One-Step Eco-Friendly Superhydrophobic Coating Method Using Polydimethylsiloxane and Ammonium Bicarbonate

Kim, Seongmin; Lee, Jeong‐Won; Hwang, Woonbong

doi:10.1021/acsami.0c06697

Cited by 30 publications

(17 citation statements)

References 43 publications

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“…The decomposition of ammonium bicarbonate (NH 4 HCO 3 ) produces ammonia (NH 3 ), carbon dioxide (CO 2 ), and water vapour (H 2 O). The decomposition of ammonium bicarbonate is shown in Equation (4) [ 24 ]. When a higher amount of ammonium bicarbonate was added, higher volumes of ammonia, carbon dioxide, and water vapour were generated [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

Development of Porous Epoxy Micro-Beads Using Ammonium Bicarbonate through a Single Epoxy Droplet in Corn Oil

et al. 2021

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This paper explored the effects of ammonium bicarbonate and different ratios of epoxy to polyamide on the formation of porous epoxy micro-beads through a single epoxy droplet. A single drop of a mixture, consisting of epoxy, polyamide, and ammonium bicarbonate, was dropped into heated corn oil at a temperature of 100 °C. An epoxy droplet was formed due to the immiscibility of the epoxy mixture and corn oil. The ammonium bicarbonate within this droplet underwent a decomposition reaction, while the epoxy and polyamide underwent a curing reaction, to form porous epoxy micro-beads. The result showed that the higher ammonium bicarbonate content in the porous, epoxy micro-beads increased the decomposition rate up to 11.52 × 10−3 cm3/s. In addition, a higher total volume of gas was generated when a higher ammonium bicarbonate content was decomposed. This led to the formation of porous epoxy micro-beads with a smaller particle size, lower specific gravity, and better thermal stability. At an epoxy to polyamide ratio of 10:6, many smaller micro-beads, with particle sizes ranging from 201 to 400 μm, were obtained at an ammonium bicarbonate content of 10 phr. Moreover, the porous epoxy micro-beads with open pores were shown to have a low specific gravity of about 0.93 and high thermal stability at a high ammonium bicarbonate content. Based on the findings, it was concluded that porous epoxy micro-beads were successfully produced using a single epoxy droplet in heated corn oil, where their shape and particle size depended on the content of ammonium bicarbonate and the ratio of epoxy to polyamide used.

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Section: Resultsmentioning

confidence: 99%

Development of Porous Epoxy Micro-Beads Using Ammonium Bicarbonate through a Single Epoxy Droplet in Corn Oil

et al. 2021

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“…The apparent contact angle

can be expressed as follows:

where

is Young’s contact angle at a flat surface and

is the fraction of the area of the solid in contact with liquid. Superhydrophobic surfaces exhibit extreme water repulsion, which stems from the micro/nanostructure of the surface [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Such surfaces can give rise to self-cleaning, anti-frosting, and anti-corrosion properties, which renders them attractive for applied materials research [ 5 , 6 , 15 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Structure Complexity on Interfacial Droplet Behavior of Superhydrophobic Titanium Surfaces for Robust Dropwise Condensation

Jeong

Lee

et al. 2021

Materials

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In general, the dropwise condensation supported by superhydrophobic surfaces results in enhanced heat transfer relative to condensation on normal surfaces. However, in supersaturated environments that exceed a certain supersaturation threshold, moisture penetrates the surface structures and results in attached condensation, which reduces the condensation heat transfer efficiency. Therefore, when designing superhydrophobic surfaces for condensers, the surface structure must be resistant to attached condensation in supersaturated conditions. The gap size and complexity of the micro/nanoscale surface structure are the main factors that can be controlled to maintain water repellency in supersaturated environments. In this study, the condensation heat exchange performance was characterized for three different superhydrophobic titanium surface structures via droplet behavior (DB) mapping to evaluate their suitability for power plant condensers. In addition, it was demonstrated that increasing the surface structure complexity increases the versatility of the titanium surfaces by extending the window for improved heat exchange performance. This study demonstrates the usefulness of DB mapping for evaluating the performance of superhydrophobic surfaces regarding their applicability for industrial condenser systems.

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“…Generally, two types of filters (superhydrophobic and superhydrophilic filter) are used to treat oily water. Due to its selective permeability, a superhydrophobic filter can be used to purify oily water; − however, its oleophilic nature results in oil contamination and the severe deterioration of filtering performance, which hinders its effective use in the industry. , On the other hand, due to its hydration layer, a superhydrophilic filter does not directly contact with oil; hence, the filter surface does not become contaminated by oil. , Consequently, a superhydrophilic filter can be effectively used to treat oily water …”

Section: Introductionmentioning

confidence: 99%

One-Step Versatile Fabrication of Superhydrophilic Filters for the Efficient Purification of Oily Water

et al. 2021

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As industrial oily wastewater can seriously damage ecosystems, the use of filtration technology with functional filters has emerged as an effective approach for purifying oily wastewater and protecting the environment. Although several methods for preparing functional filters with specific wettability have been reported, most methods are complicated, expensive, and timeconsuming. Furthermore, these methods are only applicable to specific substrates, which hinder their practical applications. Here, a simple and versatile method for the fabrication of a superhydrophilic filter on any substrate using a one-step dipping process is reported. The method is easily scaled-up to fabricate large-area superhydrophilic filters; moreover, mass production is possible using a roll-to-roll process. The resulting filter is durable, stable, and, due to its stable hydrophilic layer, shows no deterioration in wetting behavior; it also exhibits self-cleaning properties. Based on its selective wetting characteristics, oil/water mixtures and oil-inwater emulsions stabilized by surfactants can be purified in a highly efficient manner. Importantly, owing to its self-cleaning properties, the filter can be reused after simply immersing and washing in water. This easy, cost-effective, fast, and versatile method for fabricating superhydrophilic filters can be practically applied in industries that need to purify oily water.

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One-Step Eco-Friendly Superhydrophobic Coating Method Using Polydimethylsiloxane and Ammonium Bicarbonate

Cited by 30 publications

References 43 publications

Development of Porous Epoxy Micro-Beads Using Ammonium Bicarbonate through a Single Epoxy Droplet in Corn Oil

Development of Porous Epoxy Micro-Beads Using Ammonium Bicarbonate through a Single Epoxy Droplet in Corn Oil

Effect of Surface Structure Complexity on Interfacial Droplet Behavior of Superhydrophobic Titanium Surfaces for Robust Dropwise Condensation

One-Step Versatile Fabrication of Superhydrophilic Filters for the Efficient Purification of Oily Water

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