface geometry and treatment for a heterogeneous surface, and an additional patterning process is performed on patterned arrays to create dewetting‐induced self‐organizing patterns. Here, this method is used to introduce material arrays with specific shapes such as dots, dumbbells, potbellies, Vs, and trapezoids.

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Fabrication of Gold Microwires by Drying Gold Nanorods Suspensions

Cited by 4 publications

References 29 publications

Suppression of the coffee-ring effect by sugar-assisted depinning of contact line

Suppression of the coffee-ring effect by sugar-assisted depinning of contact line

Evaluation of the evaporation route of a liquid droplet on Au coated and non-coated glass surfaces

Self‐Organization via Dewetting in Polymeric Assemblies

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