Repelling hot water from superhydrophobic surfaces based on carbon nanotubes

Wan, Fang Xin; Yang, De‐Quan; Sacher, E.

doi:10.1039/c5ta05231a

Cited by 73 publications

(35 citation statements)

References 32 publications

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“…However, there are few works reporting on such type superhydrophobic surface. Yang and co‐workers constructed a hot water‐repellent superhydrophobic surfaces based on carbon nanotubes and organic silicone resin. The as‐prepared surfaces maintained their low SAs (<5°) but their CAs fell to ≈145°, i.e., losing the superhydrophobicity, when the temperature of water droplet was higher than 30 °C.…”

Section: Resultsmentioning

confidence: 99%

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Abrasion‐Resistant, Hot Water‐Repellent and Self‐Cleaning Superhydrophobic Surfaces Fabricated by Electrophoresis of Nanoparticles in Electrodeposited Sol–Gel Films

Xue-fen

Zhao

2017

Adv Materials Inter

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superhydrophobic surface with fluorinefree chemicals, most of these methods focus on the functionalized nanoparticles (NPs) at strict conditions, e.g., refluxing in toluene containing particles and modifier at N 2 atmosphere. [26][27][28] Therefore, it is still necessary to develop new methods to prepare superhydrophobic NPs at a much more moderate condition.Another severe problem lies in most superhydrophobic surfaces that are prone to be easily damaged by mechanical abrasion and finger touch due to the destruction of fragile microscopic roughness features [29,30] or the loss of low energy surface material, [31] which greatly limits their practical use. Most of the recent works focus on creating mechanically stable superhydrophobic surfaces from the polymeric substrates (like fabric or cotton). [32][33][34][35] Robust superhydrophobic surfaces constructed on hard substrates, however, are still a great challenge. [36] One strategy is to introduce lowsurface-energy polymers in the nanocomposite coating. [37,38] However, consideration still should be taken like the wear resistant ability and thermal stability of the polymer, the compatibility between NPs and polymeric matrix, and the adhesion strength of the polymer to the substrate. [39] Another strategy is to create microscopic roughness from the bulk matrix materials themselves at the surfaces like chemical etching, [40] plasma texturing, [41] laser ablating [42] on metal and its alloy. The comprising part of matrix materials to create the required micro/ nanostructure is destructive to the substrates and the required special and expensive equipment also limits their use.In order to resolve the above-mentioned two problems, in the present work, a much more cost-effective and environmentfriendly synthesis route is developed to generate fluorine-free superhydrophobic NPs (silica particles used as model in this work) at room temperature by using long-chain alkyl organosilane as the low-surface energy modifier. Furthermore, the mechanical durability of the superhydrophobic surfaces is guaranteed by using the electrochemically generated SiO 2 (e-SiO 2 ) films as the robust matrix of the superhydrophobic NPs. The superhydrophobic SiO 2 (SH-SiO 2 ) nanoparticles are deposited into highly porous e-SiO 2 films by electrophoresis. The proofof-concept is shown in Figure 1. The robust structure of e-SiO 2 film is ensured by the production of OH − ion catalyst near the electrode surface, i.e. the additional driving force for film growth, when applying cathodic potentials. [43] And the high porosity is a result of the separation of gelation process from The present work reports on a new strategy for fabrication of mechanically stable and environmental-friendly superhydrophobic surfaces. First, a novel cost-effective approach is developed to synthesize superhydrophobic SiO 2 (SH-SiO 2 ) nanoparticles at room temperature through the reaction between the surface reactive groups on commercial SiO 2 nanoparticles and the longchain alkyl fluorine-free organosilane. Then, the superh...

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Section: Resultsmentioning

confidence: 99%

“…The measurements of CAs and SAs for hot water were slightly different from that for room‐temperature water and more details can be found in ref. . As the temperature of hot liquid drops decreases quickly, it is difficult to get the real temperature of hot water droplets on the surfaces.…”

Section: Methodsmentioning

confidence: 99%

Abrasion‐Resistant, Hot Water‐Repellent and Self‐Cleaning Superhydrophobic Surfaces Fabricated by Electrophoresis of Nanoparticles in Electrodeposited Sol–Gel Films

Xue-fen

Zhao

2017

Adv Materials Inter

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confidence: 99%

“…Previous studies have mainly been focused on the fabrication of hot-water super-repellent surfaces, such as by spray coating, deposition, and electrophoresis-assisted coating, and their applications for self-cleaning and oil/water separation, [7][8][9][10][11][12][13][14][15] whereas only a few studies have reported on wetting mechanisms by hot water. Previous studies have mainly been focused on the fabrication of hot-water super-repellent surfaces, such as by spray coating, deposition, and electrophoresis-assisted coating, and their applications for self-cleaning and oil/water separation, [7][8][9][10][11][12][13][14][15] whereas only a few studies have reported on wetting mechanisms by hot water.…”

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confidence: 99%

Topography‐Directed Hot‐Water Super‐Repellent Surfaces

2019

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Natural and artificial super‐repellent surfaces are frequently textured with pillar‐based discrete structures rather than hole‐based continuous ones because the former exhibits lower adhesion from the reduced length of the three‐phase contact line. Counterintuitively, here, the unusual topographic effects are discovered on hot‐water super‐repellency where the continuous microcavity surface outperforms the discrete microneedle/micropillar surface. This anomaly arises from the different dependencies of liquid‐repellency stability on the surface structure and water temperature in the two topographies. The unexpected wetting dynamics are interpreted by determining timescales for droplet evaporation, vapor condensation, and droplet bouncing. The associated heat transfer process is unique to the wetting states and remarkably distinct from each other in the two topographies. It is envisioned that hot‐water super‐repellent microcavity surfaces will be advantageous for a variety of applications, especially when both self‐cleaning and thermal insulation are imperative, such as clothing for scald protection and digital microfluidics for exothermic reactions.

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“…In addition, many superhydrophobic/superoleophilic materials exhibited low repellency against hot water of 50 °C or higher . It has been recently reported that candle soot and silica‐coated suerhydrophobic/superoleophilic meshes could repel hot water of 92 °C .…”

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confidence: 99%