Superhydrophobic coating modified nozzles for energy-saving rapid micro-mixing

Zhang, Qian; Gao, Ge; Lu, Guoxin; Shao, Lei; Shi, Feng; Jiang, Lei; Cheng, Mengjiao

doi:10.1016/j.cej.2021.129766

Cited by 12 publications

(11 citation statements)

References 36 publications

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“…To address the problem of the short lifetime of concentration-dependent Marangoni devices, we have designed a single-engine Marangoni rotor by using the common surfactant of SDS as fuel. As schematically illustrated in Figure a, the rotor consists of (1) a superhydrophobic arm as the main body with drag-reducing properties, , (2) a superhydrophilic mesh to both hold the fuel and make water-fuel contact, and (3) a fuel block of SDS diluted by lactose for slow release. The integration of these components allows for continuous self-propulsion of the rotor on a solution of β-cyclodextrin (β-CD) according to the following mechanism: the slow release of SDS onto the air/water interface creates a concentration difference of SDS and thus a surface tension gradient at the front and back sides of the arm end, leading to Marangoni flows that propel the rotor; the presence of β-CD in solutions favors timely removal of excessive interfacial adsorption of SDS because the complex of β-CD/SDS via molecular recognition is water-soluble and has no surface activity. , The above fine equilibrium of interfacial adsorption/desorption of SDS could maintain a relatively stable surface tension gradient for a prolonged motion lifetime.…”

Section: Resultsmentioning

confidence: 99%

A Multi-engine Marangoni Rotor with Controlled Motion for Mini-Generator Application

Zhu

Peng

et al. 2023

ACS Appl. Mater. Interfaces

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Marangoni rotors are smart devices that are capable of self-propulsive motions based on the Marangoni effect, namely interfacial flows caused by a gradient of surface tension. Owing to the features of untethered motions and coupled complexity with fluid, these Marangoni devices are attractive for both theoretical study and applications in biomimicking, cargo delivery, energy conversion, etc. However, the controllability of Marangoni motions dependent on concentration gradients remains to be improved, including the motion lifetime, direction, and trajectories. The challenge lies in the flexible loading and adjustments of surfactant fuels. Herein, we design a multi-engine device in a six-arm shape with multiple fuel positions allowing for motion control and propose a strategy of diluting the surfactant fuel to prolong the motion lifetime. The resulting motion lifetime has been extended from 140 to 360 s by 143% compared with conventional surfactant fuels. The motion trajectories could be facilely adjusted by changing both the fuel number and positions, leading to diverse rotation patterns. By integrating with a coil and a magnet, we obtained a system of mini-generators based on the Marangoni rotor. Compared with the single-engine case, the output of the multi-engine rotor was increased by 2 magnitudes owing to increased kinetic energy. The design of the above Marangoni rotor has addressed the problems of concentration-gradient-driven Marangoni devices and enriched their applications in harvesting energy from the environment.

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Section: Resultsmentioning

confidence: 99%

A Multi-engine Marangoni Rotor with Controlled Motion for Mini-Generator Application

Zhu

Peng

et al. 2023

ACS Appl. Mater. Interfaces

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“…In the whole process of oil extraction, production, and utilization, oil pollution originated from oil spills and oily wastewater discharge seriously poisons environment to harm human health. [1][2][3][4][5] An effective oil/water separation method is urgently needed to reduce and control the discharge of oil. The PAFcoated superhydrophobic fabric repels the water phase and remains dry, which has a visible phenomenon of mirror after being immersed in water solution (Figure S7, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…Superhydrophobic interfaces, defined by high water contact angle (WCA) value (>150°), have aroused wide interests for their practical utilization, such as water treatment, antifouling, and energy conversion. [1][2][3][4][5] With the increase in industrial demand, for instance, wastewater and oil spill accidents, the development of superhydrophobic substrates with high stability and durability is urgently demanded for effective separation and selective adsorption of oil pollution from water. [6][7][8] To cater to demand, various fabrication strategies have been investigated including electrospinning technique, [9] chemical etching, [10] self-assembly process, [11,12] hydrothermal method, [13] and others.…”

Section: Introductionmentioning

confidence: 99%

Bio‐Inspired Fabrication of Porous Aromatic Framework‐Coated Fabric for Achieving Durable Superhydrophobic Applications

Yan

Qiao

et al. 2022

Adv Materials Inter

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Porous aromatic frameworks (PAFs) composed of high‐density phenyl units are renowned for stable micro/meso‐porous architecture and highly hydrophobic surface, which make them ideal candidates for durable superhydrophobic applications, especially under harsh conditions. Herein, a carbazole‐based PAF solid is synthesized using carbazole and triphenylamine as the building units through the CC linking pattern. For the first time, the PAF powder is uniformly deposited on the fabric surface via a facile dip‐coating method, which thus shows superhydrophobicity with high water contact angle of 153.8° and oil contact angle of approximately 0°. Consequently, the PAF‐coated fabric displays an outstanding simple oil/water mixture and separation efficiency of over 96% and enables simple and time‐saving cyclic utilization at least 10 times. Due to the ultrahigh stability of PAF skeleton, the PAF‐based composite maintains high superhydrophobicity under extreme conditions including high temperature, high humidity, and strong acidic/alkaline solutions. These results delineate important research advances toward the implementation of PAF powder in superhydrophobic applications.

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“…In recent years, superhydrophobic surfaces have been of interest for their wide range of potential applications, such as self-cleaning, − oil/water separation, , anti-ice or corrosion surfaces, , drag reduction, , and energy conservation . Basically, a superhydrophobic surface is defined as having a static contact angle of more than 150° and a sliding angle of less than 10°.…”

Section: Introductionmentioning

confidence: 99%

Azeotropic Binary Solvent System Containing Nonfluorinated Polymer-Grafted Silica Nanoparticles for the Fabrication of a Superhydrophobic Surface

et al. 2023

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This study describes a method for fabricating a superhydrophobic surface on glass via a colloidal deposition technique based on solvent evaporation-induced aggregation. Silica nanoparticles with a low grafting density of long-chain poly-(cyclohexyl methacrylate) (PCH) were dispersed in a binary solvent system consisting of tetrahydrofuran (THF) and methanol (MeOH) with an azeotropic point and the nonfluorinated and hydrophobic PCHMA having a solubility parameter similar to that of THF. In the early stages of evaporation, the binary mixtures tend to induce the aggregation of PCH-NP due to the azeotropic point of the solvent components, leading to the formation of surface structures ranging from smooth to rough on the substrate. By adjusting the initial ratio of the binary solvents, a superhydrophobic coating with a water contact angle of 154 ± 2°and a sliding angle of less than 10°was achieved at a THF content of 60 wt %. This facile approach using azeotropes successfully shows that changes in the solvent composition of the binary solvent system during evaporation can be used to prepare superhydrophobic coatings with well-controlled surface structures.

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Superhydrophobic coating modified nozzles for energy-saving rapid micro-mixing

Cited by 12 publications

References 36 publications

A Multi-engine Marangoni Rotor with Controlled Motion for Mini-Generator Application

A Multi-engine Marangoni Rotor with Controlled Motion for Mini-Generator Application

Bio‐Inspired Fabrication of Porous Aromatic Framework‐Coated Fabric for Achieving Durable Superhydrophobic Applications

Azeotropic Binary Solvent System Containing Nonfluorinated Polymer-Grafted Silica Nanoparticles for the Fabrication of a Superhydrophobic Surface

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