Asymmetrical Exchange of Monomers for Constructing Hollow Nanoparticles and Antifragile Monoliths

Wang, Song; Zhang, Chi; Zhang, Ziyang; Yang, Yuhao; Li, Qiulin; Wang, Wenjun; Li, Bo‐Geng; Liu, Pingwei

doi:10.1016/j.matt.2020.12.001

Cited by 26 publications

(36 citation statements)

References 58 publications

(67 reference statements)

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“…These observed peaks are associated with the (110), (210), (210), and (001) planes, respectively. [ 21 ] Besides, Pd@COF‐TB exhibited an XRD spectrum similar to that of the COF‐TB. Meanwhile, a peak characteristic of Pd(II) reflection was observed at 40°, indicating the successful introduction of Pd(II).…”

Section: Resultsmentioning

confidence: 91%

“…The COF‐TB in Figure 1 had been synthesized and characterized in detail by Wang et al [ 21 ] And we got some COF‐TB from their group to synthesize the Pd@COF‐TB catalyst by introducing Pd(OAc) 2 into the COF‐TB. [ 11 ] Then, the prepared Pd@COF‐TB catalyst was characterized by Fourier transform infrared (FT‐IR), X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectrometry (EDS), X‐ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET), and the palladium content in the Pd@COF‐TB was determined to be 4.7 wt % by inductively coupled plasma atomic emission spectrometry (ICP‐AES).…”

Section: Resultsmentioning

confidence: 99%

“…The peak at 1624.80 cm −1 was attributed to the C═N stretching vibration, indicating the existence of the Schiff base functional group. [ 21 ] The sharp peak at 1139.53 cm −1 belongs to the bending vibration of the benzene ring. The FT‐IR absorption spectrum of the Pd@COF‐TB catalyst was similar to the COF‐TB, which means the structure of COF‐TB still remained stable after Pd(II) was loaded on COF‐TB.…”

Section: Resultsmentioning

confidence: 99%

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Covalent organic framework‐supported Pd nanoparticles: An efficient and reusable heterogeneous catalyst for Suzuki–Miyaura coupling reactions

Jin

Zhang

Liu

et al. 2022

Applied Organom Chemis

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Covalent organic framework‐supported Pd nanoparticles: An efficient and reusable heterogeneous catalyst for Suzuki–Miyaura coupling reactions

Jin

Zhang

Liu

et al. 2022

Applied Organom Chemis

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“…We propose to achieve hierarchical control of self-assembly of 2D polymers by coordinately regulating the polymerization of 2D COF monomers with short-range interactions and the assembly of polymerized substances with medium- and long-range interactions. Methodologically, two monofunctional competitors were introduced in the polycondensation of multifunctional monomers to enhance the reaction’s reversibility and the system’s capability of correcting monomer-linking errors. ,, The employment of competitors have been used for reaction and morphology control of metal–organic frameworks (MOFs) , and recently COFs, ,,, , the reversible polycondensation-termination (RPT) method for example. We next selected two twisty monomers for weakening interactions between the generated polymer molecules/nanocrystals and reducing their stacking disorders (Figure A).…”

Section: Resultsmentioning

confidence: 99%

Toward Covalent Organic Framework Metastructures

et al. 2021

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The bottom-up assembly of periodically ordered structures provides a scalable way for producing metastructured materials with exotic optical and mechanical properties. However, direct self-assembly of small molecules into such metastructures beyond the nanoscale remains an unresolved issue. Here we demonstrate that metastructured assemblies of two-dimensional (2D) polymers, specifically 2D covalent organic frameworks (COFs), can be directly synthesized in solution. We applied 2D COF monomer polycondensation to prepare flower-shaped particles consisting of highly crystalline "petals" with sizes larger than 20 μm. The petal comprises periodically arranged COF nanoflake units with tunable lengths of 490−850 nm, thicknesses about 20 nm, interflake spacing around 14 nm, and Hermans orientation factors up to 0.998. Such a metastructure is mechanically robust and remains almost intact even after full pyrolysis at 900 °C. It also demonstrates unique birefringence and polarization-dependent resonances under visible−near-infrared light not observed in its constituents, 2D COF polycrystals, and with well-defined nanopores of 1.8 nm and the high surface area of 1576 m 2 /g. Such metastructured particles with nanopores are well-suited as novel particulate optical devices for collecting and storing information about their surroundings that can be easily read out by polarization imaging with high sensitivity, as demonstrated by their explosive detection and anticounterfeiting applications. Self-assembly of 2D polymers into metastructures may become an important method for developing functional materials with unprecedented properties and extensive applications.

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“…Recently, we developed a reversible polycondensation–termination (RPT) method that provides remarkable control for the growth and decomposition of COF species, leading to the synthesis of core–shell, yolk–shell, and hollow nanostructures . However, the control assembly of 2D COFs to preserve such well-defined structures beyond nanoscale, e.g., microcapsules, remains elusive.…”

mentioning

confidence: 99%

Hierarchical Assembly of Two-Dimensional Polymers into Colloidosomes and Microcapsules

et al. 2021

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Hierarchical assembly of two-dimensional (2D) polymers to 3D microstructures provides new means of creating functional materials with exotic properties for extensive applications. Herein, we report an approach of assembling 2D covalent organic framework (COF) colloidosomes or microcapsules from small molecules. We polymerized monomers to produce narrowly distributed COF particles with average particle sizes greater than 490 nm, which were further used as stabilizers to prepare various water-in-oil Pickering emulsions with droplet sizes of 10–120 μm on average. The emulsion droplets were subsequently applied as templates for interfacial polymerization of the same monomers. The COF microcapsules with varied diameters and shell thicknesses of 0.2–3.1 μm were thus obtained, which possessed good stability, high crystallinity, and surface areas no less than 540 m2/g. The approach also permits facile loading of water-soluble substances such as salts, dyes, or proteins. The loaded molecules demonstrated different permeability against the shell, in which 98% of the encapsulated salts could be released in 1 h while only 18% of dye molecules and almost none of the fluorescent proteins diffused out from the microcapsules. Such an assembling approach may greatly extend the applications of 2D polymers and their microcapsules.

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Asymmetrical Exchange of Monomers for Constructing Hollow Nanoparticles and Antifragile Monoliths

Cited by 26 publications

References 58 publications

Covalent organic framework‐supported Pd nanoparticles: An efficient and reusable heterogeneous catalyst for Suzuki–Miyaura coupling reactions

Covalent organic framework‐supported Pd nanoparticles: An efficient and reusable heterogeneous catalyst for Suzuki–Miyaura coupling reactions

Toward Covalent Organic Framework Metastructures

Hierarchical Assembly of Two-Dimensional Polymers into Colloidosomes and Microcapsules

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