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• W3164175859 abstract "A general strategy has been developed here to supramolecular self-assembly of nickel (Ⅱ)-substituted α-Keggin-type polyoxometalate and polyaniline coated Fe 2 O 3 hollow nanospindle (Fe 2 O 3 hollow nanospindle@PANI/α-SiW 11 Ni composites) via electrostatic attraction and hydrothermal method. Fe 3+ was first hydrolyzed and polymerized into Fe 2 O 3 , then dissolved into [Fe(H 2 PO 4 ) x ] 3−x , resulting in hollow structure. The polyoxometalate existed in polyaniline as a proton-doped counter-ion form, rather than as a separate crystalline state. The protons and anions entered the PANI main chain and combined with N atoms of amines and imines on the PANI chain ((-NH ‧+ ​= ​)/α-[SiW 11 Ni(H 2 O)O 39 ] 6- ) to form poles and bipolar delocalization into π bonds of the whole polyaniline molecular chain, which leaded to conductance and polarization. The Fe 2 O 3 hollow nanospindle@PANI/α-SiW 11 Ni composites were proven to be excellent microwave absorber in terms of reflection loss (R L ) and bandwidth. The maximum R L value was up to −53.6 ​dB at 3.5 ​mm and 6.9 ​GHz. The broadest absorption bandwidth exceeding −10 dB was 6.3 ​GHz at a thickness of only 1.9 ​mm. Moreover, the ternary composites presented obvious multi-band absorption with the matching thickness range of 1.5–5 ​mm. The absorption peaks bandwidth reached as wide as 14.3 ​GHz, which included all C-Ku bands. The hollow and core-shell structures could provide non-uniform interface for the induced polarization loss and space for the reflecting and scattering of microwave. The carrier, pair-ion carrier and hydrogen bond network could lead to conduction loss. The magnetic losses were caused by eddy current effect and natural resonance. This work can lay a theoretical foundation for the design and performance regulation of new absorbing materials. • A unique strategy: supramolecular self-assembly of polyoxometalate and polyaniline coated Fe 2 O 3 . • The absorption property of composites showed obvious multi-band absorption. • The microwave absorption mechanism was analyzed in detail." @default.
• W3164175859 created "2021-06-07" @default.
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• W3164175859 date "2021-06-01" @default.
• W3164175859 modified "2023-10-17" @default.
• W3164175859 title "Supramolecular self-assembly of nickel (Ⅱ)-substituted α-Keggin-type polyoxometalate and polyaniline coated Fe2O3 hollow nanospindle for microwave absorption application" @default.
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• W3164175859 doi "https://doi.org/10.1016/j.pnsc.2021.04.007" @default.
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