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    A research group of our university has made a series of progress in the research of dissociation and purification of Pal minerals and their carrier properties
    2021-04-22 | BROWSE TIMES: | Edit:admin

    Recently, Prof.Liu Yin’sresearchgroup has made a series of progress in the dissociation, purification and carrier properties ofPalminerals, and the research results were published in Applied Clay Science, 2021, 200: 105915;2021, 204: 106009 (CAS Zone 1, Top Journal, IF = 4.605 ) and New Journal of Chemistry,BritishRoyal Society of Chemistry, 2021, 45, 2765 (JCR Division: Q2 ; IF = 3.288). Meanwhile, the journal Applied Clay Science introduced the above research resultson its official website.

    Pal is ahydrous magnesium-aluminum silicate clay mineral with a crystal structure of two silica-oxygen tetrahedra interspersed with a layer of magnesium (aluminum)-oxygen (hydrogen-oxygen) octahedra (i.e., 2:1 clay mineral). This special chain-layered crystal structure imparts excellent physicochemical properties to thePalminerals: unique rheological properties, cation exchange capacity, adsorption, and carrier properties. However, naturalPalminerals are accompanied by other derivatives and their rod-like forms tend to aggregate into crystal bundles. Therefore, dissociation and purification of the rawPalmineralis essential for practical applications.

    Pal/Fe3O4, Pal/PANI nanocomposites FESEM photos, microwave absorption properties and mechanism diagrams

    Prof. LiuYin’s group systematically investigated the effects of ratio of grinding media to material on the crystal composition, microscopic morphology and pore structure ofPalusing a conventionalhydro-ball-milling process. The effective dissociation and purification of therod-like crystalline bundles were achieved by a simple mechanical ball milling process, which maintained their intrinsic nanofibrous length-diameter ratio and their specific surface area up to255.03 m2/g. Meanwhile, Pal/Fe3O4 and Pal/PANI nanocomposites were prepared for the first time by hydrothermal and polymerization reactions using the dissociated and purifiedPalas carriers. Due to the good hydrophilicity, cation exchange ability and abundant Si-OH groups on the surface, thePalcarrier can achieve directional induction, which can effectively improve the agglomeration of Fe3O4 magnetic particles and polyaniline (PANI) particles. Compared with theperformance of Fe3O4 and PANI, the prepared Pal/Fe3O4 and Pal/PANI nanocomposites have significantly enhanced microwave absorption performance.

    Based on the above study, coral-like Pal/Fe3O4/PANI ternary composites were further prepared. The rich interfacial polarization, relaxation process and improved impedance matching due to the synergistic effect of PANI and Fe3O4 make the Pal/Fe3O4/PANI ternary complex with an RLmin of -62.45 dB at 7.04 GHz and its effective absorption bandwidth can be as high as 5.05 GHz.

    Schematic diagram of the synthesis process of coral-like Pal/Fe3O4/PANI ternary composites

    Schematic diagram of the electromagnetic loss mechanism of coral-like Pal/Fe3O4/PANI ternary composites

    The above work provides new ideas for the dissociation and purification ofPalminerals and their function development and application. Wang Sheng and Ren Hengdong(Grade 2018),master’s degree candidatesatthe School of Materials, are the first authors ofthethree papers respectively, and Professor Liu Yin is the corresponding author of the papers.

    Theresearchis supported by the academic funding program for top talents(discipline/major)ofuniversities in Anhuiand the major special projects of science and technology in Anhui.

    Written byZhu Hongzheng

    Reviewed byZhang Yong

    Edited by Xia Yafeng

    Approved by Ruan Jinhua

    Translated by Wang Yijun

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