Liquid Marble Patchwork on Super‐Repellent Surface

Tenjimbayashi, Mizuki; Samitsu, Sadaki; Watanabe, Yuko; Nakamura, Yasuyuki; Naito, Masanobu

doi:10.1002/adfm.202010957

Cited by 22 publications

(28 citation statements)

References 49 publications

(80 reference statements)

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“…Superhydrophobicity is a type of wettability tending to repel a drop of water with contact angles above 150°, a contact angle hysteresis below 10° (difference between the advancing and receding angle), a sliding angle of less than 5°, and high stability in the Cassie-Baxter state (i.e. presence of air trapped between the surface and the water droplet) [ 15 , 16 ]. In nature, superhydrophobic surfaces have a hierarchical structure at the micro-and nanometric scale [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic SLA 3D printed materials modified with nanoparticles biomimicking the hierarchical structure of a rice leaf

Barraza

Olate‐Moya

Montecinos

et al. 2022

Science and Technology of Advanced Materials

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The rice leaf, combining the surface properties of lotus leaves and shark skin, presents outstanding superhydrophobic properties motivating its biomimesis. We created a novel biomimetic rice-leaf superhydrophobic surface by a three-level hierarchical structure, using for a first time stereolithographic (SLA) 3D printed channels (100µm width) with an intrinsic roughness from the printing filaments (10µm), and coated with TiO 2 nanoparticles (22 and 100nm). This structure presents a maximum advancing contact angle of 165° characterized by lower both anisotropy and hysteresis contact angles than other 3D printed surfaces, due to the presence of air pockets at the surface/water interface (Cassie-Baxter state). Dynamic water-drop tests show that the biomimetic surface presents self-cleaning, which is reduced under UV-A irradiation. The biomimetic surface further renders an increased floatability to 3D printed objects meaning a drag-reduction due to reduced water/solid contact area. Numerical simulations of a channel with a biomimetic wall confirm that the presence of air is essential to understand our results since it increases the average velocity and decreases the friction factor due to the presence of a wall-slip velocity. Our findings show that SLA 3D printing is an appropriate approach to develop biomimetic superhydrophobic surfaces for future applications in anti-fouling and drag-reduction devices.

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Section: Introductionmentioning

confidence: 99%

Superhydrophobic SLA 3D printed materials modified with nanoparticles biomimicking the hierarchical structure of a rice leaf

Barraza

Olate‐Moya

Montecinos

et al. 2022

Science and Technology of Advanced Materials

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“…A wide variety of solid particles, including organic, inorganic, and organic–inorganic composite particles, have been utilized as an LM stabilizer, provided that their surfaces are sufficiently hydrophobic. − In recent years, stimulus-responsive LMs, whose stability, structure, shape, and movement can be controlled by the application of an external stimulus, including temperature, pH, light, ultrasonic waves, and magnetic and electric fields, have received increased attention . Thanks to their stimulus-responsive characters, the LMs gained great interest in a wide range of technologically relevant applications such as microfluidics, miniature reactors, − microcentrifuges, sensors, − material delivery carriers, − and pressure-sensitive adhesives . One of the greatest challenges is the introduction of double stimulus-responsive character to the LMs because some applications might require an independent response to several factors. ,, Among the types of stimulus-responsive modes, disruption of the LMs by application of external stimulus has attained considerable interest because the on-demand release of inner content can be realized. , Most of such LMs developed previously disintegrated when the hydrophilic–hydrophobic balance of the surface of stabilizer adsorbed on the LM surface is changed from hydrophobic to hydrophilic by external stimulus, causing the stabilizer to desorb from the surface of the LMs.…”

Section: Introductionmentioning

confidence: 99%

Photo/Thermo Dual Stimulus-Responsive Liquid Marbles Stabilized with Polypyrrole-Coated Stearic Acid Particles

Tsumura

Oyama

Fameau

et al. 2022

ACS Appl. Mater. Interfaces

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In this study, we report on the fabrication of photo/thermo dual stimulus-responsive liquid marbles (LMs) that can be disrupted by light irradiation and/or heating. To stabilize the LMs, we synthesized micrometer-sized stearic acid (SA) particles coated with overlayers of polypyrrole (PPy) by aqueous chemical oxidative seeded dispersion polymerization. The SA/PPy core–shell particles could adsorb at the air–water interface to stabilize LMs by rolling water droplets on the particle powder bed. The presence of SA, known as a phase-change material, which undergoes a transition from solid to liquid by heating, and PPy, which can transduce light to heat, gives rise to the photo and thermo dual stimulus-responsive characters of the LMs. The disruption of the LMs could be induced in a cascade manner: light irradiation on the LM induced a temperature increase, followed by melting of the SA component on the LM surface, leading to its disruption and release of the inner water. The disruption time is linked to the PPy loading and light irradiation power, and it can be tuned from quasi-instantaneous to a few tens of seconds. The melting of SA due to a light-induced phase change from the solid to liquid state is a new mechanism to trigger the disruption of LMs. We finally demonstrated two applications of the LMs as a light-responsive microreactor and a sensor.

