Polydopamine-mediated all-in-one device with superhydrophilicity and superhydrophobicity for one-step oil/water separation and pollutant purification

Han, Nara; Lim, Yong Taek; Jang, Wooree; Koo, Hye Young; Choi, Won San

doi:10.1016/j.polymer.2016.11.004

Cited by 22 publications

(16 citation statements)

References 33 publications

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“…Figure a shows a schematic illustration of the one‐step switching of the superhydrophilic melamine formaldehyde sponge (SHphi‐MFS) to a superhydrophobic MFS (SHpho‐MFS) with pH tuning ability that was simply prepared by ultrasound treatment of the SHphi‐MFS at a low pH. The SHphi‐MFS has been used as a base material for oil/water separation due to its easy surface modification and excellent durability . The rate of switching the sponge from hydrophilic to hydrophobic can be controlled by varying the ultrasound treatment times (Figure b).…”

Section: Resultsmentioning

confidence: 99%

“…A piece of each sponge was dropped into a beaker containing a mixture of 40 mL of oil (hexane, styrene, diesel fuel, soybean oil, silicone oil, MF‐30, or Bunker C oil) and 40 mL of water. The absorption capacity of each sponge was calculated following the literature method . These experiments were repeated three times for each measurement, and the average value was used.…”

Section: Methodsmentioning

confidence: 99%

“…Because oil/water mixtures produced from industries occasionally contain toxic organic compounds and heavy metals, there is an increasing demand for simultaneous oil/water separation and pollutant remediation . Oil/water separators loaded with catalysts decompose toxic organic pollutants in water after oil/water separation is achieved .…”

Section: Introductionmentioning

confidence: 99%

“…Oil/water separators loaded with catalysts decompose toxic organic pollutants in water after oil/water separation is achieved . Other cases include separators with an adsorption function to adsorb heavy metals or toxic organic compounds in water after the oil/water separation . However, to the best of our knowledge, neutralizing a strongly basic solution after oil/water separation has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

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A Potential Amphiprotic Sponge with a Controlled Release Characteristic of Protons on Demand for Oil/Water Separation and Acid/Base Neutralization

Kaang

Lee

Han

et al. 2019

Adv Materials Inter

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Ultralight sponges with the ability to release protons on demand, namely, superhydrophobic melamine formaldehyde sponges (SHpho‐MFSs), which are characterized as being safe‐to‐handle, convenient‐to‐use, easy‐to‐store, easy‐to‐carry, and easy‐to‐collect, are switched from superhydrophilic MFSs (SHphi‐MFSs) by a one‐step ultrasound treatment at a low pH. The wettability of the SHphi‐MFS is completely switched from the outside to the inside of the MFS. After wettability switching is achieved, the SHpho‐MFS that is prewetted with water and oil is able to selectively separate both water and oil, respectively. A compressed SHpho‐MFS also exhibits excellent separation performance of a water‐in‐oil emulsion. Furthermore, since the SHpho‐MFS can linearly release protons in an aqueous solution, during the oil/water separation (water‐removing), an aqueous solution of a strong base is neutralized or changed into a certain solution with a tailored pH by a simple filtration step using an appropriately sized SHpho‐MFS. The SHpho‐MFS can maintain a slow reaction rate and reduce the sudden release of heat during neutralization. Controlled release of the SHpho‐MFS capable of the ordered production of protons on demand is also achieved because the release “on and off” behavior of protons is repeatedly observed for every cycle.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Potential Amphiprotic Sponge with a Controlled Release Characteristic of Protons on Demand for Oil/Water Separation and Acid/Base Neutralization

Kaang

Lee

Han

et al. 2019

Adv Materials Inter

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“…Han et al. prepared superhydrophilic & underwater superoleophobic sponges via soaking into a solution containing polydopamine and octadecylamine . The sponge exhibited an excellent absorption efficiency that reached 100 % from oil/water mixtures due to absorption and squeezing.…”

Section: Removal Of Floating and Underwater Insoluble Organic Liquidsmentioning

confidence: 99%

Removal of Organic Pollutants from Water Using Superwetting Materials

Zhang

Wang

2017

The Chemical Record

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The frequent occurrence of water pollution accidents and the leakage of organic pollutants have caused severe environmental and ecological crisis. It is thus highly imperative to find efficient materials to solve the problem. Inspired by the lotus leaf, superwetting materials are receiving increasing attention in the field of removal of organic pollutants from water. Various superwetting materials have been successfully generated and integrated into devices for removal of organic pollutants from water. On the basis of our previous work in the field, we summarized in this account the progress of removal of (1) floating and underwater insoluble, (2) emulsified insoluble, and (3) both insoluble and soluble organic pollutants from water using superwetting materials including superhydrophobic & superoleophilic materials, superhydrophilic & underwater superoleophobic materials, and materials with controllable wettability. The superwetting materials are in the forms of 2D porous materials, 3D porous materials and particles, etc. Finally, the current state and future challenges in this field are discussed. We hope this account could shed light on the design of novel superwetting materials for efficient removal of organic pollutants from water.

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Improved Device Performance and Stability in Organic Solar Cells by Morphology Control via Size‐Controlled Chevron‐Shaped Blades

Song,

Han,

Kaang

et al. 2023

Solar RRL

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Organic solar cells (OSCs) have been studied widely as renewable energy resources for a few decades owing to their technological advantages, including low cost, light weight, flexibility, and the potential of large area printing. To upgrade the active layers of OSCs into an optimized form, a simple and straightforward strategy is demonstrated by introducing two types of size‐controlled chevron (V)‐shaped blades to delicately control PM6:Y6‐based bulk heterojunction (BHJ) films under ambient conditions. A power conversion efficiency of 15.97% is achieved from the blade‐coating methods using a small‐sized V‐shaped blade (V1), compared with 14.31% using a conventional flat blade (F). Using blade coating based on V1 improves the phase separation and molecular crystallinity in the active layer, which lead to decreased trap‐assisted recombination and leakage current, finally increasing the short circuit current and fill factor. In addition, following these morphological changes in the optimal BHJ structure, the devices printed with V1 exhibit higher stability in the long‐term shelf‐life test (320 h storage in ambient conditions). Notably, strategy is a facile layer fabrication method that adopts V‐shaped blades to achieve high device performance and stability for the practical use of large‐area OSCs.

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Polydopamine-mediated all-in-one device with superhydrophilicity and superhydrophobicity for one-step oil/water separation and pollutant purification

Cited by 22 publications

References 33 publications

A Potential Amphiprotic Sponge with a Controlled Release Characteristic of Protons on Demand for Oil/Water Separation and Acid/Base Neutralization

A Potential Amphiprotic Sponge with a Controlled Release Characteristic of Protons on Demand for Oil/Water Separation and Acid/Base Neutralization

Removal of Organic Pollutants from Water Using Superwetting Materials

Improved Device Performance and Stability in Organic Solar Cells by Morphology Control via Size‐Controlled Chevron‐Shaped Blades

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