Dispersed spherical shell-shaped palygorskite/carbon/polyaniline composites with advanced microwave absorption performances

Wang, Sheng; Ren, Hengdong; Lian, Wei; Zhang, Ximing; Liu, Zhenying; Liu, Yin; Kong, Ling Bing; Bai, Hongcun

doi:10.1016/j.powtec.2021.04.028

Cited by 22 publications

(8 citation statements)

References 59 publications

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“…It's notable that the phenomenon is typical frequency dispersion behavior and is usually found in carbon-based microwave absorption material. 35 As shown in Fig. 8(e), the m 00 value presents a decreasing trend with moderate uctuations, the value ranging from 0.68 to 0.05 and 0.5 to À0.02, respectively.…”

Section: Microwave Absorption Propertiesmentioning

confidence: 71%

Synthesis of hollow core–shell ZnFe₂O₄@C nanospheres with excellent microwave absorption properties

Hao

Wang

et al. 2022

RSC Adv.

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Section: Microwave Absorption Propertiesmentioning

confidence: 71%

Synthesis of hollow core–shell ZnFe₂O₄@C nanospheres with excellent microwave absorption properties

Hao

Wang

et al. 2022

RSC Adv.

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“…The absorption bands at 1121 and 1300 cm –1 are attributed to the C–OH and C–N stretching vibrations. The FTIR spectra indicated the successful incorporation of PANI into the Co/C nanocomposites …”

Section: Resultsmentioning

confidence: 99%

“…17 With the addition of PANI to the Co/C composite, several new absorption peaks appeared in the FTIR spectra. For example, the C=C stretching vibration of the benzene ring of PANI triggered an absorption peak at 1437 16 The XPS spectra of Co/C@PANI nanocomposites are shown in Figure 1c−f. The survey spectrum shows that the main elements in the composites are C, O, N, and Co, with contents of approximately 81.02, 12.00, 6.88, and 0.10%, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Polyaniline-Coated ZIF-67-Derived Co/C Nanostructures for Efficient Electromagnetic Wave Absorption

Xian

Zhang

Zhu

et al. 2023

ACS Appl. Nano Mater.

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Metal–organic frameworks (MOFs) have diverse structures, thus sparking strong research interest in the field of electromagnetic wave (EMW) absorption. In this work, zeolitic imidazolate framework-67 (ZIF-67) was hydrothermally synthesized and thermally annealed to form rhombic dodecahedral Co/C nanocomposites with desirable porous structures. Then, a layer of rod-shaped polyaniline was coated on the surface of the Co/C nanocomposites through in situ polymerization. The effect of the mass ratio of polyaniline to Co/C on the electromagnetic properties of the nanocomposites was studied. The sample Co/C@PANI-2 exhibited an optimal reflection loss of −67.67 dB and an effective absorption bandwidth of 5.02 GHz at a filling ratio of 50%. The rod-like polyaniline coating effectively enhanced the electromagnetic properties and impedance matching of the nanocomposites. This work provides a reference for the composite of MOF-derived nanomaterials and conducting polymers in EMW absorption studies.

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“…Nanoparticles can improve the apparent solubility of poorly soluble substances, but naked nanoparticles readily self‐aggregate 22, 23 . Currently, direct chemical modification or coating additives and carriers onto nano‐sized particles can prevent aggregation, 24, 25 and the latter method is used most frequently. In this study, the critical micelle concentration of emulsifier 600 is 19 mg L −1 , that of emulsifier 700 is 113 mg L −1 and that of SDS is 811 mg L −1 (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

Nano‐EMB‐SP improves the solubility, foliar affinity, photostability and bioactivity of emamectin benzoate

Gao

Cui

Wang

et al. 2022

Pest Management Science

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BACKGROUND: Emamectin benzoate (EMB), a frequently used biopesticide, is poorly soluble in water, making it difficult to wet the leaf surface, is prone to degrade in sunlight and readily loses its bioactivity. Traditional methods such as organic solvent application, pH adjustment and addition of photoprotectants either increase the economic and environmental costs or barely achieve the desired goal. We hypothesized that nanotechnology could improve the solubility, foliar affinity, photostability and bioactivity of EMB. This research set out to prepare a nano-EMB solid powder (nano-EMB-SP) and test this hypothesis.RESULTS: Nano-EMB-SP was prepared using a self-emulsifying method combined with carrier solidification. The mean particle size and Polydispersity index (PDI) of nano-EMB-SP were 14.64 nm and 0.24, respectively. A scanning electron microscopy image showed that EMB nanoparticles were mainly spherical or ellipsoidal in shape. Without organic solvent, the aqueous solubility of EMB in nano-EMB-SP was 4500 mg L −1 , at least 14-fold that of the EMB soluble granule (EMB-SG), which is solubilized by pH adjustment. Excellent foliar affinity of EMB was achieved by nano-EMB-SP, which completely wet and penetrated the superhydrophobic surface of cabbage (Brassica oleracea L.) leaf. Without photoprotectants, up to 82% of EMB content can be protected from ultraviolet (UV) damage in nano-EMB-SP. The combined effects of excellent photostability and foliar affinity of nano-EMB-SP led to the bioactivity of EMB being almost unchanged before and after UV radiation.CONCLUSION: Nano-EMB-SP is an eco-friendly and efficient way to improve the solubility, foliar affinity, photostability and bioactivity of EMB. This research provides a good approach to improving the efficacy of poorly soluble and UV-sensitive pesticides.

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Dispersed spherical shell-shaped palygorskite/carbon/polyaniline composites with advanced microwave absorption performances

Cited by 22 publications

References 59 publications

Synthesis of hollow core–shell ZnFe₂O₄@C nanospheres with excellent microwave absorption properties

Synthesis of hollow core–shell ZnFe₂O₄@C nanospheres with excellent microwave absorption properties

Polyaniline-Coated ZIF-67-Derived Co/C Nanostructures for Efficient Electromagnetic Wave Absorption

Nano‐EMB‐SP improves the solubility, foliar affinity, photostability and bioactivity of emamectin benzoate

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Dispersed spherical shell-shaped palygorskite/carbon/polyaniline composites with advanced microwave absorption performances

Cited by 22 publications

References 59 publications

Synthesis of hollow core–shell ZnFe2O4@C nanospheres with excellent microwave absorption properties

Synthesis of hollow core–shell ZnFe2O4@C nanospheres with excellent microwave absorption properties

Polyaniline-Coated ZIF-67-Derived Co/C Nanostructures for Efficient Electromagnetic Wave Absorption

Nano‐EMB‐SP improves the solubility, foliar affinity, photostability and bioactivity of emamectin benzoate

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Synthesis of hollow core–shell ZnFe₂O₄@C nanospheres with excellent microwave absorption properties

Synthesis of hollow core–shell ZnFe₂O₄@C nanospheres with excellent microwave absorption properties