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“…The rapid and complete removal of liquids from surfaces is essential for applications such as anti‐fouling, anti‐icing, anti‐bacterial coatings, water harvesting, and droplet manipulation. [ 1–3 ] To repel liquids with low sliding angles, superhydrophobic [ 4–6 ] and superomniphobic surfaces [ 7–9 ] have been proposed. Such surfaces are achieved by a controlled nano‐ to micrometer‐scale surface texture with low surface energy.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Single‐Step Wet‐Process Formation of Dual‐Layer Superslippery Coating with Transparency and Robust Omniphobicity

Tenjimbayashi

Hayase

Hiroi

et al. 2022

Adv Materials Inter

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repel liquids with low sliding angles, superhydrophobic [4][5][6] and superomniphobic surfaces [7][8][9] have been proposed. Such surfaces are achieved by a controlled nano-to micrometer-scale surface texture with low surface energy. In particular, to achieve superomniphobicity, re-entrant structures with surface fluorination or doubly re-entrant structures are required. [7][8][9] On these surfaces, the droplet−surface contact area is minimized by introducing an air layer between the droplet and the fine-textured surfaces, causing the liquid droplet to roll off the surfaces. [10] This so-called Cassie state is metastable and can collapse under external pressure. Moreover, these surfaces are typically opaque and fragile due to the surface rough structure. [9,11] Notwithstanding the development of functional superhydrophobic/superomniphobic surfaces, the design of these surfaces still requires highly controlled methods, [12] and there is still a limitation in the repellence of low surface energy liquids (e.g., solvents and fluorine agents), mechanical durability, and stability under pressure. [13] Another type of liquid-repellent surface, liquid-infused surfaces (LIS), [13][14][15] repel liquids by introducing a stable lubricant layer (LL) on the solid surface. On LIS, an immiscible liquid droplet slides off because of the lubricity of the surface. A LIS comprises two layers: i) lubricant stabilizing base layer (BL) and ii) LL on top of it. The BL is a nano -to-micrometer porous solid with a high affinity to the lubricant designed by self-assembling nanomaterials, phase separations, templating, crystal growth, and etching processes. [16] The LL comprises a nonvolatile inert liquid, such as silicone oil, fluorinated polymer, fatty acid, or liquid paraffin, [17] and it is formed by simply casting, spreading the lubricant on the BL, and removing the excess by shearing the lubricant or tilting the BL. Further, through appropriate material selection, it is possible to realize optical transparency and a self-repairing function. [13,14] Overall, LIS is promising for achieving a robust omniphobic surface. In particular, the facile preparation of the LIS while maintaining the LIS function is promising. Efforts have been made toward the facile preparation of LIS for practical use. [18,19] However, two-step coating processes are required in most cases to form LIS as it comprises two layers of BL and LL. The twostep coating method requires more processing time and cost Robust coatings that fully repel liquids have a broad range of applications. However, it remains challenging to have an easy, scalable, and substrateindependent preparation method for these coatings. Here, a coating solution that forms stable lubricant surface-to-solid substrates simply by casting, dipping, or spraying without specific limitation in the substrate, is synthesized. Moreover, the coating is formed inside the long narrow tube by flowing the solution. The solution constitutes nanoparticles, a silicone binder, and a binary mixture of a lubricant and a...

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Liquid Marble Patchwork on Super‐Repellent Surface

Cited by 22 publications

References 49 publications

Superhydrophobic SLA 3D printed materials modified with nanoparticles biomimicking the hierarchical structure of a rice leaf

Superhydrophobic SLA 3D printed materials modified with nanoparticles biomimicking the hierarchical structure of a rice leaf

Photo/Thermo Dual Stimulus-Responsive Liquid Marbles Stabilized with Polypyrrole-Coated Stearic Acid Particles

Single‐Step Wet‐Process Formation of Dual‐Layer Superslippery Coating with Transparency and Robust Omniphobicity

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