Wettability Improvement in Oil–Water Separation by Nano-Pillar ZnO Texturing

Liu, Xiaoyan; Feng, Shuai; Wang, Caihua; Yan, Dayun; Chen, Lei; Bao, Wan-Su

doi:10.3390/nano12050740

Cited by 5 publications

(2 citation statements)

References 44 publications

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“…Adhesion is the result of molecular or atomic forces between objects, causing them to bond closely [79]. This phenomenon involves various mechanisms of adhesion, among which van der Waals forces generate short-range attractions between molecules, including London dispersion forces and Debye polarization forces, creating temporary charge distributions and resulting in attraction [48,80,81].…”

Section: Mechanism and Failure Modementioning

confidence: 99%

Nanostructure-Based Oil–Water Separation: Mechanism and Status

Wang,

Feng,

Wang

et al. 2023

Separations

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Flexible and effective methods for oil–water separation are crucial for reducing pollutant emissions and safeguarding water and fuel resources. In recent years, there has been growing interest in fundamental research and engineering applications related to water and fuel purification, especially oil–water separation. To date, filter materials with special wetting characteristics have been widely used in oil–water separation. Nanostructured materials are one of the most attractive candidates for next-generation oil–water separation. This review systematically summarizes the mechanisms and current status of oil–water separation using nanostructured materials. Basically, this can be achieved by using nanostructured materials with specific wettability and nanostructures. Here, we provide a detailed discussion of two general approaches and their filtration mechanisms: (1) the selective filtration technique, based on specific surface wettability, which allows only oil or water to penetrate while blocking impurities; (2) the absorption technique, employing porous sponges, fibers, or aerogels, which selectively absorbs impure oil or water droplets. Furthermore, the main failure modes are discussed in this review. The purposes of this article are: (1) to summarize the methods of oil–water separation by nanotechnology; (2) to raise the level of environmental protection consciousness of water pollution by using nanotechnology; (3) to tease out the features of different approaches and provide a pivotal theoretical basis to optimize the performance of filtering materials. Several approaches for oil and water separation are compared. Furthermore, the principle and application scope of each method are introduced.

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Section: Mechanism and Failure Modementioning

confidence: 99%

Nanostructure-Based Oil–Water Separation: Mechanism and Status

Wang,

Feng,

Wang

et al. 2023

Separations

Self Cite

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show abstract

“…Designing a surface with special wettability is an important approach to improving the separation efficiency of oil and water. Liu and co-authors demonstrated superhydrophobicity in both oil and water from their stainless-steel metal fibers coated with sol–gel-derived ZnO nano-pillars [ 8 ]. They found that their ZnO-coated stainless-steel metal fibers had a static underwater oil contact angle of 151.4° ± 0.8° and an underoil water contact angle of 152.7° ± 0.6° and was a highly promising candidate for both water-in-oil and oil-in-water separation in the industry.…”

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confidence: 99%