Periodic Parallel Array of Nanopillars and Nanoholes Resulting from Colloidal Stripes Patterned by Geometrically Confined Evaporative Self-Assembly for Unique Anisotropic Wetting

Li, Xiangmeng; Wang, Chunhui; Shao, Jinyou; Ding, Yucheng; Tian, Hongmiao; Wang, Li

doi:10.1021/am505835z

Cited by 17 publications

(10 citation statements)

References 44 publications

(87 reference statements)

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“…[32][33][34][35][36] However, restraining the liquid, using physical confinement, is known to yield well organized deposits. 35 Examples for such confinements are the square-pyramid/wedge-on-flat, 36 sphere-on-flat, 8,37,38 ring-on-flat 39,40 and cylinder-on-flat 41 geometries as well as two parallel 29,42,43 or tilted plates, crossed cylinders, 44 and capillary tubes. 45 Recent reviews of different aspects of these systems are given elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Connecting Monotonic and Oscillatory Motions of the Meniscus of a Volatile Polymer Solution to the Transport of Polymer Coils and Deposit Morphology

et al. 2018

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We study the deposition mechanisms of polymer from a confined meniscus of volatile liquid. In particular, we investigate the physical processes that are responsible for qualitative changes in the pattern deposition of polymer and the underlying interplay of the state of pattern deposition, motion of the meniscus, and the transport of polymer within the meniscus. As a model system we evaporate a solution of poly(methyl methacrylate) (PMMA) in toluene. Different deposition patterns are observed when varying the molecular mass, the initial concentration of the solute, and temperature; these are systematically presented in the form of morphological phase diagrams. The modi of deposition and meniscus motion are correlated. They vary with the ratio between the evaporation-driven convective flux and the diffusive flux of the polymer coils in the solution. In the case of a diffusion-dominated solute transport, the solution monotonically dewets the solid substrate by evaporation, supporting continuous contact line motion and continuous polymer deposition. However, a convection-dominated transport results in an oscillatory ratcheting dewetting-wetting motion of the contact line with more pronounced dewetting phases. The deposition process is then periodic and produces a stripe pattern. The oscillatory motion of the meniscus differs from the well documented stick-slip motion of the meniscus, observed as well, and is attributed to the opposing influences of evaporation and Marangoni stresses, which alternately dominate the deposition process.

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Section: Introductionmentioning

confidence: 99%

Connecting Monotonic and Oscillatory Motions of the Meniscus of a Volatile Polymer Solution to the Transport of Polymer Coils and Deposit Morphology

et al. 2018

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“…の機能を発現することが知られており，センサー [1]，反射防止膜 [2,3]，アンチグレアフィルム [4]，太陽電池の効率向上 [5,6]など，幅広い分野での応用が期待される。さらに，単層膜を鋳型として用いることでナノ構造を作製する，いわゆるコロイドリソグラフィのマスクとしての用途も報告されている [7]。コロイドリソグラフィによって得られる集合体の典型例は，三角形 [8]，円盤 [9]，柱 [10]，円錐 [11]，三日月 [12] Corresponding Authors *nabe@cheme.kyoto-u.ac.jp **miyahara@cheme.kyoto-u.ac.jp 積を利用したボトムアップ型の手法が望ましく，これまでに，液滴乾燥法 [14]，Langmuir-Blodgett 法 [15]，スピンコート法 [16]，移流集積法 [17,18] (Fig. 4 (a) (Fig.…”

Section: 緒言コロイド粒子が規則的に配列した単層膜は，粒子の種類やサイズに応じて，その構造の規則性に起因した種々unclassified

Monolayer Formation of Submicron-sized Colloidal Particles by Drag Coating Convective Self-assembly

et al. 2018

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Monolayer films composed of ordered particle arrays exhibit unique optical properties, which lead to various potential applications like sensors and antireflective coatings. In this study, we investigated particle deposition processes by using a drag coating technique based on convective self-assembly. Unlike micron-sized particles, 300-nm particles formed submonolayers instead of monolayers. Hence, we modified the technique and demonstrated that reversed dragging, introduction of a film blade, and periodic change in deposition speed dramatically improved the particle deposition process to cover the entire substrate surface uniformly with a monolayer of ordered particle arrays. Furthermore, our modified drag coating process produced monolayers of particles with different sizes of 570, 120, 45, and 27 nm. Thus, our technique is simple and versatile, and is applicable to a wide particle size ranging from microns to tens of nanometers.

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“…Many methods for obtaining structured deposits based on self-assembly of micro-and nanoparticles as a result of evaporation were proposed (e.g., [95,90,91,96,97,98,99,100,101,102,103,104] and many others). The studies in this direction are known as "Evaporative-induced self-assembly" (EISA).…”

Section: Introductionmentioning

confidence: 99%

“…For example, a plate is placed above the film. It can be a flat one [96,108,99,104]. Sometimes plate is characterized by varying curvature due to swelling [98].…”

Section: Introductionmentioning

confidence: 99%

Applying Droplets and Films in Evaporative Lithography

Kolegov,

Barash

2020

Preprint

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The review covers experimental results of evaporative lithography and analyzes existing mathematical models of this method. Evaporating droplets and films are applied in different fields, such as cooling of heated surfaces of electronic devices, diagnostics in health care, creation of transparent conductive coatings on flexible substrates, surface patterning. A method called evaporative lithography emerged after establishing the connection between the coffee ring effect taking place in drying colloidal droplets, and naturally occuring inhomogeneous vapor flow densities from fluid-vapor interfaces. Essential control of the colloidal particle deposit patterns is achieved in this method by producing ambient conditions that induce a nonuniform evaporation profile from the colloidal liquid surface. Evaporative lithography is part of a wider field, which is known as "Evaporative-induced self-assembly" (EISA). EISA involves methods based on the contact line processes, methods employing particle interaction effects and evaporative lithography. As a rule, evaporative lithography is a flexible and single-stage process with such advantages as simplicity, low price and possibility of application to almost any substrate without pretreatment. Since no mechanical impact on a template is present in evaporative lithography, the template integrity is preserved in the process. The method is also useful for creating materials with localized functions, such as slipperiness and self-healing. For these reasons, evaporative lithography attracts increasing attention and has a number of noticeable achievements at present. We also analyze limitations of the approach and ways of its further development.

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Periodic Parallel Array of Nanopillars and Nanoholes Resulting from Colloidal Stripes Patterned by Geometrically Confined Evaporative Self-Assembly for Unique Anisotropic Wetting

Cited by 17 publications

References 44 publications

Connecting Monotonic and Oscillatory Motions of the Meniscus of a Volatile Polymer Solution to the Transport of Polymer Coils and Deposit Morphology

Connecting Monotonic and Oscillatory Motions of the Meniscus of a Volatile Polymer Solution to the Transport of Polymer Coils and Deposit Morphology

Monolayer Formation of Submicron-sized Colloidal Particles by Drag Coating Convective Self-assembly

Applying Droplets and Films in Evaporative Lithography

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