Table-salt enabled interface-confined synthesis of covalent organic framework (COF) nanosheets

Shi, Xiansong; Ma, Dongwei; Xu, Fang; Zhang, Zhe; Wang, Yong

doi:10.1039/c9sc05082e

Cited by 65 publications

(56 citation statements)

References 53 publications

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“…For instance, Shi et al prepared a series of imine-linked COFs through the interface confined growth of the nanosheets on the surface of table salt crystals. 89 For the three materials they grew, nano-sheets with thicknesses of 3.2–4.8 nm and large lateral extensions of 1–4 μm were obtained. Ma and co-workers showed the interfacial growth of an imine based COF at a liquid–liquid interface.…”

Section: Methodsmentioning

confidence: 99%

2D framework materials for energy applications

et al. 2021

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Section: Methodsmentioning

confidence: 99%

2D framework materials for energy applications

et al. 2021

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“…4.2.4 Interfacial synthesis. Diffusion-based COF synthesis at the solid-liquid, 225 liquid-liquid, [226][227][228] or liquid-gas 229 interfaces usually yields nanosheets or thin lms. Although the thickness can be controlled to a few nanometers or a dozen nanometers, the length and width are usually in the range of several microns.…”

Section: Bottom-up Synthesismentioning

confidence: 99%

Nanoscale covalent organic frameworks as theranostic platforms for oncotherapy: synthesis, functionalization, and applications

et al. 2020

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“…Single-layer modification includes interface-confined modification, spraying, vapor deposition, photoetching, photografting, photodegradation, and so on. In the process of Janus membrane preparation, interfacial-confined modification [88] is a preparation method which separates the two surfaces of the membrane in different phases and modifies the surface separately. Yang et al used interface-confined surface engineering to modify the hydrophilic cotton fabric membrane, making its one side hydrophobic, as shown in Figure 9a.…”

Section: Single-layermodificationmentioning

confidence: 99%

Section: Design and Fabricationmentioning

confidence: 99%

Janus Membranes with Asymmetric Wettability Applied in Oil/Water Emulsion Separations

Zhang

Sun

Guo

et al. 2021

Advanced Sustainable Systems

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but these separation methods have the disadvantages of low separation efficiency, high energy consumption, complicated operation, and so on. [8] In order to solve these problems, a variety of original oil-water separation methods emerged, which usually separate oil/water mixtures by filtration and absorption. The materials for separating oil/water mixtures by filtration principle include meshes, [9,10] membranes, [11,12] filters, [13,14] film, [15,16] and so on; the materials for separating oil/water mixtures by absorption are porous materials, [17,18] powders/particles, [19,20] gels, [21,22] nanocomposites, [23,24] and so on. [3] The oil/water mixture can be divided into three categories according to the diameter size: free oil: the diameter of droplet is greater than 150 µm; dispersed oil: the diameter of droplet is less than 150 µm and greater than 20 µm; emulsified oil: the diameter of droplet is less than 20 µm. [25][26][27][28][29][30] Among them, emulsions consisting of micro-/nanoscale dispersed droplets within a continuous phase are the most difficult to separate, and the general oil/water separation method cannot effectively separate them. [31][32][33][34][35] Traditional separation methods of oil/water emulsion include thermal/chemical demulsification separation, electrochemical demulsification, centrifugation, etc. [36] However, these separation methods not only have complex operation, low separation efficiency, but also may cause secondary pollution. [4] The separation of oil/water emulsion also adopts the principle of filtration and absorption. [3] When oil/water emulsions are separated by absorption, materials with a 3D structure are often used to separate them, for example, Chen et al. [37] prepared 3D superhydrophobic foams by in situ pretreated by noncovalent surface decoration of plant polyphenol-glutaraldehyde cross-linkage that were pretreated by noncovalent surface decoration of plant polyphenolglutaraldehyde cross-linkage. Although this separation method is effective and does not clog the membrane, it cannot be reused for many times, which increases the cost. When the oil/water emulsion is separated through filtration, demulsification is usually used. Demulsification refers to the reduction of emulsion stability, resulting in immiscible phase separation, including chemical, biological, and physical treatment methods, which are commonly used in membrane separation demulsification methods including size sieving effect, charge-screening effect, With frequent oil spill accidents and the large amount of oily wastewater produced in various industrial and domestic processes, the separation of emulsified oil/water mixtures has become an important topic in environmental protection. Janus membranes with asymmetric wettability stand out among many separation materials for their switchable separation, high separation efficiency, low energy consumption, good repeatability, and durability. In recent years, Janus membranes have developed rapidly, but their separation principles and advantages and disadvan...

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Table-salt enabled interface-confined synthesis of covalent organic framework (COF) nanosheets

Abstract: We present an exfoliation-free and scalable strategy to prepare few-layered CONs by the interface-confined synthesis. The resultant CONs are assembled into selective layers for molecular separations.

Cited by 65 publications

References 53 publications

2D framework materials for energy applications

2D framework materials for energy applications

Nanoscale covalent organic frameworks as theranostic platforms for oncotherapy: synthesis, functionalization, and applications

Janus Membranes with Asymmetric Wettability Applied in Oil/Water Emulsion Separations

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